90 lines
2.9 KiB
JavaScript
90 lines
2.9 KiB
JavaScript
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/* ***** BEGIN LICENSE BLOCK *****
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* Distributed under the BSD license:
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*
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* Copyright (c) 2010, Ajax.org B.V.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Ajax.org B.V. nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL AJAX.ORG B.V. BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ***** END LICENSE BLOCK ***** */
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define(function(require, exports, module) {
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"use strict";
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var event = require("./lib/event");
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/**
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*
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*
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* Batches changes (that force something to be redrawn) in the background.
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* @class RenderLoop
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**/
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var RenderLoop = function(onRender, win) {
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this.onRender = onRender;
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this.pending = false;
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this.changes = 0;
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this.$recursionLimit = 2;
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this.window = win || window;
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var _self = this;
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this._flush = function(ts) {
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_self.pending = false;
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var changes = _self.changes;
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if (changes) {
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event.blockIdle(100);
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_self.changes = 0;
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_self.onRender(changes);
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}
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if (_self.changes) {
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if (_self.$recursionLimit-- < 0) return;
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_self.schedule();
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} else {
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_self.$recursionLimit = 2;
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}
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};
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};
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(function() {
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this.schedule = function(change) {
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this.changes = this.changes | change;
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if (this.changes && !this.pending) {
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event.nextFrame(this._flush);
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this.pending = true;
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}
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};
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this.clear = function(change) {
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var changes = this.changes;
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this.changes = 0;
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return changes;
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};
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}).call(RenderLoop.prototype);
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exports.RenderLoop = RenderLoop;
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});
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