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Figure 14-7. A few quick components and a bit of ActionScript, and you re off!
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As it turns out, wandering through the 798 Art District of Beijing makes for a decent metaphor for this exercise, because after all of this careful examination of the art in the galleries, we re about to uncover a treasure in a gallery just a few more paces up the street. Save your file to keep everything safe. Now select File Save As, and save a copy as SlideshowXML.fla into the same folder. Click back into frame 1 of the scripts layer to make a few changes. Here s the first chunk of code, which replaces the Array, with revisions shown in bold. import fl.data.DataProvider; var xmlDoc:XML = new XML(); var xmlLoader:URLLoader = new URLLoader(); var xmlReq:URLRequest = new URLRequest("slideshow.xml"); xmlLoader.load(xmlReq); xmlLoader.addEventListener(Event.COMPLETE, xmlCompleteHandler); function xmlCompleteHandler (evt:Event):void { xmlDoc = XML(evt.target.data); images.dataProvider = new DataProvider(xmlDoc); changePicture(0); };
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The imageData array is gone completely. In its place stands the familiar XML loading formula. The only differences here are the variable names. The URLLoader instance, for example, has been changed to xmlLoader, because loader is already in use as the instance name for the UILoader component. In the same way, the URLRequest instance is named xmlReq, because req is used later in the code, and the XML s completeHandler() function is named xmlCompleteHandler(). This time, we re loading the file slideshow.xml, and that s where the former imageData content now resides. If you open the XML file, you will see not much has changed. It is practically the same as the previous array, except that this time, it s in a separate XML document instead of being hardwired into the ActionScript. Let s take another look at the Event.COMPLETE event handler for the xmlLoader instance. The function runs as follows: function xmlCompleteHandler(evt:Event):void { xmlDoc = XML(evt.target.data); images.dataProvider = new DataProvider(xmlDoc); changePicture(0); }; Notice that the DataProvider handling has been moved here from its former position next to the combo box Event.CHANGE handler. Why Because under the circumstances, the combo box can t be populated until the XML has loaded. Next, the changePicture() call has also been moved here from its earlier position. Why Same reason: until the XML loads, the changePicture() has no reference for what image to summon. Two more paces! At or near line 21, you ll find the changeFunction() declaration. You ll need to tweak two lines (changes in bold): function changePicture(pict:int):void { pb.visible = true; caption.text = xmlDoc.slide[pict].@caption; req.url = xmlDoc.slide[pict].@data; loader.load(req); }; Instead of pulling from the old imageData array, the text field and UILoader component now draw their information from the xml instance, using E4X syntax to specify the relevant <slide> element attributes found in the XML file. Here, the function s incoming pict parameter serves the same purpose as it did before: it specifies which <slide> element to consult. Don t forget to delete what used to be the last line in this chunk: that is, changePicture(0);, which is now called inside the xmlCompleteHandler() function. It s easy to miss!
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Here are the last touch-ups. There s a reward in sight! First, delete the following data provider line (which has been moved to the xmlCompleteHandler() function): images.dataProvider = new DataProvider(imageData); Finally, revise one reference in the button s event handler (new code in bold): function clickHandler(evt:MouseEvent):void { currentImage++; if (currentImage == xmlDoc.slide.length()) { currentImage = 0; } images.selectedIndex = currentImage; changePicture(currentImage); }; Since imageData is no more, that line depends on the number of <slide> elements, instead. Test the movie and watch the show again. If you think you missed a step, compare your work to the
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