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| 1 |
| 2 |
| 3 Polymer('core-header-panel', { |
| 4 |
| 5 /** |
| 6 * Fired when the content has been scrolled. `details.target` returns |
| 7 * the scrollable element which you can use to access scroll info such as |
| 8 * `scrollTop`. |
| 9 * |
| 10 * @event scroll |
| 11 */ |
| 12 |
| 13 publish: { |
| 14 /** |
| 15 * Controls header and scrolling behavior. Options are |
| 16 * `standard`, `seamed`, `waterfall`, `waterfall-tall`, |
| 17 * `waterfall-medium-tall`, `scroll` and `cover`. |
| 18 * Default is `standard`. |
| 19 * |
| 20 * `standard`: The header is a step above the panel. The header will consu
me the |
| 21 * panel at the point of entry, preventing it from passing through to the |
| 22 * opposite side. |
| 23 * |
| 24 * `seamed`: The header is presented as seamed with the panel. |
| 25 * |
| 26 * `waterfall`: Similar to standard mode, but header is initially presente
d as |
| 27 * seamed with panel, but then separates to form the step. |
| 28 * |
| 29 * `waterfall-tall`: The header is initially taller (`tall` class is added
to |
| 30 * the header). As the user scrolls, the header separates (forming an edg
e) |
| 31 * while condensing (`tall` class is removed from the header). |
| 32 * |
| 33 * `scroll`: The header keeps its seam with the panel, and is pushed off s
creen. |
| 34 * |
| 35 * `cover`: The panel covers the whole `core-header-panel` including the |
| 36 * header. This allows user to style the panel in such a way that the pane
l is |
| 37 * partially covering the header. |
| 38 * |
| 39 * <style> |
| 40 * core-header-panel[mode=cover]::shadow #mainContainer { |
| 41 * left: 80px; |
| 42 * } |
| 43 * .content { |
| 44 * margin: 60px 60px 60px 0; |
| 45 * } |
| 46 * </style> |
| 47 * |
| 48 * <core-header-panel mode="cover"> |
| 49 * <core-appbar class="tall"> |
| 50 * <core-icon-button icon="menu"></core-icon-button> |
| 51 * </core-appbar> |
| 52 * <div class="content"></div> |
| 53 * </core-header-panel> |
| 54 * |
| 55 * @attribute mode |
| 56 * @type string |
| 57 * @default '' |
| 58 */ |
| 59 mode: {value: '', reflect: true}, |
| 60 |
| 61 /** |
| 62 * The class used in waterfall-tall mode. Change this if the header |
| 63 * accepts a different class for toggling height, e.g. "medium-tall" |
| 64 * |
| 65 * @attribute tallClass |
| 66 * @type string |
| 67 * @default 'tall' |
| 68 */ |
| 69 tallClass: 'tall', |
| 70 |
| 71 /** |
| 72 * If true, the drop-shadow is always shown no matter what mode is set to. |
| 73 * |
| 74 * @attribute shadow |
| 75 * @type boolean |
| 76 * @default false |
| 77 */ |
| 78 shadow: false |
| 79 }, |
| 80 |
| 81 domReady: function() { |
| 82 this.async('scroll'); |
| 83 }, |
| 84 |
| 85 modeChanged: function() { |
| 86 this.scroll(); |
| 87 }, |
| 88 |
| 89 get header() { |
| 90 return this.$.headerContent.getDistributedNodes()[0]; |
| 91 }, |
| 92 |
| 93 /** |
| 94 * Returns the scrollable element. |
| 95 * |
| 96 * @property scroller |
| 97 * @type Object |
| 98 */ |
| 99 get scroller() { |
| 100 return this.mode === 'scroll' ? |
| 101 this.$.outerContainer : this.$.mainContainer; |
| 102 }, |
| 103 |
| 104 scroll: function() { |
| 105 var shadowMode = {'waterfall': 1, 'waterfall-tall': 1}; |
| 106 var noShadow = {'seamed': 1, 'cover': 1, 'scroll': 1}; |
| 107 var tallMode = {'waterfall-tall': 1}; |
| 108 |
| 109 var main = this.$.mainContainer; |
| 110 var header = this.header; |
| 111 |
| 112 var sTop = main.scrollTop; |
| 113 var atTop = sTop === 0; |
| 114 |
| 115 if (header) { |
| 116 this.$.dropShadow.classList.toggle('hidden', !this.shadow && |
| 117 (atTop && shadowMode[this.mode] || noShadow[this.mode])); |
| 118 |
| 119 if (tallMode[this.mode]) { |
| 120 header.classList.toggle(this.tallClass, atTop || |
| 121 main.scrollHeight < this.$.outerContainer.offsetHeight); |
| 122 } |
| 123 |
| 124 header.classList.toggle('animate', tallMode[this.mode]); |
| 125 } |
| 126 |
| 127 this.fire('scroll', {target: this.scroller}, this, false); |
| 128 } |
| 129 |
| 130 }); |
| 131 |
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