A tour of the Beijing art district in Font

Creation QR Code in Font A tour of the Beijing art district

A tour of the Beijing art district
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To start, we re going to walk you through a self-contained, hardwired movie that displays a small collection of external JPEGs and their captions. The number of JPEGs and the order in which they appear are baked in to the SWF, which means the movie must be edited and republished to accommodate new images. This slide show features ComboBox and Button components to let people choose which JPEGs they want to see, and it even uses the UILoader and ProgressBar components to load the images, so this will be something of a cumulative exercise. Once the test model is complete, we ll free the photo-specific data from its dungeon and move it to an XML file, where it can leap free in the fields like a shorn sheep or paddle merrily around a pond like a duck. Here we go!
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1. Start a new Flash document, and save it as Slideshow.fla in this chapter s Exercise/Slideshow folder. Set the movie s dimensions to 320 480. Set the background
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color to whatever you like (we chose #336699).
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2. Create the following five layers: scripts, progress bar, loader, caption, and nav. Lock
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the scripts layer to avoid accidentally placing content in this layer.
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3. Open the Components panel (Window Components or click the Components button on the
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toolbar), and drag an instance of the ProgressBar component to the progress bar layer. Use the Properties panel to ensure its width is 150 and to set the height to 22, X position to 85, and Y position to 200. Give it the instance name pb.
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4. Drag an instance of the UILoader component to the loader layer. Set its width to 300, height
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to 400, X position to 10, and Y position to 10. Give it the instance name loader.
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5. Captions will be displayed with a text field. Use the Text tool to create a TLF Text
Selectable text container in the caption layer. Set its width to 300, height to 28, X position to 10, and Y position to 416. Give this text field the instance name caption. Make the font _sans, 18pt, and white so that it shows over the blue background. We will leave the decision to embed the font up to you.
6. Drag an instance of the ComboBox component to the nav layer. Set its width to 220, X position to
10, and Y position to 450. Give it the instance name images.
7. Drag an instance of the Button component to the nav layer. Set its width to 70, X position 240,
and Y position to 450. Give it the instance name next.
8. In the Component Parameters area of the Properties panel, set the button s Label
parameter to Next. At this point, you have something like the scaffolding shown in Figure 14-6.
BUILDING STUFF
Figure 14-6. The parts are in place; time for the ActionScript. Now it s time to bring these parts to life. For the most part, it s a matter of handling events for the components and populating the combo box.
9. Click into frame 1 of the scripts layer, and open the Actions panel. Here s the first chunk of
code: import fl.data.DataProvider; var imageData:Array = new Array( {label:"798 Art District Photo 1", data:"798_01.jpg", caption:"Lazy day on the street."},
{label:"798 Art District Photo 2", data:"798_02.jpg", caption:"Wall art."}, {label:"798 Art District Photo 3", data:"798_03.jpg", caption:"Angry and cute."}, {label:"798 Art District Photo 4", data:"798_04.jpg", caption:"The modern and the ancient!"}, {label:"798 Art District Photo 5", data:"798_05.jpg", caption:"Not sure what to make of this."}, {label:"798 Art District Photo 6", data:"798_06.jpg", caption:"The power of the artist "}, {label:"798 Art District Photo 7", data:"798_07.jpg", caption:"Fashion shoot at a steam engine."}, {label:"798 Art District Photo 8", data:"798_08.jpg", caption:"A street in the district."} ); The first line imports the DataProvider class, which is needed later when it s time to populate the combo box. After that, an arbitrarily named variable, imageData, is set to an instance of the Array class. Arrays are lists of whatever you put in them. You can use the Array.push() method on an instance to add elements to that instance, but you can also pass in the whole collection at once, which we ve done here. This array has eight items, separated by commas, and each item is an instance of the generic Object class with three properties: caption, label, and data. What, no new Object() statement How are these objects being created That s what the curly braces ({}) are for. It s a shortcut, and we re taking it. You ll remember from 11 that ComboBox instances can be supplied with label and data information, so that explains what those properties are in the array. The caption property is a custom addition.
10. Press Enter (Windows) or Return (Mac) a couple times, and type in the following:
var currentImage:int = 0; var req:URLRequest = new URLRequest(); function changePicture(pict:int):void { pb.visible = true; caption.text = imageData[pict].caption; req.url = imageData[pict].data; loader.load(req); } changePicture(0); The first line declares an integer variable, currentImage, and sets it to 0. This number will keep track of which image is being viewed. Next, a req variable holds an instance of the URLRequest class, which will be used to request the current image file. The next several lines declare a custom function, changePicture(), which accepts a single parameter, pict. This function does the following three things:
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