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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 /** | 5 /** |
| 6 * @fileoverview DragWrapper | 6 * @fileoverview DragWrapper |
| 7 * A class for simplifying HTML5 drag and drop. Classes should use this to | 7 * A class for simplifying HTML5 drag and drop. Classes should use this to |
| 8 * handle the nitty gritty of nested drag enters and leaves. | 8 * handle the nitty gritty of nested drag enters and leaves. |
| 9 */ | 9 */ |
| 10 cr.define('cr.ui', function() { | 10 cr.define('cr.ui', function() { |
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| 34 doDrop: assertNotReached, | 34 doDrop: assertNotReached, |
| 35 }; | 35 }; |
| 36 | 36 |
| 37 /** | 37 /** |
| 38 * Creates a DragWrapper which listens for drag target events on |target| and | 38 * Creates a DragWrapper which listens for drag target events on |target| and |
| 39 * delegates event handling to |delegate|. | 39 * delegates event handling to |delegate|. |
| 40 * @param {!Element} target | 40 * @param {!Element} target |
| 41 * @param {!cr.ui.DragWrapperDelegate} delegate | 41 * @param {!cr.ui.DragWrapperDelegate} delegate |
| 42 * @constructor | 42 * @constructor |
| 43 */ | 43 */ |
| 44 function DragWrapper(target, delegate) { | 44 function DragWrapper(target, delegate) { this.initialize(target, delegate); } |
| 45 this.initialize(target, delegate); | |
| 46 } | |
| 47 | 45 |
| 48 DragWrapper.prototype = { | 46 DragWrapper.prototype = { |
| 49 initialize: function(target, delegate) { | 47 initialize: function(target, delegate) { |
| 50 target.addEventListener('dragenter', | 48 target.addEventListener('dragenter', this.onDragEnter_.bind(this)); |
| 51 this.onDragEnter_.bind(this)); | |
| 52 target.addEventListener('dragover', this.onDragOver_.bind(this)); | 49 target.addEventListener('dragover', this.onDragOver_.bind(this)); |
| 53 target.addEventListener('drop', this.onDrop_.bind(this)); | 50 target.addEventListener('drop', this.onDrop_.bind(this)); |
| 54 target.addEventListener('dragleave', this.onDragLeave_.bind(this)); | 51 target.addEventListener('dragleave', this.onDragLeave_.bind(this)); |
| 55 | 52 |
| 56 this.target_ = target; | 53 this.target_ = target; |
| 57 this.delegate_ = delegate; | 54 this.delegate_ = delegate; |
| 58 }, | 55 }, |
| 59 | 56 |
| 60 /** | 57 /** |
| 61 * The number of un-paired dragenter events that have fired on |this|. This | 58 * The number of un-paired dragenter events that have fired on |this|. This |
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| 134 this.target_.classList.remove('drag-target'); | 131 this.target_.classList.remove('drag-target'); |
| 135 this.delegate_.doDragLeave(e); | 132 this.delegate_.doDragLeave(e); |
| 136 }, | 133 }, |
| 137 }; | 134 }; |
| 138 | 135 |
| 139 return { | 136 return { |
| 140 DragWrapper: DragWrapper, | 137 DragWrapper: DragWrapper, |
| 141 DragWrapperDelegate: DragWrapperDelegate, | 138 DragWrapperDelegate: DragWrapperDelegate, |
| 142 }; | 139 }; |
| 143 }); | 140 }); |
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