wpf WPF在鼠标下获取元素
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WPF Get Element(s) under mouse
提问by NotDan
Is there a way with WPF to get an array of elements under the mouse on a MouseMove event?
WPF 有没有办法在 MouseMove 事件上获取鼠标下的元素数组？
回答by Andy
You can also try using the Mouse.DirectlyOver property to get the top-most element that is under the mouse.
您还可以尝试使用 Mouse.DirectlyOver 属性来获取鼠标下方的最顶部元素。
回答by David Schmitt
From "WPF Unleashed", page 383:
来自“ WPF Unleashed”，第 383 页：
Visual hit testing can inform you about all
Visuals that intersect a location, [...] you must use [...] the[VisualTreeHelper.]HitTestmethod that accepts aHitTestResultCallbackdelegate. Before this version ofHitTestreturns, the delegate is invoked once for each relevantVisual, starting from the topmost and ending at the bottommost.
视觉命中测试可以告知您与某个位置相交的所有
Visuals，[...] 您必须使用 [...][VisualTreeHelper.]HitTest接受HitTestResultCallback委托的 方法 。在此版本HitTest返回之前，为每个相关的 调用一次委托Visual，从最顶部开始到最底部结束。
The signature of such a callback is
这种回调的签名是
HitTestResultBehavior Callback(HitTestResult result)
and it has to return HitTestResultBehaviour.Continueto receive further hits, as shown below (from the linked page on MSDN):
它必须返回HitTestResultBehaviour.Continue以接收更多点击，如下所示（来自 MSDN 上的链接页面）：
// 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.
有关详细信息，请参阅MSDN 文档中的VisualTreeHelper.HitTest.
