WP7:在Silverlight处理时抑制XNA触摸输入？

Question

我在Mango中有一个XNA + Silverlight游戏:主要是XNA,顶部有一些Silverlight UI.我遇到的问题是当你点击按钮或与Silverlight控件交互时,触摸信息仍会传递给XNA游戏循环.你怎么压抑这个？

Answer 1

写了一个课程来为我进行跟踪。页面加载后（在 Loaded 处理程序中），创建它并为其提供根元素（以便它可以附加到 LayoutUpdated 事件）。注册在游戏过程中可能覆盖游戏表面的任何控件。然后只需调用 TouchesControl 并传入触摸位置即可确定是否应该忽略该点。它缓存控件的区域并在布局更新时更新它们。

应该适用于移动、改变大小或折叠/展开的矩形元素。

public class ControlTouchTracker
{
    private List<FrameworkElement> controls = new List<FrameworkElement>();
    private Dictionary<FrameworkElement, ControlRegion> controlBounds = new Dictionary<FrameworkElement, ControlRegion>();

    public ControlTouchTracker(FrameworkElement rootElement)
    {
        rootElement.LayoutUpdated += this.OnLayoutUpdated;
    }

    public void RegisterControl(FrameworkElement control)
    {
        controls.Add(control);
    }

    public void RemoveControl(FrameworkElement control)
    {
        controls.Remove(control);
        controlBounds.Remove(control);
    }

    private void OnLayoutUpdated(object sender, EventArgs e)
    {
        foreach (Control control in this.controls)
        {
            this.RefreshControlBounds(control);
        }
    }

    private void RefreshControlBounds(FrameworkElement control)
    {
        if (this.ControlIsVisible(control))
        {
            try
            {
                GeneralTransform controlTransform = control.TransformToVisual(Application.Current.RootVisual);
                Point offset = controlTransform.Transform(new Point(0, 0));

                this.controlBounds[control] = new ControlRegion
                {
                    Left = (float)offset.X,
                    Right = (float)(offset.X + control.ActualWidth),
                    Top = (float)offset.Y,
                    Bottom = (float)(offset.Y + control.ActualHeight)
                };
            }
            catch (ArgumentException)
            {
            }
        }
        else
        {
            if (this.controlBounds.ContainsKey(control))
            {
                this.controlBounds.Remove(control);
            }
        }
    }

    private bool ControlIsVisible(FrameworkElement control)
    {
        // End case
        if (control == null)
        {
            return true;
        }

        if (control.Visibility == Visibility.Collapsed)
        {
            return false;
        }

        return this.ControlIsVisible(control.Parent as FrameworkElement);
    }

    public bool TouchesControl(Vector2 touchPosition)
    {
        foreach (ControlRegion region in this.controlBounds.Values)
        {
            if (touchPosition.X >= region.Left && touchPosition.X <= region.Right &&
                touchPosition.Y >= region.Top && touchPosition.Y <= region.Bottom)
            {
                return true;
            }
        }

        return false;
    }

    public class ControlRegion
    {
        public float Left { get; set; }
        public float Right { get; set; }
        public float Top { get; set; }
        public float Bottom { get; set; }
    }
}

（编辑）更新了示例以处理父元素的更改Visibility。