private static object CoerceLabelProperty(DependencyObject obj, object value)
{
if (value == null)
{
var control = obj as IGameControl;
if ((control != null) && (control.Command != null))
{
var commandUIProvider = GameCommandUIManager.GetUIProviderResolved(control.Command);
if (commandUIProvider != null)
{
return(commandUIProvider.Label);
}
}
}
return(value);
}
internal static void HookCommands(IGameControl control, ICommand oldCommand, ICommand newCommand)
{
var wasAttached = control.Flags.GetFlag(GameControlFlags.IsAttachedToCommandCanExecuteChanged);
if ((wasAttached) && (oldCommand != null))
{
control.Flags.SetFlag(GameControlFlags.IsAttachedToCommandCanExecuteChanged, false);
if (control.CommandCanExecuteHandler != null)
{
oldCommand.CanExecuteChanged -= control.CommandCanExecuteHandler;
control.CommandCanExecuteHandler = null;
}
}
if (!control.Flags.GetFlag(GameControlFlags.IsAttachedToCommandCanExecuteChanged) &&
(newCommand != null) &&
(control.CanUpdateCanExecuteWhenHidden || control.IsVisible))
{
control.Flags.SetFlag(GameControlFlags.IsAttachedToCommandCanExecuteChanged, true);
control.CommandCanExecuteHandler = new EventHandler(control.OnCanExecuteChanged);
newCommand.CanExecuteChanged += control.CommandCanExecuteHandler;
}
// If no change was made, don't bother updating the CanExecute since this was called by an IsVisible change
if (((oldCommand != newCommand) ||
!wasAttached ||
!control.Flags.GetFlag(GameControlFlags.IsAttachedToCommandCanExecuteChanged)))
{
control.UpdateCanExecute();
}
wasAttached = control.Flags.GetFlag(GameControlFlags.IsAttachedToCommandUIProvider);
if ((wasAttached) && (oldCommand != null))
{
var commandUIProvider = GameCommandUIManager.GetUIProviderResolved(oldCommand);
if (commandUIProvider != null)
{
control.Flags.SetFlag(GameControlFlags.IsAttachedToCommandUIProvider, false);
CommandUIProviderPropertyChangedRouter router;
if (_uiProviderPropertyChangedRouter.TryGetValue(commandUIProvider, out router))
{
router.Remove(control);
if (!router.HasLiveReferences)
{
commandUIProvider.PropertyChanged -= router.OnCommandUIProviderPropertyChanged;
_uiProviderPropertyChangedRouter.Remove(commandUIProvider);
}
}
}
}
if ((!control.Flags.GetFlag(GameControlFlags.IsAttachedToCommandUIProvider)) &&
(newCommand != null) &&
((control.CanUpdateCanExecuteWhenHidden) || (control.IsVisible)))
{
var commandUIProvider = GameCommandUIManager.GetUIProviderResolved(newCommand);
if (commandUIProvider != null)
{
control.Flags.SetFlag(GameControlFlags.IsAttachedToCommandUIProvider, true);
CommandUIProviderPropertyChangedRouter router;
if (!_uiProviderPropertyChangedRouter.TryGetValue(commandUIProvider, out router))
{
router = new CommandUIProviderPropertyChangedRouter();
commandUIProvider.PropertyChanged += router.OnCommandUIProviderPropertyChanged;
_uiProviderPropertyChangedRouter.Add(commandUIProvider, router);
}
router.Add(control);
}
}
// Update the UI based on the command
UpdateUIFromCommand(control);
}
