[Gallery] Fix directory structure (#312)

gallery/linux/main.cc

@@ -0,0 +1,70 @@
+// Copyright 2019 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.
+
+#include <flutter/flutter_window_controller.h>
+#include <linux/limits.h>
+#include <unistd.h>
+
+#include <cstdlib>
+#include <iostream>
+#include <memory>
+#include <vector>
+
+#include "flutter/generated_plugin_registrant.h"
+
+namespace {
+
+// Returns the path of the directory containing this executable, or an empty
+// string if the directory cannot be found.
+std::string GetExecutableDirectory() {
+  char buffer[PATH_MAX + 1];
+  ssize_t length = readlink("/proc/self/exe", buffer, sizeof(buffer));
+  if (length > PATH_MAX) {
+    std::cerr << "Couldn't locate executable" << std::endl;
+    return "";
+  }
+  std::string executable_path(buffer, length);
+  size_t last_separator_position = executable_path.find_last_of('/');
+  if (last_separator_position == std::string::npos) {
+    std::cerr << "Unabled to find parent directory of " << executable_path
+              << std::endl;
+    return "";
+  }
+  return executable_path.substr(0, last_separator_position);
+}
+
+}  // namespace
+
+int main(int argc, char **argv) {
+  // Resources are located relative to the executable.
+  std::string base_directory = GetExecutableDirectory();
+  if (base_directory.empty()) {
+    base_directory = ".";
+  }
+  std::string data_directory = base_directory + "/data";
+  std::string assets_path = data_directory + "/flutter_assets";
+  std::string icu_data_path = data_directory + "/icudtl.dat";
+
+  // Arguments for the Flutter Engine.
+  std::vector<std::string> arguments;
+
+  flutter::FlutterWindowController flutter_controller(icu_data_path);
+  flutter::WindowProperties window_properties = {};
+  window_properties.title = "Flutter Gallery";
+  window_properties.width = 800;
+  window_properties.height = 600;
+
+  // Start the engine.
+  if (!flutter_controller.CreateWindow(window_properties, assets_path,
+                                       arguments)) {
+    return EXIT_FAILURE;
+  }
+  RegisterPlugins(&flutter_controller);
+
+  // Run until the window is closed.
+  while (flutter_controller.RunEventLoopWithTimeout(
+      std::chrono::milliseconds::max())) {
+  }
+  return EXIT_SUCCESS;
+}