Add simple desktop app

desktop/.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+pubspec.lock
+.pub-cache/
+.pub/
+/build/
+
+# Web related
+lib/generated_plugin_registrant.dart
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Exceptions to above rules.
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

desktop/.metadata

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+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: f25bd9c55c48c139524139b477d04b13e9f36b2c
+  channel: dev
+
+project_type: app

desktop/lib/main.dart

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+import 'package:flutter/widgets.dart';
+import 'package:musicus_common/musicus_common.dart';
+import 'package:path/path.dart' as p;
+import 'package:path_provider/path_provider.dart' as pp;
+
+import 'settings.dart';
+import 'platform.dart';
+import 'playback.dart';
+
+Future<void> main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+
+  final dir = await pp.getApplicationSupportDirectory();
+  final dbPath = p.join(dir.path, 'db.sqlite');
+
+  runApp(MusicusApp(
+    dbPath: dbPath,
+    settingsStorage: SettingsStorage(),
+    platform: MusicusDesktopPlatform(),
+    playback: MusicusDesktopPlayback(),
+  ));
+}

desktop/lib/platform.dart

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+import 'dart:io';
+
+import 'package:file_chooser/file_chooser.dart';
+import 'package:musicus_common/musicus_common.dart';
+import 'package:path/path.dart' as p;
+
+class MusicusDesktopPlatform extends MusicusPlatform {
+  @override
+  Future<String> chooseBasePath() async {
+    final result = await showOpenPanel(
+      canSelectDirectories: true,
+    );
+
+    if (result != null && !result.canceled) {
+      return result.paths.first;
+    } else {
+      return null;
+    }
+  }
+
+  @override
+  Future<List<Document>> getChildren(String parentId) async {
+    final List<Document> result = [];
+
+    final parent = Directory(parentId ?? basePath);
+    await for (final fse in parent.list()) {
+      result.add(Document(
+        id: fse.path,
+        name: p.basename(fse.path),
+        parent: parentId,
+        isDirectory: fse is Directory,
+      ));
+    }
+
+    return result;
+  }
+
+  @override
+  Future<String> getIdentifier(String parentId, String fileName) async {
+    return p.absolute(parentId, fileName);
+  }
+
+  @override
+  Future<String> readDocument(String id) async {
+    try {
+      return await File(id).readAsString();
+    } on FileSystemException {
+      return null;
+    }
+  }
+
+  @override
+  Future<String> readDocumentByName(String parentId, String fileName) async {
+    try {
+      return await File(p.absolute(parentId, fileName)).readAsString();
+    } on FileSystemException {
+      return null;
+    }
+  }
+
+  @override
+  Future<void> writeDocumentByName(
+      String parentId, String fileName, String contents) async {
+    await File(p.absolute(parentId, fileName)).writeAsString(contents);
+  }
+}

desktop/lib/playback.dart

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+import 'package:musicus_common/musicus_common.dart';
+
+class MusicusDesktopPlayback extends MusicusPlayback {
+  @override
+  Future<void> addTracks(List<InternalTrack> tracks) async {
+    // TODO: implement addTracks
+  }
+
+  @override
+  Future<void> playPause() async {
+    // TODO: implement playPause
+  }
+
+  @override
+  Future<void> removeTrack(int index) async {
+    // TODO: implement removeTrack
+  }
+
+  @override
+  Future<void> seekTo(double pos) async {
+    // TODO: implement seekTo
+  }
+
+  @override
+  Future<void> setup() async {
+    // TODO: implement setup
+  }
+
+  @override
+  Future<void> skipTo(int index) async {
+    // TODO: implement skipTo
+  }
+
+  @override
+  Future<void> skipToNext() async {
+    // TODO: implement skipToNext
+  }
+
+  @override
+  Future<void> skipToPrevious() async {
+    // TODO: implement skipToPrevious
+  }
+}

desktop/lib/settings.dart

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+import 'package:musicus_common/musicus_common.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class SettingsStorage extends MusicusSettingsStorage {
+  SharedPreferences _pref;
+
+  Future<void> load() async {
+    _pref = await SharedPreferences.getInstance();
+  }
+
+  @override
+  Future<int> getInt(String key) {
+    return Future.value(_pref.getInt(key));
+  }
+
+  @override
+  Future<String> getString(String key) {
+    return Future.value(_pref.getString(key));
+  }
+
+  @override
+  Future<void> setInt(String key, int value) async {
+    await _pref.setInt(key, value);
+  }
+
+  @override
+  Future<void> setString(String key, String value) async {
+    await _pref.setString(key, value);
+  }
+}

desktop/linux/.gitignore

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+flutter/ephemeral

desktop/linux/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+project(runner LANGUAGES CXX)
+
+set(BINARY_NAME "musicus_desktop")
+
+cmake_policy(SET CMP0063 NEW)
+
+set(CMAKE_INSTALL_RPATH "$ORIGIN/lib")
+
+# Configure build options.
+if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+  set(CMAKE_BUILD_TYPE "Debug" CACHE
+    STRING "Flutter build mode" FORCE)
+  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
+    "Debug" "Profile" "Release")
+endif()
+
+# Compilation settings that should be applied to most targets.
+function(APPLY_STANDARD_SETTINGS TARGET)
+  target_compile_features(${TARGET} PUBLIC cxx_std_14)
+  target_compile_options(${TARGET} PRIVATE -Wall -Werror)
+  target_compile_options(${TARGET} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:-O3>")
+  target_compile_definitions(${TARGET} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:NDEBUG>")
+endfunction()
+
+set(FLUTTER_MANAGED_DIR "${CMAKE_CURRENT_SOURCE_DIR}/flutter")
+
+# Flutter library and tool build rules.
+add_subdirectory(${FLUTTER_MANAGED_DIR})
+
+# System-level dependencies.
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
+
+# Application build
+add_executable(${BINARY_NAME}
+  "main.cc"
+  "my_application.cc"
+  "${FLUTTER_MANAGED_DIR}/generated_plugin_registrant.cc"
+)
+apply_standard_settings(${BINARY_NAME})
+target_link_libraries(${BINARY_NAME} PRIVATE flutter)
+target_link_libraries(${BINARY_NAME} PRIVATE PkgConfig::GTK)
+add_dependencies(${BINARY_NAME} flutter_assemble)
+
+# Generated plugin build rules, which manage building the plugins and adding
+# them to the application.
+include(flutter/generated_plugins.cmake)
+
+
+# === Installation ===
+# By default, "installing" just makes a relocatable bundle in the build
+# directory.
+set(BUILD_BUNDLE_DIR "${PROJECT_BINARY_DIR}/bundle")
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+  set(CMAKE_INSTALL_PREFIX "${BUILD_BUNDLE_DIR}" CACHE PATH "..." FORCE)
+endif()
+
+# Start with a clean build bundle directory every time.
+install(CODE "
+  file(REMOVE_RECURSE \"${BUILD_BUNDLE_DIR}/\")
+  " COMPONENT Runtime)
+
+set(INSTALL_BUNDLE_DATA_DIR "${CMAKE_INSTALL_PREFIX}/data")
+set(INSTALL_BUNDLE_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib")
+
+install(TARGETS ${BINARY_NAME} RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_ICU_DATA_FILE}" DESTINATION "${INSTALL_BUNDLE_DATA_DIR}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+  COMPONENT Runtime)
+
+if(PLUGIN_BUNDLED_LIBRARIES)
+  install(FILES "${PLUGIN_BUNDLED_LIBRARIES}"
+    DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endif()
+
+# Fully re-copy the assets directory on each build to avoid having stale files
+# from a previous install.
+set(FLUTTER_ASSET_DIR_NAME "flutter_assets")
+install(CODE "
+  file(REMOVE_RECURSE \"${INSTALL_BUNDLE_DATA_DIR}/${FLUTTER_ASSET_DIR_NAME}\")
+  " COMPONENT Runtime)
+install(DIRECTORY "${PROJECT_BUILD_DIR}/${FLUTTER_ASSET_DIR_NAME}"
+  DESTINATION "${INSTALL_BUNDLE_DATA_DIR}" COMPONENT Runtime)
+
+# Install the AOT library on non-Debug builds only.
+if(NOT CMAKE_BUILD_TYPE MATCHES "Debug")
+  install(FILES "${AOT_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endif()

desktop/linux/flutter/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+
+set(EPHEMERAL_DIR "${CMAKE_CURRENT_SOURCE_DIR}/ephemeral")
+
+# Configuration provided via flutter tool.
+include(${EPHEMERAL_DIR}/generated_config.cmake)
+
+# TODO: Move the rest of this into files in ephemeral. See
+# https://github.com/flutter/flutter/issues/57146.
+
+# Serves the same purpose as list(TRANSFORM ... PREPEND ...),
+# which isn't available in 3.10.
+function(list_prepend LIST_NAME PREFIX)
+    set(NEW_LIST "")
+    foreach(element ${${LIST_NAME}})
+        list(APPEND NEW_LIST "${PREFIX}${element}")
+    endforeach(element)
+    set(${LIST_NAME} "${NEW_LIST}" PARENT_SCOPE)
+endfunction()
+
+# === Flutter Library ===
+# System-level dependencies.
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
+pkg_check_modules(GLIB REQUIRED IMPORTED_TARGET glib-2.0)
+pkg_check_modules(GIO REQUIRED IMPORTED_TARGET gio-2.0)
+
+set(FLUTTER_LIBRARY "${EPHEMERAL_DIR}/libflutter_linux_gtk.so")
+
+# Published to parent scope for install step.
+set(FLUTTER_LIBRARY ${FLUTTER_LIBRARY} PARENT_SCOPE)
+set(FLUTTER_ICU_DATA_FILE "${EPHEMERAL_DIR}/icudtl.dat" PARENT_SCOPE)
+set(PROJECT_BUILD_DIR "${PROJECT_DIR}/build/" PARENT_SCOPE)
+set(AOT_LIBRARY "${PROJECT_DIR}/build/lib/libapp.so" PARENT_SCOPE)
+
+list(APPEND FLUTTER_LIBRARY_HEADERS
+  "fl_basic_message_channel.h"
+  "fl_binary_codec.h"
+  "fl_binary_messenger.h"
+  "fl_dart_project.h"
+  "fl_engine.h"
+  "fl_json_message_codec.h"
+  "fl_json_method_codec.h"
+  "fl_message_codec.h"
+  "fl_method_call.h"
+  "fl_method_channel.h"
+  "fl_method_codec.h"
+  "fl_method_response.h"
+  "fl_plugin_registrar.h"
+  "fl_plugin_registry.h"
+  "fl_standard_message_codec.h"
+  "fl_standard_method_codec.h"
+  "fl_string_codec.h"
+  "fl_value.h"
+  "fl_view.h"
+  "flutter_linux.h"
+)
+list_prepend(FLUTTER_LIBRARY_HEADERS "${EPHEMERAL_DIR}/flutter_linux/")
+add_library(flutter INTERFACE)
+target_include_directories(flutter INTERFACE
+  "${EPHEMERAL_DIR}"
+)
+target_link_libraries(flutter INTERFACE "${FLUTTER_LIBRARY}")
+target_link_libraries(flutter INTERFACE
+  PkgConfig::GTK
+  PkgConfig::GLIB
+  PkgConfig::GIO
+)
+add_dependencies(flutter flutter_assemble)
+
+# === Flutter tool backend ===
+# _phony_ is a non-existent file to force this command to run every time,
+# since currently there's no way to get a full input/output list from the
+# flutter tool.
+add_custom_command(
+  OUTPUT ${FLUTTER_LIBRARY} ${FLUTTER_LIBRARY_HEADERS}
+    ${CMAKE_CURRENT_BINARY_DIR}/_phony_
+  COMMAND ${CMAKE_COMMAND} -E env
+    ${FLUTTER_TOOL_ENVIRONMENT}
+    "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.sh"
+      linux-x64 ${CMAKE_BUILD_TYPE}
+)
+add_custom_target(flutter_assemble DEPENDS
+  "${FLUTTER_LIBRARY}"
+  ${FLUTTER_LIBRARY_HEADERS}
+)

desktop/linux/flutter/generated_plugin_registrant.cc

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+//
+//  Generated file. Do not edit.
+//
+
+#include "generated_plugin_registrant.h"
+
+#include <file_chooser/file_chooser_plugin.h>
+#include <url_launcher_linux/url_launcher_plugin.h>
+
+void fl_register_plugins(FlPluginRegistry* registry) {
+  g_autoptr(FlPluginRegistrar) file_chooser_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "FileChooserPlugin");
+  file_chooser_plugin_register_with_registrar(file_chooser_registrar);
+  g_autoptr(FlPluginRegistrar) url_launcher_linux_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "UrlLauncherPlugin");
+  url_launcher_plugin_register_with_registrar(url_launcher_linux_registrar);
+}

desktop/linux/flutter/generated_plugin_registrant.h

@@ -0,0 +1,13 @@
+//
+//  Generated file. Do not edit.
+//
+
+#ifndef GENERATED_PLUGIN_REGISTRANT_
+#define GENERATED_PLUGIN_REGISTRANT_
+
+#include <flutter_linux/flutter_linux.h>
+
+// Registers Flutter plugins.
+void fl_register_plugins(FlPluginRegistry* registry);
+
+#endif  // GENERATED_PLUGIN_REGISTRANT_

desktop/linux/flutter/generated_plugins.cmake

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+#
+# Generated file, do not edit.
+#
+
+list(APPEND FLUTTER_PLUGIN_LIST
+  file_chooser
+  url_launcher_linux
+)
+
+set(PLUGIN_BUNDLED_LIBRARIES)
+
+foreach(plugin ${FLUTTER_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${plugin}/linux plugins/${plugin})
+  target_link_libraries(${BINARY_NAME} PRIVATE ${plugin}_plugin)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES $<TARGET_FILE:${plugin}_plugin>)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${plugin}_bundled_libraries})
+endforeach(plugin)

desktop/linux/main.cc

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+#include "my_application.h"
+
+int main(int argc, char** argv) {
+  // Only X11 is currently supported.
+  // Wayland support is being developed: https://github.com/flutter/flutter/issues/57932.
+  gdk_set_allowed_backends("x11");
+
+  g_autoptr(MyApplication) app = my_application_new();
+  return g_application_run(G_APPLICATION(app), argc, argv);
+}

desktop/linux/my_application.cc

@@ -0,0 +1,40 @@
+#include "my_application.h"
+
+#include <flutter_linux/flutter_linux.h>
+
+#include "flutter/generated_plugin_registrant.h"
+
+struct _MyApplication {
+  GtkApplication parent_instance;
+};
+
+G_DEFINE_TYPE(MyApplication, my_application, GTK_TYPE_APPLICATION)
+
+// Implements GApplication::activate.
+static void my_application_activate(GApplication* application) {
+  GtkWindow* window =
+      GTK_WINDOW(gtk_application_window_new(GTK_APPLICATION(application)));
+  gtk_window_set_title(window, "Musicus");
+  gtk_window_set_default_size(window, 640, 453);
+  gtk_widget_show(GTK_WIDGET(window));
+
+  g_autoptr(FlDartProject) project = fl_dart_project_new();
+
+  FlView* view = fl_view_new(project);
+  gtk_widget_show(GTK_WIDGET(view));
+  gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(view));
+
+  fl_register_plugins(FL_PLUGIN_REGISTRY(view));
+
+  gtk_widget_grab_focus(GTK_WIDGET(view));
+}
+
+static void my_application_class_init(MyApplicationClass* klass) {
+  G_APPLICATION_CLASS(klass)->activate = my_application_activate;
+}
+
+static void my_application_init(MyApplication* self) {}
+
+MyApplication* my_application_new() {
+  return MY_APPLICATION(g_object_new(my_application_get_type(), nullptr));
+}

desktop/linux/my_application.h

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+#ifndef FLUTTER_MY_APPLICATION_H_
+#define FLUTTER_MY_APPLICATION_H_
+
+#include <gtk/gtk.h>
+
+G_DECLARE_FINAL_TYPE(MyApplication, my_application, MY, APPLICATION,
+                     GtkApplication)
+
+/**
+ * my_application_new:
+ *
+ * Creates a new Flutter-based application.
+ *
+ * Returns: a new #MyApplication.
+ */
+MyApplication* my_application_new();
+
+#endif  // FLUTTER_MY_APPLICATION_H_

desktop/pubspec.yaml

@@ -0,0 +1,23 @@
+name: musicus_desktop
+version: 0.1.0
+description: Desktop version of the classical music player and organizer.
+
+environment:
+  sdk: ">=2.3.0 <3.0.0"
+
+dependencies:
+  file_chooser:
+    git:
+      url: git://github.com/google/flutter-desktop-embedding.git
+      path: plugins/file_chooser
+      ref: bd722fbdb6d491d4b7781c240543ed3b3b181063
+  flutter:
+    sdk: flutter
+  musicus_common:
+    path: ../common
+  path:
+  path_provider:
+  shared_preferences:
+
+flutter:
+  uses-material-design: true