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NotDan
NotDan

Reputation: 32213

WPF Get Element(s) under mouse

Is there a way with WPF to get an array of elements under the mouse on a MouseMove event?

Upvotes: 37

Views: 48148

Answers (3)

David Schmitt
David Schmitt

Reputation: 59316

From "WPF Unleashed", page 383:

Visual hit testing can inform you about all Visuals that intersect a location, [...] you must use [...] the [VisualTreeHelper.]HitTest method that accepts a HitTestResultCallback delegate. Before this version of HitTest returns, the delegate is invoked once for each relevant Visual, starting from the topmost and ending at the bottommost.

The signature of such a callback is

HitTestResultBehavior Callback(HitTestResult result)

and it has to return HitTestResultBehaviour.Continue to receive further hits, as shown below (from the linked page on MSDN):

// Return the result of the hit test to the callback.
public HitTestResultBehavior MyHitTestResult(HitTestResult result)
{
    // Add the hit test result to the list that will be processed after the enumeration.
    hitResultsList.Add(result.VisualHit);

    // Set the behavior to return visuals at all z-order levels.
    return HitTestResultBehavior.Continue;
}

For further information, please consult the MSDN documentation for VisualTreeHelper.HitTest.

Upvotes: 41

Andy
Andy

Reputation: 30418

You can also try using the Mouse.DirectlyOver property to get the top-most element that is under the mouse.

Upvotes: 47

Espo
Espo

Reputation: 41919

Can you use the VisualTreeHelper.HitTest ?

http://lukieb.blogspot.com/2008/07/visualtreehelperhittest.html

Upvotes: 4

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