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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| // @depends PxLoader.js | ||
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| /** | ||
| * PxLoader plugin to load video elements | ||
| */ | ||
| function PxLoaderVideo(url, tags, priority) { | ||
| var self = this; | ||
| var loader = null; | ||
|
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| try { | ||
| this.vid = new Video(); | ||
| } catch(e) { | ||
| this.vid = document.createElement('video'); | ||
| } | ||
|
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| this.tags = tags; | ||
| this.priority = priority; | ||
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| var onReadyStateChange = function () { | ||
| if (self.vid.readyState != 4) { | ||
| return; | ||
| } | ||
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| removeEventHandlers(); | ||
| loader.onLoad(self); | ||
| }; | ||
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| var onLoad = function() { | ||
| removeEventHandlers(); | ||
| loader.onLoad(self); | ||
| }; | ||
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| var onError = function() { | ||
| removeEventHandlers(); | ||
| loader.onError(self); | ||
| }; | ||
|
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| var removeEventHandlers = function() { | ||
| self.unbind('load', onLoad); | ||
| self.unbind('canplaythrough', onReadyStateChange); | ||
| self.unbind('error', onError); | ||
| }; | ||
|
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| this.start = function(pxLoader) { | ||
| // we need the loader ref so we can notify upon completion | ||
| loader = pxLoader; | ||
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| // NOTE: Must add event listeners before the src is set. We | ||
| // also need to use the readystatechange because sometimes | ||
| // load doesn't fire when an video is in the cache. | ||
| self.bind('load', onLoad); | ||
| self.bind('canplaythrough', onReadyStateChange); | ||
| self.bind('error', onError); | ||
|
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| self.vid.src = url; | ||
| }; | ||
|
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| // called by PxLoader to check status of video (fallback in case | ||
| // the event listeners are not triggered). | ||
| this.checkStatus = function() { | ||
| if (self.vid.readyState != 4) { | ||
| return; | ||
| } | ||
|
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| removeEventHandlers(); | ||
| loader.onLoad(self); | ||
| }; | ||
|
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| // called by PxLoader when it is no longer waiting | ||
| this.onTimeout = function() { | ||
| removeEventHandlers(); | ||
| if (self.vid.readyState != 4) { | ||
| loader.onLoad(self); | ||
| } else { | ||
| loader.onTimeout(self); | ||
| } | ||
| }; | ||
|
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| // returns a name for the resource that can be used in logging | ||
| this.getName = function() { | ||
| return url; | ||
| }; | ||
|
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| // cross-browser event binding | ||
| this.bind = function(eventName, eventHandler) { | ||
| if (self.vid.addEventListener) { | ||
| self.vid.addEventListener(eventName, eventHandler, false); | ||
| } else if (self.vid.attachEvent) { | ||
| self.vid.attachEvent('on'+eventName, eventHandler); | ||
| } | ||
| }; | ||
|
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| // cross-browser event un-binding | ||
| this.unbind = function(eventName, eventHandler) { | ||
| if (self.vid.removeEventListener) { | ||
| self.vid.removeEventListener(eventName, eventHandler, false); | ||
| } else if (self.vid.detachEvent) { | ||
| self.vid.detachEvent('on'+eventName, eventHandler); | ||
| } | ||
| }; | ||
|
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| } | ||
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| // add a convenience method to PxLoader for adding an image | ||
| PxLoader.prototype.addVideo = function(url, tags, priority) { | ||
| var videoLoader = new PxLoaderVideo(url, tags, priority); | ||
| this.add(videoLoader); | ||
|
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| // return the vid element to the caller | ||
| return videoLoader.vid; | ||
| }; |
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