ActionScript3 Cookbook中摘取（六）

1、截获文本超链接事件

TextEvent.LINK

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2、获取用户系统字体

trace(TextField.fontList);

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3、改变可视化对象的颜色

var color:ColorTransform = sampleSprite.transform.colorTransform;
color.rgb = 0xFFFFFF;
sampleSprite.transform.colorTransform = color;

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4、Matrix类（倾斜 缩放）

flash.geom.Matrix类定义了a，b，c，d，tx，和ty属性。b和c决定倾斜度(a和d决定缩放比，tx和ty
决定x和y平移值)。b属性决定Y坐标的倾斜值，c属性决定X坐标的倾斜值，b和c默认为0，值越
大越向下和向右倾斜。

默认值为(a=1, b=0, c=0, d=1, tx=0, ty=0)。

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5、定时器

_timer = new Timer(30);
_timer.addEventListener("timer", onTimer);
_timer.start( );

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6、查找一个字符串中是否包含一个指定的子串

String.indexOf(substr)

循环找出所有子串

while ( ( index = example.indexOf( "cool", index + 1 ) ) != -1 ) {
    trace( "String contains word cool at index " + index );
}

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7、join说明：将"<br>"替换为"\n"，join( )方法重新加入新的分隔符

trace( example.split( "<br>" ).join( '\n' ) );

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8、String的encode和decode

public static function encode( original:String ):String {
	// The codeMap property is assigned to the StringUtilities class when the encode( )
	// method is first run. Therefore, if no codeMap is yet defined, it needs
	// to be created.
	if ( codeMap == null ) {
		// codeMap 属性是一个关联数组用于映射每个原始编码
		codeMap = new Object( );
		// 创建编码为0到255的数组
		var originalMap:Array = new Array( );
		for ( var i:int = 0; i < 256 ; i++ ) {
			originalMap.push( i );
		}
		// 创建一个临时数组用于复制原始编码数组
		var tempChars:Array = originalMap.concat( );
		// 遍历所有原始编码字符
		for ( var i:int = 0; i < originalMap.length; i++ ) {
			var randomIndex:int = Math.floor( Math.random( ) * ( tempChars.length - 1 ) );
			codeMap[ originalMap[i] ] = tempChars[ randomIndex ];
			tempChars.splice( randomIndex, 1 );
		}
	}
	var characters:Array = original.split("");
	for ( i = 0; i < characters.length; i++ ) {
		characters[i] = String.fromCharCode( codeMap[ characters[i].charCodeAt( 0 ) ] );
	}
}

public static function decode( encoded:String ):String {
	var characters:Array = encoded.split( "" );
	if ( reverseCodeMap == null ) {
		reverseCodeMap = new Object( );
		for ( var key in codeMap ) {
			reverseCodesMap[ codeMap[key] ] = key;
		}
	}
	for ( var i:int = 0; i < characters.length; i++ ) {
		characters[i] = String.fromCharCode( reverseCodeMap[ characters[i].charCodeAt( 0 ) ] );
	}
	return characters.join( "" );
}

//调用
var example:String = "Peter Piper picked a peck of pickled peppers.";
var encoded:String = StringUtilities.encode( example );
trace( StringUtilities.decode( encoded ) );

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9、播放声音

//不缓冲

var _sound: Sound = new Sound(new URLRequest("1.mp3"));

_sound.play();

//缓冲 5秒

var request:URLRequest = new URLRequest("1.mp3");
var buffer:SoundLoaderContext = new SoundLoaderContext(5000);
_sound = new Sound( );
_sound.load(request, buffer);
_sound.play( );

//循环播放，第一个参数为起始播放位置

_sound.play(0, int.MAX_VALUE);

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10、声音载入进度条

package {
	import flash.display.Sprite;
	import flash.media.Sound;
	import flash.net.URLRequest;
	import flash.events.Event;
	public class ProgressBar extends Sprite {
		public function ProgressBar( ) {
			addEventListener(Event.ENTER_FRAME, onEnterFrame);
			_sound = new Sound(new URLRequest("song.mp3"));
			_sound.play( );
		}
		public function onEnterFrame(event:Event):void
		{
			var barWidth:int = 200;
			var barHeight:int = 5;
			var loaded:int = _sound.bytesLoaded;
			var total:int = _sound.bytesTotal;
			if(total > 0) {
				// Draw a background bar
				graphics.clear( );
				graphics.beginFill(0xFFFFFF);
				graphics.drawRect(10, 10, barWidth, barHeight);
				graphics.endFill( );
				// The percent of the sound that has loaded
				var percent:Number = loaded / total;
				// Draw a bar that represents the percent of
				// the sound that has loaded
				graphics.beginFill(0xCCCCCC);
				graphics.drawRect(10, 10,
				barWidth * percent, barHeight);
				graphics.endFill( );
			}
		}
	}
}

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11、声间的播放/暂停

package {
	import flash.display.Sprite;
	import flash.media.Sound;
	import flash.media.SoundChannel;
	import flash.net.URLRequest;
	import flash.events.Event;
	import flash.display.Sprite;
	import flash.events.MouseEvent;
	public class PlayPause extends Sprite {
		private var _sound:Sound;
		private var _channel:SoundChannel;
		private var _playPauseButton:Sprite;
		private var _playing:Boolean = false;
		private var _position:int;
		public function PlayPause( ) {
			// Create sound and start it
			_sound = new Sound(new URLRequest("song.mp3"));
			_channel = _sound.play( );
			_playing = true;
			// A sprite to use as a Play/Pause button
			_playPauseButton = new Sprite( );
			addChild(_playPauseButton);
			_playPauseButton.x = 10;
			_playPauseButton.y = 20;
			_playPauseButton.graphics.beginFill(0xcccccc);
			_playPauseButton.graphics.drawRect(0, 0, 20, 20);
			_playPauseButton.addEventListener(MouseEvent.MOUSE_UP,
			onPlayPause);
		}
		public function onPlayPause(event:MouseEvent):void {
			// If playing, stop. Take note of position
			if(_playing) {
				_position = _channel.position;
				_channel.stop( );
			}
			else {
				// If not playing, re-start it at
				// last known position
				_channel = _sound.play(_position);
			}
			_playing = !_playing;
		}
	}
}