Add click actions

taskbar.js

@@ -544,12 +544,10 @@ var taskbar = Utils.defineClass({
             appIcon._draggable.connect('drag-begin',
                                        Lang.bind(this, function() {
                                            appIcon.actor.opacity = 50;
-                                           this._disableWindowPreview();
                                        }));
             appIcon._draggable.connect('drag-end',
                                        Lang.bind(this, function() {
                                            appIcon.actor.opacity = 255;
-                                           this._enableWindowPreview();
                                        }));
         }
 
@@ -607,14 +605,6 @@ var taskbar = Utils.defineClass({
         return item;
     },
 
-    _enableWindowPreview: function() {
-        this.previewMenu.enable();
-    },
-
-    _disableWindowPreview: function() {
-        this.previewMenu.disable();
-    },
-
     // Return an array with the "proper" appIcons currently in the taskbar
     _getAppIcons: function() {
         // Only consider children which are "proper" icons and which are not

windowPreview.js

@@ -258,12 +258,12 @@ var PreviewMenu = Utils.defineClass({
 
             switch (event.get_scroll_direction()) {
                 case Clutter.ScrollDirection.UP:
-                        delta = -increment;
+                    delta = -increment;
                     break;
                 case Clutter.ScrollDirection.SMOOTH:
-                        let [dx, dy] = event.get_scroll_delta();
-                        delta = dy * increment;
-                        delta += dx * increment;
+                    let [dx, dy] = event.get_scroll_delta();
+                    delta = dy * increment;
+                    delta += dx * increment;
                     break;
             }
             
@@ -447,6 +447,7 @@ var Preview = Utils.defineClass({
 
         closeButton.connect('clicked', () => this._onCloseBtnClick());
         this.connect('notify::hover', () => this._onHoverChanged());
+        this.connect('button-release-event', (actor, e) => this._onButtonReleaseEvent(e));
 
         this.add_actor(this._previewBin);
         this.add_child(this._closeButtonBin);
@@ -486,6 +487,22 @@ var Preview = Utils.defineClass({
         this.window.delete(global.get_current_time());
     },
 
+    _onButtonReleaseEvent: function(e) {
+        switch (e.get_button()) {
+            case 1: // Left click
+                Main.activateWindow(this.window);
+                this._previewMenu.close();
+                break;
+            case 2: // Middle click
+                if (this._previewMenu._dtpSettings.get_boolean('preview-middle-click-close')) {
+                    this._onCloseBtnClick();
+                }
+                break;
+        }
+
+        return Clutter.EVENT_STOP;
+    },
+
     _addClone: function(newClone, animateSize) {
         let currentClones = this._previewBin.get_children();
         let newCloneOpts = getTweenOpts({ opacity: 255 });