mirror of
https://github.com/hiloteam/Hilo.git
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49 lines
1.4 KiB
JavaScript
49 lines
1.4 KiB
JavaScript
/**
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* Hilo
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* Copyright 2015 alibaba.com
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* Licensed under the MIT License
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*/
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var _cacheCanvas = Hilo.createElement('canvas');
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var _cacheContext = _cacheCanvas.getContext('2d');
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/**
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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/core/Hilo
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* @requires hilo/view/Drawable
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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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* 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._cacheImage){
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this.updateCache();
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}
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},
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/**
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* Update the cache.
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*/
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updateCache:function(){
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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._cacheImage = new Image();
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this._cacheImage.src = _cacheCanvas.toDataURL();
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this.drawable = this.drawable||new Drawable();
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this.drawable.init(this._cacheImage);
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this._cacheDirty = false;
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},
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/**
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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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}; |