Fade in alt-tab popup, adjust timings

The design calls for item to not appear abruptly, but not too slow
either - 100ms seems to be a good sweet spot for elements which are
supposed to appear "instantly".
Add a fade effect to the alt-tab popup and set the timings for other
fade effects to 100ms.

https://bugzilla.gnome.org/show_bug.cgi?id=621247

js/ui/altTab.js

@@ -15,12 +15,13 @@ const Tweener = imports.ui.tweener;
 
 const POPUP_APPICON_SIZE = 96;
 const POPUP_SCROLL_TIME = 0.10; // seconds
+const POPUP_FADE_TIME = 0.1; // seconds
 
 const DISABLE_HOVER_TIMEOUT = 500; // milliseconds
 
 const THUMBNAIL_DEFAULT_SIZE = 256;
 const THUMBNAIL_POPUP_TIME = 500; // milliseconds
-const THUMBNAIL_FADE_TIME = 0.2; // seconds
+const THUMBNAIL_FADE_TIME = 0.1; // seconds
 
 const iconSizes = [96, 64, 48, 32, 22];
 
@@ -180,6 +181,14 @@ AltTabPopup.prototype = {
             return false;
         }
 
+        this.actor.opacity = 0;
+        this.actor.show();
+        Tweener.addTween(this.actor,
+                         { opacity: 255,
+                           time: POPUP_FADE_TIME,
+                           transition: 'easeOutQuad'
+                         });
+
         return true;
     },
 
@@ -352,7 +361,15 @@ AltTabPopup.prototype = {
     },
 
     destroy : function() {
+        Tweener.addTween(this.actor,
+                         { opacity: 0,
+                           time: POPUP_FADE_TIME,
+                           transition: 'easeOutQuad',
+                           onComplete: Lang.bind(this,
+                               function() {
                                    this.actor.destroy();
+                               })
+                         });
     },
 
     _onDestroy : function() {

js/ui/runDialog.js

@@ -21,7 +21,7 @@ const MAX_FILE_DELETED_BEFORE_INVALID = 10;
 const HISTORY_KEY = 'run_dialog/history';
 const HISTORY_LIMIT = 512;
 
-const DIALOG_FADE_TIME = 0.2;
+const DIALOG_FADE_TIME = 0.1;
 
 function CommandCompleter() {
     this._init();

js/ui/workspace.js

@@ -28,7 +28,8 @@ FRAME_COLOR.from_pixel(0xffffffff);
 
 const SCROLL_SCALE_AMOUNT = 100 / 5;
 
-const LIGHTBOX_FADE_TIME = 0.2;
+const LIGHTBOX_FADE_TIME = 0.1;
+const CLOSE_BUTTON_FADE_TIME = 0.1;
 
 const DRAGGING_WINDOW_OPACITY = 100;
 
@@ -441,7 +442,7 @@ WindowOverlay.prototype = {
         this._parentActor.raise_top();
         Tweener.addTween(this.title,
                         { opacity: 255,
-                          time: Overview.ANIMATION_TIME,
+                          time: CLOSE_BUTTON_FADE_TIME,
                           transition: 'easeOutQuad' });
     },
 

js/ui/workspaceSwitcherPopup.js

@@ -9,7 +9,7 @@ const Main = imports.ui.main;
 
 const Tweener = imports.ui.tweener;
 
-const ANIMATION_TIME = 0.075;
+const ANIMATION_TIME = 0.1;
 const DISPLAY_TIMEOUT = 600;
 
 const LEFT = -1;