ShellClients: Add PanelClient

src/ShellClients/PanelClient.vala

@@ -0,0 +1,128 @@
+/*
+ * Copyright 2024 elementary, Inc. (https://elementary.io)
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * Authored by: Leonhard Kargl <leo.kargl@proton.me>
+ */
+
+ public class Gala.PanelClient : GLib.Object {
+    private static GLib.HashTable<Meta.Window, Meta.Strut?> window_struts = new GLib.HashTable<Meta.Window, Meta.Strut?> (null, null);
+
+    public Meta.Display display { get; construct; }
+    public ManagedClient client { get; construct; }
+
+    private GLib.HashTable<Meta.Window, Meta.Side> window_anchors = new GLib.HashTable<Meta.Window, Meta.Side> (null, null);
+
+    public PanelClient (Meta.Display display, string[] args) {
+        Object (
+            display: display,
+            client: new ManagedClient (display, args)
+        );
+    }
+
+    public void set_anchor (Meta.Window window, Meta.Side side) {
+        window_anchors[window] = side;
+
+#if HAS_MUTTER_46
+        client.wayland_client.make_dock (window);
+#endif
+
+        position_window (window, side);
+        window.size_changed.connect (() => position_window (window, side));
+
+        window.unmanaged.connect (() => {
+            window_anchors.remove (window);
+
+            if (window_struts.remove (window)) {
+                update_struts ();
+            }
+        });
+    }
+
+    private void position_window (Meta.Window window, Meta.Side side) {
+        var geom = display.get_monitor_geometry (display.get_primary_monitor ());
+        var window_rect = window.get_frame_rect ();
+
+        switch (side) {
+            case TOP:
+                position_window_top (window);
+                break;
+
+            case BOTTOM:
+                position_window_bottom (window);
+                break;
+
+            default:
+                warning ("Side not supported yet");
+                break;
+        }
+    }
+
+    private void position_window_top (Meta.Window window, Meta.Rectangle monitor_geom, Meta.Rectangle window_rect) {
+        var x = monitor_geom.x + (monitor_geom.width - window_rect.width) / 2;
+
+        move_window_idle (window, x, monitor_geom.y);
+    }
+
+    private void position_window_bottom (Meta.Window window, Meta.Rectangle monitor_geom, Meta.Rectangle window_rect) {
+        var x = monitor_geom.x + (monitor_geom.width - window_rect.width) / 2;
+        var y = monitor_geom.y + monitor_geom.height - window_rect.height;
+
+        move_window_idle (window, x, y);
+    }
+
+    private void move_window_idle (Meta.Window window, int x, int y) {
+        Idle.add (() => {
+            window.move_frame (false, x, y);
+            return Source.REMOVE;
+        });
+    }
+
+    public void make_exclusive (Meta.Window window) {
+        if (!(window in window_anchors)) {
+            warning ("Set an anchor before making a window area exclusive.");
+            return;
+        }
+
+        if (window in window_struts) {
+            warning ("Window is already exclusive.");
+            return;
+        }
+
+        window.size_changed.connect (update_strut);
+        update_strut (window);
+    }
+
+    private void update_strut (Meta.Window window) {
+        var rect = window.get_frame_rect ();
+
+        Meta.Strut strut = {
+            rect,
+            window_anchors[window]
+        };
+
+        window_struts[window] = strut;
+
+        update_struts ();
+    }
+
+    private void update_struts () {
+        var list = new SList<Meta.Strut?> ();
+
+        foreach (var window_strut in window_struts.get_values ()) {
+            list.append (window_strut);
+        }
+
+        foreach (var workspace in display.get_workspace_manager ().get_workspaces ()) {
+            workspace.set_builtin_struts (list);
+        }
+    }
+
+    public void unmake_exclusive (Meta.Window window) {
+        if (window in window_struts) {
+            window.size_changed.disconnect (update_strut);
+            window_struts.remove (window);
+            update_struts ();
+        }
+    }
+}

src/meson.build

@@ -41,6 +41,7 @@ gala_bin_sources = files(
     'HotCorners/HotCornerManager.vala',
     'ShellClients/ManagedClient.vala',
     'ShellClients/NotificationsClient.vala',
+    'ShellClients/PanelClient.vala',
     'ShellClients/ShellClientsManager.vala',
     'Widgets/DwellClickTimer.vala',
     'Widgets/IconGroup.vala',