1  #include "my_application.h"
  2  
  3  #include <flutter_linux/flutter_linux.h>
  4  #ifdef GDK_WINDOWING_X11
  5  #include <gdk/gdkx.h>
  6  #endif
  7  
  8  #include "flutter/generated_plugin_registrant.h"
  9  
 10  struct _MyApplication {
 11    GtkApplication parent_instance;
 12    char** dart_entrypoint_arguments;
 13  };
 14  
 15  G_DEFINE_TYPE(MyApplication, my_application, GTK_TYPE_APPLICATION)
 16  
 17  // Called when first Flutter frame received.
 18  static void first_frame_cb(MyApplication* self, FlView* view) {
 19    gtk_widget_show(gtk_widget_get_toplevel(GTK_WIDGET(view)));
 20  }
 21  
 22  // Implements GApplication::activate.
 23  static void my_application_activate(GApplication* application) {
 24    MyApplication* self = MY_APPLICATION(application);
 25    GtkWindow* window =
 26        GTK_WINDOW(gtk_application_window_new(GTK_APPLICATION(application)));
 27  
 28    // Use a header bar when running in GNOME as this is the common style used
 29    // by applications and is the setup most users will be using (e.g. Ubuntu
 30    // desktop).
 31    // If running on X and not using GNOME then just use a traditional title bar
 32    // in case the window manager does more exotic layout, e.g. tiling.
 33    // If running on Wayland assume the header bar will work (may need changing
 34    // if future cases occur).
 35    gboolean use_header_bar = TRUE;
 36  #ifdef GDK_WINDOWING_X11
 37    GdkScreen* screen = gtk_window_get_screen(window);
 38    if (GDK_IS_X11_SCREEN(screen)) {
 39      const gchar* wm_name = gdk_x11_screen_get_window_manager_name(screen);
 40      if (g_strcmp0(wm_name, "GNOME Shell") != 0) {
 41        use_header_bar = FALSE;
 42      }
 43    }
 44  #endif
 45    if (use_header_bar) {
 46      GtkHeaderBar* header_bar = GTK_HEADER_BAR(gtk_header_bar_new());
 47      gtk_widget_show(GTK_WIDGET(header_bar));
 48      gtk_header_bar_set_title(header_bar, "funit_converter");
 49      gtk_header_bar_set_show_close_button(header_bar, TRUE);
 50      gtk_window_set_titlebar(window, GTK_WIDGET(header_bar));
 51    } else {
 52      gtk_window_set_title(window, "funit_converter");
 53    }
 54  
 55    gtk_window_set_default_size(window, 1280, 720);
 56  
 57    g_autoptr(FlDartProject) project = fl_dart_project_new();
 58    fl_dart_project_set_dart_entrypoint_arguments(
 59        project, self->dart_entrypoint_arguments);
 60  
 61    FlView* view = fl_view_new(project);
 62    GdkRGBA background_color;
 63    // Background defaults to black, override it here if necessary, e.g. #00000000
 64    // for transparent.
 65    gdk_rgba_parse(&background_color, "#000000");
 66    fl_view_set_background_color(view, &background_color);
 67    gtk_widget_show(GTK_WIDGET(view));
 68    gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(view));
 69  
 70    // Show the window when Flutter renders.
 71    // Requires the view to be realized so we can start rendering.
 72    g_signal_connect_swapped(view, "first-frame", G_CALLBACK(first_frame_cb),
 73                             self);
 74    gtk_widget_realize(GTK_WIDGET(view));
 75  
 76    fl_register_plugins(FL_PLUGIN_REGISTRY(view));
 77  
 78    gtk_widget_grab_focus(GTK_WIDGET(view));
 79  }
 80  
 81  // Implements GApplication::local_command_line.
 82  static gboolean my_application_local_command_line(GApplication* application,
 83                                                    gchar*** arguments,
 84                                                    int* exit_status) {
 85    MyApplication* self = MY_APPLICATION(application);
 86    // Strip out the first argument as it is the binary name.
 87    self->dart_entrypoint_arguments = g_strdupv(*arguments + 1);
 88  
 89    g_autoptr(GError) error = nullptr;
 90    if (!g_application_register(application, nullptr, &error)) {
 91      g_warning("Failed to register: %s", error->message);
 92      *exit_status = 1;
 93      return TRUE;
 94    }
 95  
 96    g_application_activate(application);
 97    *exit_status = 0;
 98  
 99    return TRUE;
100  }
101  
102  // Implements GApplication::startup.
103  static void my_application_startup(GApplication* application) {
104    // MyApplication* self = MY_APPLICATION(object);
105  
106    // Perform any actions required at application startup.
107  
108    G_APPLICATION_CLASS(my_application_parent_class)->startup(application);
109  }
110  
111  // Implements GApplication::shutdown.
112  static void my_application_shutdown(GApplication* application) {
113    // MyApplication* self = MY_APPLICATION(object);
114  
115    // Perform any actions required at application shutdown.
116  
117    G_APPLICATION_CLASS(my_application_parent_class)->shutdown(application);
118  }
119  
120  // Implements GObject::dispose.
121  static void my_application_dispose(GObject* object) {
122    MyApplication* self = MY_APPLICATION(object);
123    g_clear_pointer(&self->dart_entrypoint_arguments, g_strfreev);
124    G_OBJECT_CLASS(my_application_parent_class)->dispose(object);
125  }
126  
127  static void my_application_class_init(MyApplicationClass* klass) {
128    G_APPLICATION_CLASS(klass)->activate = my_application_activate;
129    G_APPLICATION_CLASS(klass)->local_command_line =
130        my_application_local_command_line;
131    G_APPLICATION_CLASS(klass)->startup = my_application_startup;
132    G_APPLICATION_CLASS(klass)->shutdown = my_application_shutdown;
133    G_OBJECT_CLASS(klass)->dispose = my_application_dispose;
134  }
135  
136  static void my_application_init(MyApplication* self) {}
137  
138  MyApplication* my_application_new() {
139    // Set the program name to the application ID, which helps various systems
140    // like GTK and desktop environments map this running application to its
141    // corresponding .desktop file. This ensures better integration by allowing
142    // the application to be recognized beyond its binary name.
143    g_set_prgname(APPLICATION_ID);
144  
145    return MY_APPLICATION(g_object_new(my_application_get_type(),
146                                       "application-id", APPLICATION_ID, "flags",
147                                       G_APPLICATION_NON_UNIQUE, nullptr));
148  }