[gnome-shell] messageTray: use a "hot corner" to summon the tray

[Rui Matos <rtcm src gnome org>]

commit 0cbaeaefedef84d57b1c24be37927ac6c4837edf
Author: Rui Matos <tiagomatos gmail com>
Date:   Fri Nov 4 00:26:49 2011 +0000

    messageTray: use a "hot corner" to summon the tray
    
    Instead of leaving the tray covering the whole last pixel row when it's
    hidden, hide it completely. This avoids mouse events not being delivered to
    application windows on the last pixel row.
    
    To summon the tray we use a single reactive pixel on the corner.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=663366

 js/ui/messageTray.js |   24 ++++++++++++++++++++++--
 1 files changed, 22 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/messageTray.js b/js/ui/messageTray.js
index 79dbe3d..057b049 100644
--- a/js/ui/messageTray.js
+++ b/js/ui/messageTray.js
@@ -1430,8 +1430,16 @@ const MessageTray = new Lang.Class({
         this._notificationRemoved = false;
         this._reNotifyAfterHideNotification = null;
 
+        this._corner = new Clutter.Rectangle({ width: 1,
+                                               height: 1,
+                                               opacity: 0,
+                                               reactive: true });
+        this._corner.connect('enter-event', Lang.bind(this, this._onCornerEnter));
+        Main.layoutManager.trayBox.add_actor(this._corner);
+        Main.layoutManager.trackChrome(this._corner);
+
         Main.layoutManager.trayBox.add_actor(this.actor);
-        this.actor.y = -1;
+        this.actor.y = this.actor.height;
         Main.layoutManager.trackChrome(this.actor);
         Main.layoutManager.trackChrome(this._notificationBin);
 
@@ -1470,12 +1478,24 @@ const MessageTray = new Lang.Class({
         this._chatSummaryItemsCount = 0;
     },
 
+    _onCornerEnter: function(actor, event) {
+        this._pointerInSummary = true;
+        this._updateState();
+    },
+
     _setSizePosition: function() {
         let monitor = Main.layoutManager.bottomMonitor;
         this._notificationBin.x = 0;
         this._notificationBin.width = monitor.width;
         this._summaryBin.x = 0;
         this._summaryBin.width = monitor.width;
+
+        if (St.Widget.get_default_direction() == St.TextDirection.RTL)
+            this._corner.x = 0;
+        else
+            this._corner.x = Main.layoutManager.trayBox.width - 1;
+
+        this._corner.y = Main.layoutManager.trayBox.height - 1;
     },
 
     contains: function(source) {
@@ -2076,7 +2096,7 @@ const MessageTray = new Lang.Class({
 
     _hideTray: function() {
         this._tween(this.actor, '_trayState', State.HIDDEN,
-                    { y: -1,
+                    { y: this.actor.height,
                       time: ANIMATION_TIME,
                       transition: 'easeOutQuad'
                     });