Question

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

Answer 1

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.