为什么GraphicsDevice.Viewport在错误的地方？

Question

我从GraphicsControl

派生Control

public abstract class GraphicsControl : Control
{
    GraphicsDeviceService graphicsDeviceService;  

    protected override void OnCreateControl ( )
    {
        // Don't initialize the graphics device if we are running in the designer.
        if (!DesignMode)
        {
            graphicsDeviceService =
                GraphicsDeviceService.AddReference
                (
                Handle,
                new System.Drawing.Size ( ClientSize.Width,
                    ClientSize.Height )
                );

            // Register the service, so components like ContentManager can find it.
            services.AddService ( graphicsDeviceService );

            // Give derived classes a chance to initialize themselves.
            Initialize ( );
        }

        base.OnCreateControl ( );
    }

    string DeviceBeginDraw ( )
    {
        //    ensure drawing is valid

        //    set up viewport
        Viewport viewport = new Viewport 
            ( 
                ClientRectangle.X,
                ClientRectangle.Y, 
                ClientSize.Width, 
                ClientSize.Height 
            );

        viewport.MinDepth = 0;
        viewport.MaxDepth = 1;

        GraphicsDevice.Viewport = viewport;


        if (viewport.Bounds.Contains ( mouse.X, mouse.Y ))
        {
            //  fire event
            OnMouseMoved(this, 
                new MouseMovedEventArgs(new Microsoft.Xna.Framework.Point(mouse.X, mouse.Y)));
        }
    }
}

然后派生的Canvas 控件如下：

public sealed class Canvas : GraphicsControl
{
    //    subscribe to MousedMoved event
}

响应鼠标移动的区域位于屏幕左上角（0,0）。整个区域与预期的基本控件重叠，但不是Docked，填充Parent控件。见图：

谁能告诉我自己可能做错了什么？如果需要其他代码，请询问。

此外，MSDN seems to reference ClientRectangle作为要使用的属性。

Answer 1

看起来我在这里发现了问题：

graphicsDeviceService =
    GraphicsDeviceService.AddReference
    (
    Handle,
    new System.Drawing.Size ( ClientSize.Width,
        ClientSize.Height )
    );

由于GraphicControl派生自Control，base.Handle传递基本控件类的句柄而不是拥有System.Windows.Forms.Form的句柄。一旦拥有Form的Handle传递给graphicsDeviceService，鼠标就会完美地跟踪。

public abstract class GraphicsControl : Control
{
    protected GraphicsControl ( System.Windows.Forms.Form Owner )
    {
        owner = Owner;
    }

    protected override void OnCreateControl ( )
    {
            // construction logic
            graphicsDeviceService =
                GraphicsDeviceService.AddReference
                (
                    owner.Handle,
                    vpRectangle
                );

            // more construction logic

            // Give derived classes a chance to initialize themselves.
            Initialize ( );
        }

        base.OnCreateControl ( );
    }

}