Silverlight工具包ContextMenu：右键单击哪个控件？ [英] Silverlight Toolkit ContextMenu: Which control was right-clicked?

问题描述

Silverlight工具包具有一个漂亮的ContextMenu，可以在多个控件实例之间共享，例如Textbox。共享可能是由于在容器中声明了ContextMenu，该容器还承载其他控件。

The Silverlight Toolkit has a lovely ContextMenu, which can be shared among multiple instances of controls such as Textbox. Sharing can result from the ContextMenu being declared in a container which also hosts other controls.

<StackPanel>
    <TextBox x:Name="box1" Text="{Binding str1}"  />
    <TextBox x:Name="box2" Text="{Binding str2}"  />
    <toolkit:ContextMenuService.ContextMenu>
        <toolkit:ContextMenu Name="cm">
            <toolkit:MenuItem Name="cmiCut" Header="Cut" />
            <toolkit:MenuItem Name="cmiCopy" Header="Copy" />
            <toolkit:Separator/>
            <toolkit:MenuItem Name="cmiPaste" Header="Paste" />
        </toolkit:ContextMenu>
    </toolkit:ContextMenuService.ContextMenu>
</StackPanel>

也可以通过调用ContextMenuService.SetContextMenu来实现共享。

Sharing can also be achieved with a call to ContextMenuService.SetContextMenu.

当共享ContextMenu时，事件处理程序知道右键单击哪个控件以打开ContextMenu（例如，上下文）非常有帮助。有人可以提供一种有效的方法来做到这一点吗？

When the ContextMenu is shared, it's very helpful for the eventhandler to know which control was right-clicked to open the ContextMenu (e.g. context). Could anyone offer an efficient way to do this?

为了进行比较，在其他平台上可以满足以下需求：

For comparison, this need is addressed in other platforms as follows:

1. WPF的ContextMenu具有ContextMenu.PlacementTarget


2. WinForms的ContextMenuStrip具有ToolStripItem.Owner.SourceControl

谢谢

条例草案

推荐答案

我想感谢Erik Noren 博客关于这个话题。我在MainPage.xaml上的Visibility = Collapsed中定义了矩形的ContextMenu，以便它不处理鼠标右键事件。在页面上的任何位置单击鼠标右键时，我都会使用

I'd like to thank Erik Noren for blogging on this topic. I defined my ContextMenu in a Rectangle with Visibility=Collapsed on my MainPage.xaml so that it doesn't handle the mouse right click event. When the right mouse button is clicked anywhere on the page, I use

VisualTreeHelper.FindElementsInHostCoordinates

在单击位置标识一个文本框，然后打开ContextMenu。 Erik的具有SelectedText依赖项属性的控件的查找技巧非常出色。

to identify a Textbox at the click position and then open the ContextMenu. Erik's technique for finding a control with SelectedText dependency property is brilliant.

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