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   function Trash(trash) {
  14     trash.__proto__ = Trash.prototype;
  15     trash.initialize();
  16     return trash;
  17   }
  18
  19   Trash.prototype = {
  20     __proto__: HTMLDivElement.prototype,
  21
  22     initialize: function(element) {
  23       this.dragWrapper_ = new cr.ui.DragWrapper(this, this);
  24     },
  25
  26     /**
  27      * Determines whether we are interested in the drag data for |e|.
  28      * @param {Event} e The event from drag enter.
  29      * @return {boolean} True if we are interested in the drag data for |e|.
  30      */
  31     shouldAcceptDrag: function(e) {
  32       var tile = ntp.getCurrentlyDraggingTile();
  33       if (!tile)
  34         return false;
  35
  36       return tile.firstChild.canBeRemoved();
  37     },
  38
  39     /**
  40      * Drag over handler.
  41      * @param {Event} e The drag event.
  42      */
  43     doDragOver: function(e) {
  44       ntp.getCurrentlyDraggingTile().dragClone.classList.add(
  45           'hovering-on-trash');
  46       ntp.setCurrentDropEffect(e.dataTransfer, 'move');
  47       e.preventDefault();
  48     },
  49
  50     /**
  51      * Drag enter handler.
  52      * @param {Event} e The drag event.
  53      */
  54     doDragEnter: function(e) {
  55       this.doDragOver(e);
  56     },
  57
  58     /**
  59      * Drop handler.
  60      * @param {Event} e The drag event.
  61      */
  62     doDrop: function(e) {
  63       e.preventDefault();
  64
  65       var tile = ntp.getCurrentlyDraggingTile();
  66       tile.firstChild.removeFromChrome();
  67       tile.landedOnTrash = true;
  68     },
  69
  70     /**
  71      * Drag leave handler.
  72      * @param {Event} e The drag event.
  73      */
  74     doDragLeave: function(e) {
  75       ntp.getCurrentlyDraggingTile().dragClone.classList.remove(
  76           'hovering-on-trash');
  77     },
  78   };
  79
  80   return {
  81     Trash: Trash,
  82   };
  83 });