如何使用键盘输入更改声音的音量？ [英] How to change the volume of a Sound using keyboard input?

问题描述

code> private var sound：Sound;
private var channel：SoundChannel;
private const INCREMENT：Number = 0.2; //将其改为你喜欢的

sound = new Sound（）;
sound.addEventListener（Event.COMPLETE，onLoad）;
sound.load（new URLRequest（song.mp3））;

函数onLoad（e：Event）：void
{
channel = sound.play（）;
if（stage）
{
stage.addEventListener（KeyboardEvent.KEY_UP，onKey）;

else
trace（从舞台上的显示对象调用）;

函数onKey（e：KeyboardEvent）：void
{
var tr：SoundTransform = channel.soundTransform;
var vol：Number = tr.volume;
if（e.keyCode == Keyboard.UP）
vol + = INCREMENT;
else if（e.keyCode == Keyboard.DOWN）
vol - = INCREMENT;
if（vol <0）//音量范围从0到1
vol = 0;
if（vol> 1）
vol = 1;
tr.volume = vol;
channel.soundTransform = tr;
}

How can I increase/decrease the volume of a Sound on key-press in ActionScript 3.0

解决方案

private var sound:Sound;
private var channel:SoundChannel;
private const INCREMENT:Number = 0.2;//change it as you like

sound = new Sound();
sound.addEventListener(Event.COMPLETE, onLoad);
sound.load(new URLRequest("song.mp3"));

function onLoad(e:Event):void
{
   channel = sound.play();
   if(stage)
   {
       stage.addEventListener(KeyboardEvent.KEY_UP, onKey);
   }
   else
       trace("call this from a display object on stage");
}
function onKey(e:KeyboardEvent):void
{
    var tr:SoundTransform = channel.soundTransform;
    var vol:Number = tr.volume;
    if(e.keyCode == Keyboard.UP)
       vol += INCREMENT;
    else if(e.keyCode == Keyboard.DOWN)
       vol -= INCREMENT;
    if(vol < 0)//volume ranges from 0 to 1
        vol = 0;
    if(vol > 1)
        vol = 1;
    tr.volume = vol;
    channel.soundTransform = tr;
}

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