internal DependencyObject GetUIParent(bool continuePastVisualTree)
{
DependencyObject e = null;
// Try to find a UIElement parent in the visual ancestry.
e = InputElement.GetContainingInputElement(_parent) as DependencyObject;
// If there was no InputElement parent in the visual ancestry,
// check along the logical branch.
if (e == null && continuePastVisualTree)
{
DependencyObject doParent = GetUIParentCore();
e = InputElement.GetContainingInputElement(doParent) as DependencyObject;
}
return(e);
}
internal static DependencyObject GetUIParent(DependencyObject child, bool continuePastVisualTree)
{
DependencyObject parent = null;
DependencyObject myParent = null;
// Try to find a UIElement parent in the visual ancestry.
if (child is Visual)
{
myParent = ((Visual)child).InternalVisualParent;
}
else
{
myParent = ((Visual3D)child).InternalVisualParent;
}
parent = InputElement.GetContainingUIElement(myParent) as DependencyObject;
// If there was no UIElement parent in the visual ancestry,
// check along the logical branch.
if (parent == null && continuePastVisualTree)
{
UIElement childAsUIElement = child as UIElement;
if (childAsUIElement != null)
{
parent = InputElement.GetContainingInputElement(childAsUIElement.GetUIParentCore()) as DependencyObject;
}
else
{
UIElement3D childAsUIElement3D = child as UIElement3D;
if (childAsUIElement3D != null)
{
parent = InputElement.GetContainingInputElement(childAsUIElement3D.GetUIParentCore()) as DependencyObject;
}
}
}
return(parent);
}
internal IInputElement FindTarget(PresentationSource inputSource, Point position)
{
IInputElement stylusOver = null;
switch (_captureMode)
{
case CaptureMode.None:
{
stylusOver = StylusDevice.GlobalHitTest(inputSource, position);
// We understand UIElements and ContentElements.
// If we are over something else (like a raw visual)
// find the containing element.
if (!InputElement.IsValid(stylusOver))
{
stylusOver = InputElement.GetContainingInputElement(stylusOver as DependencyObject);
}
}
break;
case CaptureMode.Element:
stylusOver = _stylusCapture;
break;
case CaptureMode.SubTree:
{
IInputElement stylusCapture = InputElement.GetContainingInputElement(_stylusCapture as DependencyObject);
if (stylusCapture != null && inputSource != null)
{
// We need to re-hit-test to get the "real" UIElement we are over.
// This allows us to have our capture-to-subtree span multiple windows.
// GlobalHitTest always returns an IInputElement, so we are sure to have one.
stylusOver = StylusDevice.GlobalHitTest(inputSource, position);
}
if (stylusOver != null && !InputElement.IsValid(stylusOver))
{
stylusOver = InputElement.GetContainingInputElement(stylusOver as DependencyObject);
}
// Make sure that the element we hit is acutally underneath
// our captured element. Because we did a global hit test, we
// could have hit an element in a completely different window.
//
// Note that we support the child being in a completely different window.
// So we use the GetUIParent method instead of just looking at
// visual/content parents.
if (stylusOver != null)
{
IInputElement ieTest = stylusOver;
UIElement eTest = null;
ContentElement ceTest = null;
while (ieTest != null && ieTest != stylusCapture)
{
eTest = ieTest as UIElement;
if (eTest != null)
{
ieTest = InputElement.GetContainingInputElement(eTest.GetUIParent(true));
}
else
{
ceTest = ieTest as ContentElement; // Should never fail.
ieTest = InputElement.GetContainingInputElement(ceTest.GetUIParent(true));
}
}
// If we missed the capture point, we didn't hit anything.
if (ieTest != stylusCapture)
{
stylusOver = _stylusCapture;
}
}
else
{
// We didn't hit anything. Consider the stylus over the capture point.
stylusOver = _stylusCapture;
}
}
break;
}
return(stylusOver);
}
