🎉 Add WindowPicker

resources/interfaces/org.gnome.shell.extensions.burn-my-windows.xml

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+<!--
+SPDX-FileCopyrightText: Simon Schneegans <code@simonschneegans.de>
+SPDX-License-Identifier: CC0-1.0
+-->
+
+<node>
+    <interface name="org.gnome.shell.extensions.BurnMyWindows">
+        <method name="PickWindow" />
+        <signal name="WindowPicked">
+            <arg name="window" type="s" />
+        </signal>
+    </interface>
+</node>

src/WindowPicker.js

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+//////////////////////////////////////////////////////////////////////////////////////////
+//          )                                                   (                       //
+//       ( /(   (  (               )    (       (  (  (         )\ )    (  (            //
+//       )\()) ))\ )(   (         (     )\ )    )\))( )\  (    (()/( (  )\))(  (        //
+//      ((_)\ /((_|()\  )\ )      )\  '(()/(   ((_)()((_) )\ )  ((_)))\((_)()\ )\       //
+//      | |(_|_))( ((_)_(_/(    _((_))  )(_))  _(()((_|_)_(_/(  _| |((_)(()((_|(_)      //
+//      | '_ \ || | '_| ' \))  | '  \()| || |  \ V  V / | ' \)) _` / _ \ V  V (_-<      //
+//      |_.__/\_,_|_| |_||_|   |_|_|_|  \_, |   \_/\_/|_|_||_|\__,_\___/\_/\_//__/      //
+//                                 |__/                                                 //
+//////////////////////////////////////////////////////////////////////////////////////////
+
+// SPDX-FileCopyrightText: Simon Schneegans <code@simonschneegans.de>
+// SPDX-FileCopyrightText: Aurélien Hamy <aunetx@yandex.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+'use strict';
+
+const {Gio, GLib}  = imports.gi;
+const Main         = imports.ui.main;
+const LookingGlass = imports.ui.lookingGlass;
+
+const Me    = imports.misc.extensionUtils.getCurrentExtension();
+const utils = Me.imports.src.utils;
+
+//////////////////////////////////////////////////////////////////////////////////////////
+// This is based on the window-picking functionality of the Blur-My-Shell extension.    //
+// The PickWindow() method is exposed via the D-Bus and can be called by the            //
+// preferences dialog of the Burn-My-Windows extensions in order to initiate the window //
+// picking.                                                                             //
+//////////////////////////////////////////////////////////////////////////////////////////
+
+var WindowPicker = class WindowPicker {
+  // ------------------------------------------------------------------------- constructor
+
+  constructor() {
+    const iFace = utils.getStringResource(
+      '/interfaces/org.gnome.shell.extensions.burn-my-windows.xml');
+    this._dbus = Gio.DBusExportedObject.wrapJSObject(iFace, this);
+  }
+
+  // --------------------------------------------------------------------- D-Bus interface
+
+  // This method is exposed via the D-Bus. It is called by the preferences dialog of the
+  // Burn-My-Windows extensions in order to initiate the window picking.
+  PickWindow() {
+
+    // We use the actor picking from LookingGlass. This seems a bit hacky and also allows
+    // selecting things of the Shell which are not windows, but it does the trick :)
+    const lookingGlass = Main.createLookingGlass();
+    lookingGlass.open();
+    lookingGlass.hide();
+
+    const inspector = new LookingGlass.Inspector(Main.createLookingGlass());
+    inspector.connect('target', (me, target, x, y) => {
+      // Remove border effect when window is picked.
+      target.get_effects()
+        .filter(e => e.toString().includes('lookingGlass_RedBorderEffect'))
+        .forEach(e => target.remove_effect(e));
+
+      let actor = target;
+      if (target.toString().includes('MetaSurfaceActor')) {
+        actor = target.get_parent();
+      }
+
+      let wmClass = 'window-not-found';
+      if (actor.toString().includes('WindowActor')) {
+        wmClass = actor.meta_window.get_wm_class() ?? 'window-not-found';
+      }
+
+      this._dbus.emit_signal('WindowPicked', new GLib.Variant('(s)', [wmClass]));
+    });
+
+    // Close LookingGlass when we're done.
+    inspector.connect('closed', _ => lookingGlass.close());
+  }
+
+  // -------------------------------------------------------------------- public interface
+
+  // Call this to make the window-picking API available on the D-Bus.
+  export() {
+    this._dbus.export(Gio.DBus.session, '/org/gnome/shell/extensions/BurnMyWindows');
+  }
+
+  // Call this to stop this D-Bus again.
+  unexport() {
+    this._dbus.unexport();
+  }
+};