protected override void UpdateCanExecute()
{
if (Command != null)
{
CanExecute = GameCommand.CanExecuteCommandSource(this);
}
else
{
CanExecute = true;
}
var checkableParameter = CommandParameter as ICheckableCommandParameter;
if ((checkableParameter == null) || !checkableParameter.Handled)
{
return;
}
IsChecked = checkableParameter.IsChecked;
checkableParameter.Handled = false;
}
protected override void UpdateCanExecute()
{
var commandCanExecute = Command == null || Command == ApplicationCommands.NotACommand || GameCommand.CanExecuteCommandSource(this);
CanExecute = commandCanExecute && (!AutoDisableWhenPopupContentIsDisabled || (PopupControlService.IsPopupAnchorPopupEnabled(this)));
}
private static bool IsPopupAnchorPopupEnabledRecursive(UIElement element, ref bool isEnabled)
{
var validControlFound = false;
// Check for an items control
var itemsControl = element as ItemsControl;
if (itemsControl != null)
{
for (var index = 0; index < itemsControl.Items.Count; index++)
{
var childElement = itemsControl.Items[index] as UIElement ??
itemsControl.ItemContainerGenerator.ContainerFromIndex(index) as UIElement;
if (childElement == null)
{
continue;
}
var gameControl = childElement as IGameControl;
if (gameControl == null)
{
continue;
}
if (gameControl.Command != null)
{
// If using ItemsSource, the visual tree may not yet be built so force the parent element as the target
if (VisualTreeHelper.GetParent(childElement) == null)
{
isEnabled = GameCommand.CanExecuteCommandSource(gameControl, element);
}
else
{
isEnabled = GameCommand.CanExecuteCommandSource(gameControl);
}
}
else
{
isEnabled = childElement.IsEnabled;
}
validControlFound = true;
if (isEnabled)
{
return(true);
}
}
}
var children = LogicalTreeHelper.GetChildren(element);
foreach (var child in children)
{
var childElement = child as UIElement;
if (childElement == null)
{
continue;
}
var gameControl = childElement as IGameControl;
if (gameControl != null)
{
if (gameControl.Command != null)
{
isEnabled = GameCommand.CanExecuteCommandSource(gameControl);
}
else
{
isEnabled = childElement.IsEnabled;
}
validControlFound = true;
if (isEnabled)
{
return(true);
}
}
if ((childElement is IGamePopupAnchor))
{
continue;
}
// Recurse and quit afterwards if an enabled
validControlFound |= IsPopupAnchorPopupEnabledRecursive(childElement, ref isEnabled);
if (isEnabled)
{
return(validControlFound);
}
}
return(validControlFound);
}