mirror of
https://github.com/photonstorm/phaser
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85 lines
2.1 KiB
JavaScript
85 lines
2.1 KiB
JavaScript
/**
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* @author Richard Davey <rich@phaser.io>
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* @copyright 2013-2024 Phaser Studio Inc.
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* @license {@link https://opensource.org/licenses/MIT|MIT License}
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*/
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var Events = require('./events');
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/**
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* The Visibility Handler is responsible for listening out for document level visibility change events.
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* This includes `visibilitychange` if the browser supports it, and blur and focus events. It then uses
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* the provided Event Emitter and fires the related events.
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*
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* @function Phaser.Core.VisibilityHandler
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* @fires Phaser.Core.Events#BLUR
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* @fires Phaser.Core.Events#FOCUS
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* @fires Phaser.Core.Events#HIDDEN
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* @fires Phaser.Core.Events#VISIBLE
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* @since 3.0.0
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*
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* @param {Phaser.Game} game - The Game instance this Visibility Handler is working on.
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*/
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var VisibilityHandler = function (game)
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{
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var hiddenVar;
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var eventEmitter = game.events;
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if (document.hidden !== undefined)
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{
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hiddenVar = 'visibilitychange';
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}
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else
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{
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var vendors = [ 'webkit', 'moz', 'ms' ];
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vendors.forEach(function (prefix)
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{
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if (document[prefix + 'Hidden'] !== undefined)
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{
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document.hidden = function ()
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{
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return document[prefix + 'Hidden'];
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};
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hiddenVar = prefix + 'visibilitychange';
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}
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});
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}
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var onChange = function (event)
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{
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if (document.hidden || event.type === 'pause')
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{
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eventEmitter.emit(Events.HIDDEN);
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}
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else
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{
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eventEmitter.emit(Events.VISIBLE);
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}
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};
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if (hiddenVar)
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{
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document.addEventListener(hiddenVar, onChange, false);
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}
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window.onblur = function ()
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{
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eventEmitter.emit(Events.BLUR);
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};
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window.onfocus = function ()
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{
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eventEmitter.emit(Events.FOCUS);
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};
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// Automatically give the window focus unless config says otherwise
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if (window.focus && game.config.autoFocus)
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{
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window.focus();
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}
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};
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module.exports = VisibilityHandler;
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