private static IEnumerable <DependencyObject> GetDescendantsInZOrder(DependencyObject root)
{
if (root != null)
{
int childCount = VisualTreeHelper.GetChildrenCount(root);
if (childCount > 0)
{
for (int i = childCount - 1; i >= 0; --i)
{
DependencyObject child = VisualTreeHelper.GetChild(root, i);
if (child != null)
{
foreach (DependencyObject dependencyObject in ModelHitTestHelper.GetDescendantsInZOrder(child))
{
if (dependencyObject != null)
{
yield return(dependencyObject);
}
}
yield return(child);
}
}
}
}
}
public static HitTestResult HitTest(Visual root, HitTestFilterCallback filterCallback, HitTestResultCallback resultCallback, HitTestParameters hitTestParameters, HitTestFilterCallback modelCallback)
{
ModelHitTestHelper.HitTestFilterCallbackWrapper filterCallbackWrapper = new ModelHitTestHelper.HitTestFilterCallbackWrapper(filterCallback);
ModelHitTestHelper.HitTestResultCallbackWrapper resultCallbackWrapper = new ModelHitTestHelper.HitTestResultCallbackWrapper(resultCallback, HitTestResultBehavior.Continue);
VisualTreeHelper.HitTest(root, filterCallbackWrapper.FilterCallback, resultCallbackWrapper.ResultCallback, hitTestParameters);
HitTestResult topMostHit = resultCallbackWrapper.TopMostHit;
bool flag = filterCallback == null && resultCallback == null;
VisualHitTestArgs args = new VisualHitTestArgs(root, root, hitTestParameters);
PointHitTestParameters hitTestParameters1 = hitTestParameters as PointHitTestParameters;
GeometryHitTestParameters hitTestParameters2 = hitTestParameters as GeometryHitTestParameters;
foreach (DependencyObject dependencyObject in ModelHitTestHelper.GetDescendantsInZOrder((DependencyObject)root))
{
if (dependencyObject != null)
{
if (filterCallback == null && topMostHit != null && dependencyObject == topMostHit.VisualHit)
{
resultCallbackWrapper.PlayResults();
return(resultCallbackWrapper.TopMostHit);
}
Visual visual = dependencyObject as Visual;
HitTestProvider singletonProvider = ModelHitTestHelper.GetSingletonProvider(dependencyObject);
if (singletonProvider != null && (modelCallback == null || modelCallback((DependencyObject)visual) != HitTestFilterBehavior.Continue))
{
args.UpdateChild(dependencyObject);
HitTestResult result = (HitTestResult)null;
if (hitTestParameters1 != null && visual != null)
{
PointHitTestResult pointHitTestResult = singletonProvider.HitTestPoint(args);
if (pointHitTestResult != null && pointHitTestResult.VisualHit != null)
{
result = (HitTestResult)pointHitTestResult;
}
}
else if (hitTestParameters2 != null && visual != null)
{
GeometryHitTestResult geometryHitTestResult = singletonProvider.HitTestGeometry(args);
if (geometryHitTestResult != null && geometryHitTestResult.IntersectionDetail != IntersectionDetail.Empty && geometryHitTestResult.IntersectionDetail != IntersectionDetail.NotCalculated)
{
result = (HitTestResult)geometryHitTestResult;
}
}
if (result != null)
{
HitTestFilterBehavior testFilterBehavior = filterCallbackWrapper.FilterCallback(dependencyObject);
switch (testFilterBehavior)
{
case HitTestFilterBehavior.Continue:
case HitTestFilterBehavior.Stop:
resultCallbackWrapper.InsertResult(result);
break;
}
if (flag && testFilterBehavior != HitTestFilterBehavior.ContinueSkipSelf || testFilterBehavior == HitTestFilterBehavior.Stop)
{
resultCallbackWrapper.PlayResults();
return(result);
}
}
}
}
}
resultCallbackWrapper.PlayResults();
return(resultCallbackWrapper.TopMostHit);
}
public static HitTestResult HitTest(Visual reference, Point point, HitTestFilterCallback filterCallback)
{
return(ModelHitTestHelper.HitTest(reference, filterCallback, (HitTestResultCallback)null, (HitTestParameters) new PointHitTestParameters(point), (HitTestFilterCallback)null));
}