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I_changed_another_theme
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<!--
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@license
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Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
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This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
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The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
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The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
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Code distributed by Google as part of the polymer project is also
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subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
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-->
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<link rel="import" href="../polymer/polymer.html">
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<link rel="import" href="../iron-resizable-behavior/iron-resizable-behavior.html">
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<!--
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`paper-scroll-header-panel` contains a header section and a content section. The
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header is initially on the top part of the view but it scrolls away with the
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rest of the scrollable content. Upon scrolling slightly up at any point, the
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header scrolls back into view. This saves screen space and allows users to
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access important controls by easily moving them back to the view.
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__Important:__ The `paper-scroll-header-panel` will not display if its parent does not have a height.
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Using [layout classes](https://www.polymer-project.org/1.0/docs/migration.html#layout-attributes) or custom properties, you can easily make the `paper-scroll-header-panel` fill the screen
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<body class="fullbleed layout vertical">
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<paper-scroll-header-panel class="flex">
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<paper-toolbar>
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<div>Hello World!</div>
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</paper-toolbar>
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</paper-scroll-header-panel>
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</body>
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or, if you would prefer to do it in CSS, just give `html`, `body`, and `paper-scroll-header-panel` a height of 100%:
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html, body {
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height: 100%;
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margin: 0;
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}
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paper-scroll-header-panel {
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height: 100%;
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}
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`paper-scroll-header-panel` works well with `paper-toolbar` but can use any element
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that represents a header by adding a `paper-header` class to it.
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<paper-scroll-header-panel>
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<paper-toolbar>Header</paper-toolbar>
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<div>Content goes here...</div>
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</paper-scroll-header-panel>
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Styling scroll-header-panel:
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To change background for toolbar when it is at its full size:
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paper-scroll-header-panel {
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--paper-scroll-header-panel-full-header: {
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background-color: red;
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};
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}
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To change the background for toolbar when it is condensed:
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paper-scroll-header-panel {
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--paper-scroll-header-panel-condensed-header: {
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background-color: #f4b400;
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};
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}
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@group Paper Element
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@element paper-scroll-header-panel
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@demo demo/index.html
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@hero hero.svg
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-->
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<dom-module id="paper-scroll-header-panel">
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<style>
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:host {
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display: block;
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position: relative;
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overflow: hidden;
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}
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#mainContainer {
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position: absolute;
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top: 0;
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right: 0;
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bottom: 0;
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left: 0;
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-moz-box-sizing: border-box;
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box-sizing: border-box;
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-webkit-overflow-scrolling: touch;
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overflow-x: hidden;
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overflow-y: auto;
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-webkit-transform: translateZ(0);
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transform: translateZ(0);
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}
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#headerContainer {
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position: absolute;
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top: 0;
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right: 0;
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left: 0;
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}
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.bg-container {
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position: absolute;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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overflow: hidden;
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}
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#headerBg {
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@apply(--paper-scroll-header-panel-full-header);
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}
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#condensedHeaderBg {
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@apply(--paper-scroll-header-panel-condensed-header);
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}
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#headerBg, #condensedHeaderBg {
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position: absolute;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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background-repeat: no-repeat;
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background-size: cover;
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background-position: center center;
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}
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#condensedHeaderBg {
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opacity: 0;
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}
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</style>
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<template>
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<div id="mainContainer">
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<content id="mainContent" select=":not(paper-toolbar):not(.paper-header)"></content>
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</div>
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<div id="headerContainer">
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<div class="bg-container">
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<div id="condensedHeaderBg"></div>
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<div id="headerBg"></div>
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</div>
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<content id="headerContent" select="paper-toolbar, .paper-header"></content>
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</div>
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</template>
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</dom-module>
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<script>
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(function() {
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'use strict';
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Polymer({
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/**
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* Fired when the content has been scrolled.
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*
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* @event content-scroll
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*/
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/**
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* Fired when the header is transformed.
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*
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* @event paper-header-transform
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*/
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is: 'paper-scroll-header-panel',
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behaviors: [
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Polymer.IronResizableBehavior
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],
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properties: {
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/**
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* If true, the header's height will condense to `condensedHeaderHeight`
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* as the user scrolls down from the top of the content area.
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*/
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condenses: {
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type: Boolean,
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value: false,
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observer: '_condensesChanged'
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},
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/**
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* If true, no cross-fade transition from one background to another.
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*/
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noDissolve: {
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type: Boolean,
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value: false
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},
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/**
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* If true, the header doesn't slide back in when scrolling back up.
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*/
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noReveal: {
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type: Boolean,
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value: false
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},
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/**
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* If true, the header is fixed to the top and never moves away.
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*/
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fixed: {
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type: Boolean,
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value: false
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},
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/**
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* If true, the condensed header is always shown and does not move away.
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*/
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keepCondensedHeader: {
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type: Boolean,
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value: false
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},
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/**
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* The height of the header when it is at its full size.
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*
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* By default, the height will be measured when it is ready. If the height
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* changes later the user needs to either set this value to reflect the
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* new height or invoke `measureHeaderHeight()`.
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*/
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headerHeight: {
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type: Number,
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value: 0
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},
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/**
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* The height of the header when it is condensed.
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*
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* By default, `condensedHeaderHeight` is 1/3 of `headerHeight` unless
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* this is specified.
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*/
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condensedHeaderHeight: {
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type: Number,
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value: 0
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},
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/**
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* By default, the top part of the header stays when the header is being
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* condensed. Set this to true if you want the top part of the header
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* to be scrolled away.
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*/
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scrollAwayTopbar: {
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type: Boolean,
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value: false
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},
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_headerMargin: {
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type: Number
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},
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_prevScrollTop: {
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type: Number
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},
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_y: {
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type: Number
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}
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},
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observers: [
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'_setup(_headerMargin, headerHeight, fixed)',
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'_headerHeightChanged(headerHeight, condensedHeaderHeight)',
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'_condensedHeaderHeightChanged(headerHeight, condensedHeaderHeight)'
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],
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listeners: {
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'iron-resize': 'measureHeaderHeight'
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},
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ready: function() {
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this.async(this.measureHeaderHeight, 5);
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this._scrollHandler = this._scroll.bind(this);
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this.scroller.addEventListener('scroll', this._scrollHandler);
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},
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detached: function() {
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this.scroller.removeEventListener('scroll', this._scrollHandler);
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},
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/**
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* Returns the header element.
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*
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* @property header
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* @type Object
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*/
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get header() {
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return Polymer.dom(this.$.headerContent).getDistributedNodes()[0];
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},
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/**
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* Returns the content element.
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*
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* @property content
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* @type Object
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*/
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get content() {
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return Polymer.dom(this.$.mainContent).getDistributedNodes()[0];
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},
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/**
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* Returns the scrollable element.
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*
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* @property scroller
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* @type Object
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*/
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get scroller() {
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return this.$.mainContainer;
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},
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/**
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* Invoke this to tell `paper-scroll-header-panel` to re-measure the header's
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* height.
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*
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* @method measureHeaderHeight
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*/
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measureHeaderHeight: function() {
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var header = this.header;
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if (header && header.offsetHeight) {
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this.headerHeight = header.offsetHeight;
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}
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},
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_headerHeightChanged: function() {
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if (!this.condensedHeaderHeight) {
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// assume condensedHeaderHeight is 1/3 of the headerHeight
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this.condensedHeaderHeight = this.headerHeight * 1 / 3;
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}
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},
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_condensedHeaderHeightChanged: function() {
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if (this.headerHeight) {
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this._headerMargin = this.headerHeight - this.condensedHeaderHeight;
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}
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},
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_condensesChanged: function() {
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if (this.condenses) {
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this._scroll();
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} else {
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// reset transform/opacity set on the header
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this._condenseHeader(null);
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}
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},
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_setup: function() {
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var s = this.scroller.style;
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s.paddingTop = this.fixed ? '' : this.headerHeight + 'px';
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s.top = this.fixed ? this.headerHeight + 'px' : '';
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if (this.fixed) {
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this._transformHeader(null);
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} else {
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this._scroll();
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}
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},
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_transformHeader: function(y) {
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var s = this.$.headerContainer.style;
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this._translateY(s, -y);
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if (this.condenses) {
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this._condenseHeader(y);
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}
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this.fire('paper-header-transform', {y: y, height: this.headerHeight,
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condensedHeight: this.condensedHeaderHeight});
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},
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_condenseHeader: function(y) {
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var reset = (y === null);
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// adjust top bar in paper-header so the top bar stays at the top
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if (!this.scrollAwayTopbar && this.header.$ && this.header.$.topBar) {
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this._translateY(this.header.$.topBar.style,
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reset ? null : Math.min(y, this._headerMargin));
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}
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// transition header bg
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var hbg = this.$.headerBg.style;
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if (!this.noDissolve) {
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hbg.opacity = reset ? '' : (this._headerMargin - y) / this._headerMargin;
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}
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// adjust header bg so it stays at the center
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this._translateY(hbg, reset ? null : y / 2);
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// transition condensed header bg
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if (!this.noDissolve) {
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var chbg = this.$.condensedHeaderBg.style;
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chbg = this.$.condensedHeaderBg.style;
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chbg.opacity = reset ? '' : y / this._headerMargin;
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// adjust condensed header bg so it stays at the center
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this._translateY(chbg, reset ? null : y / 2);
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}
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},
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_translateY: function(s, y) {
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var t = (y === null) ? '' : 'translate3d(0, ' + y + 'px, 0)';
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setTransform(s, t);
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},
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/** @param {Event=} event */
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_scroll: function(event) {
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if (!this.header) {
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return;
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}
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var sTop = this.scroller.scrollTop;
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this._y = this._y || 0;
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this._prevScrollTop = this._prevScrollTop || 0;
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var y = Math.min(this.keepCondensedHeader ?
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this._headerMargin : this.headerHeight, Math.max(0,
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(this.noReveal ? sTop : this._y + sTop - this._prevScrollTop)));
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if (this.condenses && this._prevScrollTop >= sTop && sTop > this._headerMargin) {
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y = Math.max(y, this._headerMargin);
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}
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if (!event || !this.fixed && y !== this._y) {
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this._transformHeader(y);
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}
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this._prevScrollTop = Math.max(sTop, 0);
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this._y = y;
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if (event) {
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this.fire('content-scroll', {target: this.scroller}, {cancelable: false});
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}
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}
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});
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//determine proper transform mechanizm
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if (document.documentElement.style.transform !== undefined) {
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var setTransform = function(style, string) {
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style.transform = string;
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}
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} else {
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var setTransform = function(style, string) {
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style.webkitTransform = string;
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}
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}
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})();
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</script>
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Reference in New Issue
Block a user