private static void UnattachDataContext(Control control, object dataContext, RelayInfoCollection collection)
{
for (int i = 0; i < control.InputBindings.Count; i++)
{
if (control.InputBindings[i] is RelayInfoCommandBinding binding)
{
control.InputBindings.RemoveAt(i--);
}
}
}
private static void OnControlDataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
{
Control control = (Control)sender;
// If not attached, do nothing
RelayInfoCollection collection = GetCollection(control);
if (collection == null)
{
return;
}
if (e.OldValue != null)
{
UnattachDataContext(control, e.OldValue, collection);
}
if (e.NewValue != null)
{
AttachDataContext(control, e.NewValue, collection);
}
}
private static void AttachDataContext(Control control, object dataContext, RelayInfoCollection collection)
{
Type dataType = dataContext.GetType();
foreach (RelayInfo info in collection)
{
PropertyInfo prop = dataType.GetProperty(info.Name);
if (prop == null)
{
throw new ArgumentNullException($"No property found with the name \"{info.Name}\"!");
}
//if (!typeof(ICommand).IsAssignableFrom(prop.PropertyType))
// throw new ArgumentNullException($"Property \"{info.Name}\" is not a type of {nameof(ICommand)}!");
IRelayInfoCommand command = (IRelayInfoCommand)prop.GetValue(dataContext);
command.Info = info;
if (command.InputGesture != null)
{
control.InputBindings.Add(new RelayInfoCommandBinding(command));
}
}
}
public static void SetCollection(DependencyObject d, RelayInfoCollection value)
{
d.SetValue(CollectionProperty, value);
}