//监听依赖属性变化，调用属性变化方法
public static void Watch(this DependencyObject source, string dependencyPropertyName, PropertyChangedCallback callback)
{
if (dependencyPropertyName == null || source == null || callback == null)
{
throw new ArgumentNullException();
}
Binding binding = new Binding(dependencyPropertyName)
{
Source = source, Mode = BindingMode.OneWay
};
BindingSlave bs = new BindingSlave();
_bindings.Add(bs);
bs.PropertyChanged += (o, e) =>
{
callback(source, new DependencyPropertyChangedEventArgs());
};
BindingOperations.SetBinding(bs, BindingSlave.ValueProperty, binding);
}
/// <summary>
/// Creates the bindings.
/// </summary>
/// <param name="bindings">The bindings.</param>
public void CreateBindings(IList bindings)
{
if (bindings != null)
{
foreach (Binding binding in bindings)
{
var slave = new BindingSlave(this);
Children.Add(slave);
if (_nameScope != null && !string.IsNullOrEmpty(binding.ElementName))
{
var element = _nameScope.FindName(binding.ElementName);
binding.ElementName = null;
binding.Source = element;
}
binding.TargetNullValue = null;
binding.FallbackValue = null;
slave.SetBinding(BindingSlave.ValueProperty, binding);
}
}
}
private void SlaveValueChanged( BindingSlave slave )
{
TryUpdateBinding ();
}
/// <summary>
/// Creates the bindings.
/// </summary>
/// <param name="bindings">The bindings.</param>
public void CreateBindings( IList bindings )
{
if ( bindings != null )
{
foreach ( Binding binding in bindings )
{
var slave = new BindingSlave ( this );
Children.Add ( slave );
if ( _nameScope != null && !string.IsNullOrEmpty ( binding.ElementName ) )
{
var element = _nameScope.FindName ( binding.ElementName );
binding.ElementName = null;
binding.Source = element;
}
binding.TargetNullValue = null;
binding.FallbackValue = null;
slave.SetBinding ( BindingSlave.ValueProperty, binding );
}
}
}
private void SlaveValueChanged(BindingSlave slave)
{
TryUpdateBinding();
}
