Handy Window

This package enhances the looks of Flutter applications on Linux by providing modern-looking Handy windows with rounded bottom corners.

Handy window	Flutter window

NOTE: Handy windows are only available on Ubuntu 20.04 (GLib >= 2.58) and later.

Usage

Add the dependency to pubspec.yaml:

dependencies:
  handy_window:

Modify the native code to register plugins before showing the Flutter window.

For Flutter new versions

In linux/runner/my_application.cc, move fl_register_plugins before gtk_widget_show(GTK_WIDGET(view)):

   // 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));
 
+  fl_register_plugins(FL_PLUGIN_REGISTRY(view));
+  gtk_widget_show(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));
 
-  fl_register_plugins(FL_PLUGIN_REGISTRY(view));
-
   gtk_widget_grab_focus(GTK_WIDGET(view));
 }

For Flutter old versions

In linux/my_application.cc, register plugins before showing the window and view:

diff --git a/linux/my_application.cc b/linux/my_application.cc
index fa74baa..3133755 100644
--- a/linux/my_application.cc
+++ b/linux/my_application.cc
@@ -48,17 +48,17 @@ static void my_application_activate(GApplication* application) {
   }

   gtk_window_set_default_size(window, 1280, 720);
-  gtk_widget_show(GTK_WIDGET(window));

   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);
-  gtk_widget_show(GTK_WIDGET(view));
   gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(view));

   fl_register_plugins(FL_PLUGIN_REGISTRY(view));

+  gtk_widget_show(GTK_WIDGET(window));
+  gtk_widget_show(GTK_WIDGET(view));
   gtk_widget_grab_focus(GTK_WIDGET(view));
 }