AS3：鼠標單擊事件不起作用

Question

背景：

嘗試制作一個簡單的“丟球”游戲。

該代碼位於時間軸的第一幀內。 舞台上沒有其他東西了。

問題：

使用QuickBox2D，我做了一個簡單的If語句，該語句根據Mouse-x的位置放置和放置對象：

if (MouseEvent.CLICK) {
sim.addCircle({x:mouseX, y:1, radius:0.25, density:5});

我導入了MouseEvent庫：

import flash.events.MouseEvent;

如果單擊，什么也沒有發生，也沒有輸出錯誤。

實際操作中查看它： http : //gabrielmeono.com/download/Lucky_Hit_Alpha.swf http://gabrielmeono.com/download/Lucky_Hit_Alpha.fla

完整代碼：

    [SWF(width = 350, height = 600, frameRate = 60)]  
import com.actionsnippet.qbox.*;  
import flash.events.MouseEvent;

var sim:QuickBox2D = new QuickBox2D(this);  
sim.createStageWalls();
//var ball:sim.addCircle({x:mouseX, y:1, radius:0.25, density:5}); //

// make a heavy circle 

sim.addCircle({x:3, y:1, radius:0.25, density:5});
sim.addCircle({x:2, y:1, radius:0.25, density:5});
sim.addCircle({x:4, y:1, radius:0.25, density:5});
sim.addCircle({x:5, y:1, radius:0.25, density:5});
sim.addCircle({x:6, y:1, radius:0.25, density:5});
// create a few platforms  

sim.addBox({x:3, y:2, width:4, height:0.2, density:0, angle:0.1});
// make 26 dominoes  
for (var i:int = 0; i<7; i++){  
//End
     sim.addCircle({x:1 + i * 1.5, y:16, radius:0.1, density:0});
     sim.addCircle({x:2 + i * 1.5, y:15, radius:0.1, density:0});

//Mid end

      sim.addCircle({x:0 + i * 2, y:14, radius:0.1, density:0});
      sim.addCircle({x:0 + i * 2, y:13, radius:0.1, density:0});
      sim.addCircle({x:0 + i * 2, y:12, radius:0.1, density:0});
      sim.addCircle({x:0 + i * 2, y:11, radius:0.1, density:0});
      sim.addCircle({x:0 + i * 2, y:10, radius:0.1, density:0});


      //Middle Start
     sim.addCircle({x:0 + i * 1.5, y:09, radius:0.1, density:0});
     sim.addCircle({x:1 + i * 1.5, y:08, radius:0.1, density:0});
     sim.addCircle({x:0 + i * 1.5, y:07, radius:0.1, density:0});
     sim.addCircle({x:1 + i * 1.5, y:06, radius:0.1, density:0});
} 

if (MouseEvent.CLICK) {
    sim.addCircle({x:mouseX, y:1, radius:0.25, density:5});

sim.start();  
/*sim.mouseDrag();*/  




    }

Answer 1

您應該創建鼠標事件偵聽器：

addEventListener(MouseEvent.CLICK, add_circle_handler);

function add_circle_handler(event:MouseEvent):void {
      sim.addCircle({x:mouseX, y:1, radius:0.25, density:5});
} 

當您不再需要添加圈子時，請不要忘記刪除事件監聽器。 與偵聽器一起使用時的最佳做法（與內存管理有關）：

removeEventListener(MouseEvent.CLICK, add_circle_handler);

Answer 2

您需要為鼠標事件添加事件偵聽器：

addEventListener(MouseEvent.CLICK, mouseClickHandler);

protected function mouseClickHandler(event:MouseEvent):void
{
    sim.addCircle({x:mouseX, y:1, radius:0.25, density:5});
}

Answer 3

那是因為您在聽鼠標單擊錯誤。

代替

if (MouseEvent.CLICK) {
    sim.addCircle({x:mouseX, y:1, radius:0.25, density:5});
    sim.start();  
    /*sim.mouseDrag();*/  
}

你需要做

addEventListener(MouseEvent.CLICK, clicked);

function clicked(e:MouseEvent) {

    sim.addCircle({x:mouseX, y:1, radius:0.25, density:5});
    sim.start();  
    /*sim.mouseDrag();*/ 
}

當您不需要再聽其他點擊時，請執行

removeEventListener(MouseEvent.CLICK, clicked);

刪除事件監聽器（以釋放內存）