private void ReevaluateCapturedWithinAsync(DependencyObject element, DependencyObject oldParent, bool isCoreParent)
{
if (element != null)
{
if (_capturedWithinTreeState == null)
{
_capturedWithinTreeState = new DeferredElementTreeState();
}
if (isCoreParent)
{
_capturedWithinTreeState.SetCoreParent(element, oldParent);
}
else
{
_capturedWithinTreeState.SetLogicalParent(element, oldParent);
}
}
if (_reevaluateCapture == null)
{
_reevaluateCapture = Dispatcher.BeginInvoke(DispatcherPriority.Input,
(DispatcherOperationCallback) delegate(object args)
{
TouchDevice thisRef = (TouchDevice)args;
thisRef._reevaluateCapture = null;
thisRef.OnReevaluateCapturedWithinAsync();
return(null);
}, this);
}
}
private void ReevaluateDirectlyOverAsync(DependencyObject element, DependencyObject oldParent, bool isCoreParent)
{
if (element != null)
{
if (_directlyOverTreeState == null)
{
_directlyOverTreeState = new DeferredElementTreeState();
}
if (isCoreParent)
{
_directlyOverTreeState.SetCoreParent(element, oldParent);
}
else
{
_directlyOverTreeState.SetLogicalParent(element, oldParent);
}
}
if (_reevaluateOver == null)
{
_reevaluateOver = Dispatcher.BeginInvoke(DispatcherPriority.Input,
(DispatcherOperationCallback) delegate(object args)
{
TouchDevice thisRef = (TouchDevice)args;
thisRef._reevaluateOver = null;
thisRef.OnHitTestInvalidatedAsync(this, EventArgs.Empty);
return(null);
}, this);
}
}
internal void OnOriginValueChanged(DependencyObject oldOrigin,
DependencyObject newOrigin,
IList <DependencyObject> otherOrigins,
ref DeferredElementTreeState oldTreeState,
Action <DependencyObject, bool> originChangedAction)
{
DeferredElementTreeState treeStateLocalCopy = oldTreeState;
oldTreeState = null;
// Determine if one needs to raise notifications of elements
// affected by the origin change irrespective of other origins
bool setOriginCacheFlag = ((originChangedAction != null) &&
(FlagOldOriginCache != CoreFlags.None) &&
(FlagNewOriginCache != CoreFlags.None));
// Step #1
// Update the cache flags for all elements in the ancestry
// of the element that got turned off and record the changed nodes
if (oldOrigin != null)
{
SetCacheFlagInAncestry(oldOrigin, false, treeStateLocalCopy, true, setOriginCacheFlag);
}
// Step #2
// Update the cache flags for all elements in the ancestry
// of the element that got turned on and record the changed nodes
if (newOrigin != null)
{
SetCacheFlagInAncestry(newOrigin, true, null, true, setOriginCacheFlag);
}
int otherCount = (otherOrigins != null) ? otherOrigins.Count : 0;
for (int i = 0; i < otherCount; i++)
{
// setOriginCacheFlag is false, because these flags should not be affected by other origins
SetCacheFlagInAncestry(otherOrigins[i], true, null, false, /*setOriginCacheFlag*/ false);
}
// Step #3
// Fire value changed on elements in the ancestry of the element that got turned off.
if (oldOrigin != null)
{
FirePropertyChangeInAncestry(oldOrigin, true /* oldValue */, treeStateLocalCopy, originChangedAction);
}
// Step #4
// Fire value changed on elements in the ancestry of the element that got turned on.
if (newOrigin != null)
{
FirePropertyChangeInAncestry(newOrigin, false /* oldValue */, null, originChangedAction);
}
if (oldTreeState == null && treeStateLocalCopy != null)
{
// Now that we have applied the old tree state, throw it away.
treeStateLocalCopy.Clear();
oldTreeState = treeStateLocalCopy;
}
}
private void SetCacheFlagInAncestry(DependencyObject element,
bool newValue,
DeferredElementTreeState treeState,
bool shortCircuit,
bool setOriginCacheFlag)
{
UIElement uie;
ContentElement ce;
UIElement3D uie3D;
CastElement(element, out uie, out ce, out uie3D);
bool isFlagSet = IsFlagSet(uie, ce, uie3D, FlagCache);
bool isFlagOriginCacheSet = (setOriginCacheFlag ? IsFlagSet(uie, ce, uie3D, (newValue ? FlagNewOriginCache : FlagOldOriginCache)) : false);
// If the cache flag value is undergoing change, record it and
// propagate the change to the ancestors.
if ((newValue != isFlagSet) ||
(setOriginCacheFlag && !isFlagOriginCacheSet) ||
!shortCircuit)
{
if (newValue != isFlagSet)
{
SetFlag(uie, ce, uie3D, FlagCache, newValue);
// NOTE: we toggle the changed flag instead of setting it so that that way common
// ancestors show resultant unchanged and do not receive any change notification.
SetFlag(uie, ce, uie3D, FlagChanged, !IsFlagSet(uie, ce, uie3D, FlagChanged));
}
if (setOriginCacheFlag && !isFlagOriginCacheSet)
{
SetFlag(uie, ce, uie3D, (newValue ? FlagNewOriginCache : FlagOldOriginCache), true);
}
// Check for block reverse inheritance flag, elements like popup want to set this.
if (BlockReverseInheritance(uie, ce, uie3D))
{
return;
}
// Propagate the flag up the visual and logical trees. Note our
// minimal optimization check to avoid walking both the core
// and logical parents if they are the same.
{
DependencyObject coreParent = DeferredElementTreeState.GetInputElementParent(element, treeState);
DependencyObject logicalParent = DeferredElementTreeState.GetLogicalParent(element, treeState);
if (coreParent != null)
{
SetCacheFlagInAncestry(coreParent, newValue, treeState, shortCircuit, setOriginCacheFlag);
}
if (logicalParent != null && logicalParent != coreParent)
{
SetCacheFlagInAncestry(logicalParent, newValue, treeState, shortCircuit, setOriginCacheFlag);
}
}
}
}
private void UpdateReverseInheritedProperty(bool capture, IInputElement oldElement, IInputElement newElement)
{
// consdier caching the array
List <DependencyObject> others = null;
int count = (_activeDevices != null) ? _activeDevices.Count : 0;
if (count > 0)
{
others = new List <DependencyObject>(count);
}
for (int i = 0; i < count; i++)
{
TouchDevice touchDevice = _activeDevices[i];
if (touchDevice != this)
{
DependencyObject other = capture ? (touchDevice._captured as DependencyObject) : (touchDevice._directlyOver as DependencyObject);
if (other != null)
{
others.Add(other);
}
}
}
ReverseInheritProperty property = capture ? (ReverseInheritProperty)UIElement.TouchesCapturedWithinProperty : (ReverseInheritProperty)UIElement.TouchesOverProperty;
DeferredElementTreeState treeState = capture ? _capturedWithinTreeState : _directlyOverTreeState;
Action <DependencyObject, bool> originChangedAction = capture ? null : RaiseTouchEnterOrLeaveAction;
property.OnOriginValueChanged(oldElement as DependencyObject, newElement as DependencyObject, others, ref treeState, originChangedAction);
if (capture)
{
_capturedWithinTreeState = treeState;
}
else
{
_directlyOverTreeState = treeState;
}
}
/// <summary>
/// Determines if we can remain focused on the element we think has focus
/// </summary>
/// <remarks>
/// Invoked asynchronously by ReevaluateFocusAsync.
/// Confirms that the element we think has focus is:
/// - still enabled
/// - still visible
/// - still in the tree
/// </remarks>
private object ReevaluateFocusCallback(object arg)
{
_reevaluateFocusOperation = null;
if (_focus == null)
{
return(null);
}
//
// Reevaluate the eligability of the focused element to actually
// have focus. If that element is no longer focusable, then search
// for an ancestor that is.
//
DependencyObject element = _focus;
while (element != null)
{
if (Keyboard.IsFocusable(element))
{
break;
}
// Walk the current tree structure.
element = DeferredElementTreeState.GetCoreParent(element, null);
}
// Get the PresentationSource that contains the element to be focused.
PresentationSource presentationSource = null;
DependencyObject visualContainer = InputElement.GetContainingVisual(element);
if (visualContainer != null)
{
presentationSource = PresentationSource.CriticalFromVisual(visualContainer);
}
// The default action is to reset focus to the root element
// of the active presentation source.
bool moveFocus = true;
DependencyObject moveFocusTo = null;
if (presentationSource != null)
{
IKeyboardInputProvider keyboardProvider = presentationSource.GetInputProvider(typeof(KeyboardDevice)) as IKeyboardInputProvider;
if (keyboardProvider != null)
{
// Confirm with the keyboard provider for this
// presentation source that it has acquired focus.
if (keyboardProvider.AcquireFocus(true))
{
if (element == _focus)
{
// The focus element is still good.
moveFocus = false;
}
else
{
// The focus element is no longer focusable, but we found
// an ancestor that is, so move focus there.
moveFocus = true;
moveFocusTo = element;
}
}
}
}
if (moveFocus)
{
if (moveFocusTo == null && _activeSource != null)
{
moveFocusTo = _activeSource.Value.RootVisual as DependencyObject;
}
Focus(moveFocusTo, /*askOld=*/ false, /*askNew=*/ true, /*forceToNullIfFailed=*/ true);
}
else
{
// Refresh FocusWithinProperty so that ReverseInherited Flags are updated.
//
// We only need to do this if there is any information about the old
// tree structure.
if (_focusTreeState != null && !_focusTreeState.IsEmpty)
{
UIElement.FocusWithinProperty.OnOriginValueChanged(_focus, _focus, ref _focusTreeState);
}
}
return(null);
}
internal void OnOriginValueChanged(DependencyObject oldOrigin, DependencyObject newOrigin, ref DeferredElementTreeState oldTreeState)
{
OnOriginValueChanged(oldOrigin, newOrigin, null, ref oldTreeState, null);
}
private void FirePropertyChangeInAncestry(DependencyObject element,
bool oldValue,
DeferredElementTreeState treeState,
Action <DependencyObject, bool> originChangedAction)
{
UIElement uie;
ContentElement ce;
UIElement3D uie3D;
CastElement(element, out uie, out ce, out uie3D);
bool flagChanged = IsFlagSet(uie, ce, uie3D, FlagChanged);
bool isFlagOldOriginCacheSet = ((FlagOldOriginCache == CoreFlags.None) ? false : IsFlagSet(uie, ce, uie3D, FlagOldOriginCache));
bool isFlagNewOriginCacheSet = ((FlagNewOriginCache == CoreFlags.None) ? false : IsFlagSet(uie, ce, uie3D, FlagNewOriginCache));
if (flagChanged || isFlagOldOriginCacheSet || isFlagNewOriginCacheSet)
{
if (flagChanged)
{
// if FlagChanged bit is set, then the value has changed effectively
// after considering all the origins. Hence change the property value
// and fire notifications.
SetFlag(uie, ce, uie3D, FlagChanged, false);
if (oldValue)
{
element.ClearValue(FlagKey);
}
else
{
element.SetValue(FlagKey, true);
}
FireNotifications(uie, ce, uie3D, oldValue);
}
if (isFlagOldOriginCacheSet || isFlagNewOriginCacheSet)
{
SetFlag(uie, ce, uie3D, FlagOldOriginCache, false);
SetFlag(uie, ce, uie3D, FlagNewOriginCache, false);
if (isFlagOldOriginCacheSet != isFlagNewOriginCacheSet)
{
// if either FlagOldOriginCache or FlagNewOriginCache
// are set, then the origin change has affected this node
// and hence originChangedAction should be executed.
Debug.Assert(originChangedAction != null);
originChangedAction(element, oldValue);
}
}
// Check for block reverse inheritance flag, elements like popup want to set this.
if (BlockReverseInheritance(uie, ce, uie3D))
{
return;
}
// Call FirePropertyChange up the visual and logical trees.
// Note our minimal optimization check to avoid walking both
// the core and logical parents if they are the same.
{
DependencyObject coreParent = DeferredElementTreeState.GetInputElementParent(element, treeState);
DependencyObject logicalParent = DeferredElementTreeState.GetLogicalParent(element, treeState);
if (coreParent != null)
{
FirePropertyChangeInAncestry(coreParent, oldValue, treeState, originChangedAction);
}
if (logicalParent != null && logicalParent != coreParent)
{
FirePropertyChangeInAncestry(logicalParent, oldValue, treeState, originChangedAction);
}
}
}
}
