protected virtual PointHitTestResult HitTestCore(PointHitTestParameters param)
{
if (GetHitTestBounds().Contains(param.HitPoint))
{
return(new PointHitTestResult(param.HitPoint, this));
}
return(null);
}
protected virtual HitTestResultBehavior HitTestOverride(PointHitTestParameters param, HitTestFilterCallback <Visual> filter, HitTestResultCallback <PointHitTestResult> resultCallback)
{
var hitTestResult = HitTestCore(param);
if (hitTestResult != null)
{
return(resultCallback(hitTestResult));
}
return(HitTestResultBehavior.Continue);
}
private HitTestResultBehavior HitTestPoint(PointHitTestParameters param, HitTestFilterCallback <Visual> filter, HitTestResultCallback <PointHitTestResult> resultCallback)
{
if (_bboxSubgraph.Contains(param.HitPoint))
{
var hitTestFilterBehavior = HitTestFilterBehavior.Continue;
if (filter != null)
{
hitTestFilterBehavior = filter(this);
if (hitTestFilterBehavior == HitTestFilterBehavior.ContinueSkipSelfAndChildren)
{
return(HitTestResultBehavior.Continue);
}
if (hitTestFilterBehavior == HitTestFilterBehavior.Stop)
{
return(HitTestResultBehavior.Stop);
}
}
var hitPoint = param.HitPoint;
var point = hitPoint;
if (hitTestFilterBehavior != HitTestFilterBehavior.ContinueSkipChildren)
{
foreach (var child in VisualChildren)
{
var childPoint = point - child.VisualOffset;
param.SetHitPoint(childPoint);
var hitTestResultBehavior = child.HitTestPoint(param, filter, resultCallback);
param.SetHitPoint(hitPoint);
if (hitTestResultBehavior == HitTestResultBehavior.Stop)
{
return(HitTestResultBehavior.Stop);
}
}
}
if (hitTestFilterBehavior != HitTestFilterBehavior.ContinueSkipSelf)
{
param.SetHitPoint(point);
var hitTestResultBehavior = this.HitTestOverride(param, filter, resultCallback);
param.SetHitPoint(hitPoint);
if (hitTestResultBehavior == HitTestResultBehavior.Stop)
{
return(HitTestResultBehavior.Stop);
}
}
}
return(HitTestResultBehavior.Continue);
}
public static void HitTest(Visual visual, PointHitTestParameters param, HitTestFilterCallback <Visual> filter, HitTestResultCallback <PointHitTestResult> resultCallback)
{
visual.HitTest(param, filter, resultCallback);
}
protected virtual PointHitTestResult HitTestOverride(PointHitTestParameters param)
{
return(null);
}
internal void HitTest(PointHitTestParameters param, HitTestFilterCallback <Visual> filter, HitTestResultCallback <PointHitTestResult> resultCallback)
{
Precompute();
HitTestPoint(param, filter, resultCallback);
}
