FLASH-FLEX3.0开发教程中文版(例子源码）

==== Code from: ActionScript 3.0 Cookbook: ID-I_0596526954_CHP_15_SECT_16_1.txt ===== package { import flash.display.Sprite; import flash.display.Stage; import flash.display.StageAlign; import flash.display.StageScaleMode; import flash.text.TextField; import flash.events.Event; import flash.events.MouseEvent; import flash.events.TimerEvent; import flash.media.Sound; import flash.media.SoundChannel; import flash.media.SoundTransform; import flash.net.URLRequest; import flash.text.TextFormat; import flash.utils.Timer; public class CookBookPlayer extends Sprite { private var _channel:SoundChannel; private var _displayText:TextField; private var _sound:Sound; private var _panControl:PanControl; private var _playing:Boolean = false; private var _playPauseButton:Sprite; private var _position:int = 0; private var _spectrumGraph:SpectrumGraph; private var _volumeControl:VolumeControl; public function CookBookPlayer(()) { // Stage alignment stage.scaleMode = flash.display.StageScaleMode.NO_SCALE; stage.align = flash.display.StageAlign.TOP_LEFT; // Enter frame listener var timer:Timer = new Timer(20); timer.addEventListener(TimerEvent.TIMER, onTimer); timer.start(()); _playing = true; // Display a text field _displayText = new TextField(()); addChild(_displayText); _displayText.x = 10; _displayText.y = 17; _displayText.width = 256; _displayText.height = 14; // Create a sound object _sound = new Sound(new URLRequest(""http://www.rightactionscript.com samplefiles/sample.mp3"")); _sound.addEventListener(Event.ID3, onID3); _channel = _sound.play(()); // Create a bitmap for spectrum display _spectrumGraph = new SpectrumGraph(()); _spectrumGraph.x = 10; _spectrumGraph.y = 33; addChild(_spectrumGraph); // Create the Play and Pause buttons _playPauseButton = new PlayButton(()); _playPauseButton.x = 10; _playPauseButton.y = 68; addChild(_playPauseButton); _playPauseButton.addEventListener(MouseEvent.MOUSE_UP, onPlayPause); // Create volume and pan controls _volumeControl = new VolumeControl(()); _volumeControl.x = 45; _volumeControl.y = 68; addChild(_volumeControl); _volumeControl.addEventListener(Event.CHANGE, onTransform); _panControl = new PanControl(()); _panControl.x = 164; _panControl.y = 68; addChild(_panControl); _panControl.addEventListener(Event.CHANGE, onTransform); } public function onTransform(event:Event):void { // Get volume and pan data from controls // and apply to a new SoundTransform object _channel.soundTransform = new SoundTransform( _volumeControl.volume, _panControl.pan); } public function onPlayPause(event:MouseEvent):void { // If playing, stop and record that position if(_playing) { _position = _channel.position; _channel.stop(()); } else { // Else, restart at the saved position _channel = _sound.play(_position); } _playing = !_playing; } public function onID3(event:Event):void { // Display selected id3 tags in the text field _displayText.text = _sound.id3.artist + " : " + _sound.id3.songName; _displayText.setTextFormat( new TextFormat("_typewriter", 8, 0)); } public function onTimer(event:TimerEvent):void { var barWidth:int = 256; var barHeight:int = 5; var loaded:int = _sound.bytesLoaded; var total:int = _sound.bytesTotal; var length:int = _sound.length; var position:int = _channel.position; // Draw a background bar graphics.clear(()); graphics.beginFill(0xFFFFFF); graphics.drawRect(10, 10, barWidth, barHeight); graphics.endFill(()); if(total > 0) { // The percent of the sound that has loaded var percentBuffered:Number = loaded / total; // Draw a bar that represents the percent of // the sound that has loaded graphics.beginFill(0xCCCCCC); graphics.drawRect(10, 10, barWidth * percentBuffered, barHeight); graphics.endFill(()); // Correct the sound length calculation length /= percentBuffered; // The percent of the sound that has played var percentPlayed:Number = position / length; // Draw a bar that represents the percent of // the sound that has played graphics.beginFill(0x666666); graphics.drawRect(10, 10, barWidth * percentPlayed, barHeight); graphics.endFill(()); _spectrumGraph.update(()); } } } } // "helper classes" // (This is an outside package, but it's available to classes // in the same file) import flash.display.Bitmap; import flash.display.BitmapData; import flash.display.Sprite; import flash.events.Event; import flash.events.MouseEvent; import flash.filters.DropShadowFilter; import flash.geom.Rectangle; import flash.media.SoundMixer; import flash.utils.ByteArray; class PlayButton extends Sprite { public function PlayButton(()) { // Draw the Play/Pause graphic graphics.beginFill(0xcccccc); graphics.drawRoundRect(0, 0, 20, 16, 4, 4); graphics.endFill(()); graphics.beginFill(0x333333); graphics.moveTo(4, 4); graphics.lineTo(8, 8); graphics.lineTo(4, 12); graphics.lineTo(4, 4); graphics.drawRect(10, 4, 2, 8); graphics.drawRect(14, 4, 2, 8); graphics.endFill(()); } } class SpectrumGraph extends Sprite { private var _spectrumBMP:BitmapData; public function SpectrumGraph(()) { // Bitmap to draw spectrum data in _spectrumBMP = new BitmapData(256, 30, true, 0x00000000); var bitmap:Bitmap = new Bitmap(_spectrumBMP); bitmap.filters = [new DropShadowFilter(3, 45, 0, 1, 3, 2, .3, 3)]; addChild(bitmap); } public function update(()):void { // Get spectrum data var spectrum:ByteArray = new ByteArray(()); SoundMixer.computeSpectrum(spectrum); // Draw to bitmap _spectrumBMP.fillRect(_spectrumBMP.rect, 0xff6666