Replace navigation_and_routing with a new sample (#832)

* move snippets into old_snippets directory

* add new navigation_and_routing sample

* add copyright headers

* Apply #827 to old_snippets/ directory and upgrade them to null safety

* Code review comments

- Move Guard class into parser.dart
- Move usage of guards from Delegate to RouteInformationParser
- Rename delegate to SimpleRouterDelegate

* clean up imports

* refactor settings screen, fix bug

* avoid conflicting paths /books/new and /books/1 - rename to book/1

* dispose fields in _BookstoreState class

* remove /books path

This was causing problems

* add comment

* Change BookstoreAuthScope and BookstoreAuthScope to InheritedNotifier

* fix warnings

* Make the initial route configurable, set to '/signin'

* Enable deep linking

https://flutter.dev/docs/development/ui/navigation/deep-linking

* use path URL strategy on the web.

* remove TODO, add comment

navigation_and_routing/.gitignore

@@ -39,3 +39,8 @@ app.*.symbols
 
 # Obfuscation related
 app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

navigation_and_routing/.metadata

@@ -4,7 +4,7 @@
 # This file should be version controlled and should not be manually edited.
 
 version:
-  revision: 1aafb3a8b9b0c36241c5f5b34ee914770f015818
+  revision: 02c026b03cd31dd3f867e5faeb7e104cce174c5f
   channel: stable
 
 project_type: app

navigation_and_routing/README.md

@@ -1,47 +1,5 @@
-# Navigation and Routing sample code
+# bookstore
 
-Sample code for [Learning Flutter's New Navigation and Routing System][article],
+This sample shows how to set up a Router using a custom RouterDelegate and
-an article explaining the Router widget and its associated classes.
+RouteInformationParser.
 
-## Samples
-
-**Navigator samples**
-
-* [navigator/anonymous_routes.dart](lib/navigator/anonymous_routes.dart) -
-  Shows how to use a Navigator to push and pop anonymous routes (e.g.
-  MaterialPageRoute)
-* [navigator/named_routes.dart](lib/navigator/named_routes.dart) - Shows
-  how to use define named routes via the `routes` parameter on MaterialApp, and
-  navigate using Navigator.pushNamed
-* [navigator/on_generate_route.dart](lib/navigator/on_generate_route.dart) -
-  Shows how to handle arbitrary named routes using the `onGenerateRoute`
-  callback defined in the `MaterialApp` constructor.
-
-**Router samples**
-
-* [router/pages.dart](lib/router/pages.dart) - Shows how to define a list of
-  [Page] objects on Navigator declaratively.
-* [router/router.dart](lib/router/router.dart) - Full sample that shows a custom
-  RouteInformationParser and RouterDelegate parsing named routes and
-  declaratively building the stack of pages for the Navigator.
-
-**Advanced**
-
-* [router_advanced/nested_router.dart](lib/router_advanced/nested_router.dart) -
-  Shows two [RouterDelegate], one nested within the other. A
-  [BottomNavigationBar] can be used to select the route of the outer
-  RouterDelegate, and additional routes can be pushed onto the inner
-  RouterDelegate / Navigator.
-* [router_advanced/transition_delegate.dart](lib/router_advanced/transition_delegate.dart)
-  Shows how a custom TransitionDelegate can be used to customize when
-  transition animations are shown.
-
-## Running
-
-Each file in this project is an entrypoint. To run, specify the filename of
-the sample:
-
-```bash
-flutter run lib/router/router.dart
-```
-[article]: https://medium.com/flutter/learning-flutters-new-navigation-and-routing-system-7c9068155ade

navigation_and_routing/analysis_options.yaml

@@ -0,0 +1,19 @@
+include: package:flutter_lints/flutter.yaml
+
+analyzer:
+  strong-mode:
+    implicit-casts: false
+    implicit-dynamic: false
+
+linter:
+  rules:
+    avoid_types_on_closure_parameters: true
+    avoid_void_async: true
+    cancel_subscriptions: true
+    close_sinks: true
+    directives_ordering: true
+    package_api_docs: true
+    package_prefixed_library_names: true
+    test_types_in_equals: true
+    throw_in_finally: true
+    unnecessary_statements: true

navigation_and_routing/android/app/build.gradle

@@ -26,21 +26,17 @@ apply plugin: 'kotlin-android'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
     }
 
-    lintOptions {
-        disable 'InvalidPackage'
-    }
-
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
-        applicationId "com.example.navigation_and_routing"
+        applicationId "dev.flutter.bookstore"
         minSdkVersion 16
-        targetSdkVersion 29
+        targetSdkVersion 30
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }

navigation_and_routing/android/app/src/debug/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.navigation_and_routing">
+    package="dev.flutter.bookstore">
     <!-- Flutter needs it to communicate with the running application
          to allow setting breakpoints, to provide hot reload, etc.
     -->

navigation_and_routing/android/app/src/main/AndroidManifest.xml

@@ -1,13 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.navigation_and_routing">
+    package="dev.flutter.bookstore">
-    <!-- io.flutter.app.FlutterApplication is an android.app.Application that
+   <application
-         calls FlutterMain.startInitialization(this); in its onCreate method.
+        android:label="bookstore"
-         In most cases you can leave this as-is, but you if you want to provide
-         additional functionality it is fine to subclass or reimplement
-         FlutterApplication and put your custom class here. -->
-    <application
-        android:name="io.flutter.app.FlutterApplication"
-        android:label="navigation_and_routing"
         android:icon="@mipmap/ic_launcher">
         <activity
             android:name=".MainActivity"
@@ -37,6 +31,16 @@
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
+
+            <!-- Deep linking -->
+            <meta-data android:name="flutter_deeplinking_enabled" android:value="true" />
+            <intent-filter android:autoVerify="true">
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="http" android:host="flutterbooksample.com" />
+                <data android:scheme="https" />
+            </intent-filter>
         </activity>
         <!-- Don't delete the meta-data below.
              This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->

navigation_and_routing/android/app/src/main/kotlin/dev/flutter/bookstore/MainActivity.kt

@@ -1,4 +1,4 @@
-package com.example.navigation_and_routing
+package dev.flutter.bookstore
 
 import io.flutter.embedding.android.FlutterActivity
 

navigation_and_routing/android/app/src/main/res/drawable-v21/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

navigation_and_routing/android/app/src/main/res/values-night/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             Flutter draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+         
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

navigation_and_routing/android/app/src/main/res/values/styles.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <!-- Theme applied to the Android Window while the process is starting -->
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
-    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
         <!-- Show a splash screen on the activity. Automatically removed when
              Flutter draws its first frame -->
         <item name="android:windowBackground">@drawable/launch_background</item>
@@ -12,7 +12,7 @@
          running.
          
          This Theme is only used starting with V2 of Flutter's Android embedding. -->
-    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
-        <item name="android:windowBackground">@android:color/white</item>
+        <item name="android:windowBackground">?android:colorBackground</item>
     </style>
 </resources>

navigation_and_routing/android/app/src/profile/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.navigation_and_routing">
+    package="dev.flutter.bookstore">
     <!-- Flutter needs it to communicate with the running application
          to allow setting breakpoints, to provide hot reload, etc.
     -->

navigation_and_routing/android/build.gradle

@@ -6,7 +6,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.0'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
@@ -21,8 +21,6 @@ allprojects {
 rootProject.buildDir = '../build'
 subprojects {
     project.buildDir = "${rootProject.buildDir}/${project.name}"
-}
-subprojects {
     project.evaluationDependsOn(':app')
 }
 

navigation_and_routing/android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip

navigation_and_routing/ios/.gitignore

@@ -18,6 +18,7 @@ Flutter/App.framework
 Flutter/Flutter.framework
 Flutter/Flutter.podspec
 Flutter/Generated.xcconfig
+Flutter/ephemeral/
 Flutter/app.flx
 Flutter/app.zip
 Flutter/flutter_assets/

navigation_and_routing/ios/Flutter/AppFrameworkInfo.plist

@@ -3,7 +3,7 @@
 <plist version="1.0">
 <dict>
   <key>CFBundleDevelopmentRegion</key>
-  <string>$(DEVELOPMENT_LANGUAGE)</string>
+  <string>en</string>
   <key>CFBundleExecutable</key>
   <string>App</string>
   <key>CFBundleIdentifier</key>

navigation_and_routing/ios/Flutter/Debug.xcconfig

@@ -1 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
 #include "Generated.xcconfig"

navigation_and_routing/ios/Flutter/Release.xcconfig

@@ -1 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
 #include "Generated.xcconfig"

navigation_and_routing/ios/Podfile

@@ -0,0 +1,41 @@
+# Uncomment this line to define a global platform for your project
+# platform :ios, '9.0'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
+  end
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_ios_podfile_setup
+
+target 'Runner' do
+  use_frameworks!
+  use_modular_headers!
+
+  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_ios_build_settings(target)
+  end
+end

navigation_and_routing/ios/Podfile.lock

@@ -0,0 +1,22 @@
+PODS:
+  - Flutter (1.0.0)
+  - url_launcher (0.0.1):
+    - Flutter
+
+DEPENDENCIES:
+  - Flutter (from `Flutter`)
+  - url_launcher (from `.symlinks/plugins/url_launcher/ios`)
+
+EXTERNAL SOURCES:
+  Flutter:
+    :path: Flutter
+  url_launcher:
+    :path: ".symlinks/plugins/url_launcher/ios"
+
+SPEC CHECKSUMS:
+  Flutter: 434fef37c0980e73bb6479ef766c45957d4b510c
+  url_launcher: 6fef411d543ceb26efce54b05a0a40bfd74cbbef
+
+PODFILE CHECKSUM: aafe91acc616949ddb318b77800a7f51bffa2a4c
+
+COCOAPODS: 1.10.1

navigation_and_routing/ios/Runner.xcodeproj/project.pbxproj

@@ -8,6 +8,7 @@
 
 /* Begin PBXBuildFile section */
 		1498D2341E8E89220040F4C2 /* GeneratedPluginRegistrant.m in Sources */ = {isa = PBXBuildFile; fileRef = 1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */; };
+		163107DCA98CF5408A42DD8A /* Pods_Runner.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 0AE3A8CEB94AABB517354DA1 /* Pods_Runner.framework */; };
 		3B3967161E833CAA004F5970 /* AppFrameworkInfo.plist in Resources */ = {isa = PBXBuildFile; fileRef = 3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */; };
 		74858FAF1ED2DC5600515810 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 74858FAE1ED2DC5600515810 /* AppDelegate.swift */; };
 		97C146FC1CF9000F007C117D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
@@ -29,12 +30,16 @@
 /* End PBXCopyFilesBuildPhase section */
 
 /* Begin PBXFileReference section */
+		0AE3A8CEB94AABB517354DA1 /* Pods_Runner.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_Runner.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
 		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
 		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
+		49D7EF814BF5A0D3E798ADAE /* Pods-Runner.profile.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.profile.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig"; sourceTree = "<group>"; };
+		71C70971C603166B5757B8AC /* Pods-Runner.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.debug.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"; sourceTree = "<group>"; };
 		74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "Runner-Bridging-Header.h"; sourceTree = "<group>"; };
 		74858FAE1ED2DC5600515810 /* AppDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
+		9682F7751FBA2903F6CCD179 /* Pods-Runner.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.release.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"; sourceTree = "<group>"; };
 		9740EEB21CF90195004384FC /* Debug.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Debug.xcconfig; path = Flutter/Debug.xcconfig; sourceTree = "<group>"; };
 		9740EEB31CF90195004384FC /* Generated.xcconfig */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.xcconfig; name = Generated.xcconfig; path = Flutter/Generated.xcconfig; sourceTree = "<group>"; };
 		97C146EE1CF9000F007C117D /* Runner.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Runner.app; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -49,12 +54,24 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				163107DCA98CF5408A42DD8A /* Pods_Runner.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		7B81C16A03A3AB694F08AD07 /* Pods */ = {
+			isa = PBXGroup;
+			children = (
+				71C70971C603166B5757B8AC /* Pods-Runner.debug.xcconfig */,
+				9682F7751FBA2903F6CCD179 /* Pods-Runner.release.xcconfig */,
+				49D7EF814BF5A0D3E798ADAE /* Pods-Runner.profile.xcconfig */,
+			);
+			name = Pods;
+			path = Pods;
+			sourceTree = "<group>";
+		};
 		9740EEB11CF90186004384FC /* Flutter */ = {
 			isa = PBXGroup;
 			children = (
@@ -72,6 +89,8 @@
 				9740EEB11CF90186004384FC /* Flutter */,
 				97C146F01CF9000F007C117D /* Runner */,
 				97C146EF1CF9000F007C117D /* Products */,
+				7B81C16A03A3AB694F08AD07 /* Pods */,
+				DCFFB20C3B2B4F4DCC6CF244 /* Frameworks */,
 			);
 			sourceTree = "<group>";
 		};
@@ -98,6 +117,14 @@
 			path = Runner;
 			sourceTree = "<group>";
 		};
+		DCFFB20C3B2B4F4DCC6CF244 /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+				0AE3A8CEB94AABB517354DA1 /* Pods_Runner.framework */,
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -105,12 +132,14 @@
 			isa = PBXNativeTarget;
 			buildConfigurationList = 97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */;
 			buildPhases = (
+				E223DFBBAC6A945FFD0847A4 /* [CP] Check Pods Manifest.lock */,
 				9740EEB61CF901F6004384FC /* Run Script */,
 				97C146EA1CF9000F007C117D /* Sources */,
 				97C146EB1CF9000F007C117D /* Frameworks */,
 				97C146EC1CF9000F007C117D /* Resources */,
 				9705A1C41CF9048500538489 /* Embed Frameworks */,
 				3B06AD1E1E4923F5004D2608 /* Thin Binary */,
+				766B88730AAF26F1ADAF797C /* [CP] Embed Pods Frameworks */,
 			);
 			buildRules = (
 			);
@@ -183,6 +212,23 @@
 			shellPath = /bin/sh;
 			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" embed_and_thin";
 		};
+		766B88730AAF26F1ADAF797C /* [CP] Embed Pods Frameworks */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks-${CONFIGURATION}-input-files.xcfilelist",
+			);
+			name = "[CP] Embed Pods Frameworks";
+			outputFileListPaths = (
+				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks-${CONFIGURATION}-output-files.xcfilelist",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh\"\n";
+			showEnvVarsInLog = 0;
+		};
 		9740EEB61CF901F6004384FC /* Run Script */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;
@@ -197,6 +243,28 @@
 			shellPath = /bin/sh;
 			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" build";
 		};
+		E223DFBBAC6A945FFD0847A4 /* [CP] Check Pods Manifest.lock */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
+			);
+			name = "[CP] Check Pods Manifest.lock";
+			outputFileListPaths = (
+			);
+			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-Runner-checkManifestLockResult.txt",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
+			showEnvVarsInLog = 0;
+		};
 /* End PBXShellScriptBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */
@@ -289,17 +357,9 @@
 				CLANG_ENABLE_MODULES = YES;
 				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
 				ENABLE_BITCODE = NO;
-				FRAMEWORK_SEARCH_PATHS = (
-					"$(inherited)",
-					"$(PROJECT_DIR)/Flutter",
-				);
 				INFOPLIST_FILE = Runner/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
-				LIBRARY_SEARCH_PATHS = (
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.bookstore;
-					"$(inherited)",
-					"$(PROJECT_DIR)/Flutter",
-				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.example.navigationAndRouting;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
 				SWIFT_VERSION = 5.0;
@@ -421,17 +481,9 @@
 				CLANG_ENABLE_MODULES = YES;
 				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
 				ENABLE_BITCODE = NO;
-				FRAMEWORK_SEARCH_PATHS = (
-					"$(inherited)",
-					"$(PROJECT_DIR)/Flutter",
-				);
 				INFOPLIST_FILE = Runner/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
-				LIBRARY_SEARCH_PATHS = (
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.bookstore;
-					"$(inherited)",
-					"$(PROJECT_DIR)/Flutter",
-				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.example.navigationAndRouting;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
@@ -448,17 +500,9 @@
 				CLANG_ENABLE_MODULES = YES;
 				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
 				ENABLE_BITCODE = NO;
-				FRAMEWORK_SEARCH_PATHS = (
-					"$(inherited)",
-					"$(PROJECT_DIR)/Flutter",
-				);
 				INFOPLIST_FILE = Runner/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
-				LIBRARY_SEARCH_PATHS = (
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.bookstore;
-					"$(inherited)",
-					"$(PROJECT_DIR)/Flutter",
-				);
-				PRODUCT_BUNDLE_IDENTIFIER = com.example.navigationAndRouting;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
 				SWIFT_VERSION = 5.0;

navigation_and_routing/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -2,6 +2,6 @@
 <Workspace
    version = "1.0">
    <FileRef
-      location = "group:Runner.xcodeproj">
+      location = "self:">
    </FileRef>
 </Workspace>

navigation_and_routing/ios/Runner.xcworkspace/contents.xcworkspacedata

@@ -4,4 +4,7 @@
    <FileRef
       location = "group:Runner.xcodeproj">
    </FileRef>
+   <FileRef
+      location = "group:Pods/Pods.xcodeproj">
+   </FileRef>
 </Workspace>

navigation_and_routing/ios/Runner/Info.plist

@@ -11,7 +11,7 @@
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleName</key>
-	<string>navigation_and_routing</string>
+	<string>bookstore</string>
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
@@ -41,5 +41,20 @@
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
 	<false/>
+	<key>FlutterDeepLinkingEnabled</key>
+    <true/>
+    <key>CFBundleURLTypes</key>
+    <array>
+        <dict>
+        <key>CFBundleTypeRole</key>
+        <string>Editor</string>
+        <key>CFBundleURLName</key>
+        <string>flutterbooksample.com</string>
+        <key>CFBundleURLSchemes</key>
+        <array>
+        <string>customscheme</string>
+        </array>
+        </dict>
+    </array>
 </dict>
 </plist>

navigation_and_routing/lib/main.dart

@@ -0,0 +1,15 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:url_strategy/url_strategy.dart';
+
+import 'src/app.dart';
+
+void main() {
+  // Use package:url_strategy until this pull request is released:
+  // https://github.com/flutter/flutter/pull/77103
+  setPathUrlStrategy();
+  runApp(const Bookstore());
+}

navigation_and_routing/lib/src/app.dart

@@ -0,0 +1,101 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'auth.dart';
+import 'data.dart';
+import 'routing.dart';
+import 'screens/navigator.dart';
+import 'widgets/library_scope.dart';
+
+class Bookstore extends StatefulWidget {
+  const Bookstore({Key? key}) : super(key: key);
+
+  @override
+  _BookstoreState createState() => _BookstoreState();
+}
+
+class _BookstoreState extends State<Bookstore> {
+  final auth = BookstoreAuth();
+  late final BookstoreRouteGuard guard;
+  late final RouteState routeState;
+  late final SimpleRouterDelegate routerDelegate;
+  late final TemplateRouteParser routeParser;
+  final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
+
+  final library = Library()
+    ..addBook('Left Hand of Darkness', 'Ursula K. Le Guin', true, true)
+    ..addBook('Too Like the Lightning', 'Ada Palmer', false, true)
+    ..addBook('Kindred', 'Octavia E. Butler', true, false)
+    ..addBook('The Lathe of Heaven', 'Ursula K. Le Guin', false, false);
+
+  @override
+  void initState() {
+    guard = BookstoreRouteGuard(auth: auth);
+
+    /// Configure the parser with all of the app's allowed path templates.
+    routeParser = TemplateRouteParser(
+      [
+        '/signin',
+        '/authors',
+        '/settings',
+        '/books/new',
+        '/books/all',
+        '/books/popular',
+        '/book/:bookId',
+        '/author/:authorId',
+      ],
+      guard: guard,
+      initialRoute: '/signin',
+    );
+
+    routeState = RouteState(routeParser);
+
+    routerDelegate = SimpleRouterDelegate(
+      routeState: routeState,
+      navigatorKey: navigatorKey,
+      builder: (context) => BookstoreNavigator(
+        navigatorKey: navigatorKey,
+        auth: auth,
+      ),
+    );
+
+    // Listen for when the user logs out and display the signin screen.
+    auth.addListener(_handleAuthStateChanged);
+
+    super.initState();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return RouteStateScope(
+      notifier: routeState,
+      child: BookstoreAuthScope(
+        notifier: auth,
+        child: LibraryScope(
+          library: library,
+          child: MaterialApp.router(
+            routerDelegate: routerDelegate,
+            routeInformationParser: routeParser,
+          ),
+        ),
+      ),
+    );
+  }
+
+  Future<void> _handleAuthStateChanged() async {
+    if (!auth.signedIn) {
+      routeState.go('/signin');
+    }
+  }
+
+  @override
+  void dispose() {
+    auth.removeListener(_handleAuthStateChanged);
+    routeState.dispose();
+    routerDelegate.dispose();
+    super.dispose();
+  }
+}

navigation_and_routing/lib/src/auth.dart

@@ -0,0 +1,2 @@
+export 'auth/auth.dart';
+export 'auth/auth_guard.dart';

navigation_and_routing/lib/src/auth/auth.dart

@@ -0,0 +1,53 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
+/// A mock authentication service
+class BookstoreAuth extends ChangeNotifier {
+  bool _signedIn = false;
+
+  bool get signedIn {
+    return _signedIn;
+  }
+
+  Future<void> signOut() async {
+    await Future<void>.delayed(const Duration(milliseconds: 200));
+    // Sign out.
+    _signedIn = false;
+    notifyListeners();
+  }
+
+  Future<bool> signIn(String username, String password) async {
+    await Future<void>.delayed(const Duration(milliseconds: 200));
+
+    // Sign in. Allow any password.
+    _signedIn = true;
+    notifyListeners();
+    return _signedIn;
+  }
+
+  @override
+  bool operator ==(Object other) {
+    return other is BookstoreAuth && other._signedIn == _signedIn;
+  }
+
+  @override
+  int get hashCode => _signedIn.hashCode;
+}
+
+class BookstoreAuthScope extends InheritedNotifier<BookstoreAuth> {
+  const BookstoreAuthScope({
+    required BookstoreAuth notifier,
+    required Widget child,
+    Key? key,
+  }) : super(key: key, notifier: notifier, child: child);
+
+  static BookstoreAuth? of(BuildContext context) {
+    return context
+        .dependOnInheritedWidgetOfExactType<BookstoreAuthScope>()
+        ?.notifier;
+  }
+}

navigation_and_routing/lib/src/auth/auth_guard.dart

@@ -0,0 +1,32 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import '../routing.dart';
+import 'auth.dart';
+
+/// An implementation of [RouteGuard] that redirects to /signIn
+class BookstoreRouteGuard implements RouteGuard<ParsedRoute> {
+  BookstoreAuth auth;
+
+  BookstoreRouteGuard({
+    required this.auth,
+  });
+
+  /// Redirect to /signin if the user isn't signed in.
+  @override
+  Future<ParsedRoute> redirect(ParsedRoute from) async {
+    final signedIn = auth.signedIn;
+    final signInRoute = ParsedRoute('/signin', '/signin', {}, {});
+
+    // Go to /signin if the user is not signed in
+    if (!signedIn && from != signInRoute) {
+      return signInRoute;
+    }
+    // Go to /books if the user is signed in and tries to go to /signin.
+    else if (signedIn && from == signInRoute) {
+      return ParsedRoute('/books/popular', '/books/popular', {}, {});
+    }
+    return from;
+  }
+}

navigation_and_routing/lib/src/data.dart

@@ -0,0 +1,3 @@
+export 'data/author.dart';
+export 'data/book.dart';
+export 'data/library.dart';

navigation_and_routing/lib/src/data/author.dart

@@ -0,0 +1,13 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'book.dart';
+
+class Author {
+  final int id;
+  final String name;
+  final List<Book> books;
+
+  Author(this.id, this.name, this.books);
+}

navigation_and_routing/lib/src/data/book.dart

@@ -0,0 +1,15 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'author.dart';
+
+class Book {
+  final int id;
+  final String title;
+  late final Author author;
+  final bool isPopular;
+  final bool isNew;
+
+  Book(this.id, this.title, this.isPopular, this.isNew);
+}

navigation_and_routing/lib/src/data/library.dart

@@ -0,0 +1,41 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:collection/collection.dart';
+
+import 'author.dart';
+import 'book.dart';
+
+class Library {
+  final List<Book> allBooks = [];
+  final List<Author> allAuthors = [];
+
+  void addBook(String title, String authorName, bool isPopular, bool isNew) {
+    var author =
+        allAuthors.firstWhereOrNull((author) => author.name == authorName);
+    var book = Book(allBooks.length, title, isPopular, isNew);
+
+    if (author == null) {
+      author = Author(allAuthors.length, authorName, [book]);
+      allAuthors.add(author);
+    } else {
+      author.books.add(book);
+    }
+
+    book.author = author;
+    allBooks.add(book);
+  }
+
+  List<Book> get popularBooks {
+    return [
+      ...allBooks.where((book) => book.isPopular),
+    ];
+  }
+
+  List<Book> get newBooks {
+    return [
+      ...allBooks.where((book) => book.isNew),
+    ];
+  }
+}

navigation_and_routing/lib/src/routing.dart

@@ -0,0 +1,4 @@
+export 'routing/delegate.dart';
+export 'routing/parsed_route.dart';
+export 'routing/parser.dart';
+export 'routing/route_state.dart';

navigation_and_routing/lib/src/routing/delegate.dart

@@ -0,0 +1,52 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:async';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
+import 'parsed_route.dart';
+import 'route_state.dart';
+
+class SimpleRouterDelegate extends RouterDelegate<ParsedRoute>
+    with ChangeNotifier, PopNavigatorRouterDelegateMixin<ParsedRoute> {
+  final RouteState routeState;
+  final WidgetBuilder builder;
+
+  @override
+  final GlobalKey<NavigatorState> navigatorKey;
+
+  SimpleRouterDelegate({
+    required this.routeState,
+    required this.builder,
+    required this.navigatorKey,
+    // ignore: prefer_initializing_formals
+  }) {
+    routeState.addListener(notifyListeners);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return builder(context);
+  }
+
+  @override
+  Future<void> setNewRoutePath(ParsedRoute configuration) async {
+    routeState.route = configuration;
+    return SynchronousFuture(null);
+  }
+
+  @override
+  ParsedRoute get currentConfiguration {
+    return routeState.route;
+  }
+
+  @override
+  void dispose() {
+    routeState.removeListener(notifyListeners);
+    routeState.dispose();
+    super.dispose();
+  }
+}

navigation_and_routing/lib/src/routing/parsed_route.dart

@@ -0,0 +1,45 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:collection/collection.dart';
+import 'package:quiver/core.dart';
+
+import 'parser.dart';
+
+/// A route path that has been parsed by [TemplateRouteParser].
+class ParsedRoute {
+  final String path;
+  final String pathTemplate;
+  final Map<String, String> parameters;
+  final Map<String, String> queryParameters;
+
+  static const _mapEquality = MapEquality<String, String>();
+
+  ParsedRoute(
+      this.path, this.pathTemplate, this.parameters, this.queryParameters);
+
+  @override
+  bool operator ==(Object other) {
+    return other is ParsedRoute &&
+        other.pathTemplate == pathTemplate &&
+        other.path == path &&
+        _mapEquality.equals(parameters, other.parameters) &&
+        _mapEquality.equals(queryParameters, other.queryParameters);
+  }
+
+  @override
+  int get hashCode => hash4(
+        path,
+        pathTemplate,
+        _mapEquality.hash(parameters),
+        _mapEquality.hash(queryParameters),
+      );
+
+  @override
+  String toString() => '<ParsedRoute '
+      'template: $pathTemplate '
+      'path: $path '
+      'parameters: $parameters '
+      'query parameters: $queryParameters>';
+}

navigation_and_routing/lib/src/routing/parser.dart

@@ -0,0 +1,68 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/widgets.dart';
+import 'package:path_to_regexp/path_to_regexp.dart';
+
+import 'parsed_route.dart';
+
+abstract class RouteGuard<T> {
+  Future<T> redirect(T from);
+}
+
+/// Parses the URI path into a [ParsedRoute].
+class TemplateRouteParser extends RouteInformationParser<ParsedRoute> {
+  final List<String> _pathTemplates = [];
+  RouteGuard<ParsedRoute>? guard;
+  final ParsedRoute initialRoute;
+
+  TemplateRouteParser(List<String> pathTemplates,
+      {String? initialRoute = '/', this.guard})
+      : initialRoute =
+            ParsedRoute(initialRoute ?? '/', initialRoute ?? '/', {}, {}) {
+    for (var template in pathTemplates) {
+      _addRoute(template);
+    }
+  }
+
+  void _addRoute(String pathTemplate) {
+    _pathTemplates.add(pathTemplate);
+  }
+
+  @override
+  Future<ParsedRoute> parseRouteInformation(
+      RouteInformation routeInformation) async {
+    return await _parse(routeInformation);
+  }
+
+  Future<ParsedRoute> _parse(RouteInformation routeInformation) async {
+    final path = routeInformation.location!;
+    final queryParams = Uri.parse(path).queryParameters;
+    var parsedRoute = initialRoute;
+
+    for (var pathTemplate in _pathTemplates) {
+      final parameters = <String>[];
+      var pathRegExp = pathToRegExp(pathTemplate, parameters: parameters);
+      if (pathRegExp.hasMatch(path)) {
+        final match = pathRegExp.matchAsPrefix(path);
+        if (match == null) continue;
+        final params = extract(parameters, match);
+        parsedRoute = ParsedRoute(path, pathTemplate, params, queryParams);
+      }
+    }
+
+    // Redirect if a guard is present
+    var guard = this.guard;
+    if (guard != null) {
+      return guard.redirect(parsedRoute);
+    }
+
+    return parsedRoute;
+  }
+
+  @override
+  RouteInformation restoreRouteInformation(ParsedRoute configuration) {
+    return RouteInformation(location: configuration.path);
+  }
+}

navigation_and_routing/lib/src/routing/route_state.dart

@@ -0,0 +1,50 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
+import 'parsed_route.dart';
+import 'parser.dart';
+
+/// The current route state. To change the current route, call obtain the state using
+/// `RouteState.of(context)` and call `go()`:
+///
+/// ```
+/// RouteState.of(context).go('/book/2');
+/// ```
+class RouteState extends ChangeNotifier {
+  TemplateRouteParser parser;
+  ParsedRoute _route;
+
+  RouteState(this.parser)
+      : _route = parser.initialRoute;
+
+  ParsedRoute get route => _route;
+
+  set route(ParsedRoute route) {
+    _route = route;
+    notifyListeners();
+  }
+
+  Future<void> go(String route) async {
+    this.route =
+        await parser.parseRouteInformation(RouteInformation(location: route));
+  }
+}
+
+/// Provides the current [RouteState] to descendent widgets in the tree.
+class RouteStateScope extends InheritedNotifier<RouteState> {
+  const RouteStateScope({
+    required RouteState notifier,
+    required Widget child,
+    Key? key,
+  }) : super(key: key, notifier: notifier, child: child);
+
+  static RouteState? of(BuildContext context) {
+    return context
+        .dependOnInheritedWidgetOfExactType<RouteStateScope>()
+        ?.notifier;
+  }
+}

navigation_and_routing/lib/src/screens/author_details.dart

@@ -0,0 +1,49 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import '../data.dart';
+import '../widgets/book_list.dart';
+import 'book_details.dart';
+
+class AuthorDetailsScreen extends StatelessWidget {
+  final Author author;
+
+  const AuthorDetailsScreen({
+    Key? key,
+    required this.author,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(author.name),
+      ),
+      body: Center(
+        child: Column(
+          children: [
+            Expanded(
+              child: BookList(
+                books: author.books,
+                onTap: (book) {
+                  Navigator.of(context).push<dynamic>(
+                    MaterialPageRoute<dynamic>(
+                      builder: (context) {
+                        return BookDetailsScreen(
+                          book: book,
+                        );
+                      },
+                    ),
+                  );
+                },
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

navigation_and_routing/lib/src/screens/authors.dart

@@ -0,0 +1,30 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import '../routing.dart';
+import '../widgets/author_list.dart';
+import '../widgets/library_scope.dart';
+
+class AuthorsScreen extends StatelessWidget {
+  final String title = "Authors";
+
+  const AuthorsScreen({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(title),
+      ),
+      body: AuthorList(
+        authors: LibraryScope.of(context).allAuthors,
+        onTap: (author) {
+          RouteStateScope.of(context)!.go('/author/${author.id}');
+        },
+      ),
+    );
+  }
+}

navigation_and_routing/lib/src/screens/book_details.dart

@@ -0,0 +1,75 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:url_launcher/link.dart';
+
+import '../data.dart';
+import 'author_details.dart';
+
+class BookDetailsScreen extends StatelessWidget {
+  final Book? book;
+
+  const BookDetailsScreen({
+    Key? key,
+    this.book,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    if (book == null) {
+      return const Scaffold(
+        body: Center(
+          child: Text('No book with found.'),
+        ),
+      );
+    }
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(book!.title),
+      ),
+      body: Center(
+        child: Column(
+          children: [
+            Text(
+              book!.title,
+              style: Theme
+                  .of(context)
+                  .textTheme
+                  .headline4,
+            ),
+            Text(
+              book!.author.name,
+              style: Theme
+                  .of(context)
+                  .textTheme
+                  .subtitle1,
+            ),
+            TextButton(
+              child: const Text('View author (Push)'),
+              onPressed: () {
+                Navigator.of(context).push<void>(
+                  MaterialPageRoute<void>(
+                    builder: (context) {
+                      return AuthorDetailsScreen(author: book!.author);
+                    },
+                  ),
+                );
+              },
+            ),
+            Link(
+              uri: Uri.parse('/author/${book!.author.id}'),
+              builder: (context, followLink) {
+                return TextButton(
+                  child: const Text('View author (Link)'),
+                  onPressed: followLink,
+                );
+              },
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

navigation_and_routing/lib/src/screens/books.dart

@@ -0,0 +1,130 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import '../data.dart';
+import '../routing.dart';
+import '../widgets/book_list.dart';
+import '../widgets/library_scope.dart';
+
+class BooksScreen extends StatefulWidget {
+  final ParsedRoute currentRoute;
+
+  const BooksScreen({
+    Key? key,
+    required this.currentRoute,
+  }) : super(key: key);
+
+  @override
+  _BooksScreenState createState() => _BooksScreenState();
+}
+
+class _BooksScreenState extends State<BooksScreen>
+    with SingleTickerProviderStateMixin {
+  late TabController _tabController;
+
+  @override
+  void initState() {
+    super.initState();
+    _tabController = TabController(length: 3, vsync: this)
+      ..addListener(_handleTabIndexChanged);
+  }
+
+  @override
+  void dispose() {
+    _tabController.removeListener(_handleTabIndexChanged);
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final library = LibraryScope.of(context);
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Books'),
+        bottom: TabBar(
+          controller: _tabController,
+          tabs: const [
+            Tab(
+              text: 'Popular',
+              icon: Icon(Icons.people),
+            ),
+            Tab(
+              text: 'New',
+              icon: Icon(Icons.new_releases),
+            ),
+            Tab(
+              text: 'All',
+              icon: Icon(Icons.list),
+            ),
+          ],
+        ),
+      ),
+      body: TabBarView(
+        controller: _tabController,
+        children: [
+          BookList(
+            books: library.popularBooks,
+            onTap: _handleBookTapped,
+          ),
+          BookList(
+            books: library.newBooks,
+            onTap: _handleBookTapped,
+          ),
+          BookList(
+            books: library.allBooks,
+            onTap: _handleBookTapped,
+          ),
+        ],
+      ),
+    );
+  }
+
+  String get title {
+    switch (_tabController.index) {
+      case 1:
+        return 'New';
+      case 2:
+        return 'All';
+      case 0:
+      default:
+        return 'Popular';
+    }
+  }
+
+  RouteState get routeState => RouteStateScope.of(context)!;
+
+  void _handleBookTapped(Book book) {
+    routeState.go('/book/${book.id}');
+  }
+
+  void _handleTabIndexChanged() {
+    switch (_tabController.index) {
+      case 1:
+        routeState.go('/books/new');
+        break;
+      case 2:
+        routeState.go('/books/all');
+        break;
+      case 0:
+      default:
+        routeState.go('/books/popular');
+        break;
+    }
+  }
+
+  @override
+  void didUpdateWidget(BooksScreen oldWidget) {
+    var newPath = routeState.route.pathTemplate;
+    if (newPath.startsWith('/books/popular')) {
+      _tabController.index = 0;
+    } else if (newPath.startsWith('/books/new')) {
+      _tabController.index = 1;
+    } else if (newPath == '/books/all') {
+      _tabController.index = 2;
+    }
+    super.didUpdateWidget(oldWidget);
+  }
+}

navigation_and_routing/lib/src/screens/navigator.dart

@@ -0,0 +1,111 @@
+import 'package:collection/collection.dart';
+import 'package:flutter/material.dart';
+
+import '../auth.dart';
+import '../data.dart';
+import '../routing.dart';
+import '../screens/sign_in.dart';
+import '../widgets/fade_transition_page.dart';
+import '../widgets/library_scope.dart';
+import 'author_details.dart';
+import 'book_details.dart';
+import 'scaffold.dart';
+
+/// Builds the top-level navigator for the app. The pages to display are based
+/// on the [routeState] that was parsed by the TemplateRouteParser.
+class BookstoreNavigator extends StatefulWidget {
+  final GlobalKey<NavigatorState> navigatorKey;
+  final BookstoreAuth auth;
+
+  const BookstoreNavigator({
+    required this.auth,
+    required this.navigatorKey,
+    Key? key,
+  }) : super(key: key);
+
+  @override
+  _BookstoreNavigatorState createState() => _BookstoreNavigatorState();
+}
+
+class _BookstoreNavigatorState extends State<BookstoreNavigator> {
+  final scaffoldKey = const ValueKey<String>('App scaffold');
+  final bookDetailsKey = const ValueKey<String>('Book details screen');
+  final authorDetailsKey = const ValueKey<String>('Author details screen');
+
+  @override
+  Widget build(BuildContext context) {
+    final routeState = RouteStateScope.of(context)!;
+    final pathTemplate = routeState.route.pathTemplate;
+    final library = LibraryScope.of(context);
+
+    Book? book;
+    if (pathTemplate == '/book/:bookId') {
+      book = library.allBooks.firstWhereOrNull(
+          (b) => b.id.toString() == routeState.route.parameters['bookId']);
+    }
+
+    Author? author;
+    if (pathTemplate == '/author/:authorId') {
+      author = library.allAuthors.firstWhereOrNull(
+          (b) => b.id.toString() == routeState.route.parameters['authorId']);
+    }
+
+    return Navigator(
+      key: widget.navigatorKey,
+      onPopPage: (route, dynamic result) {
+        // When a page that is stacked on top of the scaffold is popped, display
+        // the /books or /authors tab in BookstoreScaffold.
+        if (route.settings is Page &&
+            (route.settings as Page).key == bookDetailsKey) {
+          routeState.go('/books/popular');
+        }
+
+        if (route.settings is Page &&
+            (route.settings as Page).key == authorDetailsKey) {
+          routeState.go('/authors');
+        }
+
+        return route.didPop(result);
+      },
+      pages: [
+        if (routeState.route.pathTemplate == '/signin')
+          // Display the sign in screen.
+          FadeTransitionPage<void>(
+            key: const ValueKey('Sign in'),
+            child: SignInScreen(
+              onSignIn: (credentials) async {
+                var signedIn = await widget.auth
+                    .signIn(credentials.username, credentials.password);
+                if (signedIn) {
+                  routeState.go('/books/popular');
+                }
+              },
+            ),
+          )
+        else ...[
+          // Display the app
+          FadeTransitionPage<void>(
+            key: scaffoldKey,
+            child: const BookstoreScaffold(),
+          ),
+          // Add an additional page to the stack if the user is viewing a book
+          // or an author
+          if (book != null)
+            MaterialPage<void>(
+              key: bookDetailsKey,
+              child: BookDetailsScreen(
+                book: book,
+              ),
+            )
+          else if (author != null)
+            MaterialPage<void>(
+              key: authorDetailsKey,
+              child: AuthorDetailsScreen(
+                author: author,
+              ),
+            ),
+        ],
+      ],
+    );
+  }
+}

navigation_and_routing/lib/src/screens/scaffold.dart

@@ -0,0 +1,54 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:adaptive_navigation/adaptive_navigation.dart';
+import 'package:flutter/material.dart';
+
+import '../routing.dart';
+import 'scaffold_body.dart';
+
+class BookstoreScaffold extends StatelessWidget {
+  const BookstoreScaffold({
+    Key? key,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    final routeState = RouteStateScope.of(context)!;
+    final selectedIndex = _getSelectedIndex(routeState.route.pathTemplate);
+
+    return Scaffold(
+      body: AdaptiveNavigationScaffold(
+        selectedIndex: selectedIndex,
+        body: const BookstoreScaffoldBody(),
+        onDestinationSelected: (idx) {
+          if (idx == 0) routeState.go('/books/popular');
+          if (idx == 1) routeState.go('/authors');
+          if (idx == 2) routeState.go('/settings');
+        },
+        destinations: const [
+          AdaptiveScaffoldDestination(
+            title: 'Books',
+            icon: Icons.book,
+          ),
+          AdaptiveScaffoldDestination(
+            title: 'Authors',
+            icon: Icons.person,
+          ),
+          AdaptiveScaffoldDestination(
+            title: 'Settings',
+            icon: Icons.settings,
+          ),
+        ],
+      ),
+    );
+  }
+
+  int _getSelectedIndex(String pathTemplate) {
+    if (pathTemplate.startsWith('/books')) return 0;
+    if (pathTemplate == '/authors') return 1;
+    if (pathTemplate == '/settings') return 2;
+    return 0;
+  }
+}

navigation_and_routing/lib/src/screens/scaffold_body.dart

@@ -0,0 +1,62 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import '../routing.dart';
+import '../screens/settings.dart';
+import '../widgets/fade_transition_page.dart';
+import 'authors.dart';
+import 'books.dart';
+
+/// Displays the contents of the body of [BookstoreScaffold]
+class BookstoreScaffoldBody extends StatelessWidget {
+  static GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
+
+  const BookstoreScaffoldBody({
+    Key? key,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    var currentRoute = RouteStateScope.of(context)!.route;
+
+    // A nested Router isn't necessary because the back button behavior doesn't
+    // need to be customized.
+    return Navigator(
+      key: navigatorKey,
+      onPopPage: (route, dynamic result) => route.didPop(result),
+      pages: [
+        if (currentRoute.pathTemplate.startsWith('/authors'))
+          const FadeTransitionPage<void>(
+            key: ValueKey('authors'),
+            child: AuthorsScreen(),
+          )
+        else if (currentRoute.pathTemplate.startsWith('/settings'))
+          const FadeTransitionPage<void>(
+            key: ValueKey('settings'),
+            child: SettingsScreen(),
+          )
+        else if (currentRoute.pathTemplate.startsWith('/books') ||
+            currentRoute.pathTemplate == '/')
+          FadeTransitionPage<void>(
+            key: const ValueKey('books'),
+            child: BooksScreen(currentRoute: currentRoute),
+          )
+
+          // Avoid building a Navigator with an empty `pages` list when the
+          // RouteState is set to an unexpected path, such as /signin.
+          //
+          // Since RouteStateScope is an InheritedNotifier, any change to the
+          // route will result in a call to this build method, even though this
+          // widget isn't built when those routes are active.
+        else
+          FadeTransitionPage<void>(
+            key: const ValueKey('empty'),
+            child: Container(),
+          ),
+      ],
+    );
+  }
+}

navigation_and_routing/lib/src/screens/settings.dart

@@ -0,0 +1,103 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:url_launcher/link.dart';
+
+import '../auth/auth.dart';
+
+class SettingsScreen extends StatefulWidget {
+  const SettingsScreen({Key? key}) : super(key: key);
+
+  @override
+  _SettingsScreenState createState() => _SettingsScreenState();
+}
+
+class _SettingsScreenState extends State<SettingsScreen> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: SafeArea(
+        child: SingleChildScrollView(
+          child: Align(
+            alignment: Alignment.topCenter,
+            child: ConstrainedBox(
+              constraints: const BoxConstraints(maxWidth: 400),
+              child: const Card(
+                child: Padding(
+                  padding: EdgeInsets.symmetric(vertical: 18, horizontal: 12),
+                  child: SettingsContent(),
+                ),
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class SettingsContent extends StatelessWidget {
+  const SettingsContent({
+    Key? key,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        ...[
+          Text(
+            'Settings',
+            style: Theme.of(context).textTheme.headline4,
+          ),
+          ElevatedButton(
+            onPressed: () {
+              BookstoreAuthScope.of(context)!.signOut();
+            },
+            child: const Text('Sign out'),
+          ),
+          Link(
+            uri: Uri.parse('/book/0'),
+            builder: (context, followLink) {
+              return TextButton(
+                child: const Text('Go directly to /book/0'),
+                onPressed: followLink,
+              );
+            },
+          ),
+          Link(
+            uri: Uri.parse('/author/0'),
+            builder: (context, followLink) {
+              return TextButton(
+                child: const Text('Go directly to /author/0'),
+                onPressed: followLink,
+              );
+            },
+          ),
+        ].map((w) => Padding(padding: const EdgeInsets.all(8), child: w)),
+        TextButton(
+          onPressed: () => showDialog<String>(
+            context: context,
+            builder: (context) => AlertDialog(
+              title: const Text('Alert!'),
+              content: const Text('The alert description goes here.'),
+              actions: <Widget>[
+                TextButton(
+                  onPressed: () => Navigator.pop(context, 'Cancel'),
+                  child: const Text('Cancel'),
+                ),
+                TextButton(
+                  onPressed: () => Navigator.pop(context, 'OK'),
+                  child: const Text('OK'),
+                ),
+              ],
+            ),
+          ),
+          child: const Text('Show Dialog'),
+        )
+      ],
+    );
+  }
+}

navigation_and_routing/lib/src/screens/sign_in.dart

@@ -0,0 +1,76 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+class Credentials {
+  final String username;
+  final String password;
+  Credentials(this.username, this.password);
+}
+
+class SignInScreen extends StatefulWidget {
+  final ValueChanged<Credentials> onSignIn;
+
+  const SignInScreen({
+    required this.onSignIn,
+    Key? key,
+  }) : super(key: key);
+
+  @override
+  _SignInScreenState createState() => _SignInScreenState();
+}
+
+class _SignInScreenState extends State<SignInScreen> {
+  String username = '';
+  String password = '';
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: Center(
+        child: Card(
+          child: Container(
+            constraints: BoxConstraints.loose(const Size(600, 600)),
+            padding: const EdgeInsets.all(8),
+            child: Column(
+              mainAxisAlignment: MainAxisAlignment.center,
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                Text('Sign in', style: Theme.of(context).textTheme.headline4),
+                TextField(
+                  decoration: const InputDecoration(labelText: 'Username'),
+                  onChanged: (v) {
+                    setState(() {
+                      username = v;
+                    });
+                  },
+                ),
+                TextField(
+                  decoration: const InputDecoration(labelText: 'Password'),
+                  obscureText: true,
+                  onChanged: (v) {
+                    setState(() {
+                      password = v;
+                    });
+                  },
+                ),
+                Padding(
+                  padding: const EdgeInsets.all(16),
+                  child: TextButton(
+                    onPressed: () async {
+                      widget.onSignIn(Credentials(username, password));
+                    },
+                    child: const Text('Sign in'),
+                  ),
+                ),
+              ],
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}

navigation_and_routing/lib/src/widgets/author_list.dart

@@ -0,0 +1,36 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import '../data.dart';
+
+class AuthorList extends StatelessWidget {
+  final List<Author> authors;
+  final ValueChanged<Author>? onTap;
+
+  const AuthorList({
+    required this.authors,
+    this.onTap,
+    Key? key,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return ListView.builder(
+      itemCount: authors.length,
+      itemBuilder: (context, index) {
+        return ListTile(
+          title: Text(
+            authors[index].name,
+          ),
+          subtitle: Text(
+            '${authors[index].books.length} books',
+          ),
+          onTap: onTap != null ? () => onTap!(authors[index]) : null,
+        );
+      },
+    );
+  }
+}

navigation_and_routing/lib/src/widgets/book_list.dart

@@ -0,0 +1,36 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import '../data.dart';
+
+class BookList extends StatelessWidget {
+  final List<Book> books;
+  final ValueChanged<Book>? onTap;
+
+  const BookList({
+    required this.books,
+    this.onTap,
+    Key? key,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return ListView.builder(
+      itemCount: books.length,
+      itemBuilder: (context, index) {
+        return ListTile(
+          title: Text(
+            books[index].title,
+          ),
+          subtitle: Text(
+            books[index].author.name,
+          ),
+          onTap: onTap != null ? () => onTap!(books[index]) : null,
+        );
+      },
+    );
+  }
+}

navigation_and_routing/lib/src/widgets/fade_transition_page.dart

@@ -0,0 +1,52 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+class FadeTransitionPage<T> extends Page<T> {
+  final Widget child;
+
+  const FadeTransitionPage({LocalKey? key, required this.child})
+      : super(key: key);
+
+  @override
+  Route<T> createRoute(BuildContext context) {
+    return PageBasedFadeTransitionRoute<T>(this);
+  }
+}
+
+class PageBasedFadeTransitionRoute<T> extends PageRoute<T> {
+  PageBasedFadeTransitionRoute(Page page)
+      : super(
+          settings: page,
+        );
+
+  @override
+  Color? get barrierColor => null;
+
+  @override
+  String? get barrierLabel => null;
+
+  @override
+  Duration get transitionDuration => const Duration(milliseconds: 300);
+
+  @override
+  bool get maintainState => true;
+
+  @override
+  Widget buildPage(BuildContext context, Animation<double> animation,
+      Animation<double> secondaryAnimation) {
+    var curveTween = CurveTween(curve: Curves.easeIn);
+    return FadeTransition(
+      opacity: animation.drive(curveTween),
+      child: (settings as FadeTransitionPage).child,
+    );
+  }
+
+  @override
+  Widget buildTransitions(BuildContext context, Animation<double> animation,
+      Animation<double> secondaryAnimation, Widget child) {
+    return child;
+  }
+}

navigation_and_routing/lib/src/widgets/library_scope.dart

@@ -0,0 +1,25 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/widgets.dart';
+
+import '../data.dart';
+
+class LibraryScope extends InheritedWidget {
+  final Library library;
+
+  const LibraryScope({
+    Key? key,
+    required this.library,
+    required Widget child,
+  }) : super(key: key, child: child);
+
+  @override
+  bool updateShouldNotify(LibraryScope oldWidget) =>
+      library != oldWidget.library;
+
+  static Library of(BuildContext context) {
+    return context.dependOnInheritedWidgetOfExactType<LibraryScope>()!.library;
+  }
+}

navigation_and_routing/macos/.gitignore

@@ -0,0 +1,6 @@
+# Flutter-related
+**/Flutter/ephemeral/
+**/Pods/
+
+# Xcode-related
+**/xcuserdata/

navigation_and_routing/macos/Flutter/Flutter-Debug.xcconfig

@@ -0,0 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
+#include "ephemeral/Flutter-Generated.xcconfig"

navigation_and_routing/macos/Flutter/Flutter-Release.xcconfig

@@ -0,0 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
+#include "ephemeral/Flutter-Generated.xcconfig"

navigation_and_routing/macos/Flutter/GeneratedPluginRegistrant.swift

@@ -0,0 +1,12 @@
+//
+//  Generated file. Do not edit.
+//
+
+import FlutterMacOS
+import Foundation
+
+import url_launcher_macos
+
+func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
+  UrlLauncherPlugin.register(with: registry.registrar(forPlugin: "UrlLauncherPlugin"))
+}

navigation_and_routing/macos/Podfile

@@ -0,0 +1,40 @@
+platform :osx, '10.11'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'ephemeral', 'Flutter-Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure \"flutter pub get\" is executed first"
+  end
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Flutter-Generated.xcconfig, then run \"flutter pub get\""
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_macos_podfile_setup
+
+target 'Runner' do
+  use_frameworks!
+  use_modular_headers!
+
+  flutter_install_all_macos_pods File.dirname(File.realpath(__FILE__))
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_macos_build_settings(target)
+  end
+end

navigation_and_routing/macos/Runner.xcodeproj/project.pbxproj

@@ -0,0 +1,572 @@
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+			);
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+			children = (
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+				33CC10F72044A3C60003C045 /* Info.plist */,
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+				33BA886A226E78AF003329D5 /* Configs */,
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+				MACOSX_DEPLOYMENT_TARGET = 10.11;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = macosx;
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+			};
+			name = Release;
+		};
+		33CC10FC2044A3C60003C045 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 33E5194F232828860026EE4D /* AppInfo.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CODE_SIGN_ENTITLEMENTS = Runner/DebugProfile.entitlements;
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/../Frameworks",
+				);
+				PROVISIONING_PROFILE_SPECIFIER = "";
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 5.0;
+			};
+			name = Debug;
+		};
+		33CC10FD2044A3C60003C045 /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 33E5194F232828860026EE4D /* AppInfo.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CODE_SIGN_ENTITLEMENTS = Runner/Release.entitlements;
+				CODE_SIGN_STYLE = Automatic;
+				COMBINE_HIDPI_IMAGES = YES;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/../Frameworks",
+				);
+				PROVISIONING_PROFILE_SPECIFIER = "";
+				SWIFT_VERSION = 5.0;
+			};
+			name = Release;
+		};
+		33CC111C2044C6BA0003C045 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Manual;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+			};
+			name = Debug;
+		};
+		33CC111D2044C6BA0003C045 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				CODE_SIGN_STYLE = Automatic;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		33CC10E82044A3C60003C045 /* Build configuration list for PBXProject "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				33CC10F92044A3C60003C045 /* Debug */,
+				33CC10FA2044A3C60003C045 /* Release */,
+				338D0CE9231458BD00FA5F75 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		33CC10FB2044A3C60003C045 /* Build configuration list for PBXNativeTarget "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				33CC10FC2044A3C60003C045 /* Debug */,
+				33CC10FD2044A3C60003C045 /* Release */,
+				338D0CEA231458BD00FA5F75 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		33CC111B2044C6BA0003C045 /* Build configuration list for PBXAggregateTarget "Flutter Assemble" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				33CC111C2044C6BA0003C045 /* Debug */,
+				33CC111D2044C6BA0003C045 /* Release */,
+				338D0CEB231458BD00FA5F75 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 33CC10E52044A3C60003C045 /* Project object */;
+}

navigation_and_routing/macos/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

navigation_and_routing/macos/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -0,0 +1,89 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1000"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "33CC10EC2044A3C60003C045"
+               BuildableName = "bookstore.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "33CC10EC2044A3C60003C045"
+            BuildableName = "bookstore.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "33CC10EC2044A3C60003C045"
+            BuildableName = "bookstore.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "33CC10EC2044A3C60003C045"
+            BuildableName = "bookstore.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

navigation_and_routing/macos/Runner.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>

navigation_and_routing/macos/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

navigation_and_routing/macos/Runner/AppDelegate.swift

@@ -0,0 +1,9 @@
+import Cocoa
+import FlutterMacOS
+
+@NSApplicationMain
+class AppDelegate: FlutterAppDelegate {
+  override func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
+    return true
+  }
+}

navigation_and_routing/macos/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,68 @@
+{
+  "images" : [
+    {
+      "size" : "16x16",
+      "idiom" : "mac",
+      "filename" : "app_icon_16.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "16x16",
+      "idiom" : "mac",
+      "filename" : "app_icon_32.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "32x32",
+      "idiom" : "mac",
+      "filename" : "app_icon_32.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "32x32",
+      "idiom" : "mac",
+      "filename" : "app_icon_64.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "128x128",
+      "idiom" : "mac",
+      "filename" : "app_icon_128.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "128x128",
+      "idiom" : "mac",
+      "filename" : "app_icon_256.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "256x256",
+      "idiom" : "mac",
+      "filename" : "app_icon_256.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "256x256",
+      "idiom" : "mac",
+      "filename" : "app_icon_512.png",
+      "scale" : "2x"
+    },
+    {
+      "size" : "512x512",
+      "idiom" : "mac",
+      "filename" : "app_icon_512.png",
+      "scale" : "1x"
+    },
+    {
+      "size" : "512x512",
+      "idiom" : "mac",
+      "filename" : "app_icon_1024.png",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

navigation_and_routing/macos/Runner/Base.lproj/MainMenu.xib

@@ -0,0 +1,339 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
+    <dependencies>
+        <deployment identifier="macosx"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="14490.70"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <objects>
+        <customObject id="-2" userLabel="File's Owner" customClass="NSApplication">
+            <connections>
+                <outlet property="delegate" destination="Voe-Tx-rLC" id="GzC-gU-4Uq"/>
+            </connections>
+        </customObject>
+        <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
+        <customObject id="-3" userLabel="Application" customClass="NSObject"/>
+        <customObject id="Voe-Tx-rLC" customClass="AppDelegate" customModule="Runner" customModuleProvider="target">
+            <connections>
+                <outlet property="applicationMenu" destination="uQy-DD-JDr" id="XBo-yE-nKs"/>
+                <outlet property="mainFlutterWindow" destination="QvC-M9-y7g" id="gIp-Ho-8D9"/>
+            </connections>
+        </customObject>
+        <customObject id="YLy-65-1bz" customClass="NSFontManager"/>
+        <menu title="Main Menu" systemMenu="main" id="AYu-sK-qS6">
+            <items>
+                <menuItem title="APP_NAME" id="1Xt-HY-uBw">
+                    <modifierMask key="keyEquivalentModifierMask"/>
+                    <menu key="submenu" title="APP_NAME" systemMenu="apple" id="uQy-DD-JDr">
+                        <items>
+                            <menuItem title="About APP_NAME" id="5kV-Vb-QxS">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <connections>
+                                    <action selector="orderFrontStandardAboutPanel:" target="-1" id="Exp-CZ-Vem"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem isSeparatorItem="YES" id="VOq-y0-SEH"/>
+                            <menuItem title="Preferences…" keyEquivalent="," id="BOF-NM-1cW"/>
+                            <menuItem isSeparatorItem="YES" id="wFC-TO-SCJ"/>
+                            <menuItem title="Services" id="NMo-om-nkz">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Services" systemMenu="services" id="hz9-B4-Xy5"/>
+                            </menuItem>
+                            <menuItem isSeparatorItem="YES" id="4je-JR-u6R"/>
+                            <menuItem title="Hide APP_NAME" keyEquivalent="h" id="Olw-nP-bQN">
+                                <connections>
+                                    <action selector="hide:" target="-1" id="PnN-Uc-m68"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem title="Hide Others" keyEquivalent="h" id="Vdr-fp-XzO">
+                                <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
+                                <connections>
+                                    <action selector="hideOtherApplications:" target="-1" id="VT4-aY-XCT"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem title="Show All" id="Kd2-mp-pUS">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <connections>
+                                    <action selector="unhideAllApplications:" target="-1" id="Dhg-Le-xox"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem isSeparatorItem="YES" id="kCx-OE-vgT"/>
+                            <menuItem title="Quit APP_NAME" keyEquivalent="q" id="4sb-4s-VLi">
+                                <connections>
+                                    <action selector="terminate:" target="-1" id="Te7-pn-YzF"/>
+                                </connections>
+                            </menuItem>
+                        </items>
+                    </menu>
+                </menuItem>
+                <menuItem title="Edit" id="5QF-Oa-p0T">
+                    <modifierMask key="keyEquivalentModifierMask"/>
+                    <menu key="submenu" title="Edit" id="W48-6f-4Dl">
+                        <items>
+                            <menuItem title="Undo" keyEquivalent="z" id="dRJ-4n-Yzg">
+                                <connections>
+                                    <action selector="undo:" target="-1" id="M6e-cu-g7V"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem title="Redo" keyEquivalent="Z" id="6dh-zS-Vam">
+                                <connections>
+                                    <action selector="redo:" target="-1" id="oIA-Rs-6OD"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem isSeparatorItem="YES" id="WRV-NI-Exz"/>
+                            <menuItem title="Cut" keyEquivalent="x" id="uRl-iY-unG">
+                                <connections>
+                                    <action selector="cut:" target="-1" id="YJe-68-I9s"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem title="Copy" keyEquivalent="c" id="x3v-GG-iWU">
+                                <connections>
+                                    <action selector="copy:" target="-1" id="G1f-GL-Joy"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem title="Paste" keyEquivalent="v" id="gVA-U4-sdL">
+                                <connections>
+                                    <action selector="paste:" target="-1" id="UvS-8e-Qdg"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem title="Paste and Match Style" keyEquivalent="V" id="WeT-3V-zwk">
+                                <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
+                                <connections>
+                                    <action selector="pasteAsPlainText:" target="-1" id="cEh-KX-wJQ"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem title="Delete" id="pa3-QI-u2k">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <connections>
+                                    <action selector="delete:" target="-1" id="0Mk-Ml-PaM"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem title="Select All" keyEquivalent="a" id="Ruw-6m-B2m">
+                                <connections>
+                                    <action selector="selectAll:" target="-1" id="VNm-Mi-diN"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem isSeparatorItem="YES" id="uyl-h8-XO2"/>
+                            <menuItem title="Find" id="4EN-yA-p0u">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Find" id="1b7-l0-nxx">
+                                    <items>
+                                        <menuItem title="Find…" tag="1" keyEquivalent="f" id="Xz5-n4-O0W">
+                                            <connections>
+                                                <action selector="performFindPanelAction:" target="-1" id="cD7-Qs-BN4"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Find and Replace…" tag="12" keyEquivalent="f" id="YEy-JH-Tfz">
+                                            <modifierMask key="keyEquivalentModifierMask" option="YES" command="YES"/>
+                                            <connections>
+                                                <action selector="performFindPanelAction:" target="-1" id="WD3-Gg-5AJ"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Find Next" tag="2" keyEquivalent="g" id="q09-fT-Sye">
+                                            <connections>
+                                                <action selector="performFindPanelAction:" target="-1" id="NDo-RZ-v9R"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Find Previous" tag="3" keyEquivalent="G" id="OwM-mh-QMV">
+                                            <connections>
+                                                <action selector="performFindPanelAction:" target="-1" id="HOh-sY-3ay"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Use Selection for Find" tag="7" keyEquivalent="e" id="buJ-ug-pKt">
+                                            <connections>
+                                                <action selector="performFindPanelAction:" target="-1" id="U76-nv-p5D"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Jump to Selection" keyEquivalent="j" id="S0p-oC-mLd">
+                                            <connections>
+                                                <action selector="centerSelectionInVisibleArea:" target="-1" id="IOG-6D-g5B"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="Spelling and Grammar" id="Dv1-io-Yv7">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Spelling" id="3IN-sU-3Bg">
+                                    <items>
+                                        <menuItem title="Show Spelling and Grammar" keyEquivalent=":" id="HFo-cy-zxI">
+                                            <connections>
+                                                <action selector="showGuessPanel:" target="-1" id="vFj-Ks-hy3"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Check Document Now" keyEquivalent=";" id="hz2-CU-CR7">
+                                            <connections>
+                                                <action selector="checkSpelling:" target="-1" id="fz7-VC-reM"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="bNw-od-mp5"/>
+                                        <menuItem title="Check Spelling While Typing" id="rbD-Rh-wIN">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="toggleContinuousSpellChecking:" target="-1" id="7w6-Qz-0kB"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Check Grammar With Spelling" id="mK6-2p-4JG">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="toggleGrammarChecking:" target="-1" id="muD-Qn-j4w"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Correct Spelling Automatically" id="78Y-hA-62v">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="toggleAutomaticSpellingCorrection:" target="-1" id="2lM-Qi-WAP"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="Substitutions" id="9ic-FL-obx">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Substitutions" id="FeM-D8-WVr">
+                                    <items>
+                                        <menuItem title="Show Substitutions" id="z6F-FW-3nz">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="orderFrontSubstitutionsPanel:" target="-1" id="oku-mr-iSq"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem isSeparatorItem="YES" id="gPx-C9-uUO"/>
+                                        <menuItem title="Smart Copy/Paste" id="9yt-4B-nSM">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="toggleSmartInsertDelete:" target="-1" id="3IJ-Se-DZD"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Smart Quotes" id="hQb-2v-fYv">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="toggleAutomaticQuoteSubstitution:" target="-1" id="ptq-xd-QOA"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Smart Dashes" id="rgM-f4-ycn">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="toggleAutomaticDashSubstitution:" target="-1" id="oCt-pO-9gS"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Smart Links" id="cwL-P1-jid">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="toggleAutomaticLinkDetection:" target="-1" id="Gip-E3-Fov"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Data Detectors" id="tRr-pd-1PS">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="toggleAutomaticDataDetection:" target="-1" id="R1I-Nq-Kbl"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Text Replacement" id="HFQ-gK-NFA">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="toggleAutomaticTextReplacement:" target="-1" id="DvP-Fe-Py6"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="Transformations" id="2oI-Rn-ZJC">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Transformations" id="c8a-y6-VQd">
+                                    <items>
+                                        <menuItem title="Make Upper Case" id="vmV-6d-7jI">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="uppercaseWord:" target="-1" id="sPh-Tk-edu"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Make Lower Case" id="d9M-CD-aMd">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="lowercaseWord:" target="-1" id="iUZ-b5-hil"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Capitalize" id="UEZ-Bs-lqG">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="capitalizeWord:" target="-1" id="26H-TL-nsh"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                            <menuItem title="Speech" id="xrE-MZ-jX0">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <menu key="submenu" title="Speech" id="3rS-ZA-NoH">
+                                    <items>
+                                        <menuItem title="Start Speaking" id="Ynk-f8-cLZ">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="startSpeaking:" target="-1" id="654-Ng-kyl"/>
+                                            </connections>
+                                        </menuItem>
+                                        <menuItem title="Stop Speaking" id="Oyz-dy-DGm">
+                                            <modifierMask key="keyEquivalentModifierMask"/>
+                                            <connections>
+                                                <action selector="stopSpeaking:" target="-1" id="dX8-6p-jy9"/>
+                                            </connections>
+                                        </menuItem>
+                                    </items>
+                                </menu>
+                            </menuItem>
+                        </items>
+                    </menu>
+                </menuItem>
+                <menuItem title="View" id="H8h-7b-M4v">
+                    <modifierMask key="keyEquivalentModifierMask"/>
+                    <menu key="submenu" title="View" id="HyV-fh-RgO">
+                        <items>
+                            <menuItem title="Enter Full Screen" keyEquivalent="f" id="4J7-dP-txa">
+                                <modifierMask key="keyEquivalentModifierMask" control="YES" command="YES"/>
+                                <connections>
+                                    <action selector="toggleFullScreen:" target="-1" id="dU3-MA-1Rq"/>
+                                </connections>
+                            </menuItem>
+                        </items>
+                    </menu>
+                </menuItem>
+                <menuItem title="Window" id="aUF-d1-5bR">
+                    <modifierMask key="keyEquivalentModifierMask"/>
+                    <menu key="submenu" title="Window" systemMenu="window" id="Td7-aD-5lo">
+                        <items>
+                            <menuItem title="Minimize" keyEquivalent="m" id="OY7-WF-poV">
+                                <connections>
+                                    <action selector="performMiniaturize:" target="-1" id="VwT-WD-YPe"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem title="Zoom" id="R4o-n2-Eq4">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <connections>
+                                    <action selector="performZoom:" target="-1" id="DIl-cC-cCs"/>
+                                </connections>
+                            </menuItem>
+                            <menuItem isSeparatorItem="YES" id="eu3-7i-yIM"/>
+                            <menuItem title="Bring All to Front" id="LE2-aR-0XJ">
+                                <modifierMask key="keyEquivalentModifierMask"/>
+                                <connections>
+                                    <action selector="arrangeInFront:" target="-1" id="DRN-fu-gQh"/>
+                                </connections>
+                            </menuItem>
+                        </items>
+                    </menu>
+                </menuItem>
+            </items>
+            <point key="canvasLocation" x="142" y="-258"/>
+        </menu>
+        <window title="APP_NAME" allowsToolTipsWhenApplicationIsInactive="NO" autorecalculatesKeyViewLoop="NO" releasedWhenClosed="NO" animationBehavior="default" id="QvC-M9-y7g" customClass="MainFlutterWindow" customModule="Runner" customModuleProvider="target">
+            <windowStyleMask key="styleMask" titled="YES" closable="YES" miniaturizable="YES" resizable="YES"/>
+            <rect key="contentRect" x="335" y="390" width="800" height="600"/>
+            <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1577"/>
+            <view key="contentView" wantsLayer="YES" id="EiT-Mj-1SZ">
+                <rect key="frame" x="0.0" y="0.0" width="800" height="600"/>
+                <autoresizingMask key="autoresizingMask"/>
+            </view>
+        </window>
+    </objects>
+</document>

navigation_and_routing/macos/Runner/Configs/AppInfo.xcconfig

@@ -0,0 +1,14 @@
+// Application-level settings for the Runner target.
+//
+// This may be replaced with something auto-generated from metadata (e.g., pubspec.yaml) in the
+// future. If not, the values below would default to using the project name when this becomes a
+// 'flutter create' template.
+
+// The application's name. By default this is also the title of the Flutter window.
+PRODUCT_NAME = bookstore
+
+// The application's bundle identifier
+PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.bookstore
+
+// The copyright displayed in application information
+PRODUCT_COPYRIGHT = Copyright © 2021 dev.flutter. All rights reserved.

navigation_and_routing/macos/Runner/Configs/Debug.xcconfig

@@ -0,0 +1,2 @@
+#include "../../Flutter/Flutter-Debug.xcconfig"
+#include "Warnings.xcconfig"

navigation_and_routing/macos/Runner/Configs/Release.xcconfig

@@ -0,0 +1,2 @@
+#include "../../Flutter/Flutter-Release.xcconfig"
+#include "Warnings.xcconfig"

navigation_and_routing/macos/Runner/Configs/Warnings.xcconfig

@@ -0,0 +1,13 @@
+WARNING_CFLAGS = -Wall -Wconditional-uninitialized -Wnullable-to-nonnull-conversion -Wmissing-method-return-type -Woverlength-strings
+GCC_WARN_UNDECLARED_SELECTOR = YES
+CLANG_UNDEFINED_BEHAVIOR_SANITIZER_NULLABILITY = YES
+CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE
+CLANG_WARN__DUPLICATE_METHOD_MATCH = YES
+CLANG_WARN_PRAGMA_PACK = YES
+CLANG_WARN_STRICT_PROTOTYPES = YES
+CLANG_WARN_COMMA = YES
+GCC_WARN_STRICT_SELECTOR_MATCH = YES
+CLANG_WARN_OBJC_REPEATED_USE_OF_WEAK = YES
+CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES
+GCC_WARN_SHADOW = YES
+CLANG_WARN_UNREACHABLE_CODE = YES

navigation_and_routing/macos/Runner/DebugProfile.entitlements

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.cs.allow-jit</key>
+	<true/>
+	<key>com.apple.security.network.server</key>
+	<true/>
+</dict>
+</plist>

navigation_and_routing/macos/Runner/Info.plist

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIconFile</key>
+	<string></string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>$(MACOSX_DEPLOYMENT_TARGET)</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>$(PRODUCT_COPYRIGHT)</string>
+	<key>NSMainNibFile</key>
+	<string>MainMenu</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+</dict>
+</plist>

navigation_and_routing/macos/Runner/MainFlutterWindow.swift

@@ -0,0 +1,15 @@
+import Cocoa
+import FlutterMacOS
+
+class MainFlutterWindow: NSWindow {
+  override func awakeFromNib() {
+    let flutterViewController = FlutterViewController.init()
+    let windowFrame = self.frame
+    self.contentViewController = flutterViewController
+    self.setFrame(windowFrame, display: true)
+
+    RegisterGeneratedPlugins(registry: flutterViewController)
+
+    super.awakeFromNib()
+  }
+}

navigation_and_routing/macos/Runner/Release.entitlements

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+</dict>
+</plist>

navigation_and_routing/old_snippets/navigator/anonymous_routes.dart

@@ -9,31 +9,35 @@ library anonymous_routes;
 import 'package:flutter/material.dart';
 
 void main() {
-  runApp(Nav2App());
+  runApp(const Nav2App());
 }
 
 class Nav2App extends StatelessWidget {
+  const Nav2App({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
-    return MaterialApp(
+    return const MaterialApp(
       home: HomeScreen(),
     );
   }
 }
 
 class HomeScreen extends StatelessWidget {
+  const HomeScreen({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(),
       body: Center(
         child: TextButton(
-          child: Text('View Details'),
+          child: const Text('View Details'),
           onPressed: () {
-            Navigator.push(
+            Navigator.push<void>(
               context,
               MaterialPageRoute(builder: (context) {
-                return DetailScreen();
+                return const DetailScreen();
               }),
             );
           },
@@ -44,13 +48,15 @@ class HomeScreen extends StatelessWidget {
 }
 
 class DetailScreen extends StatelessWidget {
+  const DetailScreen({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(),
       body: Center(
         child: TextButton(
-          child: Text('Pop!'),
+          child: const Text('Pop!'),
           onPressed: () {
             Navigator.pop(context);
           },

navigation_and_routing/old_snippets/navigator/named_routes.dart

@@ -9,29 +9,33 @@ library named_routes;
 import 'package:flutter/material.dart';
 
 void main() {
-  runApp(Nav2App());
+  runApp(const Nav2App());
 }
 
 class Nav2App extends StatelessWidget {
+  const Nav2App({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
       routes: {
-        '/': (context) => HomeScreen(),
+        '/': (context) => const HomeScreen(),
-        '/details': (context) => DetailScreen(),
+        '/details': (context) => const DetailScreen(),
       },
     );
   }
 }
 
 class HomeScreen extends StatelessWidget {
+  const HomeScreen({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(),
       body: Center(
         child: TextButton(
-          child: Text('View Details'),
+          child: const Text('View Details'),
           onPressed: () {
             Navigator.pushNamed(
               context,
@@ -45,13 +49,15 @@ class HomeScreen extends StatelessWidget {
 }
 
 class DetailScreen extends StatelessWidget {
+  const DetailScreen({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(),
       body: Center(
         child: TextButton(
-          child: Text('Pop!'),
+          child: const Text('Pop!'),
           onPressed: () {
             Navigator.pop(context);
           },

navigation_and_routing/old_snippets/navigator/on_generate_route.dart

@@ -9,41 +9,48 @@ library on_generate_route;
 import 'package:flutter/material.dart';
 
 void main() {
-  runApp(Nav2App());
+  runApp(const Nav2App());
 }
 
 class Nav2App extends StatelessWidget {
+  const Nav2App({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
       onGenerateRoute: (settings) {
         // Handle '/'
         if (settings.name == '/') {
-          return MaterialPageRoute(builder: (context) => HomeScreen());
+          return MaterialPageRoute<void>(
+              builder: (context) => const HomeScreen());
         }
 
         // Handle '/details/:id'
-        var uri = Uri.parse(settings.name);
+        var uri = Uri.parse(settings.name ?? '');
         if (uri.pathSegments.length == 2 &&
             uri.pathSegments.first == 'details') {
           var id = uri.pathSegments[1];
-          return MaterialPageRoute(builder: (context) => DetailScreen(id: id));
+          return MaterialPageRoute<void>(
+              builder: (context) => DetailScreen(id: id));
         }
 
-        return MaterialPageRoute(builder: (context) => UnknownScreen());
+        return MaterialPageRoute<void>(
+            builder: (context) => const UnknownScreen());
       },
     );
   }
 }
 
 class HomeScreen extends StatelessWidget {
+  const HomeScreen({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(),
       body: Center(
         child: TextButton(
-          child: Text('View Details'),
+          child: const Text('View Details'),
           onPressed: () {
             Navigator.pushNamed(
               context,
@@ -59,9 +66,10 @@ class HomeScreen extends StatelessWidget {
 class DetailScreen extends StatelessWidget {
   final String id;
 
-  DetailScreen({
+  const DetailScreen({
-    this.id,
+    required this.id,
-  });
+    Key? key,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -73,7 +81,7 @@ class DetailScreen extends StatelessWidget {
           children: [
             Text('Viewing details for item $id'),
             TextButton(
-              child: Text('Pop!'),
+              child: const Text('Pop!'),
               onPressed: () {
                 Navigator.pop(context);
               },
@@ -86,11 +94,13 @@ class DetailScreen extends StatelessWidget {
 }
 
 class UnknownScreen extends StatelessWidget {
+  const UnknownScreen({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(),
-      body: Center(
+      body: const Center(
         child: Text('404!'),
       ),
     );

navigation_and_routing/old_snippets/router/pages.dart

@@ -8,7 +8,7 @@ library nav2_pages;
 import 'package:flutter/material.dart';
 
 void main() {
-  runApp(BooksApp());
+  runApp(const BooksApp());
 }
 
 class Book {
@@ -19,12 +19,14 @@ class Book {
 }
 
 class BooksApp extends StatefulWidget {
+  const BooksApp({Key? key}) : super(key: key);
+
   @override
   State<StatefulWidget> createState() => _BooksAppState();
 }
 
 class _BooksAppState extends State<BooksApp> {
-  Book _selectedBook;
+  Book? _selectedBook;
 
   final List<Book> books = [
     Book('Left Hand of Darkness', 'Ursula K. Le Guin'),
@@ -38,8 +40,8 @@ class _BooksAppState extends State<BooksApp> {
       title: 'Books App',
       home: Navigator(
         pages: [
-          MaterialPage(
+          MaterialPage<void>(
-            key: ValueKey('BooksListPage'),
+            key: const ValueKey('BooksListPage'),
             child: BooksListScreen(
               books: books,
               onTapped: _handleBookTapped,
@@ -47,7 +49,7 @@ class _BooksAppState extends State<BooksApp> {
           ),
           if (_selectedBook != null) BookDetailsPage(book: _selectedBook)
         ],
-        onPopPage: (route, result) {
+        onPopPage: (route, dynamic result) {
           if (!route.didPop(result)) {
             return false;
           }
@@ -70,17 +72,18 @@ class _BooksAppState extends State<BooksApp> {
   }
 }
 
-class BookDetailsPage extends Page {
+class BookDetailsPage extends Page<void> {
-  final Book book;
+  final Book? book;
 
   BookDetailsPage({
     this.book,
   }) : super(key: ValueKey(book));
 
+  @override
   Route createRoute(BuildContext context) {
-    return MaterialPageRoute(
+    return MaterialPageRoute<void>(
       settings: this,
-      builder: (BuildContext context) {
+      builder: (context) {
         return BookDetailsScreen(book: book);
       },
     );
@@ -91,10 +94,11 @@ class BooksListScreen extends StatelessWidget {
   final List<Book> books;
   final ValueChanged<Book> onTapped;
 
-  BooksListScreen({
+  const BooksListScreen({
-    @required this.books,
+    required this.books,
-    @required this.onTapped,
+    required this.onTapped,
-  });
+    Key? key,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -115,11 +119,12 @@ class BooksListScreen extends StatelessWidget {
 }
 
 class BookDetailsScreen extends StatelessWidget {
-  final Book book;
+  final Book? book;
 
-  BookDetailsScreen({
+  const BookDetailsScreen({
     @required this.book,
-  });
+    Key? key,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -131,8 +136,8 @@ class BookDetailsScreen extends StatelessWidget {
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
             if (book != null) ...[
-              Text(book.title, style: Theme.of(context).textTheme.headline6),
+              Text(book!.title, style: Theme.of(context).textTheme.headline6),
-              Text(book.author, style: Theme.of(context).textTheme.subtitle1),
+              Text(book!.author, style: Theme.of(context).textTheme.subtitle1),
             ],
           ],
         ),

navigation_and_routing/old_snippets/router/router.dart

@@ -9,7 +9,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
 void main() {
-  runApp(BooksApp());
+  runApp(const BooksApp());
 }
 
 class Book {
@@ -20,13 +20,15 @@ class Book {
 }
 
 class BooksApp extends StatefulWidget {
+  const BooksApp({Key? key}) : super(key: key);
+
   @override
   State<StatefulWidget> createState() => _BooksAppState();
 }
 
 class _BooksAppState extends State<BooksApp> {
-  BookRouterDelegate _routerDelegate = BookRouterDelegate();
+  final BookRouterDelegate _routerDelegate = BookRouterDelegate();
-  BookRouteInformationParser _routeInformationParser =
+  final BookRouteInformationParser _routeInformationParser =
       BookRouteInformationParser();
 
   @override
@@ -44,9 +46,9 @@ class BookRouteInformationParser extends RouteInformationParser<BookRoutePath> {
   Future<BookRoutePath> parseRouteInformation(
     RouteInformation routeInformation,
   ) {
-    final uri = Uri.parse(routeInformation.location);
+    final uri = Uri.parse(routeInformation.location ?? '');
     // Handle '/'
-    if (uri.pathSegments.length == 0) {
+    if (uri.pathSegments.isEmpty) {
       return SynchronousFuture(BookRoutePath.home());
     }
 
@@ -64,15 +66,15 @@ class BookRouteInformationParser extends RouteInformationParser<BookRoutePath> {
   }
 
   @override
-  RouteInformation restoreRouteInformation(BookRoutePath path) {
+  RouteInformation? restoreRouteInformation(BookRoutePath configuration) {
-    if (path.isUnknown) {
+    if (configuration.isUnknown) {
-      return RouteInformation(location: '/404');
+      return const RouteInformation(location: '/404');
     }
-    if (path.isHomePage) {
+    if (configuration.isHomePage) {
-      return RouteInformation(location: '/');
+      return const RouteInformation(location: '/');
     }
-    if (path.isDetailsPage) {
+    if (configuration.isDetailsPage) {
-      return RouteInformation(location: '/book/${path.id}');
+      return RouteInformation(location: '/book/${configuration.id}');
     }
     return null;
   }
@@ -80,9 +82,10 @@ class BookRouteInformationParser extends RouteInformationParser<BookRoutePath> {
 
 class BookRouterDelegate extends RouterDelegate<BookRoutePath>
     with ChangeNotifier, PopNavigatorRouterDelegateMixin<BookRoutePath> {
+  @override
   final GlobalKey<NavigatorState> navigatorKey;
 
-  Book _selectedBook;
+  Book? _selectedBook;
   bool show404 = false;
 
   final List<Book> books = [
@@ -93,13 +96,14 @@ class BookRouterDelegate extends RouterDelegate<BookRoutePath>
 
   BookRouterDelegate() : navigatorKey = GlobalKey<NavigatorState>();
 
+  @override
   BookRoutePath get currentConfiguration {
     if (show404) {
       return BookRoutePath.unknown();
     }
     return _selectedBook == null
         ? BookRoutePath.home()
-        : BookRoutePath.details(books.indexOf(_selectedBook));
+        : BookRoutePath.details(books.indexOf(_selectedBook!));
   }
 
   @override
@@ -107,19 +111,22 @@ class BookRouterDelegate extends RouterDelegate<BookRoutePath>
     return Navigator(
       key: navigatorKey,
       pages: [
-        MaterialPage(
+        MaterialPage<void>(
-          key: ValueKey('BooksListPage'),
+          key: const ValueKey('BooksListPage'),
           child: BooksListScreen(
             books: books,
             onTapped: _handleBookTapped,
           ),
         ),
         if (show404)
-          MaterialPage(key: ValueKey('UnknownPage'), child: UnknownScreen())
+          const MaterialPage<void>(
+            key: ValueKey('UnknownPage'),
+            child: UnknownScreen(),
+          )
         else if (_selectedBook != null)
-          BookDetailsPage(book: _selectedBook)
+          BookDetailsPage(book: _selectedBook!)
       ],
-      onPopPage: (route, result) {
+      onPopPage: (route, dynamic result) {
         if (!route.didPop(result)) {
           return false;
         }
@@ -135,20 +142,20 @@ class BookRouterDelegate extends RouterDelegate<BookRoutePath>
   }
 
   @override
-  Future<void> setNewRoutePath(BookRoutePath path) {
+  Future<void> setNewRoutePath(BookRoutePath configuration) {
-    if (path.isUnknown) {
+    if (configuration.isUnknown) {
       _selectedBook = null;
       show404 = true;
       return SynchronousFuture<void>(null);
     }
 
-    if (path.isDetailsPage) {
+    if (configuration.isDetailsPage) {
-      if (path.id < 0 || path.id > books.length - 1) {
+      if (configuration.id! < 0 || configuration.id! > books.length - 1) {
         show404 = true;
         return SynchronousFuture<void>(null);
       }
 
-      _selectedBook = books[path.id];
+      _selectedBook = books[configuration.id!];
     } else {
       _selectedBook = null;
     }
@@ -163,17 +170,18 @@ class BookRouterDelegate extends RouterDelegate<BookRoutePath>
   }
 }
 
-class BookDetailsPage extends Page {
+class BookDetailsPage extends Page<void> {
   final Book book;
 
   BookDetailsPage({
-    this.book,
+    required this.book,
   }) : super(key: ValueKey(book));
 
+  @override
   Route createRoute(BuildContext context) {
-    return MaterialPageRoute(
+    return MaterialPageRoute<void>(
       settings: this,
-      builder: (BuildContext context) {
+      builder: (context) {
         return BookDetailsScreen(book: book);
       },
     );
@@ -181,7 +189,7 @@ class BookDetailsPage extends Page {
 }
 
 class BookRoutePath {
-  final int id;
+  final int? id;
   final bool isUnknown;
 
   BookRoutePath.home()
@@ -203,10 +211,11 @@ class BooksListScreen extends StatelessWidget {
   final List<Book> books;
   final ValueChanged<Book> onTapped;
 
-  BooksListScreen({
+  const BooksListScreen({
-    @required this.books,
+    required this.books,
-    @required this.onTapped,
+    required this.onTapped,
-  });
+    Key? key,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -229,9 +238,10 @@ class BooksListScreen extends StatelessWidget {
 class BookDetailsScreen extends StatelessWidget {
   final Book book;
 
-  BookDetailsScreen({
+  const BookDetailsScreen({
-    @required this.book,
+    required this.book,
-  });
+    Key? key,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -242,10 +252,8 @@ class BookDetailsScreen extends StatelessWidget {
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            if (book != null) ...[
+            Text(book.title, style: Theme.of(context).textTheme.headline6),
-              Text(book.title, style: Theme.of(context).textTheme.headline6),
+            Text(book.author, style: Theme.of(context).textTheme.subtitle1),
-              Text(book.author, style: Theme.of(context).textTheme.subtitle1),
-            ],
           ],
         ),
       ),
@@ -254,11 +262,13 @@ class BookDetailsScreen extends StatelessWidget {
 }
 
 class UnknownScreen extends StatelessWidget {
+  const UnknownScreen({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(),
-      body: Center(
+      body: const Center(
         child: Text('404!'),
       ),
     );

navigation_and_routing/old_snippets/router_advanced/nested_router.dart

@@ -10,7 +10,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
 void main() {
-  runApp(NestedRouterDemo());
+  runApp(const NestedRouterDemo());
 }
 
 class Book {
@@ -21,13 +21,15 @@ class Book {
 }
 
 class NestedRouterDemo extends StatefulWidget {
+  const NestedRouterDemo({Key? key}) : super(key: key);
+
   @override
   _NestedRouterDemoState createState() => _NestedRouterDemoState();
 }
 
 class _NestedRouterDemoState extends State<NestedRouterDemo> {
-  BookRouterDelegate _routerDelegate = BookRouterDelegate();
+  final BookRouterDelegate _routerDelegate = BookRouterDelegate();
-  BookRouteInformationParser _routeInformationParser =
+  final BookRouteInformationParser _routeInformationParser =
       BookRouteInformationParser();
 
   @override
@@ -43,7 +45,7 @@ class _NestedRouterDemoState extends State<NestedRouterDemo> {
 class BooksAppState extends ChangeNotifier {
   int _selectedIndex;
 
-  Book _selectedBook;
+  Book? _selectedBook;
 
   final List<Book> books = [
     Book('Left Hand of Darkness', 'Ursula K. Le Guin'),
@@ -66,16 +68,17 @@ class BooksAppState extends ChangeNotifier {
     notifyListeners();
   }
 
-  Book get selectedBook => _selectedBook;
+  Book? get selectedBook => _selectedBook;
 
-  set selectedBook(Book book) {
+  set selectedBook(Book? book) {
     _selectedBook = book;
     notifyListeners();
   }
 
   int getSelectedBookById() {
+    if (_selectedBook == null) return 0;
     if (!books.contains(_selectedBook)) return 0;
-    return books.indexOf(_selectedBook);
+    return books.indexOf(_selectedBook!);
   }
 
   void setSelectedBookById(int id) {
@@ -93,14 +96,14 @@ class BookRouteInformationParser extends RouteInformationParser<BookRoutePath> {
   Future<BookRoutePath> parseRouteInformation(
     RouteInformation routeInformation,
   ) {
-    final uri = Uri.parse(routeInformation.location);
+    final uri = Uri.parse(routeInformation.location ?? '');
 
     if (uri.pathSegments.isNotEmpty && uri.pathSegments.first == 'settings') {
       return SynchronousFuture(BooksSettingsPath());
     } else {
       if (uri.pathSegments.length >= 2 && uri.pathSegments[0] == 'book') {
         return SynchronousFuture(
-          BooksDetailsPath(int.tryParse(uri.pathSegments[1])),
+          BooksDetailsPath(int.tryParse(uri.pathSegments[1])!),
         );
       }
       return SynchronousFuture(BooksListPath());
@@ -108,12 +111,12 @@ class BookRouteInformationParser extends RouteInformationParser<BookRoutePath> {
   }
 
   @override
-  RouteInformation restoreRouteInformation(BookRoutePath configuration) {
+  RouteInformation? restoreRouteInformation(BookRoutePath configuration) {
     if (configuration is BooksListPath) {
-      return RouteInformation(location: '/home');
+      return const RouteInformation(location: '/home');
     }
     if (configuration is BooksSettingsPath) {
-      return RouteInformation(location: '/settings');
+      return const RouteInformation(location: '/settings');
     }
     if (configuration is BooksDetailsPath) {
       return RouteInformation(location: '/book/${configuration.id}');
@@ -124,6 +127,7 @@ class BookRouteInformationParser extends RouteInformationParser<BookRoutePath> {
 
 class BookRouterDelegate extends RouterDelegate<BookRoutePath>
     with ChangeNotifier, PopNavigatorRouterDelegateMixin<BookRoutePath> {
+  @override
   final GlobalKey<NavigatorState> navigatorKey;
 
   BooksAppState appState = BooksAppState();
@@ -132,6 +136,7 @@ class BookRouterDelegate extends RouterDelegate<BookRoutePath>
     appState.addListener(notifyListeners);
   }
 
+  @override
   BookRoutePath get currentConfiguration {
     if (appState.selectedIndex == 1) {
       return BooksSettingsPath();
@@ -149,11 +154,11 @@ class BookRouterDelegate extends RouterDelegate<BookRoutePath>
     return Navigator(
       key: navigatorKey,
       pages: [
-        MaterialPage(
+        MaterialPage<void>(
           child: AppShell(appState: appState),
         ),
       ],
-      onPopPage: (route, result) {
+      onPopPage: (route, dynamic result) {
         if (!route.didPop(result)) {
           return false;
         }
@@ -168,14 +173,14 @@ class BookRouterDelegate extends RouterDelegate<BookRoutePath>
   }
 
   @override
-  Future<void> setNewRoutePath(BookRoutePath path) {
+  Future<void> setNewRoutePath(BookRoutePath configuration) {
-    if (path is BooksListPath) {
+    if (configuration is BooksListPath) {
       appState.selectedIndex = 0;
       appState.selectedBook = null;
-    } else if (path is BooksSettingsPath) {
+    } else if (configuration is BooksSettingsPath) {
       appState.selectedIndex = 1;
-    } else if (path is BooksDetailsPath) {
+    } else if (configuration is BooksDetailsPath) {
-      appState.setSelectedBookById(path.id);
+      appState.setSelectedBookById(configuration.id);
     }
     return SynchronousFuture<void>(null);
   }
@@ -198,18 +203,20 @@ class BooksDetailsPath extends BookRoutePath {
 class AppShell extends StatefulWidget {
   final BooksAppState appState;
 
-  AppShell({
+  const AppShell({
-    @required this.appState,
+    required this.appState,
-  });
+    Key? key,
+  }) : super(key: key);
 
   @override
   _AppShellState createState() => _AppShellState();
 }
 
 class _AppShellState extends State<AppShell> {
-  InnerRouterDelegate _routerDelegate;
+  late final InnerRouterDelegate _routerDelegate;
-  ChildBackButtonDispatcher _backButtonDispatcher;
+  late final ChildBackButtonDispatcher _backButtonDispatcher;
 
+  @override
   void initState() {
     super.initState();
     _routerDelegate = InnerRouterDelegate(widget.appState);
@@ -226,7 +233,7 @@ class _AppShellState extends State<AppShell> {
     super.didChangeDependencies();
     // Defer back button dispatching to the child router
     _backButtonDispatcher = Router.of(context)
-        .backButtonDispatcher
+        .backButtonDispatcher!
         .createChildBackButtonDispatcher();
   }
 
@@ -245,7 +252,7 @@ class _AppShellState extends State<AppShell> {
         backButtonDispatcher: _backButtonDispatcher,
       ),
       bottomNavigationBar: BottomNavigationBar(
-        items: [
+        items: const [
           BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'),
           BottomNavigationBarItem(
               icon: Icon(Icons.settings), label: 'Settings'),
@@ -261,9 +268,12 @@ class _AppShellState extends State<AppShell> {
 
 class InnerRouterDelegate extends RouterDelegate<BookRoutePath>
     with ChangeNotifier, PopNavigatorRouterDelegateMixin<BookRoutePath> {
+  @override
   final GlobalKey<NavigatorState> navigatorKey = GlobalKey<NavigatorState>();
+
   BooksAppState get appState => _appState;
   BooksAppState _appState;
+
   set appState(BooksAppState value) {
     if (value == _appState) {
       return;
@@ -285,20 +295,20 @@ class InnerRouterDelegate extends RouterDelegate<BookRoutePath>
               books: appState.books,
               onTapped: _handleBookTapped,
             ),
-            key: ValueKey('BooksListPage'),
+            key: const ValueKey('BooksListPage'),
           ),
           if (appState.selectedBook != null)
-            MaterialPage(
+            MaterialPage<void>(
               key: ValueKey(appState.selectedBook),
-              child: BookDetailsScreen(book: appState.selectedBook),
+              child: BookDetailsScreen(book: appState.selectedBook!),
             ),
         ] else
-          FadeAnimationPage(
+          const FadeAnimationPage(
             child: SettingsScreen(),
             key: ValueKey('SettingsPage'),
           ),
       ],
-      onPopPage: (route, result) {
+      onPopPage: (route, dynamic result) {
         appState.selectedBook = null;
         notifyListeners();
         return route.didPop(result);
@@ -307,7 +317,7 @@ class InnerRouterDelegate extends RouterDelegate<BookRoutePath>
   }
 
   @override
-  Future<void> setNewRoutePath(BookRoutePath path) {
+  Future<void> setNewRoutePath(BookRoutePath configuration) {
     // This is not required for inner router delegate because it does not
     // parse route
     assert(false);
@@ -320,13 +330,15 @@ class InnerRouterDelegate extends RouterDelegate<BookRoutePath>
   }
 }
 
-class FadeAnimationPage extends Page {
+class FadeAnimationPage extends Page<void> {
   final Widget child;
 
-  FadeAnimationPage({Key key, this.child}) : super(key: key);
+  const FadeAnimationPage({LocalKey? key, required this.child})
+      : super(key: key);
 
+  @override
   Route createRoute(BuildContext context) {
-    return PageRouteBuilder(
+    return PageRouteBuilder<void>(
       settings: this,
       pageBuilder: (context, animation, animation2) {
         var curveTween = CurveTween(curve: Curves.easeIn);
@@ -344,10 +356,11 @@ class BooksListScreen extends StatelessWidget {
   final List<Book> books;
   final ValueChanged<Book> onTapped;
 
-  BooksListScreen({
+  const BooksListScreen({
-    @required this.books,
+    required this.books,
-    @required this.onTapped,
+    required this.onTapped,
-  });
+    Key? key,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -369,9 +382,10 @@ class BooksListScreen extends StatelessWidget {
 class BookDetailsScreen extends StatelessWidget {
   final Book book;
 
-  BookDetailsScreen({
+  const BookDetailsScreen({
-    @required this.book,
+    required this.book,
-  });
+    Key? key,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -385,9 +399,9 @@ class BookDetailsScreen extends StatelessWidget {
               onPressed: () {
                 Navigator.of(context).pop();
               },
-              child: Text('Back'),
+              child: const Text('Back'),
             ),
-            if (book != null) ...[
+            ...[
               Text(book.title, style: Theme.of(context).textTheme.headline6),
               Text(book.author, style: Theme.of(context).textTheme.subtitle1),
             ],
@@ -399,9 +413,11 @@ class BookDetailsScreen extends StatelessWidget {
 }
 
 class SettingsScreen extends StatelessWidget {
+  const SettingsScreen({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
+    return const Scaffold(
       body: Center(
         child: Text('Settings screen'),
       ),

navigation_and_routing/old_snippets/router_advanced/transition_delegate.dart

@@ -10,7 +10,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
 void main() {
-  runApp(BooksApp());
+  runApp(const BooksApp());
 }
 
 class Book {
@@ -21,13 +21,15 @@ class Book {
 }
 
 class BooksApp extends StatefulWidget {
+  const BooksApp({Key? key}) : super(key: key);
+
   @override
   State<StatefulWidget> createState() => _BooksAppState();
 }
 
 class _BooksAppState extends State<BooksApp> {
-  BookRouterDelegate _routerDelegate = BookRouterDelegate();
+  final BookRouterDelegate _routerDelegate = BookRouterDelegate();
-  BookRouteInformationParser _routeInformationParser =
+  final BookRouteInformationParser _routeInformationParser =
       BookRouteInformationParser();
 
   @override
@@ -45,23 +47,23 @@ class BookRouteInformationParser extends RouteInformationParser<BookRoutePath> {
   Future<BookRoutePath> parseRouteInformation(
     RouteInformation routeInformation,
   ) {
-    final uri = Uri.parse(routeInformation.location);
+    final uri = Uri.parse(routeInformation.location ?? '');
 
     if (uri.pathSegments.length >= 2) {
       var remaining = uri.pathSegments[1];
-      return SynchronousFuture(BookRoutePath.details(int.tryParse(remaining)));
+      return SynchronousFuture(BookRoutePath.details(int.tryParse(remaining)!));
     } else {
       return SynchronousFuture(BookRoutePath.home());
     }
   }
 
   @override
-  RouteInformation restoreRouteInformation(BookRoutePath path) {
+  RouteInformation? restoreRouteInformation(BookRoutePath configuration) {
-    if (path.isHomePage) {
+    if (configuration.isHomePage) {
-      return RouteInformation(location: '/');
+      return const RouteInformation(location: '/');
     }
-    if (path.isDetailsPage) {
+    if (configuration.isDetailsPage) {
-      return RouteInformation(location: '/book/${path.id}');
+      return RouteInformation(location: '/book/${configuration.id}');
     }
     return null;
   }
@@ -69,9 +71,10 @@ class BookRouteInformationParser extends RouteInformationParser<BookRoutePath> {
 
 class BookRouterDelegate extends RouterDelegate<BookRoutePath>
     with ChangeNotifier, PopNavigatorRouterDelegateMixin<BookRoutePath> {
+  @override
   final GlobalKey<NavigatorState> navigatorKey;
 
-  Book _selectedBook;
+  Book? _selectedBook;
 
   final List<Book> books = [
     Book('Left Hand of Darkness', 'Ursula K. Le Guin'),
@@ -81,9 +84,10 @@ class BookRouterDelegate extends RouterDelegate<BookRoutePath>
 
   BookRouterDelegate() : navigatorKey = GlobalKey<NavigatorState>();
 
+  @override
   BookRoutePath get currentConfiguration => _selectedBook == null
       ? BookRoutePath.home()
-      : BookRoutePath.details(books.indexOf(_selectedBook));
+      : BookRoutePath.details(books.indexOf(_selectedBook!));
 
   @override
   Widget build(BuildContext context) {
@@ -91,16 +95,16 @@ class BookRouterDelegate extends RouterDelegate<BookRoutePath>
       key: navigatorKey,
       transitionDelegate: NoAnimationTransitionDelegate(),
       pages: [
-        MaterialPage(
+        MaterialPage<void>(
-          key: ValueKey('BooksListPage'),
+          key: const ValueKey('BooksListPage'),
           child: BooksListScreen(
             books: books,
             onTapped: _handleBookTapped,
           ),
         ),
-        if (_selectedBook != null) BookDetailsPage(book: _selectedBook)
+        if (_selectedBook != null) BookDetailsPage(book: _selectedBook!)
       ],
-      onPopPage: (route, result) {
+      onPopPage: (route, dynamic result) {
         if (!route.didPop(result)) {
           return false;
         }
@@ -115,9 +119,9 @@ class BookRouterDelegate extends RouterDelegate<BookRoutePath>
   }
 
   @override
-  Future<void> setNewRoutePath(BookRoutePath path) {
+  Future<void> setNewRoutePath(BookRoutePath configuration) {
-    if (path.isDetailsPage) {
+    if (configuration.isDetailsPage) {
-      _selectedBook = books[path.id];
+      _selectedBook = books[configuration.id!];
     }
     return SynchronousFuture<void>(null);
   }
@@ -128,17 +132,18 @@ class BookRouterDelegate extends RouterDelegate<BookRoutePath>
   }
 }
 
-class BookDetailsPage extends Page {
+class BookDetailsPage extends Page<void> {
   final Book book;
 
   BookDetailsPage({
-    this.book,
+    required this.book,
   }) : super(key: ValueKey(book));
 
+  @override
   Route createRoute(BuildContext context) {
-    return MaterialPageRoute(
+    return MaterialPageRoute<void>(
       settings: this,
-      builder: (BuildContext context) {
+      builder: (context) {
         return BookDetailsScreen(book: book);
       },
     );
@@ -146,7 +151,7 @@ class BookDetailsPage extends Page {
 }
 
 class BookRoutePath {
-  final int id;
+  final int? id;
 
   BookRoutePath.home() : id = null;
 
@@ -161,10 +166,11 @@ class BooksListScreen extends StatelessWidget {
   final List<Book> books;
   final ValueChanged<Book> onTapped;
 
-  BooksListScreen({
+  const BooksListScreen({
-    @required this.books,
+    required this.books,
-    @required this.onTapped,
+    required this.onTapped,
-  });
+    Key? key,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -187,9 +193,10 @@ class BooksListScreen extends StatelessWidget {
 class BookDetailsScreen extends StatelessWidget {
   final Book book;
 
-  BookDetailsScreen({
+  const BookDetailsScreen({
-    @required this.book,
+    required this.book,
-  });
+    Key? key,
+  }) : super(key: key);
 
   @override
   Widget build(BuildContext context) {
@@ -200,10 +207,8 @@ class BookDetailsScreen extends StatelessWidget {
         child: Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            if (book != null) ...[
+            Text(book.title, style: Theme.of(context).textTheme.headline6),
-              Text(book.title, style: Theme.of(context).textTheme.headline6),
+            Text(book.author, style: Theme.of(context).textTheme.subtitle1),
-              Text(book.author, style: Theme.of(context).textTheme.subtitle1),
-            ],
           ],
         ),
       ),
@@ -214,10 +219,10 @@ class BookDetailsScreen extends StatelessWidget {
 class NoAnimationTransitionDelegate extends TransitionDelegate<void> {
   @override
   Iterable<RouteTransitionRecord> resolve({
-    List<RouteTransitionRecord> newPageRouteHistory,
+    required List<RouteTransitionRecord> newPageRouteHistory,
-    Map<RouteTransitionRecord, RouteTransitionRecord>
+    required Map<RouteTransitionRecord?, RouteTransitionRecord>
         locationToExitingPageRoute,
-    Map<RouteTransitionRecord, List<RouteTransitionRecord>>
+    required Map<RouteTransitionRecord?, List<RouteTransitionRecord>>
         pageRouteToPagelessRoutes,
   }) {
     final results = <RouteTransitionRecord>[];

navigation_and_routing/pubspec.lock

@@ -1,6 +1,41 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  _fe_analyzer_shared:
+    dependency: transitive
+    description:
+      name: _fe_analyzer_shared
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "22.0.0"
+  adaptive_breakpoints:
+    dependency: transitive
+    description:
+      name: adaptive_breakpoints
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.4"
+  adaptive_navigation:
+    dependency: "direct main"
+    description:
+      name: adaptive_navigation
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.0.3"
+  analyzer:
+    dependency: transitive
+    description:
+      name: analyzer
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.7.1"
+  args:
+    dependency: transitive
+    description:
+      name: args
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.1"
   async:
     dependency: transitive
     description:
@@ -29,6 +64,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
+  cli_util:
+    dependency: transitive
+    description:
+      name: cli_util
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.0"
   clock:
     dependency: transitive
     description:
@@ -37,12 +79,33 @@ packages:
     source: hosted
     version: "1.1.0"
   collection:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: collection
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.15.0"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.0"
+  coverage:
+    dependency: transitive
+    description:
+      name: coverage
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.3"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.1"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -57,16 +120,84 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.1.1"
   flutter:
     dependency: "direct main"
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.3"
   flutter_test:
     dependency: "direct dev"
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  glob:
+    dependency: transitive
+    description:
+      name: glob
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.1"
+  http_multi_server:
+    dependency: transitive
+    description:
+      name: http_multi_server
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.1"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.0.0"
+  io:
+    dependency: transitive
+    description:
+      name: io
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.6.3"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.1"
+  logging:
+    dependency: transitive
+    description:
+      name: logging
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.1"
   matcher:
     dependency: transitive
     description:
@@ -81,6 +212,27 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.0"
+  mime:
+    dependency: transitive
+    description:
+      name: mime
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0"
+  node_preamble:
+    dependency: transitive
+    description:
+      name: node_preamble
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  package_config:
+    dependency: transitive
+    description:
+      name: package_config
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
   path:
     dependency: transitive
     description:
@@ -88,11 +240,95 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0"
+  path_to_regexp:
+    dependency: "direct main"
+    description:
+      name: path_to_regexp
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.4.0"
+  pedantic:
+    dependency: transitive
+    description:
+      name: pedantic
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.11.0"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  pool:
+    dependency: transitive
+    description:
+      name: pool
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.5.0"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  quiver:
+    dependency: "direct main"
+    description:
+      name: quiver
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.1"
+  shelf:
+    dependency: transitive
+    description:
+      name: shelf
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.4"
+  shelf_packages_handler:
+    dependency: transitive
+    description:
+      name: shelf_packages_handler
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.0"
+  shelf_static:
+    dependency: transitive
+    description:
+      name: shelf_static
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0"
+  shelf_web_socket:
+    dependency: transitive
+    description:
+      name: shelf_web_socket
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.1"
   sky_engine:
     dependency: transitive
     description: flutter
     source: sdk
     version: "0.0.99"
+  source_map_stack_trace:
+    dependency: transitive
+    description:
+      name: source_map_stack_trace
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.0"
+  source_maps:
+    dependency: transitive
+    description:
+      name: source_maps
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.10.10"
   source_span:
     dependency: transitive
     description:
@@ -128,6 +364,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
+  test:
+    dependency: "direct dev"
+    description:
+      name: test
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.16.8"
   test_api:
     dependency: transitive
     description:
@@ -135,6 +378,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.3.0"
+  test_core:
+    dependency: transitive
+    description:
+      name: test_core
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.19"
   typed_data:
     dependency: transitive
     description:
@@ -142,6 +392,55 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.0"
+  url_launcher:
+    dependency: "direct main"
+    description:
+      name: url_launcher
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.0.6"
+  url_launcher_linux:
+    dependency: transitive
+    description:
+      name: url_launcher_linux
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  url_launcher_macos:
+    dependency: transitive
+    description:
+      name: url_launcher_macos
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  url_launcher_platform_interface:
+    dependency: transitive
+    description:
+      name: url_launcher_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.3"
+  url_launcher_web:
+    dependency: transitive
+    description:
+      name: url_launcher_web
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.1"
+  url_launcher_windows:
+    dependency: transitive
+    description:
+      name: url_launcher_windows
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  url_strategy:
+    dependency: "direct main"
+    description:
+      name: url_strategy
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.0"
   vector_math:
     dependency: transitive
     description:
@@ -149,5 +448,41 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.2.0"
+  watcher:
+    dependency: transitive
+    description:
+      name: watcher
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0"
+  web_socket_channel:
+    dependency: transitive
+    description:
+      name: web_socket_channel
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.0"
+  webkit_inspection_protocol:
+    dependency: transitive
+    description:
+      name: webkit_inspection_protocol
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0"
+  yaml:
+    dependency: transitive
+    description:
+      name: yaml
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.1.0"
 sdks:
   dart: ">=2.12.0 <3.0.0"
+  flutter: ">=2.0.0"

navigation_and_routing/pubspec.yaml

@@ -1,20 +1,23 @@
-name: navigation_and_routing
+name: bookstore
-description: Navigation and routing samples
+description: Navigation and routing sample app
-publish_to: 'none'
+publish_to: 'none' # Remove this line if you wish to publish to pub.dev
-
 version: 1.0.0+1
-
 environment:
-  sdk: ">=2.10.0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
-
 dependencies:
   flutter:
     sdk: flutter
-  cupertino_icons: ^1.0.0
+  cupertino_icons: ^1.0.2
-
+  quiver: ^3.0.0
+  path_to_regexp: ^0.4.0
+  adaptive_navigation: ^0.0.3
+  collection: ^1.15.0
+  url_launcher: ^6.0.0
+  url_strategy: ^0.2.0
 dev_dependencies:
+  test: ^1.16.0
   flutter_test:
     sdk: flutter
-
+  flutter_lints: ^1.0.0
 flutter:
   uses-material-design: true

navigation_and_routing/test/library_test.dart

@@ -0,0 +1,22 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:bookstore/src/data/library.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('Library', () {
+    test('addBook', () {
+      final library = Library();
+      library.addBook('Left Hand of Darkness', 'Ursula K. Le Guin', true, true);
+      library.addBook('Too Like the Lightning', 'Ada Palmer', false, true);
+      library.addBook('Kindred', 'Octavia E. Butler', true, false);
+      library.addBook('The Lathe of Heaven', 'Ursula K. Le Guin', false, false);
+      expect(library.allAuthors.length, 3);
+      expect(library.allAuthors.first.books.length, 2);
+      expect(library.allBooks.length, 4);
+      expect(library.allBooks.first.author.name, startsWith('Ursula'));
+    });
+  });
+}

navigation_and_routing/test/widget_test.dart

@@ -0,0 +1,9 @@
+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('empty test', (tester) async {});
+}

navigation_and_routing/web/index.html

@@ -0,0 +1,98 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <!--
+    If you are serving your web app in a path other than the root, change the
+    href value below to reflect the base path you are serving from.
+
+    The path provided below has to start and end with a slash "/" in order for
+    it to work correctly.
+
+    For more details:
+    * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
+  -->
+  <base href="/">
+
+  <meta charset="UTF-8">
+  <meta content="IE=Edge" http-equiv="X-UA-Compatible">
+  <meta name="description" content="Navigation and routing sample app">
+
+  <!-- iOS meta tags & icons -->
+  <meta name="apple-mobile-web-app-capable" content="yes">
+  <meta name="apple-mobile-web-app-status-bar-style" content="black">
+  <meta name="apple-mobile-web-app-title" content="bookstore">
+  <link rel="apple-touch-icon" href="icons/Icon-192.png">
+
+  <title>bookstore</title>
+  <link rel="manifest" href="manifest.json">
+</head>
+<body>
+  <!-- This script installs service_worker.js to provide PWA functionality to
+       application. For more information, see:
+       https://developers.google.com/web/fundamentals/primers/service-workers -->
+  <script>
+    var serviceWorkerVersion = null;
+    var scriptLoaded = false;
+    function loadMainDartJs() {
+      if (scriptLoaded) {
+        return;
+      }
+      scriptLoaded = true;
+      var scriptTag = document.createElement('script');
+      scriptTag.src = 'main.dart.js';
+      scriptTag.type = 'application/javascript';
+      document.body.append(scriptTag);
+    }
+
+    if ('serviceWorker' in navigator) {
+      // Service workers are supported. Use them.
+      window.addEventListener('load', function () {
+        // Wait for registration to finish before dropping the <script> tag.
+        // Otherwise, the browser will load the script multiple times,
+        // potentially different versions.
+        var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;
+        navigator.serviceWorker.register(serviceWorkerUrl)
+          .then((reg) => {
+            function waitForActivation(serviceWorker) {
+              serviceWorker.addEventListener('statechange', () => {
+                if (serviceWorker.state == 'activated') {
+                  console.log('Installed new service worker.');
+                  loadMainDartJs();
+                }
+              });
+            }
+            if (!reg.active && (reg.installing || reg.waiting)) {
+              // No active web worker and we have installed or are installing
+              // one for the first time. Simply wait for it to activate.
+              waitForActivation(reg.installing ?? reg.waiting);
+            } else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
+              // When the app updates the serviceWorkerVersion changes, so we
+              // need to ask the service worker to update.
+              console.log('New service worker available.');
+              reg.update();
+              waitForActivation(reg.installing);
+            } else {
+              // Existing service worker is still good.
+              console.log('Loading app from service worker.');
+              loadMainDartJs();
+            }
+          });
+
+        // If service worker doesn't succeed in a reasonable amount of time,
+        // fallback to plaint <script> tag.
+        setTimeout(() => {
+          if (!scriptLoaded) {
+            console.warn(
+              'Failed to load app from service worker. Falling back to plain <script> tag.',
+            );
+            loadMainDartJs();
+          }
+        }, 4000);
+      });
+    } else {
+      // Service workers not supported. Just drop the <script> tag.
+      loadMainDartJs();
+    }
+  </script>
+</body>
+</html>

navigation_and_routing/web/manifest.json

@@ -0,0 +1,23 @@
+{
+    "name": "bookstore",
+    "short_name": "bookstore",
+    "start_url": ".",
+    "display": "standalone",
+    "background_color": "#0175C2",
+    "theme_color": "#0175C2",
+    "description": "Navigation and routing sample app",
+    "orientation": "portrait-primary",
+    "prefer_related_applications": false,
+    "icons": [
+        {
+            "src": "icons/Icon-192.png",
+            "sizes": "192x192",
+            "type": "image/png"
+        },
+        {
+            "src": "icons/Icon-512.png",
+            "sizes": "512x512",
+            "type": "image/png"
+        }
+    ]
+}

web/_tool/.copyright

@@ -0,0 +1,3 @@
+// Copyright {{ year }} The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file