Question

我是闪光灯的新手。我正在尝试为我的简单Flash应用程序显示一个简单的按钮（使用adobe flex builder 3）。

主项目文件Client2.as：

package
{
    import flash.display.Sprite;

    [SWF(width="600", height="600", frameRate="31", backgroundColor="#00FFFF")] //set project properties

    public class Client2 extends Sprite
    {   
        public function Client2() {
            trace("Client launched.");
            var loginGui:LoginInterface = new LoginInterface(); //load the login interface object
            loginGui.init(); //initialize the login interface
        }
    }
}

然后是LoginInterface.as类文件：

package
{
    import flash.display.Sprite;
    import flash.display.SimpleButton;

    public class LoginInterface extends Sprite
    {
        public function LoginInterface()
        {
            trace("LoginInterface object loaded.");
        }

        public function init():void
        {
            trace("LoginInterface init method was called.");

            var myButton:SimpleButton = new SimpleButton();

            //create the look of the states
            var down:Sprite = new Sprite();
            down.graphics.lineStyle(1, 0x000000);
            down.graphics.beginFill(0xFFCC00);
            down.graphics.drawRect(10, 10, 100, 30);

            var up:Sprite = new Sprite();
            up.graphics.lineStyle(1, 0x000000);
            up.graphics.beginFill(0x0099FF);
            up.graphics.drawRect(10, 10, 100, 30);

            var over:Sprite = new Sprite();
            over.graphics.lineStyle(1, 0x000000);
            over.graphics.beginFill(0x9966FF);
            over.graphics.drawRect(10, 10, 100, 30);

            // assign the sprites
            myButton.upState = up;
            myButton.overState = over;
            myButton.downState = down;
            myButton.hitTestState = up;

            addChild(myButton);



        }
    }
}

当我运行它时按钮没有显示。我做错了什么？

Answer 1

ActionScript3图形基于显示列表概念。基本上，必须将图形元素添加到显示列表中才能看到。

显示列表的根节点（实际上是树）是您的主类Client2。因此，您想要在屏幕上显示的任何内容都必须添加为此元素的子元素，如下所示：

addChild(loginGui);  //inside of your main class

同样，您的按钮必须添加到您的LoginInterface实例

addChild(myButton);  //inside of LoginInterface

为什么我的AS3 SimpleButton没有显示？

1 个答案: