[gnome-shell/wip/abono/maximize: 1/4] windowManager: Generalize translation values

[Alessandro Bono <abono src gnome org>]

commit af0d48a5270cd4edcbbb862f8f3faed1b559b8a4
Author: Alessandro Bono <abono gnome org>
Date:   Sat May 20 16:34:35 2017 +0200

    windowManager: Generalize translation values
    
    Currently, the translation values are setted with the assumption
    that one of the actors (actor or actorClone) represents a
    fullscreen window. To generalize it, we translate 'actor'
    in each dimension about the difference between targetRect and
    sourceRect (e.g., targetRect.x - sourceRect.x). If the difference
    is positive, it means that sourceRect is on the left of targetRect
    (or above targetRect, if we are looking at y values), therefore,
    we need a negative value to translate 'actor' to the left (or up).
    The same logic applies if the difference is negative.
    
    The (un)fullscreen case is not modified:
    since the monitor rect actually matches the target rect (for
    fullscreen) or the source rect (for unfullscreen), we can actually
    substitute those, and get (sourceRect - targetRect) in one case,
    and -(targetRect - sourceRect) in the other.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=766685

 js/ui/windowManager.js |   14 +++-----------
 1 files changed, 3 insertions(+), 11 deletions(-)
---
diff --git a/js/ui/windowManager.js b/js/ui/windowManager.js
index b987467..944ab67 100644
--- a/js/ui/windowManager.js
+++ b/js/ui/windowManager.js
@@ -1331,13 +1331,11 @@ const WindowManager = new Lang.Class({
         actorClone.set_size(oldFrameRect.width, oldFrameRect.height);
         Main.uiGroup.add_actor(actorClone);
 
-        let rect = change == Meta.SizeChange.FULLSCREEN ? oldFrameRect : null;
-
         if (this._clearFullscreenInfo(actor))
             this._shellwm.completed_size_change(actor);
 
         actor.__fullscreenInfo = { clone: actorClone,
-                                   oldRect: rect };
+                                   oldRect: oldFrameRect };
     },
 
     _sizeChangedWindow: function(shellwm, actor) {
@@ -1365,15 +1363,9 @@ const WindowManager = new Lang.Class({
                            transition: 'easeOutQuad'
                          });
 
-        let monitor = Main.layoutManager.monitors[actor.meta_window.get_monitor()];
         let sourceRect = actor.__fullscreenInfo.oldRect;
-        if (sourceRect) {
-            actor.translation_x = sourceRect.x - monitor.x;
-            actor.translation_y = sourceRect.y - monitor.y;
-        } else {
-            actor.translation_x = -(targetRect.x - monitor.x);
-            actor.translation_y = -(targetRect.y - monitor.y);
-        }
+        actor.translation_x = -(targetRect.x - sourceRect.x);
+        actor.translation_y = -(targetRect.y - sourceRect.y);
 
         // Now set scale the actor to size it as the clone.
         actor.scale_x = 1 / scaleX;