PiliPlus/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 "flutter/generated_plugin_registrant.h"

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

G_DEFINE_TYPE(MyApplication, my_application, GTK_TYPE_APPLICATION)

// Called when first Flutter frame received.
static void first_frame_cb(MyApplication *self, FlView *view) {
  gtk_widget_show(gtk_widget_get_toplevel(GTK_WIDGET(view)));
}

// Called when window is requested to be closed.
static gboolean window_delete_event_cb(GtkWidget *widget, GdkEvent *event,
                                       gpointer data) {
  // Get the application and quit it.
  GtkApplication *app = gtk_window_get_application(GTK_WINDOW(widget));
  if (app != nullptr) {
    g_application_quit(G_APPLICATION(app));
  }
  // Return TRUE to prevent further processing of the delete event.
  return TRUE;
}

// Implements GApplication::activate.
static void my_application_activate(GApplication *application) {
  MyApplication *self = MY_APPLICATION(application);
  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).

  const gboolean use_header_bar = [window]() -> gboolean {
    if (g_file_test(g_build_filename(g_get_user_data_dir(),
                                     "com.example.piliplus", "use_ssd", NULL),
                    G_FILE_TEST_EXISTS))
      return FALSE;

#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) {
        return FALSE;
      }
    }
#endif
    return TRUE;
  }();

  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, "piliplus");
    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, "piliplus");
  }

  gtk_window_set_default_size(window, 1280, 720);

  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));

  // Show the window when Flutter renders.
  // Requires the view to be realized so we can start rendering.
  g_signal_connect_swapped(view, "first-frame", G_CALLBACK(first_frame_cb),
                           self);
  gtk_widget_realize(GTK_WIDGET(view));

  // Connect the delete-event signal to handle window close.
  g_signal_connect(window, "delete-event", G_CALLBACK(window_delete_event_cb),
                   NULL);

  fl_register_plugins(FL_PLUGIN_REGISTRY(view));

  gtk_widget_grab_focus(GTK_WIDGET(view));
}

// Implements GApplication::local_command_line.
static gboolean my_application_local_command_line(GApplication *application,
                                                  gchar ***arguments,
                                                  int *exit_status) {
  MyApplication *self = MY_APPLICATION(application);
  // Strip out the first argument as it is the binary name.
  self->dart_entrypoint_arguments = g_strdupv(*arguments + 1);

  g_autoptr(GError) error = nullptr;
  if (!g_application_register(application, nullptr, &error)) {
    g_warning("Failed to register: %s", error->message);
    *exit_status = 1;
    return TRUE;
  }

  g_application_activate(application);
  *exit_status = 0;

  return TRUE;
}

// 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)->local_command_line =
      my_application_local_command_line;
  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, nullptr));
}