點擊進入後禁用按鈕as3

Question

我是as3的新手，並且試着四處搜尋我的問題的答案，但它似乎沒有任何效果。我有一個xml加載文件，當用戶點擊正確的選項（4）時，他們得到了一個得分。我試圖在點擊一次後禁用按鈕，但這種情況沒有發生。任何幫助將不勝感激。 這是我有的部分。

function setupButtons():void { 
    for (var obj:Object in buttons) 
    { 
     buttons[obj].addEventListener(MouseEvent.CLICK, checkAnswer); 
    } 
     buttons[obj].addEventListener(MouseEvent.MOUSE_UP,disableBtns); 
} 

function disableBtns(evt:MouseEvent):void { 
    for (var obj:Object in buttons) 
    evt.currentTarget.removeEventListener(MouseEvent.MOUSE_UP,disableBtns); 
    buttons[obj].enabled = false; 
} 

Answer 1

以下是旁邊的原代碼，以幫助解釋了什麼是可能發生的一些意見：

function setupButtons():void { 
    //you're adding a click listener for every object in `buttons` 
    for (var obj:Object in buttons) 
    { 
     buttons[obj].addEventListener(MouseEvent.CLICK, checkAnswer); 
    } 

    //this next line seems out of place, 
    //it is NOT a part of your for loop above so it will only run once, 
    //The value of obj will be the LAST item in the for loop above 

    buttons[obj].addEventListener(MouseEvent.MOUSE_UP,disableBtns); 
} 

function disableBtns(evt:MouseEvent):void { 
    //you don't have curly braces on this next for loop line 
    //this means it's only going to run the line immediately following the loop as part of the loop. 
    for (var obj:Object in buttons) 
    //your attempting to remove the same listener over and over again (since this line is in a loop) 
    evt.currentTarget.removeEventListener(MouseEvent.MOUSE_UP,disableBtns); 
    //this next line is not part of the loop above. 
    //I imagine you only want to disable the button that was clicked (evt.currentTarget) 
    //This will only disable whatever the last value of obj was in the loop above 
    buttons[obj].enabled = false; 
} 

---

現在，這裏是一個簡單的代碼重構，可以幫助：

//first, just have one click listener for each button, forget the mouse up listener 
function setupButtons():void { 
    for (var obj:Object in buttons){ 
     buttons[obj].addEventListener(MouseEvent.CLICK, btnClick); 
    } 
} 

function btnClick(evt:MouseEvent):void { 
    //If buttons are of the SimpleButton class, you can just disable them 
    evt.currentTarget.enabled = false; 

    //OR, if the buttons are not of the SimpleButton class 
    evt.currentTarget.mouseChildren = false; 
    evt.currentTarget.mouseEnabled = false; 

    //OR, just remove the click listener 
    evt.currentTarget.removeEventListener(MouseEvent.CLICK, btnClick); 

    //run the checkAnswer function 
    checkAnswer(evt); 
} 

---

要禁用所有按鈕whe ñ任何1被點擊，你可以這樣做：

function btnClick(evt:MouseEvent):void { 
    for (var obj:Object in buttons){ 
     buttons[obj].removeEventListener(MouseEvent.CLICK, btnClick); 
    } 

    //run the checkAnswer function 
    checkAnswer(evt); 
}