// We use the ItemStatus to convey read-only property selection status
protected override string GetItemStatusCore()
{
FrameworkElement selection = _control.Selection;
string status;
if (selection != null)
{
ISelectionStop selectionStop = PropertySelection.GetSelectionStop(selection);
status = selectionStop == null ? null : selectionStop.Description;
if (status == null)
{
status = string.Format(
CultureInfo.CurrentCulture,
Resources.PropertyEditing_SelectionStatus_Unknown,
selection.GetType().Name);
}
}
else
{
status = Resources.PropertyEditing_SelectionStatus_Empty;
}
return(status);
}
// <summary>
// Sets PropertySelection.SelectionStop property on the specified DependencyObject
// </summary>
// <param name="obj">DependencyObject to modify</param>
// <param name="value">New value of SelectionStop</param>
internal static void SetSelectionStop(DependencyObject obj, ISelectionStop value)
{
if (obj == null)
{
throw FxTrace.Exception.ArgumentNull("obj");
}
obj.SetValue(SelectionStopProperty, value);
}
// 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);
}
// Called when the UI object representing a SelectionStop gets clicked:
//
// * If this is a double-click and the SelectionStop can be expanded / collapsed,
// expand / collapse the SelectionStop
//
private static void OnSelectionStopDoubleClickTargetMouseDown(object sender, MouseButtonEventArgs e)
{
DependencyObject target = e.OriginalSource as DependencyObject;
if (target == null)
{
return;
}
if (e.ClickCount > 1)
{
FrameworkElement parentSelectionStopVisual = PropertySelection.FindParentSelectionStop <FrameworkElement>(target);
if (parentSelectionStopVisual != null)
{
ISelectionStop parentSelectionStop = PropertySelection.GetSelectionStop(parentSelectionStopVisual);
if (parentSelectionStop != null && parentSelectionStop.IsExpandable)
{
parentSelectionStop.IsExpanded = !parentSelectionStop.IsExpanded;
}
}
}
}
// Helper method that returns false if the given element is a collapsed SelectionStop,
// true otherwise.
//
private static bool IsExpanded(DependencyObject element)
{
ISelectionStop selectionStop = PropertySelection.GetSelectionStop(element);
return(selectionStop == null || selectionStop.IsExpanded);
}
