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/* |
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Copyright (c) 2007, Andreas Blixt, http://blixt.org/. All rights reserved. |
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Code licensed under the MIT License: |
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http://www.opensource.org/licenses/mit-license.php |
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*/ |
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// waitTime is in milliseconds. |
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var ScreenSaver = function (waitTime) { |
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this.lastActivity = new Date().getTime(); |
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this.waitTime = waitTime; |
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var $this = this; |
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this._timer = setInterval(function () { $this._checkTime.call($this) }, 1000); |
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document.onmousemove = function () { $this._mouseHandler.call($this) }; |
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}; |
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ScreenSaver.prototype = { |
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_timer: null, |
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lastActivity: 0, |
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started: false, |
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waitTime: 0, |
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onstart: function () {}, |
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onend: function () {}, |
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dispose: function () { |
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if (this._timer) clearInterval(this._timer); |
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document.onmousemove = null; |
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}, |
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_checkTime: function () { |
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if (!this.started && new Date().getTime() - this.lastActivity >= this.waitTime) { |
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this.started = true; |
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this.onstart(); |
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} |
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}, |
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_mouseHandler: function () { |
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this.lastActivity = new Date().getTime(); |
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if (this.started) { |
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this.started = false; |
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this.onend(); |
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} |
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} |
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}; |
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/*********** Begin Example *********** |
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var ss = new ScreenSaver(5000); |
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ss.onstart = function () { |
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document.getElementsByTagName("body")[0].style.backgroundColor = "#000"; |
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}; |
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ss.onend = function () { |
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document.getElementsByTagName("body")[0].style.backgroundColor = "#fff"; |
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}; |
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************* End Example *************/ |