WPF - Determining if Mouse Is Over a UIElement
I have some xaml markup that looks essentially like this:
<Canvas x:Name="A">
<Canvas x:Name="B"/>
</Canvas>
I want to determine if the mouse is over Canvas
B.
When I click while my mouse is over Canvas B, Mouse.DirectlyOver returns Canvas A (a开发者_高级运维s I expect). I then get a reference to Canvas B from Canvas A but when I check Canvas B's IsMouseOver property it returns false.
What is the best way to determine if the mouse is over Canvas B given the xaml above?
You can use the IsMouseOver property to determine if the mouse is over a given control or not:
if(this.B.IsMouseOver)
DoSomethingNice();
While Mouse.DirectlyOver can work, if the mouse is over a control contained by the Canvas
, that control will be returned instead of the Canvas
itself. IsMouseOver
will work properly even in this case.
I found an answer here on SO that should help you: StackOverflow: WPF Ways to find controls
Just for reference:
I was just searching for a way to find out if my Mouse is over my applications window at all, and I successfully found this out using:
if (Mouse.DirectlyOver != null)
DoSomethingNice();
While debugging Mouse.DirectlyOver it seemed to be that it should have found your Canvas B, as it looks for the topmost element - so your example should work. It didn't give me a dependency object, but I guess you could just compare it to your canvas using this is the codebehind (untested):
if (Mouse.DirectlyOver == this.B)
DoSomethingNice();
Here you can find from mouse click event with hit test.
{
Point pt = e.GetPosition((UIElement)sender);
// Perform the hit test against a given portion of the visual object tree.
HitTestResult result = VisualTreeHelper.HitTest(this.B, pt);
if (result != null)
{
// Perform action on hit visual object.
}
}
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