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78 lines
1.9 KiB
HTML
78 lines
1.9 KiB
HTML
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<!--
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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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<!--
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`iron-media-query` can be used to data bind to a CSS media query.
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The `query` property is a bare CSS media query.
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The `query-matches` property is a boolean representing whether the page matches that media query.
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Example:
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<iron-media-query query="(min-width: 600px)" query-matches="{{queryMatches}}"></iron-media-query>
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@group Iron Elements
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@demo demo/index.html
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@hero hero.svg
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@element iron-media-query
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-->
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<script>
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Polymer({
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is: 'iron-media-query',
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properties: {
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/**
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* The Boolean return value of the media query.
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*/
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queryMatches: {
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type: Boolean,
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value: false,
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readOnly: true,
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notify: true
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},
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/**
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* The CSS media query to evaluate.
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*/
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query: {
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type: String,
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observer: 'queryChanged'
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}
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},
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created: function() {
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this._mqHandler = this.queryHandler.bind(this);
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},
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queryChanged: function(query) {
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if (this._mq) {
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this._mq.removeListener(this._mqHandler);
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}
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if (query[0] !== '(') {
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query = '(' + query + ')';
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}
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this._mq = window.matchMedia(query);
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this._mq.addListener(this._mqHandler);
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this.queryHandler(this._mq);
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},
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queryHandler: function(mq) {
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this._setQueryMatches(mq.matches);
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}
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});
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</script>
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