/// <summary>
/// Watches the specified source.
/// </summary>
/// <param name="source">
/// The source.
/// </param>
/// <param name="property">
/// The property.
/// </param>
/// <returns>
/// The <see cref="WeakCommandBinding"/>.
/// </returns>
/// <exception cref="System.ArgumentNullException">
/// The source can not be null.
/// </exception>
public WeakCommandBinding Watch(object source, string property)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
var bindContext = new BindContext(source, property);
var entry = new WeakEntry(null, bindContext.Source, property);
WeakEvent watchEvent;
if (this.watchEvents.ContainsKey(entry))
{
watchEvent = this.watchEvents[entry];
}
else
{
watchEvent = new WeakEvent(this);
this.watchEvents.Add(entry, watchEvent);
}
string propertyName = property.Contains(".") ? property.Right(".") : property;
watchEvent.AttachEvent(
bindContext,
WeakPropertyBinding.PropertyChangedEventName,
WatchEventCallbackMethod,
(o, args) => string.Equals(((PropertyChangedEventArgs)args).PropertyName, propertyName));
this.RaiseCanExecuteChanged();
return(this);
}
public void Test_WeakEntry_Equals()
{
var viewModel = new TestViewModel();
var viewModel2 = new TestViewModel();
var weakEntry = new WeakEntry("Text1", viewModel, "Name");
var weakEntry1 = new WeakEntry("Text1", viewModel2, "Name");
var weakEntry2 = new WeakEntry("Text2", viewModel, "Name");
var weakEntry3 = new WeakEntry("Text1", viewModel, "Age");
var weakEntry4 = new WeakEntry("Text1", viewModel, "Name");
var weakEntry5 = new WeakEntry(string.Empty, viewModel, "Name");
var weakEntry6 = new WeakEntry("Text2", viewModel, string.Empty);
Assert.IsFalse(weakEntry.Equals(weakEntry1));
Assert.IsFalse(weakEntry.Equals(weakEntry2));
Assert.IsFalse(weakEntry.Equals(weakEntry3));
Assert.IsFalse(weakEntry1.Equals(weakEntry2));
Assert.IsFalse(weakEntry1.Equals(weakEntry3));
Assert.IsFalse(weakEntry2.Equals(weakEntry5));
Assert.IsFalse(weakEntry2.Equals(weakEntry6));
Assert.IsTrue(weakEntry1 != weakEntry3);
Assert.IsTrue(weakEntry.Equals(weakEntry4));
Assert.IsTrue(weakEntry == weakEntry4);
}
/// <summary>
/// Sets the binding.
/// </summary>
/// <typeparam name="T">
/// The concrete <see cref="WeakBinding"/> to return.
/// </typeparam>
/// <param name="targetProperty">
/// The target property.
/// </param>
/// <param name="source">
/// The source.
/// </param>
/// <param name="sourceProperty">
/// The source property.
/// </param>
/// <param name="activate">
/// if set to <c>true</c> activate.
/// </param>
/// <returns>
/// The <see cref="T"/>.
/// </returns>
/// <exception cref="System.NotSupportedException">
/// The new binding is not compatible with the existing binding.
/// </exception>
public T SetBinding <T>(string targetProperty, object source, string sourceProperty, bool activate = true)
where T : WeakBinding
{
var entry = new WeakEntry(targetProperty, source, sourceProperty);
WeakBinding binding;
if (this.bindings.ContainsKey(entry))
{
binding = this.bindings[entry];
if (typeof(T) != binding.GetType())
{
throw new NotSupportedException(
string.Format(
"The new {0} is not compatible with the existing {1}, ",
typeof(T),
binding.GetType())
+ "please clear the binding and rebind or update WeakTarget.SetBinding method to clear the existing binding first");
}
binding.Update(targetProperty, source, sourceProperty);
}
else
{
binding = DynamicEngine.CreateInstance <T>(this.Target, targetProperty, source, sourceProperty);
binding.Initialize <T>(activate);
this.bindings.Add(entry, binding);
}
return(binding as T);
}
/// <summary>
/// Clears the binding.
/// </summary>
/// <param name="targetProperty">
/// The target property.
/// </param>
/// <param name="source">
/// The source.
/// </param>
/// <param name="sourceProperty">
/// The source property.
/// </param>
public void ClearBinding(string targetProperty, object source, string sourceProperty)
{
var entry = new WeakEntry(targetProperty, source, sourceProperty);
if (this.bindings.ContainsKey(entry))
{
this.bindings[entry].Clear();
this.bindings.Remove(entry);
}
}
/// <summary>
/// Get the binding.
/// </summary>
/// <typeparam name="T">
/// The concrete <see cref="WeakBinding"/> to return.
/// </typeparam>
/// <param name="targetProperty">
/// The target property.
/// </param>
/// <param name="source">
/// The source.
/// </param>
/// <param name="sourceProperty">
/// The source property.
/// </param>
/// <returns>
/// The <see cref="T"/>.
/// </returns>
public T GetBinding <T>(string targetProperty, object source, string sourceProperty)
where T : WeakBinding
{
var entry = new WeakEntry(targetProperty, source, sourceProperty);
if (this.bindings.ContainsKey(entry))
{
return(this.bindings[entry] as T);
}
return(null);
}
/// <summary>
/// UnWatch the source property.
/// </summary>
/// <param name="source">
/// The source.
/// </param>
/// <param name="property">
/// The property.
/// </param>
/// <returns>
/// The <see cref="WeakCommandBinding"/>.
/// </returns>
/// <exception cref="System.ArgumentNullException">
/// The source can not be null.
/// </exception>
public WeakCommandBinding UnWatch(object source, string property)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
var bindSource = new BindContext(source, property);
var entry = new WeakEntry(null, bindSource.Source, property);
if (this.watchEvents.ContainsKey(entry))
{
WeakEvent watchEvent = this.watchEvents[entry];
watchEvent.DetachEvent();
this.watchEvents.Remove(entry);
}
this.RaiseCanExecuteChanged();
return(this);
}
