private bool SelectDefaultPropertyHelper(string defaultPropertyName, bool firstTime)
{
if (string.IsNullOrEmpty(defaultPropertyName))
{
return(false);
}
ModelCategoryEntry defaultPropertyCategory;
PropertyEntry defaultProperty = FindPropertyEntry(defaultPropertyName, out defaultPropertyCategory);
CategoryEditor defaultCategoryEditor = FindCategoryEditor(defaultProperty, defaultPropertyCategory);
UIElement element = null;
bool elementPendingGeneration = false;
// Try to look up the correct UIElement to select
//
if (defaultCategoryEditor != null)
{
element = FindCategoryEditorVisual(defaultCategoryEditor, defaultPropertyCategory, out elementPendingGeneration);
}
else if (defaultProperty != null)
{
element = FindPropertyEntryVisual(defaultProperty, defaultPropertyCategory, out elementPendingGeneration);
}
else if (this.Count > 0)
{
// Nothing found, so select the first selectable thing in the list
element = PropertySelection.FindNeighborSelectionStop <UIElement>(this, SearchDirection.Next);
elementPendingGeneration = false;
}
// If the UIElement was found, select it. Otherwise, if it should exist but it wasn't generated yet,
// wait until it is and try again.
//
if (element != null)
{
SelectAndFocus(element, StealFocusMode.OnlyIfCategoryListHasFocusWithin);
// Ensure that we are in Default SelectionMode because calling SelectAndFocus automatically switches us
// to Sticky mode
//
ResetSelectionMode();
}
else if (elementPendingGeneration && firstTime)
{
// Set the firstTime flag to false, to prevent any infinite loops should things go wrong
this.Dispatcher.BeginInvoke(
DispatcherPriority.Loaded,
new SelectDefaultPropertyHelperDelegate(SelectDefaultPropertyHelper),
defaultPropertyName,
false);
}
else if (elementPendingGeneration && !firstTime)
{
elementPendingGeneration = false;
}
return(element != null || elementPendingGeneration);
}
// Keyboard Navigation
protected override void OnKeyDown(KeyEventArgs e)
{
// Intercept Up, Down, Left, Right key strokes and use them to navigate around the
// the control
//
if (e.Key == Key.Left || e.Key == Key.Right || e.Key == Key.Up || e.Key == Key.Down)
{
if (_selection != null && !e.Handled)
{
if (object.Equals(
Keyboard.FocusedElement,
VisualTreeUtils.FindFocusableElement <FrameworkElement>(_selection)))
{
ISelectionStop selectionStop = PropertySelection.GetSelectionStop(_selection);
if (selectionStop != null)
{
if (selectionStop.IsExpandable)
{
if ((e.Key == Key.Right && !selectionStop.IsExpanded) ||
(e.Key == Key.Left && selectionStop.IsExpanded))
{
selectionStop.IsExpanded = !selectionStop.IsExpanded;
e.Handled = true;
}
}
}
if (!e.Handled)
{
SearchDirection direction = e.Key == Key.Up || e.Key == Key.Left ? SearchDirection.Previous : SearchDirection.Next;
FrameworkElement nextStop = PropertySelection.FindNeighborSelectionStop <FrameworkElement>(_selection, direction);
// If need to select something, select it
if (nextStop != null)
{
SelectAndFocus(nextStop, StealFocusMode.Always);
}
e.Handled = true;
}
}
}
}
base.OnKeyDown(e);
}