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 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);
}
}
}
}