Initial support for keeping shellclients in the multitasking view

Author: leolost2605

protocol/pantheon-desktop-shell-v1.xml

@@ -98,6 +98,12 @@
 
       <arg name="hide_mode" type="uint" enum="hide_mode" summary="hide mode"/>
     </request>
+
+    <request name="request_visible_in_multitasking_view">
+      <description summary="request visible in multitasking view">
+        Tell the shell that the panel would like to be visible in the multitasking view.
+      </description>
+    </request>
   </interface>
 
   <interface name="io_elementary_pantheon_widget_v1" version="1">

protocol/pantheon-desktop-shell.vapi

@@ -41,6 +41,7 @@ namespace Pantheon.Desktop {
         public Focus focus;
         public SetSize set_size;
         public SetHideMode set_hide_mode;
+        public RequestVisibleInMultitaskingView request_visible_in_multitasking_view;
     }
 
     [CCode (cheader_filename = "pantheon-desktop-shell-server-protocol.h", cname = "struct io_elementary_pantheon_widget_v1_interface")]
@@ -75,6 +76,8 @@ namespace Pantheon.Desktop {
     [CCode (has_target = false, has_typedef = false)]
     public delegate void SetHideMode (Wl.Client client, Wl.Resource resource, [CCode (type = "uint32_t")] HideMode hide_mode);
     [CCode (has_target = false, has_typedef = false)]
+    public delegate void RequestVisibleInMultitaskingView (Wl.Client client, Wl.Resource resource);
+    [CCode (has_target = false, has_typedef = false)]
     public delegate void SetKeepAbove (Wl.Client client, Wl.Resource resource);
     [CCode (has_target = false, has_typedef = false)]
     public delegate void MakeCentered (Wl.Client client, Wl.Resource resource);

src/PantheonShell.vala

@@ -58,6 +58,7 @@ namespace Gala {
             focus_panel,
             set_size,
             set_hide_mode,
+            request_visible_in_multitasking_view,
         };
 
         wayland_pantheon_widget_interface = {
@@ -311,6 +312,23 @@ namespace Gala {
         ShellClientsManager.get_instance ().set_hide_mode (window, hide_mode);
     }
 
+    internal static void request_visible_in_multitasking_view (Wl.Client client, Wl.Resource resource) {
+        unowned PanelSurface? panel_surface = resource.get_user_data<PanelSurface> ();
+        if (panel_surface.wayland_surface == null) {
+            warning ("Window tried to set visible in mutltiasking view but wayland surface is null.");
+            return;
+        }
+
+        Meta.Window? window;
+        panel_surface.wayland_surface.get ("window", out window, null);
+        if (window == null) {
+            warning ("Window tried to set hide mode but wayland surface had no associated window.");
+            return;
+        }
+
+        ShellClientsManager.get_instance ().request_visible_in_multitasking_view (window);
+    }
+
     internal static void set_keep_above (Wl.Client client, Wl.Resource resource) {
         unowned ExtendedBehaviorSurface? eb_surface = resource.get_user_data<ExtendedBehaviorSurface> ();
         if (eb_surface.wayland_surface == null) {

src/ShellClients/ShellClientsManager.vala

@@ -185,6 +185,15 @@ public class Gala.ShellClientsManager : Object, GestureTarget {
         panel_windows[window].hide_mode = hide_mode;
     }
 
+    public void request_visible_in_multitasking_view (Meta.Window window) {
+        if (!(window in panel_windows)) {
+            warning ("Set anchor for window before visible in mutltiasking view.");
+            return;
+        }
+
+        panel_windows[window].visible_in_multitasking_view = true;
+    }
+
     public void make_centered (Meta.Window window) requires (!is_itself_positioned (window)) {
         positioned_windows[window] = new ShellWindow (window, CENTER);
 

src/ShellClients/ShellWindow.vala

@@ -10,6 +10,8 @@ public class Gala.ShellWindow : PositionedWindow, GestureTarget {
 
     public Clutter.Actor? actor { get { return window_actor; } }
 
+    public bool visible_in_multitasking_view { get; set; default = false; }
+
     private Meta.WindowActor window_actor;
     private double custom_progress = 0;
     private double multitasking_view_progress = 0;
@@ -40,9 +42,16 @@ public class Gala.ShellWindow : PositionedWindow, GestureTarget {
         );
     }
 
+    private double get_hidden_progress () {
+        if (visible_in_multitasking_view) {
+            return double.min (custom_progress, 1 - multitasking_view_progress);
+        } else {
+            return double.max (custom_progress, multitasking_view_progress);
+        }
+    }
+
     private void update_property () {
-        var hidden_progress = double.max (custom_progress, multitasking_view_progress);
-        property_target.propagate (UPDATE, GESTURE_ID, hidden_progress);
+        property_target.propagate (UPDATE, GESTURE_ID, get_hidden_progress ());
     }
 
     public override void propagate (UpdateType update_type, string id, double progress) {
@@ -84,7 +93,7 @@ public class Gala.ShellWindow : PositionedWindow, GestureTarget {
     }
 
     private void update_visibility () {
-        var visible = double.max (multitasking_view_progress, custom_progress) < 0.1;
+        var visible = get_hidden_progress () < 0.1;
         var animating = animations_ongoing > 0;
 
         if (!Meta.Util.is_wayland_compositor ()) {