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| 1 <!-- | |
| 2 Copyright (c) 2014 The Polymer Project Authors. All rights reserved. | |
| 3 This code may only be used under the BSD style license found at http://polymer.g
ithub.io/LICENSE.txt | |
| 4 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt | |
| 5 The complete set of contributors may be found at http://polymer.github.io/CONTRI
BUTORS.txt | |
| 6 Code distributed by Google as part of the polymer project is also | |
| 7 subject to an additional IP rights grant found at http://polymer.github.io/PATEN
TS.txt | |
| 8 --> | |
| 9 | |
| 10 <!-- | |
| 11 `core-scroll-header-panel` contains a header section and a content section. The | |
| 12 header is initially on the top part of the view but it scrolls away with the | |
| 13 rest of the scrollable content. Upon scrolling slightly up at any point, the | |
| 14 header scrolls back into view. This saves screen space and allows users to | |
| 15 access important controls by easily moving them back to the view. | |
| 16 | |
| 17 __Important:__ The `core-scroll-header-panel` will not display if its parent doe
s not have a height. | |
| 18 | |
| 19 Using [layout attributes](http://www.polymer-project.org/docs/polymer/layout-att
rs.html), you can easily make the `core-scroll-header-panel` fill the screen | |
| 20 | |
| 21 <body fullbleed layout vertical> | |
| 22 <core-scroll-header-panel flex> | |
| 23 <core-toolbar> | |
| 24 <div>Hello World!</div> | |
| 25 </core-toolbar> | |
| 26 </core-scroll-header-panel> | |
| 27 </body> | |
| 28 | |
| 29 or, if you would prefer to do it in CSS, just give `html`, `body`, and `core-scr
oll-header-panel` a height of 100%: | |
| 30 | |
| 31 html, body { | |
| 32 height: 100%; | |
| 33 margin: 0; | |
| 34 } | |
| 35 core-scroll-header-panel { | |
| 36 height: 100%; | |
| 37 } | |
| 38 | |
| 39 `core-scroll-header-panel` works well with `core-toolbar` but can use any elemen
t | |
| 40 that represents a header by adding a `core-header` class to it. | |
| 41 | |
| 42 <core-scroll-header-panel> | |
| 43 <core-toolbar>Header</core-toolbar> | |
| 44 <div>Content goes here...</div> | |
| 45 </core-scroll-header-panel> | |
| 46 | |
| 47 @group Polymer Core Elements | |
| 48 @element core-scroll-header-panel | |
| 49 @homepage github.io | |
| 50 --> | |
| 51 | |
| 52 <link rel="import" href="../polymer/polymer.html"> | |
| 53 <link rel="import" href="../core-resizable/core-resizable.html"> | |
| 54 | |
| 55 <polymer-element name="core-scroll-header-panel"> | |
| 56 <template> | |
| 57 | |
| 58 <link rel="stylesheet" href="core-scroll-header-panel.css"> | |
| 59 | |
| 60 <div id="mainContainer"> | |
| 61 | |
| 62 <content id="mainContent" select=":not(core-toolbar):not(.core-header)"></co
ntent> | |
| 63 | |
| 64 </div> | |
| 65 | |
| 66 <div id="headerContainer"> | |
| 67 | |
| 68 <div class="bg-container"> | |
| 69 <div id="condensedHeaderBg"></div> | |
| 70 <div id="headerBg"></div> | |
| 71 </div> | |
| 72 | |
| 73 <content id="headerContent" select="core-toolbar, .core-header"></content> | |
| 74 | |
| 75 </div> | |
| 76 | |
| 77 </template> | |
| 78 <script> | |
| 79 (function() { | |
| 80 | |
| 81 Polymer(Polymer.mixin({ | |
| 82 | |
| 83 /** | |
| 84 * Fired when the content has been scrolled. | |
| 85 * | |
| 86 * @event scroll | |
| 87 */ | |
| 88 | |
| 89 /** | |
| 90 * Fired when the header is transformed. | |
| 91 * | |
| 92 * @event core-header-transform | |
| 93 */ | |
| 94 | |
| 95 publish: { | |
| 96 /** | |
| 97 * If true, the header's height will condense to `_condensedHeaderHeight` | |
| 98 * as the user scrolls down from the top of the content area. | |
| 99 * | |
| 100 * @attribute condenses | |
| 101 * @type boolean | |
| 102 * @default false | |
| 103 */ | |
| 104 condenses: false, | |
| 105 | |
| 106 /** | |
| 107 * If true, no cross-fade transition from one background to another. | |
| 108 * | |
| 109 * @attribute noDissolve | |
| 110 * @type boolean | |
| 111 * @default false | |
| 112 */ | |
| 113 noDissolve: false, | |
| 114 | |
| 115 /** | |
| 116 * If true, the header doesn't slide back in when scrolling back up. | |
| 117 * | |
| 118 * @attribute noReveal | |
| 119 * @type boolean | |
| 120 * @default false | |
| 121 */ | |
| 122 noReveal: false, | |
| 123 | |
| 124 /** | |
| 125 * If true, the header is fixed to the top and never moves away. | |
| 126 * | |
| 127 * @attribute fixed | |
| 128 * @type boolean | |
| 129 * @default false | |
| 130 */ | |
| 131 fixed: false, | |
| 132 | |
| 133 /** | |
| 134 * If true, the condensed header is always shown and does not move away. | |
| 135 * | |
| 136 * @attribute keepCondensedHeader | |
| 137 * @type boolean | |
| 138 * @default false | |
| 139 */ | |
| 140 keepCondensedHeader: false, | |
| 141 | |
| 142 /** | |
| 143 * The height of the header when it is at its full size. | |
| 144 * | |
| 145 * By default, the height will be measured when it is ready. If the heigh
t | |
| 146 * changes later the user needs to either set this value to reflect the | |
| 147 * new height or invoke `measureHeaderHeight()`. | |
| 148 * | |
| 149 * @attribute headerHeight | |
| 150 * @type number | |
| 151 * @default 0 | |
| 152 */ | |
| 153 headerHeight: 0, | |
| 154 | |
| 155 /** | |
| 156 * The height of the header when it is condensed. | |
| 157 * | |
| 158 * By default, `_condensedHeaderHeight` is 1/3 of `headerHeight` unless | |
| 159 * this is specified. | |
| 160 * | |
| 161 * @attribute condensedHeaderHeight | |
| 162 * @type number | |
| 163 * @default 0 | |
| 164 */ | |
| 165 condensedHeaderHeight: 0, | |
| 166 | |
| 167 /** | |
| 168 * By default, the top part of the header stays when the header is being | |
| 169 * condensed. Set this to true if you want the top part of the header | |
| 170 * to be scrolled away. | |
| 171 * | |
| 172 * @attribute scrollAwayTopbar | |
| 173 * @type boolean | |
| 174 * @default false | |
| 175 */ | |
| 176 scrollAwayTopbar: false | |
| 177 }, | |
| 178 | |
| 179 prevScrollTop: 0, | |
| 180 | |
| 181 headerMargin: 0, | |
| 182 | |
| 183 y: 0, | |
| 184 | |
| 185 observe: { | |
| 186 'headerMargin fixed': 'setup' | |
| 187 }, | |
| 188 | |
| 189 eventDelegates: { | |
| 190 'core-resize': 'measureHeaderHeight' | |
| 191 }, | |
| 192 | |
| 193 attached: function() { | |
| 194 this.resizableAttachedHandler(); | |
| 195 }, | |
| 196 | |
| 197 ready: function() { | |
| 198 this._scrollHandler = this.scroll.bind(this); | |
| 199 this.scroller.addEventListener('scroll', this._scrollHandler); | |
| 200 }, | |
| 201 | |
| 202 detached: function() { | |
| 203 this.scroller.removeEventListener('scroll', this._scrollHandler); | |
| 204 this.resizableDetachedHandler(); | |
| 205 }, | |
| 206 | |
| 207 domReady: function() { | |
| 208 this.async('measureHeaderHeight'); | |
| 209 }, | |
| 210 | |
| 211 get header() { | |
| 212 return this.$.headerContent.getDistributedNodes()[0]; | |
| 213 }, | |
| 214 | |
| 215 /** | |
| 216 * Returns the scrollable element. | |
| 217 * | |
| 218 * @property scroller | |
| 219 * @type Object | |
| 220 */ | |
| 221 get scroller() { | |
| 222 return this.$.mainContainer; | |
| 223 }, | |
| 224 | |
| 225 /** | |
| 226 * Invoke this to tell `core-scroll-header-panel` to re-measure the header's | |
| 227 * height. | |
| 228 * | |
| 229 * @method measureHeaderHeight | |
| 230 */ | |
| 231 measureHeaderHeight: function() { | |
| 232 var header = this.header; | |
| 233 if (header && header.offsetHeight) { | |
| 234 this.headerHeight = header.offsetHeight; | |
| 235 } | |
| 236 }, | |
| 237 | |
| 238 headerHeightChanged: function() { | |
| 239 if (!this.condensedHeaderHeight) { | |
| 240 // assume _condensedHeaderHeight is 1/3 of the headerHeight | |
| 241 this._condensedHeaderHeight = this.headerHeight * 1 / 3; | |
| 242 } | |
| 243 this.condensedHeaderHeightChanged(); | |
| 244 }, | |
| 245 | |
| 246 condensedHeaderHeightChanged: function() { | |
| 247 if (this.condensedHeaderHeight) { | |
| 248 this._condensedHeaderHeight = this.condensedHeaderHeight; | |
| 249 } | |
| 250 if (this.headerHeight) { | |
| 251 this.headerMargin = this.headerHeight - this._condensedHeaderHeight; | |
| 252 } | |
| 253 }, | |
| 254 | |
| 255 condensesChanged: function() { | |
| 256 if (this.condenses) { | |
| 257 this.scroll(); | |
| 258 } else { | |
| 259 // reset transform/opacity set on the header | |
| 260 this.condenseHeader(null); | |
| 261 } | |
| 262 }, | |
| 263 | |
| 264 setup: function() { | |
| 265 var s = this.scroller.style; | |
| 266 s.paddingTop = this.fixed ? '' : this.headerHeight + 'px'; | |
| 267 s.top = this.fixed ? this.headerHeight + 'px' : ''; | |
| 268 if (this.fixed) { | |
| 269 this.transformHeader(null); | |
| 270 } else { | |
| 271 this.scroll(); | |
| 272 } | |
| 273 }, | |
| 274 | |
| 275 transformHeader: function(y) { | |
| 276 var s = this.$.headerContainer.style; | |
| 277 this.translateY(s, -y); | |
| 278 | |
| 279 if (this.condenses) { | |
| 280 this.condenseHeader(y); | |
| 281 } | |
| 282 | |
| 283 this.fire('core-header-transform', {y: y, height: this.headerHeight, | |
| 284 condensedHeight: this._condensedHeaderHeight}); | |
| 285 }, | |
| 286 | |
| 287 condenseHeader: function(y) { | |
| 288 var reset = y == null; | |
| 289 // adjust top bar in core-header so the top bar stays at the top | |
| 290 if (!this.scrollAwayTopbar && this.header.$ && this.header.$.topBar) { | |
| 291 this.translateY(this.header.$.topBar.style, | |
| 292 reset ? null : Math.min(y, this.headerMargin)); | |
| 293 } | |
| 294 // transition header bg | |
| 295 var hbg = this.$.headerBg.style; | |
| 296 if (!this.noDissolve) { | |
| 297 hbg.opacity = reset ? '' : (this.headerMargin - y) / this.headerMargin; | |
| 298 } | |
| 299 // adjust header bg so it stays at the center | |
| 300 this.translateY(hbg, reset ? null : y / 2); | |
| 301 // transition condensed header bg | |
| 302 var chbg = this.$.condensedHeaderBg.style; | |
| 303 if (!this.noDissolve) { | |
| 304 chbg = this.$.condensedHeaderBg.style; | |
| 305 chbg.opacity = reset ? '' : y / this.headerMargin; | |
| 306 // adjust condensed header bg so it stays at the center | |
| 307 this.translateY(chbg, reset ? null : y / 2); | |
| 308 } | |
| 309 }, | |
| 310 | |
| 311 translateY: function(s, y) { | |
| 312 var t = y == null ? '' : 'translate3d(0, ' + y + 'px, 0)'; | |
| 313 setTransform(s, t); | |
| 314 }, | |
| 315 | |
| 316 scroll: function(event) { | |
| 317 if (!this.header) { | |
| 318 return; | |
| 319 } | |
| 320 | |
| 321 var sTop = this.scroller.scrollTop; | |
| 322 | |
| 323 var y = Math.min(this.keepCondensedHeader ? | |
| 324 this.headerMargin : this.headerHeight, Math.max(0, | |
| 325 (this.noReveal ? sTop : this.y + sTop - this.prevScrollTop))); | |
| 326 | |
| 327 if (this.condenses && this.prevScrollTop >= sTop && sTop > this.headerMarg
in) { | |
| 328 y = Math.max(y, this.headerMargin); | |
| 329 } | |
| 330 | |
| 331 if (!event || !this.fixed && y !== this.y) { | |
| 332 this.transformHeader(y); | |
| 333 } | |
| 334 | |
| 335 this.prevScrollTop = Math.max(sTop, 0); | |
| 336 this.y = y; | |
| 337 | |
| 338 if (event) { | |
| 339 this.fire('scroll', {target: this.scroller}, this, false); | |
| 340 } | |
| 341 } | |
| 342 | |
| 343 }, Polymer.CoreResizable)); | |
| 344 | |
| 345 //determine proper transform mechanizm | |
| 346 if (document.documentElement.style.transform !== undefined) { | |
| 347 var setTransform = function(style, string) { | |
| 348 style.transform = string; | |
| 349 } | |
| 350 } else { | |
| 351 var setTransform = function(style, string) { | |
| 352 style.webkitTransform = string; | |
| 353 } | |
| 354 } | |
| 355 | |
| 356 })(); | |
| 357 | |
| 358 </script> | |
| 359 </polymer-element> | |
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Chromium Code Reviews
Issue 1215543002:
Remove Polymer 0.5. (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master