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我可以将一个按钮传递到它自己的MouseEvent函数中吗?

movieclip flash actionscript-3

Joseph Webber · 技术社区 · 11 年前

我在FlashDevelop中使用Flash发布了多个MovieClip符号(我的示例中只使用2个)。每个都有3帧作为默认值,悬停并单击,我将其用作按钮。

private var btnPlay:PlayButton, btnQuit:QuitButton;

btnPlay = new PlayButton();
btnQuit = new QuitButton();

btnPlay.addEventListener(MouseEvent.ROLL_OVER, onRollOverHandler);
btnPlay.addEventListener(MouseEvent.ROLL_OUT, onRollOutHandler);
btnPlay.addEventListener(MouseEvent.MOUSE_DOWN, onPressHandler);
btnPlay.addEventListener(MouseEvent.MOUSE_UP, onReleaseHandler);

btnPlay.buttonMode = true;
btnPlay.useHandCursor = true;

function onRollOverHandler(myEvent:MouseEvent):void {
    btnPlay.gotoAndStop(2);
}

function onRollOutHandler(myEvent:MouseEvent):void {
    btnPlay.gotoAndStop(1);
}

function onPressHandler(myEvent:MouseEvent):void {
    btnPlay.gotoAndStop(3);
}

function onReleaseHandler(myEvent:MouseEvent):void {
    btnPlay.gotoAndStop(2);
}

// Same code for btnQuit here, but replace btnPlay with btnQuit

除了向每个按钮添加新的EventListener,这些按钮几乎与我上面所做的相同,有没有一种方法可以将按钮本身传递给MouseEvent函数?(我意识到这可能很难,因为所有按钮都是自己的类)

btnPlay.addEventListener(MouseEvent.ROLL_OVER, onRollOverHandler(btnPlay));
btnPlay.addEventListener(MouseEvent.ROLL_OUT, onRollOutHandler(btnPlay));
btnPlay.addEventListener(MouseEvent.MOUSE_DOWN, onPressHandler(btnPlay));
btnPlay.addEventListener(MouseEvent.MOUSE_UP, onReleaseHandler(btnPlay));

function onRollOverHandler(myEvent:MouseEvent, inButton:MovieClip):void {
    inButton.gotoAndStop(2);
}

function onRollOutHandler(myEvent:MouseEvent, inButton:MovieClip):void {
    inButton.gotoAndStop(1);
}

function onPressHandler(myEvent:MouseEvent, inButton:MovieClip):void {
    inButton.gotoAndStop(3);
}

function onReleaseHandler(myEvent:MouseEvent, inButton:MovieClip):void {
    inButton.gotoAndStop(2);
}

2 回复 | 直到 11 年前

Dave 11 年前

也许我误解了,但“event.target”为您提供了已单击按钮的参考。因此,如果您想对单击的按钮执行某些操作,可以编写:

myEvent.target.gotoAndStop(1);

或者有时您可能需要使用“currentTarget”。您仍然需要为每个函数创建侦听器,但可以使用一组处理程序。

Craig 11 年前

简单的回答是:不。您可能会遇到一些麻烦来重写MouseEvent类,并允许它发送额外的参数,但在这种情况下为什么要麻烦呢?你似乎没有保存任何代码。

轻微更新:

这是对原始代码的一个可能有用的简化。它节省了几行代码,只使用一个处理程序函数。显然,“trace”语句可以被各种“gotoAndStop()”语句替换:

btnPlay.addEventListener(MouseEvent.ROLL_OVER, HandleAll);
btnPlay.addEventListener(MouseEvent.ROLL_OUT, HandleAll);
btnPlay.addEventListener(MouseEvent.MOUSE_DOWN, HandleAll);
btnPlay.addEventListener(MouseEvent.MOUSE_UP, HandleAll);

function HandleAll(e)
{
    if (e.type == "rollOver")  trace("rollover");
    if (e.type == "rollOut")   trace("rollout");
    if (e.type == "mouseDown") trace("mousedown");
    if (e.type == "mouseUp")   trace("mouseup");
}