Fixed nasty hover bug after first notification

src/notiDaemon/notiDaemon.vala

@@ -7,7 +7,6 @@ namespace SwayNotificationCenter {
             new HashTable<string, uint32> (str_hash, str_equal);
 
         public ControlCenter control_center;
-        public NotificationWindow noti_window;
 
         public NotiDaemon (SwayncDaemon swaync_daemon) {
             this.notify["dnd"].connect (() => on_dnd_toggle (dnd));
@@ -15,7 +14,6 @@ namespace SwayNotificationCenter {
             // Init dnd from gsettings
             self_settings.bind ("dnd-state", this, "dnd", SettingsBindFlags.DEFAULT);
 
-            this.noti_window = new NotificationWindow ();
             this.control_center = new ControlCenter (swaync_daemon, this);
         }
 
@@ -25,7 +23,7 @@ namespace SwayNotificationCenter {
          */
         public void set_noti_window_visibility (bool value)
         throws DBusError, IOError {
-            noti_window.change_visibility (value);
+            NotificationWindow.instance.change_visibility (value);
         }
 
         /** Toggles the current Do Not Disturb state */
@@ -53,7 +51,7 @@ namespace SwayNotificationCenter {
         /** Method to close notification and send DISMISSED signal */
         public void manually_close_notification (uint32 id, bool timeout)
         throws DBusError, IOError {
-            noti_window.close_notification (id);
+            NotificationWindow.instance.close_notification (id);
             if (!timeout) {
                 control_center.close_notification (id);
                 NotificationClosed (id, ClosedReasons.DISMISSED);
@@ -66,14 +64,14 @@ namespace SwayNotificationCenter {
 
         /** Closes all popup and controlcenter notifications */
         public void close_all_notifications () throws DBusError, IOError {
-            noti_window.close_all_notifications ();
+            NotificationWindow.instance.close_all_notifications ();
             control_center.close_all_notifications ();
         }
 
         /** Closes latest popup notification */
         public void hide_latest_notification (bool close)
         throws DBusError, IOError {
-            uint32 ? id = noti_window.get_latest_notification ();
+            uint32 ? id = NotificationWindow.instance.get_latest_notification ();
             if (id == null) return;
             manually_close_notification (id, !close);
         }
@@ -157,7 +155,7 @@ namespace SwayNotificationCenter {
             // Replace notification logic
             if (id == replaces_id) {
                 param.replaces = true;
-                noti_window.close_notification (id);
+                NotificationWindow.instance.close_notification (id);
                 control_center.close_notification (id, true);
             } else if (param.synchronous != null
                        && param.synchronous.length > 0) {
@@ -168,7 +166,7 @@ namespace SwayNotificationCenter {
                         param.synchronous, null, out r_id)) {
                     param.replaces = true;
                     // Close the notification
-                    noti_window.close_notification (r_id);
+                    NotificationWindow.instance.close_notification (r_id);
                     control_center.close_notification (r_id, true);
                 }
                 synchronous_ids.set (param.synchronous, id);
@@ -179,7 +177,7 @@ namespace SwayNotificationCenter {
                 && !control_center.get_visibility ()) {
                 if (param.urgency == UrgencyLevels.CRITICAL ||
                     (!dnd && param.urgency != UrgencyLevels.CRITICAL)) {
-                    noti_window.add_notification (param, this);
+                    NotificationWindow.instance.add_notification (param, this);
                 }
             }
             // Only add notification to CC if it isn't IGNORED and not transient
@@ -255,7 +253,7 @@ namespace SwayNotificationCenter {
          */
         [DBus (name = "CloseNotification")]
         public void close_notification (uint32 id) throws DBusError, IOError {
-            noti_window.close_notification (id);
+            NotificationWindow.instance.close_notification (id);
             control_center.close_notification (id);
             NotificationClosed (id, ClosedReasons.CLOSED_BY_CLOSENOTIFICATION);
         }

src/notificationWindow/notificationWindow.ui

@@ -2,7 +2,7 @@
 <!-- Generated with glade 3.38.2 -->
 <interface>
   <requires lib="gtk+" version="3.24"/>
-  <template class="SwayNotificationCenterNotificationWindow" parent="GtkApplicationWindow">
+  <template class="SwayNotificationCenterNotiWindow" parent="GtkApplicationWindow">
     <property name="can-focus">False</property>
     <property name="role">NotificationWindow</property>
     <property name="resizable">False</property>

src/notificationWindow/notificationWindow.vala

 namespace SwayNotificationCenter {
+    public class NotificationWindow : Object {
+        private static NotiWindow ? window = null;
+        // Use a NotiWindow singleton due to a nasty notification
+        // enter_notify_event bug where GTK still thinks that the cursor is at
+        // that location after closing the last notification. The next notification
+        // would sometimes automatically be hovered...
+        public static NotiWindow instance {
+            get {
+                if (window == null) {
+                    window = new NotiWindow ();
+                } else if (!window.get_mapped () ||
+                           !window.get_realized () ||
+                           !(window.get_child () is Gtk.Widget)) {
+                    window.destroy ();
+                    window = new NotiWindow ();
+                }
+                return window;
+            }
+        }
+    }
+
     [GtkTemplate (ui = "/org/erikreider/sway-notification-center/notificationWindow/notificationWindow.ui")]
-    public class NotificationWindow : Gtk.ApplicationWindow {
+    public class NotiWindow : Gtk.ApplicationWindow {
 
         [GtkChild]
         unowned Gtk.ScrolledWindow scrolled_window;
@@ -15,7 +36,7 @@ namespace SwayNotificationCenter {
 
         private const int MAX_HEIGHT = 600;
 
-        public NotificationWindow () {
+        public NotiWindow () {
             if (!GtkLayerShell.is_supported ()) {
                 stderr.printf ("GTKLAYERSHELL IS NOT SUPPORTED!\n");
                 stderr.printf ("Swaync only works on Wayland!\n");
@@ -113,8 +134,13 @@ namespace SwayNotificationCenter {
                 noti.destroy ();
             }
 
-            if (!this.get_realized ()) return;
-            if (box.get_children ().length () == 0) this.hide ();
+            if (!get_realized ()
+                || !get_mapped ()
+                || !(get_child () is Gtk.Widget)
+                || box.get_children ().length () == 0) {
+                close ();
+                return;
+            }
         }
 
         public void add_notification (NotifyParams param,