private void OnScopeKeyboardFocusChanged(UIElement focusScope, int priority)
{
switch (this.ActivateBehavior)
{
case FocusScopeManagerActivateBehavior.ClearFocusedElementInLowerPriorityScopes:
if (focusScope == this.ActiveManagedFocusScope)
{
break;
}
int indexForPriority = this.FindStartIndexForPriority(priority);
if (!this.IsFocusScopeManaged(focusScope, priority, indexForPriority))
{
break;
}
for (int index = indexForPriority; index < this.scopes.Count; ++index)
{
WeakReference weakReference = this.scopes[index];
if (weakReference.IsAlive)
{
UIElement uiElement = (UIElement)weakReference.Target;
if (uiElement != focusScope)
{
FocusManager.SetFocusedElement((DependencyObject)uiElement, (IInputElement)null);
}
}
else
{
this.listContainsDeadReferences = true;
}
}
this.CleanUpDeadReferences();
this.ActiveManagedFocusScope = focusScope;
break;
case FocusScopeManagerActivateBehavior.UpdateFocusedElementInAncestorFocusScopes:
DependencyObject element = (DependencyObject)focusScope;
while (true)
{
DependencyObject parentFocusScope = FocusScopeManager.GetParentFocusScope(element);
if (parentFocusScope != null)
{
FocusManager.SetFocusedElement(parentFocusScope, (IInputElement)element);
element = parentFocusScope;
}
else
{
break;
}
}
break;
}
}
public static void SetFocusToFocusScope(IInputElement newFocus)
{
UIElement uiElement = newFocus as UIElement;
if (uiElement == null)
{
return;
}
UIElement focusScope = FocusManager.GetFocusScope((DependencyObject)uiElement) as UIElement;
int focusScopePriority = FocusScopeManager.GetFocusScopePriority((DependencyObject)focusScope);
if (focusScopePriority == FocusScopeManager.DefaultFocusScopePriority)
{
return;
}
FocusScopeManager.Instance.OnScopeKeyboardFocusChanged(focusScope, focusScopePriority);
}
private object CoerceFocusedElement(object newFocus)
{
UIElement uiElement = newFocus as UIElement;
if (uiElement != null)
{
if (this.ShouldDenyFocusChange)
{
this.EndDenyNextFocusChange();
return(DependencyProperty.UnsetValue);
}
if (newFocus != null && !FocusScopeManager.GetAllowedFocus((DependencyObject)uiElement))
{
return(DependencyProperty.UnsetValue);
}
}
return(newFocus);
}
private bool IsFocusScopeManaged(UIElement focusScope, int priority, int priorityStartIndex)
{
for (int index = priorityStartIndex; index < this.scopes.Count; ++index)
{
WeakReference weakReference = this.scopes[index];
if (weakReference.IsAlive)
{
UIElement uiElement = (UIElement)weakReference.Target;
if (FocusScopeManager.GetFocusScopePriority((DependencyObject)uiElement) > priority)
{
return(false);
}
if (uiElement == focusScope)
{
return(true);
}
}
}
return(false);
}
private int FindStartIndexForPriority(int priority)
{
int index;
for (index = 0; index < this.scopes.Count; ++index)
{
WeakReference weakReference = this.scopes[index];
if (weakReference.IsAlive)
{
if (FocusScopeManager.GetFocusScopePriority((DependencyObject)weakReference.Target) >= priority)
{
break;
}
}
else
{
this.listContainsDeadReferences = true;
}
}
return(index);
}
internal static void HandlePreviewGotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
{
DependencyObject element = e.NewFocus as DependencyObject;
Visual visual = element as Visual;
if (FocusScopeManager.Instance.ShouldDenyFocusChange)
{
FocusScopeManager.Instance.EndDenyNextFocusChange();
if (!(visual is ExpressionFloatingWindow))
{
e.Handled = true;
return;
}
}
if (element == null || FocusScopeManager.GetAllowedFocus(element))
{
return;
}
FocusScopeManager.Instance.ReturnFocus();
e.Handled = true;
}
private static void HandleGotKeyboardFocusEvent(object sender, KeyboardFocusChangedEventArgs e)
{
FocusScopeManager.SetFocusToFocusScope(e.NewFocus);
}