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Unified Diff: third_party/polymer/components/core-scroll-header-panel/core-scroll-header-panel.html

Issue 582873003: Polymer elements added to third_party/polymer. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 3 months ago
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Index: third_party/polymer/components/core-scroll-header-panel/core-scroll-header-panel.html
diff --git a/third_party/polymer/components/core-scroll-header-panel/core-scroll-header-panel.html b/third_party/polymer/components/core-scroll-header-panel/core-scroll-header-panel.html
new file mode 100644
index 0000000000000000000000000000000000000000..ae0f9e1eeb55b7eda27842e734f71970941b854d
--- /dev/null
+++ b/third_party/polymer/components/core-scroll-header-panel/core-scroll-header-panel.html
@@ -0,0 +1,302 @@
+<!--
+Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<!--
+`core-scroll-header-panel` contains a header section and a content section. The
+header is initially on the top part of the view but it scrolls away with the
+rest of the scrollable content. Upon scrolling slightly up at any point, the
+header scrolls back into view. This saves screen space and allows users to
+access important controls by easily moving them back to the view.
+
+__Important:__ The `core-scroll-header-panel` will not display if its parent does not have a height.
+
+Using [layout attributes](http://www.polymer-project.org/docs/polymer/layout-attrs.html), you can easily make the `core-scroll-header-panel` fill the screen
+
+ <body fullbleed layout vertical>
+ <core-scroll-header-panel flex>
+ <core-toolbar>
+ <div>Hello World!</div>
+ </core-toolbar>
+ </core-scroll-header-panel>
+ </body>
+
+or, if you would prefer to do it in CSS, just give `html`, `body`, and `core-scroll-header-panel` a height of 100%:
+
+ html, body {
+ height: 100%;
+ margin: 0;
+ }
+ core-scroll-header-panel {
+ height: 100%;
+ }
+
+`core-scroll-header-panel` works well with `core-toolbar` but can use any element
+that represents a header by adding a `core-header` class to it. Use the attribute
+or class `content` to delineate the content section.
+
+ <core-scroll-header-panel>
+ <core-toolbar>Header</core-toolbar>
+ <div content>Content goes here...</div>
+ </core-scroll-header-panel>
+
+@group Polymer Core Elements
+@element core-scroll-header-panel
+@homepage github.io
+-->
+
+<link rel="import" href="../polymer/polymer.html">
+
+<polymer-element name="core-scroll-header-panel">
+<template>
+
+ <link rel="stylesheet" href="core-scroll-header-panel.css">
+
+ <div id="mainContainer" on-scroll="{{scroll}}">
+
+ <content id="mainContent" select="[content], .content"></content>
+
+ </div>
+
+ <div id="headerContainer">
+
+ <div class="bg-container">
+ <div id="condensedHeaderBg"></div>
+ <div id="headerBg"></div>
+ </div>
+
+ <content id="headerContent" select="core-toolbar, .core-header"></content>
+
+ </div>
+
+</template>
+<script>
+
+ Polymer('core-scroll-header-panel', {
+
+ /**
+ * Fired when the content has been scrolled.
+ *
+ * @event scroll
+ */
+
+ /**
+ * Fired when the header is transformed.
+ *
+ * @event core-header-transform
+ */
+
+ publish: {
+ /**
+ * If true, the header's height will condense to `_condensedHeaderHeight`
+ * as the user scrolls down from the top of the content area.
+ *
+ * @attribute condenses
+ * @type boolean
+ * @default false
+ */
+ condenses: false,
+
+ /**
+ * If true, no cross-fade transition from one background to another.
+ *
+ * @attribute noDissolve
+ * @type boolean
+ * @default false
+ */
+ noDissolve: false,
+
+ /**
+ * If true, the header doesn't slide back in when scrolling back up.
+ *
+ * @attribute noReveal
+ * @type boolean
+ * @default false
+ */
+ noReveal: false,
+
+ /**
+ * If true, the header is fixed to the top and never moves away.
+ *
+ * @attribute fixed
+ * @type boolean
+ * @default false
+ */
+ fixed: false,
+
+ /**
+ * If true, the condensed header is always shown and does not move away.
+ *
+ * @attribute keepCondensedHeader
+ * @type boolean
+ * @default false
+ */
+ keepCondensedHeader: false,
+
+ /**
+ * The height of the header when it is at its full size.
+ *
+ * By default, the height will be measured when it is ready. If the height
+ * changes later the user needs to either set this value to reflect the
+ * new height or invoke `measureHeaderHeight()`.
+ *
+ * @attribute headerHeight
+ * @type number
+ */
+ headerHeight: 0,
+
+ /**
+ * The height of the header when it is condensed.
+ *
+ * By default, `_condensedHeaderHeight` is 1/3 of `headerHeight` unless
+ * this is specified.
+ *
+ * @attribute condensedHeaderHeight
+ * @type number
+ */
+ condensedHeaderHeight: 0
+ },
+
+ prevScrollTop: 0,
+
+ headerMargin: 0,
+
+ y: 0,
+
+ observe: {
+ 'headerMargin fixed': 'setup'
+ },
+
+ domReady: function() {
+ this.async('measureHeaderHeight');
+ },
+
+ get header() {
+ return this.$.headerContent.getDistributedNodes()[0];
+ },
+
+ get scroller() {
+ return this.$.mainContainer;
+ },
+
+ measureHeaderHeight: function() {
+ var header = this.header;
+ if (this.header) {
+ this.headerHeight = header.offsetHeight;
+ }
+ },
+
+ headerHeightChanged: function() {
+ if (!this.condensedHeaderHeight) {
+ // assume _condensedHeaderHeight is 1/3 of the headerHeight
+ this._condensedHeaderHeight = this.headerHeight * 1 / 3;
+ }
+ this.condensedHeaderHeightChanged();
+ },
+
+ condensedHeaderHeightChanged: function() {
+ if (this.condensedHeaderHeight) {
+ this._condensedHeaderHeight = this.condensedHeaderHeight;
+ }
+ if (this.headerHeight) {
+ this.headerMargin = this.headerHeight - this._condensedHeaderHeight;
+ }
+ },
+
+ condensesChanged: function() {
+ if (this.condenses) {
+ this.scroll();
+ } else {
+ // reset transform/opacity set on the header
+ this.condenseHeader(null);
+ }
+ },
+
+ setup: function() {
+ var s = this.scroller.style;
+ s.paddingTop = this.fixed ? '' : this.headerHeight + 'px';
+ s.top = this.fixed ? this.headerHeight + 'px' : '';
+ if (this.fixed) {
+ this.transformHeader(null);
+ } else {
+ this.scroll();
+ }
+ },
+
+ transformHeader: function(y) {
+ var s = this.$.headerContainer.style;
+ this.translateY(s, -y);
+
+ if (this.condenses) {
+ this.condenseHeader(y);
+ }
+
+ this.fire('core-header-transform', {y: y, height: this.headerHeight,
+ condensedHeight: this._condensedHeaderHeight});
+ },
+
+ condenseHeader: function(y) {
+ var reset = y == null;
+ // adjust top bar in core-header so the top bar stays at the top
+ if (this.header.$ && this.header.$.topBar) {
+ this.translateY(this.header.$.topBar.style,
+ reset ? null : Math.min(y, this.headerMargin));
+ }
+ // transition header bg
+ var hbg = this.$.headerBg.style;
+ if (!this.noDissolve) {
+ hbg.opacity = reset ? '' : (this.headerMargin - y) / this.headerMargin;
+ }
+ // adjust header bg so it stays at the center
+ this.translateY(hbg, reset ? null : y / 2);
+ // transition condensed header bg
+ var chbg = this.$.condensedHeaderBg.style;
+ if (!this.noDissolve) {
+ chbg = this.$.condensedHeaderBg.style;
+ chbg.opacity = reset ? '' : y / this.headerMargin;
+ // adjust condensed header bg so it stays at the center
+ this.translateY(chbg, reset ? null : y / 2);
+ }
+ },
+
+ translateY: function(s, y) {
+ s.transform = s.webkitTransform = y == null ? '' :
+ 'translate3d(0, ' + y + 'px, 0)';
+ },
+
+ scroll: function(event) {
+ if (!this.header) {
+ return;
+ }
+
+ var sTop = this.scroller.scrollTop;
+
+ var y = Math.min(this.keepCondensedHeader ?
+ this.headerMargin : this.headerHeight, Math.max(0,
+ (this.noReveal ? sTop : this.y + sTop - this.prevScrollTop)));
+
+ if (this.condenses && this.prevScrollTop >= sTop && sTop > this.headerMargin) {
+ y = Math.max(y, this.headerMargin);
+ }
+
+ if (!event || !this.fixed && y !== this.y) {
+ requestAnimationFrame(this.transformHeader.bind(this, y));
+ }
+
+ this.prevScrollTop = sTop;
+ this.y = y;
+
+ if (event) {
+ this.fire('scroll', {target: this.scroller}, this, false);
+ }
+ }
+
+ });
+
+</script>
+</polymer-element>
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