37 lines
734 B
JavaScript
37 lines
734 B
JavaScript
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/* jshint esnext: true */
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import { $document, $window, $html, $body } from '../utils/environment';
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const CALLBACKS = {
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hidden: [],
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visible: []
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};
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// Main event
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$document.on('visibilitychange', function(event) {
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if(document.hidden){
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onDocumentChange('hidden');
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}else{
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onDocumentChange('visible');
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}
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});
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function registerDocumentHiddenCallback(callback) {
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CALLBACKS['hidden'].push(callback);
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}
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function registerDocumentVisibleCallback(callback) {
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CALLBACKS['visible'].push(callback);
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}
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function onDocumentChange(state) {
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let callbacks = CALLBACKS[state];
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let i = 0;
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let len = callbacks.length;
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for (; i < len; i++) {
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callbacks[i]();
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}
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}
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export {registerDocumentHiddenCallback, registerDocumentVisibleCallback};
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