FlClash/linux/runner/my_application.cc

#include "my_application.h"

#include <flutter_linux/flutter_linux.h>
#ifdef GDK_WINDOWING_X11
#include <gdk/gdkx.h>
#endif

#include <window/window_plugin.h>

#include "flutter/generated_plugin_registrant.h"

struct _MyApplication {
  GtkApplication parent_instance;
  char** dart_entrypoint_arguments;
  gboolean had_window_before_emit;
};

G_DEFINE_TYPE(MyApplication, my_application, GTK_TYPE_APPLICATION)

// Implements GApplication::activate.
static void my_application_activate(GApplication* application) {
  MyApplication* self = MY_APPLICATION(application);
  if (self->had_window_before_emit) {
    return;
  }
  GtkWindow* window =
      GTK_WINDOW(gtk_application_window_new(GTK_APPLICATION(application)));

  // Use a header bar when running in GNOME as this is the common style used
  // by applications and is the setup most users will be using (e.g. Ubuntu
  // desktop).
  // If running on X and not using GNOME then just use a traditional title bar
  // in case the window manager does more exotic layout, e.g. tiling.
  // If running on Wayland assume the header bar will work (may need changing
  // if future cases occur).
  gboolean use_header_bar = TRUE;
#ifdef GDK_WINDOWING_X11
  GdkScreen* screen = gtk_window_get_screen(window);
  if (GDK_IS_X11_SCREEN(screen)) {
    const gchar* wm_name = gdk_x11_screen_get_window_manager_name(screen);
    if (g_strcmp0(wm_name, "GNOME Shell") != 0) {
      use_header_bar = FALSE;
    }
  }
#endif
  if (use_header_bar) {
    GtkHeaderBar* header_bar = GTK_HEADER_BAR(gtk_header_bar_new());
    gtk_widget_show(GTK_WIDGET(header_bar));
    gtk_header_bar_set_title(header_bar, "FlClash");
    gtk_header_bar_set_show_close_button(header_bar, TRUE);
    gtk_window_set_titlebar(window, GTK_WIDGET(header_bar));
  } else {
    gtk_window_set_title(window, "FlClash");
  }

  gtk_window_set_default_size(window, 680, 580);

  // X11 panels that do not match the window to a desktop entry read its icon;
  // GDK leaves one over 512x512 out of _NET_WM_ICON without a word.
  g_autofree gchar* executable = g_file_read_link("/proc/self/exe", nullptr);
  if (executable != nullptr) {
    g_autofree gchar* directory = g_path_get_dirname(executable);
    g_autofree gchar* path = g_build_filename(
        directory, "data", "flutter_assets", "assets", "images", "icon.png",
        nullptr);
    g_autoptr(GdkPixbuf) icon =
        gdk_pixbuf_new_from_file_at_size(path, 256, 256, nullptr);
    if (icon != nullptr) {
      gtk_window_set_icon(window, icon);
    }
  }

  g_autoptr(FlDartProject) project = fl_dart_project_new();
  fl_dart_project_set_dart_entrypoint_arguments(project, self->dart_entrypoint_arguments);

  FlView* view = fl_view_new(project);
  GdkRGBA background_color;
  // Background defaults to black, override it here if necessary, e.g. #00000000 for transparent.
  gdk_rgba_parse(&background_color, "#000000");
  fl_view_set_background_color(view, &background_color);
  gtk_widget_show(GTK_WIDGET(view));
  gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(view));

  // Realize the view so Flutter can render even if the window stays hidden
  // until Dart startup logic explicitly shows it.
  gtk_widget_realize(GTK_WIDGET(view));

  fl_register_plugins(FL_PLUGIN_REGISTRY(view));

  gtk_widget_grab_focus(GTK_WIDGET(view));
}

// Implements GApplication::command_line.
static gint my_application_command_line(GApplication* application, GApplicationCommandLine* command_line) {
  MyApplication* self = MY_APPLICATION(application);
  if (self->dart_entrypoint_arguments == nullptr) {
    gchar** arguments = g_application_command_line_get_arguments(command_line, nullptr);
    // Strip out the first argument as it is the binary name.
    self->dart_entrypoint_arguments = g_strdupv(arguments + 1);
    g_strfreev(arguments);
  }
  g_application_activate(application);
  return 0;
}

// Implements GApplication::before_emit.
static void my_application_before_emit(GApplication* application, GVariant* platform_data) {
  MyApplication* self = MY_APPLICATION(application);
  self->had_window_before_emit =
      gtk_application_get_windows(GTK_APPLICATION(application)) != nullptr;
  G_APPLICATION_CLASS(my_application_parent_class)->before_emit(application, platform_data);
}

// Implements GApplication::after_emit. A relaunch reaches the primary as a
// command-line signal whose activate returns early on the existing window, so
// the window is raised here, while the launcher's activation token is still
// current.
static void my_application_after_emit(GApplication* application, GVariant* platform_data) {
  MyApplication* self = MY_APPLICATION(application);
  if (self->had_window_before_emit) {
    window_plugin_activate();
  }
  G_APPLICATION_CLASS(my_application_parent_class)->after_emit(application, platform_data);
}

// Implements GApplication::startup.
static void my_application_startup(GApplication* application) {
  //MyApplication* self = MY_APPLICATION(object);

  // Perform any actions required at application startup.

  G_APPLICATION_CLASS(my_application_parent_class)->startup(application);
}

// Implements GApplication::shutdown.
static void my_application_shutdown(GApplication* application) {
  //MyApplication* self = MY_APPLICATION(object);

  // Perform any actions required at application shutdown.

  G_APPLICATION_CLASS(my_application_parent_class)->shutdown(application);
}

// Implements GObject::dispose.
static void my_application_dispose(GObject* object) {
  MyApplication* self = MY_APPLICATION(object);
  g_clear_pointer(&self->dart_entrypoint_arguments, g_strfreev);
  G_OBJECT_CLASS(my_application_parent_class)->dispose(object);
}

static void my_application_class_init(MyApplicationClass* klass) {
  G_APPLICATION_CLASS(klass)->activate = my_application_activate;
  G_APPLICATION_CLASS(klass)->command_line = my_application_command_line;
  G_APPLICATION_CLASS(klass)->before_emit = my_application_before_emit;
  G_APPLICATION_CLASS(klass)->after_emit = my_application_after_emit;
  G_APPLICATION_CLASS(klass)->startup = my_application_startup;
  G_APPLICATION_CLASS(klass)->shutdown = my_application_shutdown;
  G_OBJECT_CLASS(klass)->dispose = my_application_dispose;
}

static void my_application_init(MyApplication* self) {}

MyApplication* my_application_new() {
  // Set the program name to the application ID, which helps various systems
  // like GTK and desktop environments map this running application to its
  // corresponding .desktop file. This ensures better integration by allowing
  // the application to be recognized beyond its binary name.
  g_set_prgname(APPLICATION_ID);

  return MY_APPLICATION(g_object_new(my_application_get_type(),
                                     "application-id", APPLICATION_ID,
                                     "flags", G_APPLICATION_HANDLES_COMMAND_LINE,
                                     nullptr));
}