[Gallery] Modify desktop layout for crane when running in "Small desktop" size (#293)

gallery/gallery/lib/layout/adaptive.dart

@@ -10,6 +10,7 @@ enum DisplayType {
 }
 
 const _desktopBreakpoint = 700.0;
+const _smallDesktopMaxWidth = 1000.0;
 
 /// Returns the [DisplayType] for the current screen. This app only supports
 /// mobile and desktop layouts, and as such we only have one breakpoint.
@@ -26,3 +27,10 @@ DisplayType displayTypeOf(BuildContext context) {
 bool isDisplayDesktop(BuildContext context) {
   return displayTypeOf(context) == DisplayType.desktop;
 }
+
+/// Returns a boolean if we are in a display of [DisplayType.desktop] but less
+/// than 1000 width. Used to build adaptive and responsive layouts.
+bool isDisplaySmallDesktop(BuildContext context) {
+  return isDisplayDesktop(context) &&
+      MediaQuery.of(context).size.width < _smallDesktopMaxWidth;
+}

gallery/gallery/lib/studies/crane/backdrop.dart

@@ -15,6 +15,7 @@ import 'package:gallery/layout/adaptive.dart';
 import 'package:gallery/studies/crane/border_tab_indicator.dart';
 import 'package:gallery/studies/crane/backlayer.dart';
 import 'package:gallery/studies/crane/colors.dart';
+import 'package:gallery/studies/crane/header_form.dart';
 import 'package:gallery/studies/crane/item_cards.dart';
 
 class _FrontLayer extends StatelessWidget {
@@ -32,6 +33,7 @@ class _FrontLayer extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final isDesktop = isDisplayDesktop(context);
+    final isSmallDesktop = isDisplaySmallDesktop(context);
 
     return DefaultFocusTraversal(
       policy: ReadingOrderTraversalPolicy(),
@@ -48,7 +50,10 @@ class _FrontLayer extends StatelessWidget {
         ),
         child: ListView(
           padding: isDesktop
-              ? EdgeInsets.symmetric(horizontal: 120, vertical: 22)
+              ? EdgeInsets.symmetric(
+                  horizontal:
+                      isSmallDesktop ? appPaddingSmall : appPaddingLarge,
+                  vertical: 22)
               : EdgeInsets.all(20),
           children: [
             Text(title, style: Theme.of(context).textTheme.subtitle),
@@ -152,7 +157,10 @@ class _BackdropState extends State<Backdrop> with TickerProviderStateMixin {
                   Container(
                     margin: EdgeInsets.only(
                       top: isDesktop
-                          ? 60 + 20 * textScaleFactor / 2
+                          ? (isDisplaySmallDesktop(context)
+                                  ? textFieldHeight * 2
+                                  : textFieldHeight) +
+                              20 * textScaleFactor / 2
                           : 175 + 140 * textScaleFactor / 2,
                     ),
                     child: TabBarView(
@@ -213,11 +221,15 @@ class _CraneAppBarState extends State<CraneAppBar> {
   @override
   Widget build(BuildContext context) {
     final isDesktop = isDisplayDesktop(context);
+    final isSmallDesktop = isDisplaySmallDesktop(context);
     final textScaleFactor = GalleryOptions.of(context).textScaleFactor(context);
 
     return SafeArea(
       child: Padding(
-        padding: EdgeInsets.symmetric(horizontal: isDesktop ? 120 : 24),
+        padding: EdgeInsets.symmetric(
+          horizontal:
+              isDesktop && !isSmallDesktop ? appPaddingLarge : appPaddingSmall,
+        ),
         child: Row(
           mainAxisAlignment: MainAxisAlignment.spaceEvenly,
           crossAxisAlignment: CrossAxisAlignment.center,

gallery/gallery/lib/studies/crane/header_form.dart

@@ -6,6 +6,10 @@ import 'package:flutter/material.dart';
 import 'package:gallery/layout/adaptive.dart';
 import 'package:gallery/studies/crane/colors.dart';
 
+const textFieldHeight = 60.0;
+const appPaddingLarge = 120.0;
+const appPaddingSmall = 24.0;
+
 class HeaderFormField {
   final IconData iconData;
   final String title;
@@ -22,21 +26,32 @@ class HeaderForm extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final isDesktop = isDisplayDesktop(context);
-
+    final isSmallDesktop = isDisplaySmallDesktop(context);
     return Padding(
-      padding: EdgeInsets.symmetric(horizontal: isDesktop ? 120 : 24),
+      padding: EdgeInsets.symmetric(
+        horizontal:
+            isDesktop && !isSmallDesktop ? appPaddingLarge : appPaddingSmall,
+      ),
       child: isDesktop
-          ? Row(
-              children: [
-                for (final field in fields)
-                  Flexible(
-                    child: Padding(
+          ? LayoutBuilder(builder: (context, constraints) {
+              var crossAxisCount = isSmallDesktop ? 2 : 4;
+              if (fields.length < crossAxisCount) {
+                crossAxisCount = fields.length;
+              }
+              final itemWidth = constraints.maxWidth / crossAxisCount;
+              return GridView.count(
+                crossAxisCount: crossAxisCount,
+                childAspectRatio: itemWidth / textFieldHeight,
+                physics: NeverScrollableScrollPhysics(),
+                children: [
+                  for (final field in fields)
+                    Padding(
                       padding: const EdgeInsetsDirectional.only(end: 16),
                       child: _HeaderTextField(field: field),
-                    ),
-                  )
-              ],
-            )
+                    )
+                ],
+              );
+            })
           : Column(
               mainAxisSize: MainAxisSize.min,
               children: [