WPF中DiagramSurface上的Selected项的上下文菜单

Question

I have a UI which is a diagramSurface object. While running the application i drag and drop a element(kind of a label) on top of it. I want to implement a CONTEXTMENU for this object.

I have Done this

<DiagramSurface>
     <DiagramSurface.ContextMenu>
         <ContextMenu >
                <MenuItem Header="Save" Click="MenuItem_Click"/>
         </ContextMenu>
     <DiagramSurface.ContextMenu>
</DiagramSurface>

By doing this , i am able to see the contextMenu if i click on surface where the object is not present. How to avoid this? I want to show the context menu only on the rightclick of the element.

Answer 1

As @Viv says (although I'm not sure why he didn't say it in an answer), the ContextMenu will appear when you right click anywhere on the control that you add it to. Therefore, if you add it to the DiagramSurface , it will appear when you click anywhere on that control. To fix your problem, remove the declaration from the DiagramSurface control.

Now, you need to add it to the control(s) that you drag and drop. You can do as @Viv says and define your ContextMenu in the Resources section:

<Application.Resources>
    <ContextMenu x:Key="ContextMenu">
        <MenuItem Header="Save" Click="MenuItem_Click"/>
    </ContextMenu>
</Application.Resources>

Then set it as the ContextMenu of the drag drop element from code:

ContextMenu menu = (ContextMenu)Application.Current.FindResource("ContextMenu");
element.ContextMenu = contextMenu;