chrome/browser/resources/ntp4/trash.js

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * @fileoverview Trash
   7  * This is the class for the trash can that appears when dragging an app.
   8  */
   9
  10 cr.define('ntp', function() {
  11   'use strict';
  12
  13   /**
  14    * @constructor
  15    */
  16   function Trash(trash) {
  17     trash.__proto__ = Trash.prototype;
  18     trash.initialize();
  19     return trash;
  20   }
  21
  22   Trash.prototype = {
  23     __proto__: HTMLDivElement.prototype,
  24
  25     initialize: function(element) {
  26       this.dragWrapper_ = new cr.ui.DragWrapper(this, this);
  27     },
  28
  29     /**
  30      * Determines whether we are interested in the drag data for |e|.
  31      * @param {Event} e The event from drag enter.
  32      * @return {boolean} True if we are interested in the drag data for |e|.
  33      */
  34     shouldAcceptDrag: function(e) {
  35       var tile = ntp.getCurrentlyDraggingTile();
  36       if (!tile)
  37         return false;
  38
  39       return tile.firstChild.canBeRemoved();
  40     },
  41
  42     /**
  43      * Drag over handler.
  44      * @param {Event} e The drag event.
  45      */
  46     doDragOver: function(e) {
  47       ntp.getCurrentlyDraggingTile().dragClone.classList.add(
  48           'hovering-on-trash');
  49       ntp.setCurrentDropEffect(e.dataTransfer, 'move');
  50       e.preventDefault();
  51     },
  52
  53     /**
  54      * Drag enter handler.
  55      * @param {Event} e The drag event.
  56      */
  57     doDragEnter: function(e) {
  58       this.doDragOver(e);
  59     },
  60
  61     /**
  62      * Drop handler.
  63      * @param {Event} e The drag event.
  64      */
  65     doDrop: function(e) {
  66       e.preventDefault();
  67
  68       var tile = ntp.getCurrentlyDraggingTile();
  69       tile.firstChild.removeFromChrome();
  70       tile.landedOnTrash = true;
  71     },
  72
  73     /**
  74      * Drag leave handler.
  75      * @param {Event} e The drag event.
  76      */
  77     doDragLeave: function(e) {
  78       ntp.getCurrentlyDraggingTile().dragClone.classList.remove(
  79           'hovering-on-trash');
  80     },
  81   };
  82
  83   return {
  84     Trash: Trash,
  85   };
  86 });