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function clickHandler(evt:MouseEvent):void { if (channel != null) { if (btnPlay.currentLabel == "play") { channel = song.play(pos); btnPlay.gotoAndStop("pause"); } else { pos = channel.position; channel.stop(); btnPlay.gotoAndStop("play"); } } }; It s worth noting that some of this code overlaps. (Don t worry if you didn t see it! That s a lot of ActionScript to pore through.) In the ComboBox block, for example, inside the changeHandler() function, notice that these two lines: channel = song.play(); btnPlay.gotoAndStop("pause"); match these two lines in the Buttons block s clickHandler() function (relevant code in bold): if (btnPlay.currentLabel == "play") { channel = song.play(pos); btnPlay.gotoAndStop("pause"); } else { In simple projects, you don t need to lose any sleep over the occasional overlap. But it s definitely something you want to keep in mind. We ve looked at some optimization already in this chapter (the preloader exercise), and there s more of that coming in 15. The concept of optimization applies as much to the structure of your ActionScript as it does to your assets. As we wire up the controls, you ll find that numerous event handlers are going to load, pause, or play a song, so it makes good sense to write custom functions to perform those actions. Then those functions can be reused by your various event handlers. Doing this makes your ActionScript easier to read and, ultimately, there s less of it to type. The result is code that is easier to deal with. We ll now make the revisions to get rid of the overlap. Add the following new variables to the code inside your Variables block near the top (new code in bold): //////////////////////////////////////// // Variables //////////////////////////////////////// var var var var var var var song:Sound; channel:SoundChannel; xform:SoundTransform; req:URLRequest; pos:Number; currentSong:int; rect:Rectangle;

Like the existing variables, the three new ones are declared but not yet set to anything The xform variable will be a SoundTransform instance for controlling audio volume currentSong is just like the currentImage variable in the Beijing slide show (here, it s used to keep track of the currently playing song) rect will be a Rectangle instance, which is used later to control the draggable distance of the seek and volume slider knobs Skip down to the ComboBox block Within the changeHandler() function, change what you see so that it looks like this (revision in bold): function changeHandler(evt:Event):void { if (songsCBselectedItemdata != "") { currentSong = songsCBselectedIndex; loadSong(songsCBselectedItemdata); } }; This trims up the function quite a bit.

abs() acos() asin() atan() atan2() cos() cosh() exp() floor() fmod() hypot() int() log() pow() sin() sinh() sqrt() tan() tanh()

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Instead of dealing with the loading code here URLRequest, checking if the channel instance is null, and so on those lines have been moved to a set of new functions you re about to write These new functions will fit between the ComboBox block and the Buttons block Copy one of those code block commented headings and paste it after the changeHandler() function Change its caption to Song Functions, like this: //////////////////////////////////////// // Song Functions //////////////////////////////////////// After this commented heading, type the following new function: function loadSong(file:String):void { req = new URLRequest(file); pauseSong(); song = new Sound(req); songaddEventListener(EventOPEN, soundOpenHandler); songaddEventListener(EventCOMPLETE, soundCompleteHandler); songaddEventListener(EventID3, soundID3Handler); playSong(); }; This is an example of double-dipping, as far as code optimization is concerned You might even call it passing the buck.

For this first example, consider the following scenario: You have a data-driven web page that needs to continuously alert the user with fast changing data, for instance, a page that displays the major financial indices in the U.S. capital markets: Dow Jones Industrial Average (DJIA), NASDAQ, and S&P500. One approach is to place a <META> tag in your page with refresh values that then force the page to refresh itself in regular intervals based on the provided value. But if you wanted to make the page behave more like a desktop application and update the data without page refresh, AJAX is definitely the recommended path. By now, you have seen the basics of the ScriptManager, UpdatePanel, UpdateProgress, and the Timer server controls in ASP.NET AJAX and have a good understanding of their functionality. So, with that in mind, let s build a quick application that does exactly what was talked about earlier: displays the three main indices of the American capital markets and continues to update the page with (simulated) real-time data without any page refresh.

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