/*
* private static Visual GetNearestVisual(object value)
* {
* Visual visual = null;
* if (value != null)
* {
* visual = value as Visual;
* if (visual == null)
* {
* ContentElement ce = value as ContentElement;
* if (ce != null)
* {
* visual = ce.GetUIParent() as Visual;
* }
* }
* }
* return visual;
* }
*/
private static DependencyObject GetRoot(DependencyObject element)
{
if (element == null)
{
return(null);
}
DependencyObject parent = null;
DependencyObject dependencyObject = element;
ContentElement ce = element as ContentElement;
if (ce != null)
{
dependencyObject = ce.GetUIParent();
}
while (dependencyObject != null)
{
parent = dependencyObject;
dependencyObject = VisualTreeHelper.GetParent(dependencyObject);
}
return(parent);
}
private static DependencyObject GetParentScope(DependencyObject childScope)
{
// Get the parent element of the childScope element
DependencyObject parent = null;
UIElement element = childScope as UIElement;
ContentElement contentElement = (element == null) ? childScope as ContentElement : null;
UIElement3D element3D = (element == null && contentElement == null) ? childScope as UIElement3D : null;
if (element != null)
{
parent = element.GetUIParent(true);
}
else if (contentElement != null)
{
parent = contentElement.GetUIParent(true);
}
else if (element3D != null)
{
parent = element3D.GetUIParent(true);
}
if (parent != null)
{
// Get the next focus scope above this one
return(FocusManager.GetFocusScope(parent));
}
return(null);
}
internal static void InvalidateAutomationAncestors(DependencyObject o)
{
UIElement e = null;
UIElement3D e3d = null;
ContentElement ce = null;
Stack <DependencyObject> branchNodeStack = new Stack <DependencyObject>();
bool continueInvalidation = true;
while (o != null && continueInvalidation)
{
continueInvalidation &= InvalidateAutomationPeer(o, out e, out ce, out e3d);
//
// Invoke InvalidateAutomationAncestorsCore
//
bool continuePastVisualTree = false;
if (e != null)
{
continueInvalidation &= e.InvalidateAutomationAncestorsCore(branchNodeStack, out continuePastVisualTree);
// Get element's visual parent
o = e.GetUIParent(continuePastVisualTree);
}
else if (ce != null)
{
continueInvalidation &= ce.InvalidateAutomationAncestorsCore(branchNodeStack, out continuePastVisualTree);
// Get element's visual parent
o = (DependencyObject)ce.GetUIParent(continuePastVisualTree);
}
else if (e3d != null)
{
continueInvalidation &= e3d.InvalidateAutomationAncestorsCore(branchNodeStack, out continuePastVisualTree);
// Get element's visual parent
o = e3d.GetUIParent(continuePastVisualTree);
}
}
}
// Walk up the parent chain to find the closest element with IsFocusScope=true
private static DependencyObject _GetFocusScope(DependencyObject d)
{
if (d == null)
{
return(null);
}
if ((bool)d.GetValue(IsFocusScopeProperty))
{
return(d);
}
// Step 1: Walk up the logical tree
UIElement uiElement = d as UIElement;
if (uiElement != null)
{
DependencyObject logicalParent = uiElement.GetUIParentCore();
if (logicalParent != null)
{
return(GetFocusScope(logicalParent));
}
}
else
{
ContentElement ce = d as ContentElement;
if (ce != null)
{
DependencyObject logicalParent = ce.GetUIParent(true);
if (logicalParent != null)
{
return(_GetFocusScope(logicalParent));
}
}
else
{
UIElement3D uiElement3D = d as UIElement3D;
if (uiElement3D != null)
{
DependencyObject logicalParent = uiElement3D.GetUIParentCore();
if (logicalParent != null)
{
return(GetFocusScope(logicalParent));
}
}
}
}
// Step 2: Walk up the visual tree
if (d is Visual || d is Visual3D)
{
DependencyObject visualParent = VisualTreeHelper.GetParent(d);
if (visualParent != null)
{
return(_GetFocusScope(visualParent));
}
}
// If visual and logical parent is null - then the element is implicit focus scope
return(d);
}
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);
}
private IInputElement CriticalHitTest(Point point, bool isSynchronize)
{
IInputElement over = null;
if (_activeSource != null)
{
switch (_captureMode)
{
case CaptureMode.None:
// No capture, do a regular hit-test.
if (_isDown)
{
if (isSynchronize)
{
// In a synchronize call, we need to hit-test the window in addition to the element
over = GlobalHitTest(point, _activeSource);
}
else
{
// Just hit-test the element
over = LocalHitTest(point, _activeSource);
}
EnsureValid(ref over);
}
break;
case CaptureMode.Element:
// Capture is to a specific element, so the device will always be over that element.
over = _captured;
break;
case CaptureMode.SubTree:
// Capture is set to an entire subtree. Hit-test to determine the element (and window)
// the device is over. If the element is within the captured sub-tree (which can span
// multiple windows), then the device is over that element. If the element is not within
// the sub-tree, then the device is over the captured element.
{
IInputElement capture = InputElement.GetContainingInputElement(_captured as DependencyObject);
if (capture != 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.
over = GlobalHitTest(point, _activeSource);
}
EnsureValid(ref over);
// 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 (over != null)
{
IInputElement ieTest = over;
while ((ieTest != null) && (ieTest != _captured))
{
UIElement eTest = ieTest as UIElement;
if (eTest != null)
{
ieTest = InputElement.GetContainingInputElement(eTest.GetUIParent(true));
}
else
{
ContentElement ceTest = ieTest as ContentElement;
if (ceTest != null)
{
ieTest = InputElement.GetContainingInputElement(ceTest.GetUIParent(true));
}
else
{
UIElement3D e3DTest = (UIElement3D)ieTest;
ieTest = InputElement.GetContainingInputElement(e3DTest.GetUIParent(true));
}
}
}
if (ieTest != _captured)
{
// If we missed the capture point, consider the device over the capture point.
over = _captured;
}
}
else
{
// If we didn't hit anything, consider the device over the capture point.
over = _captured;
}
}
break;
}
}
return(over);
}