private CommandSubscription GetOrCreateSubscription(UIElement element)
{
CommandSubscription subscription = null;
if( !_subscriptions.ContainsKey(element) )
{
subscription = new CommandSubscription(element);
_subscriptions[element] = subscription;
} else
{
subscription = _subscriptions[element];
}
return subscription;
}
private void HookupExecuteEvent(CommandSubscription subscription)
{
if( subscription.UIElement is ButtonBase )
{
HookupExecuteEventForButtonBase(subscription);
} else if( subscription.UIElement is TextBox )
{
HookupExecuteEventForTextBox(subscription);
} else if( subscription.UIElement is ICanExecuteCommand )
{
HookupExecuteEventForRoutedCommand(subscription);
} else
{
HookupExceuteEventForLeftMouseButtonUp(subscription);
}
}
private void HookupExecuteEventForTextBox(CommandSubscription subscription)
{
var textBox = subscription.UIElement as TextBox;
textBox.TextChanged += (s, e) => subscription.Execute();
}
private void HookupExecuteEventForRoutedCommand(CommandSubscription subscription)
{
var routedCommand = subscription.UIElement as ICanExecuteCommand;
routedCommand.Command += (s, e) => subscription.Execute();
}
private void HookupExecuteEventForButtonBase(CommandSubscription subscription)
{
var button = subscription.UIElement as ButtonBase;
button.Click += (s,e) => subscription.Execute();
}
private void HookupExceuteEventForLeftMouseButtonUp(CommandSubscription subscription)
{
subscription.UIElement.MouseLeftButtonDown += (s, e) => subscription.Execute();
}
private void HookUpCanExecuteEvent(CommandSubscription subscription)
{
subscription.Command.CanExecuteChanged +=
(s, e) => SetCanExecute(subscription);
}
private void SetCanExecute(CommandSubscription subscription)
{
subscription.UIElement.Dispatcher.BeginInvoke(
() =>
{
if (subscription.UIElement is Control)
{
((Control) subscription.UIElement).IsEnabled = subscription.Command.CanExecute(subscription.CommandParameter);
}
else if (subscription.UIElement is ICanBeEnabled)
{
((ICanBeEnabled) subscription.UIElement).IsEnabled =
subscription.Command.CanExecute(subscription.CommandParameter);
}
});
}
