mirror of
https://github.com/hiloteam/Hilo.git
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69 lines
1.7 KiB
JavaScript
69 lines
1.7 KiB
JavaScript
/**
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* hilojs 2.0.3 for cmd
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* Copyright 2016 alibaba.com
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* Licensed under the MIT License
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*/
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define(function(require, exports, module){
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var Drawable = require('hilo/view/Drawable');
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var browser = require('hilo/util/browser');
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var _cacheCanvas, _cacheContext;
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/**
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* @language=en
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* @class CacheMixin A mixin that contains cache method.You can mix cache method to the target by use Class.mix(target, CacheMixin).
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* @static
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* @mixin
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* @module hilo/view/CacheMixin
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* @requires hilo/view/Drawable
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* @requires hilo/util/browser
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*/
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var CacheMixin = /** @lends CacheMixin# */ {
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_cacheDirty:true,
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/**
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* @language=en
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* Cache the view.
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* @param {Boolean} forceUpdate is force update cache.
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*/
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cache: function(forceUpdate){
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if(forceUpdate || this._cacheDirty || !this.drawable){
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this.updateCache();
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}
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},
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/**
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* @language=en
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* Update the cache.
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*/
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updateCache:function(){
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if(browser.supportCanvas){
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if(!_cacheCanvas){
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_cacheCanvas = document.createElement('canvas');
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_cacheContext = _cacheCanvas.getContext('2d');
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}
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//TODO:width, height自动判断
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_cacheCanvas.width = this.width;
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_cacheCanvas.height = this.height;
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this._draw(_cacheContext);
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this.drawable = this.drawable||new Drawable();
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this.drawable.init({
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image:_cacheCanvas.toDataURL()
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});
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this._cacheDirty = false;
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}
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},
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/**
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* @language=en
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* set the cache state diry.
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* @param {Boolean} dirty is cache dirty
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*/
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setCacheDirty:function(dirty){
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this._cacheDirty = dirty;
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}
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};
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return CacheMixin;
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}); |