c# - 按住右键单击与 Manipulation 事件冲突

Question

我正在使用 Manipulation 事件(IsManipulationEnabled、ManipulationDelta 等)来移动和缩放图像。这很好用。我还想使用右键单击创建一个矩形选区以在图像上定义一个区域(拖放，通常的方式，只有右键单击)。在触摸(Surface)和非触摸(Win 7)设备上使用鼠标都可以正常工作。虽然，当在 Surface 上“右键单击”(因此用手指点击并按住)时，我看到典型的小方 block 出现，但是当我在那之后移动手指时，它会移动图像，而不是绘制矩形。看起来 Manipulation 事件优先于“手指右键单击”。我做错了什么？

 <Grid
    Name="theGrid"
    MouseMove="OnMouseMove"
    MouseRightButtonUp="theGrid_MouseRightButtonUp"
    MouseRightButtonDown="theGrid_MouseRightButtonDown"
    Background="Black">

    <Rectangle Name="RectangleContainingBackgroundImage"
               IsManipulationEnabled="True"
               RenderTransform="{Binding Path=ImageTransform}">
        <Rectangle.Fill>
            <ImageBrush x:Name="BackgroundImage" Stretch="Uniform"/>
        </Rectangle.Fill>
    </Rectangle>

开始时:

ScreenTouchManager touchManager = new ScreenTouchManager(this.theGrid);
this.RectangleContainingBackgroundImage.ManipulationStarting += touchManager.Image_ManipulationStarting;
this.RectangleContainingBackgroundImage.ManipulationDelta += touchManager.Image_ManipulationDelta;
this.DataContext = touchManager;

在 ScreenTouchManager 中:

public void Image_ManipulationStarting(object sender, ManipulationStartingEventArgs e)
{
    // Ask for manipulations to be reported relative to the grid
    e.ManipulationContainer = this.ManipContainer; // MC = constructor param
}

谢谢。

Answer 1

我做了一项研究，可能会在这里找到答案:http://www.mobilemotion.eu/?p=1396&lang=en

The VisualState changes are triggered by dedicated mouse events: For example, the Pressed state is reached when the button’s OnMouseLeftButtonDown event occurs. The finger touch-and-hold event is usually mapped to a click with the right mouse button (when tapping on the screen and not instantly releasing the finger, Windows interprets this as right-click operation) – the OnMouseLeftButtonDown event never fires, and the Pressed state is never reached!

希望这对您有所帮助。