Move GtkWindow logic to separate file

clapper_src/window.js

@@ -0,0 +1,48 @@
+const { Gdk, GObject, Gtk } = imports.gi;
+
+var Window = GObject.registerClass({
+    Signals: {
+        'fullscreen-changed': {
+            param_types: [GObject.TYPE_BOOLEAN]
+        },
+    }
+}, class ClapperWindow extends Gtk.ApplicationWindow
+{
+    _init(application, title)
+    {
+        super._init({
+            application: application,
+            title: title || 'Clapper',
+            border_width: 0,
+            resizable: true,
+            window_position: Gtk.WindowPosition.CENTER,
+            width_request: 960,
+            height_request: 642
+        });
+        this.isFullscreen = false;
+
+        this.connect(
+            'window-state-event', this._onWindowStateEvent.bind(this)
+        );
+    }
+
+    toggleFullscreen()
+    {
+        let un = (this.isFullscreen) ? 'un' : '';
+        this[`${un}fullscreen`]();
+    }
+
+    _onWindowStateEvent(self, event)
+    {
+        let window = event.get_window();
+        let state = window.get_state();
+
+        let isFullscreen = Boolean(state & Gdk.WindowState.FULLSCREEN);
+
+        if(this.isFullscreen === isFullscreen)
+            return;
+
+        this.isFullscreen = isFullscreen;
+        this.emit('fullscreen-changed', this.isFullscreen);
+    }
+});