Part IV: Event-Driven Programming in Java

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Part IV: Event-Driven Programming
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In the example, you useds three properties of the Timer class:
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currentCount The number of times the timer has red since it was started. If you use the reset() command, this number is reset to 0. This is a read-only property, so it can t be changed directly. repeatCount The number of times the timer event will be red. The default value, zero,
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causes the timer to re inde nitely until the timer is stopped or the program ends. This is the same value that is de ned when you create the timer instance. repeatCount is a read/write property, so it can be changed on the y.
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delay The number of milliseconds between each ring of the timer event. This is the same value that is de ned when you create the timer instance. delay is a read/write property, so it can be changed on the y.
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Delaying the Execution of a Function
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Timers make it easy to delay the execution of a function. Simply set up a timer that res only once, and set the delay for the time you d like to wait before ring. A common application for this is creating a timeout, a predetermined time allotted for an action to take place, such as a server response, after which the action is aborted. In Example 22-5, you ll use a timer to create something you re no doubt familiar with from browsing the internet, a redirect script. First you ll create the Redirect class, which will handle the timer and navigation. Then you ll set up an example class to test it.
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EXAMPLE 22-5
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Delaying a Function s Execution
package { import com.actionscriptbible.Example; import flash.text.*; public class ch22ex5 extends Example { protected const redirectURL:String = "http://www.wonderfl.net"; protected const redirectDelay:Number = 5 * 1000; public function ch22ex5() { var redirect:Redirect = new Redirect(redirectURL, redirectDelay); trace("This page no longer exists. You will be redirected to\n" + redirectURL + " after " + redirectDelay/1000 + " seconds."); } } } import flash.utils.Timer; import flash.events.*; import flash.net.*; class Redirect { private var redirectTimer:Timer; private var redirectURL:URLRequest; private static const REDIRECT_DELAY:int = 5000;
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22: Timers and Time-Driven Programming
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public function Redirect(url:String, delay:Number=REDIRECT_DELAY) { redirectURL = new URLRequest(url); redirectTimer = new Timer(delay, 1); redirectTimer.addEventListener(TimerEvent.TIMER,onRedirect); redirectTimer.start(); } private function onRedirect(event:Event):void { navigateToURL(redirectURL, "_self"); } }
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The result should be a page with the redirect message that navigates away after 5 seconds. You ll have to run this one on your own computer, because the security policy where the example is hosted won t let you navigate away.
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You can create a simple timeout with the function flash.utils.setTimeout(), covered in the section Other Time Related Functions.
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Let s try a quick and easy example that uses the Timer class s ability to send timing events to multiple recipients. Example 22-6 shows a simple world clock that shows the time in multiple time zones. This leverages what you learned about time zones and the Date class in 7, Numbers, Math, and Dates. EXAMPLE 22-6
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A World Clock
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package { import flash.display.Sprite; import flash.utils.Timer; public class ch22ex6 extends Sprite { public function ch22ex6() { var timer:Timer = new Timer(1000); var nyc:LocalClock = new LocalClock(timer, "New York City, USA", -5); var paris:LocalClock = new LocalClock(timer, "Paris, France", 1); var tokyo:LocalClock = new LocalClock(timer, "Tokyo, Japan", 10); addChild(nyc); nyc.x = 0; addChild(paris);
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continued
Part IV: Event-Driven Programming
EXAMPLE 22-6
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paris.y = 50; addChild(tokyo); tokyo.y = 100; timer.start(); } } } import flash.utils.Timer; import flash.events.*; import flash.display.Sprite; import flash.text.*; class LocalClock extends Sprite { private var location:String; private var timezoneOffset:int; private var labelTF:TextField; private var clockTF:TextField; public function LocalClock(timer:Timer, location:String, tzOffset:int) { this.location = location; this.timezoneOffset = tzOffset; labelTF = new TextField(); clockTF = new TextField(); labelTF.autoSize = clockTF.autoSize = TextFieldAutoSize.LEFT; labelTF.width = labelTF.height = clockTF.width = clockTF.height = 0; labelTF.selectable = clockTF.selectable = false; labelTF.defaultTextFormat = new TextFormat("_serif", 12, 0, false, true); clockTF.defaultTextFormat = new TextFormat("_typewriter", 12, 0x6AF685); clockTF.background = true; clockTF.backgroundColor = 0x000000; labelTF.text = location; clockTF.y = labelTF.textHeight + 5; addChild(labelTF); addChild(clockTF); timer.addEventListener(TimerEvent.TIMER, onTimer); } private function onTimer(event:TimerEvent = null):void { var date:Date = new Date(); date.hoursUTC += timezoneOffset; clockTF.text = pad(date.hoursUTC) + ":" + pad(date.minutesUTC) + ":" + pad(date.secondsUTC); } private function pad(n:Number):String { var s:String = n.toString(); while (s.length < 2) s = "0" + s; return s; } }