Add window spread for an app

src/DBus.vala

@@ -19,10 +19,10 @@ namespace Gala {
     [DBus (name="org.pantheon.gala")]
     public class DBus {
         private static DBus? instance;
-        private static WindowManager wm;
+        private static WindowManagerGala wm;
 
         [DBus (visible = false)]
-        public static void init (WindowManager _wm) {
+        public static void init (WindowManagerGala _wm) {
             wm = _wm;
 
             Bus.own_name (BusType.SESSION, "org.pantheon.gala", BusNameOwnerFlags.NONE,
@@ -65,19 +65,14 @@ namespace Gala {
                 () => {},
                 () => critical ("Could not acquire name") );
 
-            unowned WindowManagerGala? gala_wm = wm as WindowManagerGala;
-            if (gala_wm != null) {
-                var screensaver_manager = gala_wm.screensaver;
-
-                Bus.own_name (BusType.SESSION, "org.gnome.ScreenSaver", BusNameOwnerFlags.REPLACE,
-                    (connection) => {
-                        try {
-                            connection.register_object ("/org/gnome/ScreenSaver", screensaver_manager);
-                        } catch (Error e) { warning (e.message); }
-                    },
-                    () => {},
-                    () => critical ("Could not acquire ScreenSaver bus") );
-            }
+            Bus.own_name (BusType.SESSION, "org.gnome.ScreenSaver", BusNameOwnerFlags.REPLACE,
+                (connection) => {
+                    try {
+                        connection.register_object ("/org/gnome/ScreenSaver", wm.screensaver);
+                    } catch (Error e) { warning (e.message); }
+                },
+                () => {},
+                () => critical ("Could not acquire ScreenSaver bus") );
         }
 
         private DBus () {

src/DesktopIntegration.vala

@@ -16,17 +16,14 @@ public class Gala.DesktopIntegration : GLib.Object {
         GLib.HashTable<unowned string, Variant> properties;
     }
 
-    private unowned WindowManager wm;
+    private unowned WindowManagerGala wm;
     public uint version { get; default = 1; }
     public signal void running_applications_changed ();
     public signal void windows_changed ();
 
-    public DesktopIntegration (WindowManager wm) {
+    public DesktopIntegration (WindowManagerGala wm) {
         this.wm = wm;
-        unowned WindowManagerGala? gala_wm = wm as WindowManagerGala;
-        if (gala_wm != null) {
-            gala_wm.window_tracker.windows_changed.connect (() => windows_changed ());
-        }
+        wm.window_tracker.windows_changed.connect (() => windows_changed ());
     }
 
     public RunningApplication[] get_running_applications () throws GLib.DBusError, GLib.IOError {
@@ -102,4 +99,21 @@ public class Gala.DesktopIntegration : GLib.Object {
 
         return (owned) returned_windows;
     }
+
+    public void show_windows_for (string app_id) throws IOError, DBusError {
+        App app;
+        if ((app = AppSystem.get_default ().lookup_app (app_id)) == null) {
+            throw new IOError.NOT_FOUND ("App not found");
+        }
+
+        uint64[] window_ids = {};
+        foreach (var window in app.get_windows ()) {
+            window_ids += window.get_id ();
+        }
+
+        var hash_table = new HashTable<string, Variant> (str_hash, str_equal);
+        hash_table["windows"] = window_ids;
+
+        wm.show_window_spread (hash_table);
+    }
 }

src/Widgets/WindowOverview.vala

@@ -75,6 +75,11 @@ public class Gala.WindowOverview : Clutter.Actor, ActivatableComponent {
             workspaces.append (workspace);
         }
 
+        uint64[]? window_ids = null;
+        if (hints != null && "windows" in hints) {
+            window_ids = (uint64[]) hints["windows"];
+        }
+
         var windows = new List<Meta.Window> ();
         foreach (var workspace in workspaces) {
             foreach (unowned var window in workspace.list_windows ()) {
@@ -85,7 +90,9 @@ public class Gala.WindowOverview : Clutter.Actor, ActivatableComponent {
 
                 if (window.window_type != Meta.WindowType.NORMAL &&
                     window.window_type != Meta.WindowType.DIALOG ||
-                    window.is_attached_dialog ()) {
+                    window.is_attached_dialog () ||
+                    (window_ids != null && !(window.get_id () in window_ids))
+                ) {
                     unowned var actor = (Meta.WindowActor) window.get_compositor_private ();
                     actor.hide ();
 

src/WindowManager.vala

@@ -2427,6 +2427,14 @@ namespace Gala {
             new_parent.add_child (actor);
             actor.unref ();
         }
+
+        public void show_window_spread (HashTable<string,Variant>? hints = null) {
+            if (window_overview.is_opened ()) {
+                window_overview.close ();
+            }
+
+            window_overview.open (hints);
+        }
     }
 
     [CCode (cname="clutter_x11_get_stage_window")]