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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 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 Behavior for scrollable containers with <iron-list>. | 6 * @fileoverview Behavior for scrollable containers with <iron-list>. |
7 * | 7 * |
8 * Any containers with the 'scrollable' attribute set will have the following | 8 * Any containers with the 'scrollable' attribute set will have the following |
9 * classes toggled appropriately: can-scroll, is-scrolled, scrolled-to-bottom. | 9 * classes toggled appropriately: can-scroll, is-scrolled, scrolled-to-bottom. |
10 * These classes are used to style the container div and list elements | 10 * These classes are used to style the container div and list elements |
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31 * | 31 * |
32 * NOTE: If 'container' is not fixed size, it is important to call | 32 * NOTE: If 'container' is not fixed size, it is important to call |
33 * updateScrollableContents() when [[items]] changes, otherwise the container | 33 * updateScrollableContents() when [[items]] changes, otherwise the container |
34 * will not be sized correctly. | 34 * will not be sized correctly. |
35 */ | 35 */ |
36 | 36 |
37 /** @polymerBehavior */ | 37 /** @polymerBehavior */ |
38 var CrScrollableBehavior = { | 38 var CrScrollableBehavior = { |
39 properties: { | 39 properties: { |
40 /** @private {number|null} */ | 40 /** @private {number|null} */ |
41 intervalId_: { | 41 intervalId_: {type: Number, value: null} |
42 type: Number, | |
43 value: null | |
44 } | |
45 }, | 42 }, |
46 | 43 |
47 ready: function() { | 44 ready: function() { |
48 var scrollableElements = this.root.querySelectorAll('[scrollable]'); | 45 var scrollableElements = this.root.querySelectorAll('[scrollable]'); |
49 | 46 |
50 // Setup the intial scrolling related classes for each scrollable container. | 47 // Setup the intial scrolling related classes for each scrollable container. |
51 requestAnimationFrame(function() { | 48 requestAnimationFrame(function() { |
52 for (let scrollable of scrollableElements) | 49 for (let scrollable of scrollableElements) |
53 this.updateScroll_(scrollable); | 50 this.updateScroll_(scrollable); |
54 }.bind(this)); | 51 }.bind(this)); |
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110 */ | 107 */ |
111 updateScroll_: function(scrollable) { | 108 updateScroll_: function(scrollable) { |
112 scrollable.classList.toggle( | 109 scrollable.classList.toggle( |
113 'can-scroll', scrollable.clientHeight < scrollable.scrollHeight); | 110 'can-scroll', scrollable.clientHeight < scrollable.scrollHeight); |
114 scrollable.classList.toggle('is-scrolled', scrollable.scrollTop > 0); | 111 scrollable.classList.toggle('is-scrolled', scrollable.scrollTop > 0); |
115 scrollable.classList.toggle( | 112 scrollable.classList.toggle( |
116 'scrolled-to-bottom', scrollable.scrollTop + scrollable.clientHeight >= | 113 'scrolled-to-bottom', scrollable.scrollTop + scrollable.clientHeight >= |
117 scrollable.scrollHeight); | 114 scrollable.scrollHeight); |
118 }, | 115 }, |
119 }; | 116 }; |
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