private void ReturnListener()
{
this.listener.Changed -= this.HandleValueChanged;
freeListeners.Add(this.listener);
this.listener = null;
}
private void Attach()
{
this.Detach();
if (this.target != null && this.binding != null)
{
this.listener = this.GetListener();
this.listener.Attach(this.target, this.binding);
}
}
public void ListenerChangedIsRaisedWhenDataContextPropertyChanges()
{
var myObject = new MyClass {Value = "Initial"};
var binding = new Binding("Value");
var element = new TextBlock {DataContext = myObject};
var currentState = string.Empty;
var listener = new DependencyPropertyListener();
listener.Changed += ((s, e) => currentState = (string) e.EventArgs.NewValue);
listener.Attach(element, binding);
var initialState = currentState;
myObject.Value = "NewValue";
var finalState = currentState;
Assert.AreEqual("Initial", initialState);
Assert.AreEqual("NewValue", finalState);
}
private DependencyPropertyListener GetListener()
{
DependencyPropertyListener dependencyPropertyListener;
if (freeListeners.Count != 0)
{
dependencyPropertyListener = freeListeners[freeListeners.Count - 1];
freeListeners.RemoveAt(freeListeners.Count - 1);
return(dependencyPropertyListener);
}
else
{
dependencyPropertyListener = new DependencyPropertyListener();
}
dependencyPropertyListener.Changed += this.HandleValueChanged;
return(dependencyPropertyListener);
}
private void Attach()
{
this.Detach();
if (this.target != null && this.binding != null)
{
this.listener = this.GetListener();
this.listener.Attach(this.target, this.binding);
}
}
private void ReturnListener()
{
this.listener.Changed -= this.HandleValueChanged;
freeListeners.Add(this.listener);
this.listener = null;
}
private DependencyPropertyListener GetListener()
{
DependencyPropertyListener dependencyPropertyListener;
if (freeListeners.Count != 0)
{
dependencyPropertyListener = freeListeners[freeListeners.Count - 1];
freeListeners.RemoveAt(freeListeners.Count - 1);
return dependencyPropertyListener;
}
else
{
dependencyPropertyListener = new DependencyPropertyListener();
}
dependencyPropertyListener.Changed += this.HandleValueChanged;
return dependencyPropertyListener;
}
