Adding Support for Desktop

lib/main.dart

@@ -1,6 +1,8 @@
 import 'dart:async';
+import 'dart:io';
 import 'dart:ui' as ui;
-
+import 'package:flutter/foundation.dart'
+    show debugDefaultTargetPlatformOverride;
 import 'package:dev_rpg/src/about_screen.dart';
 import 'package:dev_rpg/src/code_chomper/code_chomper.dart';
 import 'package:dev_rpg/src/game_screen.dart';
@@ -22,10 +24,25 @@ void main() {
   // Don't prune the Flare cache, keep loaded Flare files warm and ready
   // to be re-displayed.
   FlareCache.doesPrune = false;
-
+  _setTargetPlatformForDesktop();
   runApp(MyApp());
 }
 
+/// If the current platform is desktop, override the default platform to
+/// a supported platform (iOS for macOS, Android for Linux and Windows).
+/// Otherwise, do nothing.
+void _setTargetPlatformForDesktop() {
+  TargetPlatform targetPlatform;
+  if (Platform.isMacOS) {
+    targetPlatform = TargetPlatform.iOS;
+  } else if (Platform.isLinux || Platform.isWindows) {
+    targetPlatform = TargetPlatform.android;
+  }
+  if (targetPlatform != null) {
+    debugDefaultTargetPlatformOverride = targetPlatform;
+  }
+}
+
 class MyApp extends StatefulWidget {
   @override
   _MyAppState createState() => _MyAppState();

linux/.gitignore

@@ -0,0 +1 @@
+.generated_flutter_root

linux/Makefile

@@ -0,0 +1,143 @@
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Example-specific variables.
+# To modify this Makefile for a different application, these are the values
+# that are mostly likely to need to be changed.
+
+# Executable name.
+BINARY_NAME=flutter_desktop_example
+# The C++ code for the embedder application.
+SOURCES=flutter_embedder_example.cc
+
+
+# Default build type. For a release build, set BUILD=release.
+# Currently this only sets NDEBUG, which is used to control the flags passed
+# to the Flutter engine in the example shell, and not the complation settings
+# (e.g., optimization level) of the C++ code.
+BUILD=debug
+
+# Dependency locations
+FLUTTER_APP_DIR=$(CURDIR)/..
+FLUTTER_APP_BUILD_DIR=$(FLUTTER_APP_DIR)/build
+FLUTTER_ROOT:=$(shell cat $(CURDIR)/.generated_flutter_root)
+FLUTTER_ARTIFACT_CACHE_DIR=$(FLUTTER_ROOT)/bin/cache/artifacts/engine/linux-x64
+
+OUT_DIR=$(FLUTTER_APP_BUILD_DIR)/linux
+CACHE_DIR=$(OUT_DIR)/cache
+FLUTTER_LIBRARY_COPY_DIR=$(CACHE_DIR)/flutter_library
+
+FLUTTER_LIB_NAME=flutter_linux
+FLUTTER_LIB=$(FLUTTER_LIBRARY_COPY_DIR)/lib$(FLUTTER_LIB_NAME).so
+
+# Tools
+FLUTTER_BIN=$(FLUTTER_ROOT)/bin/flutter
+
+# Resources
+ICU_DATA_NAME=icudtl.dat
+ICU_DATA_SOURCE=$(FLUTTER_ARTIFACT_CACHE_DIR)/$(ICU_DATA_NAME)
+FLUTTER_ASSETS_NAME=flutter_assets
+FLUTTER_ASSETS_SOURCE=$(FLUTTER_APP_BUILD_DIR)/$(FLUTTER_ASSETS_NAME)
+
+# Bundle structure
+BUNDLE_OUT_DIR=$(OUT_DIR)/$(BUILD)
+BUNDLE_DATA_DIR=$(BUNDLE_OUT_DIR)/data
+BUNDLE_LIB_DIR=$(BUNDLE_OUT_DIR)/lib
+
+BIN_OUT=$(BUNDLE_OUT_DIR)/$(BINARY_NAME)
+ICU_DATA_OUT=$(BUNDLE_DATA_DIR)/$(ICU_DATA_NAME)
+FLUTTER_LIB_OUT=$(BUNDLE_LIB_DIR)/$(notdir $(FLUTTER_LIB))
+
+# Add relevant code from the wrapper library, which is intended to be statically
+# built into the client.
+WRAPPER_ROOT=$(FLUTTER_LIBRARY_COPY_DIR)/cpp_client_wrapper
+WRAPPER_SOURCES= \
+	$(WRAPPER_ROOT)/flutter_window_controller.cc \
+	$(WRAPPER_ROOT)/plugin_registrar.cc \
+	$(WRAPPER_ROOT)/engine_method_result.cc
+SOURCES+=$(WRAPPER_SOURCES)
+
+# Headers
+WRAPPER_INCLUDE_DIR=$(WRAPPER_ROOT)/include
+INCLUDE_DIRS=$(FLUTTER_LIBRARY_COPY_DIR) $(WRAPPER_INCLUDE_DIR)
+
+# The stamp file created by copy_flutter_files.
+FLUTTER_COPY_STAMP_FILE=$(FLUTTER_LIBRARY_COPY_DIR)/.last_copied_flutter_version
+# The Flutter engine version file.
+FLUTTER_ENGINE_VERSION_FILE=$(FLUTTER_ROOT)/bin/internal/engine.version
+
+# Build settings
+CXX=g++ -std=c++14
+CXXFLAGS.release=-DNDEBUG
+CXXFLAGS=-Wall -Werror $(CXXFLAGS.$(BUILD))
+CPPFLAGS=$(patsubst %,-I%,$(INCLUDE_DIRS))
+LDFLAGS=-L$(BUNDLE_LIB_DIR) \
+	-l$(FLUTTER_LIB_NAME) \
+	-Wl,-rpath=\$$ORIGIN/lib
+
+# Targets
+
+.PHONY: all
+all: $(BIN_OUT) bundle
+
+.PHONY: bundle
+bundle: $(ICU_DATA_OUT) $(FLUTTER_LIB_OUT) bundleflutterassets
+
+$(BIN_OUT): $(SOURCES) $(FLUTTER_LIB_OUT)
+	mkdir -p $(@D)
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(SOURCES) $(LDFLAGS) -o $@
+
+$(WRAPPER_SOURCES) $(FLUTTER_LIB) $(ICU_DATA_SOURCE): $(FLUTTER_COPY_STAMP_FILE)
+
+# When the Flutter engine version changes, the local copy of engine artifacts
+# needs to be updated.
+$(FLUTTER_COPY_STAMP_FILE): $(FLUTTER_ENGINE_VERSION_FILE)
+	$(FLUTTER_BIN) precache --linux --no-android --no-ios
+	rm -rf $(FLUTTER_LIBRARY_COPY_DIR)
+	mkdir -p $(FLUTTER_LIBRARY_COPY_DIR)
+	cp $(FLUTTER_ARTIFACT_CACHE_DIR)/*.h $(FLUTTER_LIBRARY_COPY_DIR)/
+	cp $(FLUTTER_ARTIFACT_CACHE_DIR)/*.so $(FLUTTER_LIBRARY_COPY_DIR)/
+	cp -r $(FLUTTER_ARTIFACT_CACHE_DIR)/cpp_client_wrapper \
+		$(FLUTTER_LIBRARY_COPY_DIR)/
+	touch $(FLUTTER_COPY_STAMP_FILE)
+
+$(FLUTTER_LIB_OUT): $(FLUTTER_LIB)
+	mkdir -p $(BUNDLE_LIB_DIR)
+	cp $(FLUTTER_LIB) $(BUNDLE_LIB_DIR)
+
+$(ICU_DATA_OUT): $(ICU_DATA_SOURCE)
+	mkdir -p $(dir $(ICU_DATA_OUT))
+	cp $(ICU_DATA_SOURCE) $(ICU_DATA_OUT)
+
+# Fully re-copy the assets directory on each build to avoid having to keep a
+# comprehensive list of all asset files here, which would be fragile to changes
+# in the Flutter example (e.g., adding a new font to pubspec.yaml would require
+# changes here).
+.PHONY: bundleflutterassets
+bundleflutterassets: $(FLUTTER_ASSETS_SOURCE)
+	mkdir -p $(BUNDLE_DATA_DIR)
+	rsync -rpu --delete $(FLUTTER_ASSETS_SOURCE) $(BUNDLE_DATA_DIR)
+
+# PHONY since the Makefile doesn't have all the dependency information necessary
+# to know if 'build bundle' needs to be re-run.
+.PHONY: $(FLUTTER_ASSETS_SOURCE)
+$(FLUTTER_ASSETS_SOURCE):
+	cd $(FLUTTER_APP_DIR); \
+	$(FLUTTER_BIN) build bundle $(FLUTTER_BUNDLE_FLAGS)
+
+.PHONY: clean
+clean:
+	rm -rf $(OUT_DIR); \
+	cd $(FLUTTER_APP_DIR); \
+	$(FLUTTER_BIN) clean

linux/flutter_embedder_example.cc

@@ -0,0 +1,74 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#include <linux/limits.h>
+#include <unistd.h>
+
+#include <cstdlib>
+#include <iostream>
+#include <memory>
+#include <vector>
+
+#include <flutter/flutter_window_controller.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;
+#ifdef NDEBUG
+  arguments.push_back("--disable-dart-asserts");
+#endif
+
+  flutter::FlutterWindowController flutter_controller(icu_data_path);
+
+  // Start the engine.
+  if (!flutter_controller.CreateWindow(800, 600, "Flutter Desktop Example",
+                                       assets_path, arguments)) {
+    return EXIT_FAILURE;
+  }
+
+  // Run until the window is closed.
+  flutter_controller.RunEventLoop();
+  return EXIT_SUCCESS;
+}

macos/.gitignore

@@ -0,0 +1,4 @@
+xcuserdata
+
+# Generated by flutter run and flutter build
+Generated.xcconfig

macos/AppDelegate.swift

@@ -0,0 +1,25 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import Cocoa
+
+@NSApplicationMain
+class AppDelegate: NSObject, NSApplicationDelegate {
+  @IBOutlet weak var window: NSWindow!
+
+  func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
+    return true
+  }
+}
+

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

@@ -0,0 +1,58 @@
+{
+  "images" : [
+    {
+      "idiom" : "mac",
+      "size" : "16x16",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "16x16",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "32x32",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "32x32",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "128x128",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "128x128",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "256x256",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "256x256",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "512x512",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "mac",
+      "size" : "512x512",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}