public void PropertyChangedTest()
{
DocumentDataModel model = new DocumentDataModel();
string[] watchedProperties = new string[] { "HasUnsavedData", "HasUndoData", "HasRedoData", "DocumentRoot", "ObservableDocumentRoot" };
Dictionary <string, object> propertyValues = new Dictionary <string, object>();
HashSet <string> changedProperties = new HashSet <string>();
PropertyChangedEventHandler propChangedHandler = delegate(object sender, PropertyChangedEventArgs e)
{
Assert.AreSame(model, sender);
changedProperties.Add(e.PropertyName);
};
ZeroArgDelegate prepare = delegate()
{
// Note old property values for later comparison.
foreach (string prop in watchedProperties)
{
propertyValues[prop] = model.GetType().GetProperty(prop).GetValue(model, null);
}
changedProperties.Clear();
};
ZeroArgDelegate verify = delegate()
{
// Verify that properties are unchanged, or that we were notified that they changed.
foreach (string prop in watchedProperties)
{
if (changedProperties.Contains(prop))
{
continue; // We were notified of a change.
}
object oldValue = propertyValues[prop];
object newValue = model.GetType().GetProperty(prop).GetValue(model, null);
Assert.AreEqual(oldValue, newValue,
"Property {0} changed without notification, from '{1}' to '{2}'",
prop, oldValue, newValue);
}
DocumentDataModelInvariant(model);
};
model.PropertyChanged += propChangedHandler;
prepare();
model.New(new Size(100, 100), new Thickness(20));
verify();
// New should trigger updates on both DocumentRoot properties.
Assert.IsTrue(changedProperties.Contains("DocumentRoot"));
Assert.IsTrue(changedProperties.Contains("ObservableDocumentRoot"));
prepare();
model.AddShape(new XElement("Test"));
verify();
// A "deep" change of the document XML must not trigger updates on DocumentRoot, but only on ObservableDocumentRoot
Assert.IsFalse(changedProperties.Contains("DocumentRoot"));
Assert.IsTrue(changedProperties.Contains("ObservableDocumentRoot"));
prepare();
model.Undo();
verify();
// Undo should trigger updates on both DocumentRoot properties.
Assert.IsTrue(changedProperties.Contains("DocumentRoot"));
Assert.IsTrue(changedProperties.Contains("ObservableDocumentRoot"));
prepare();
model.Redo();
verify();
// Redo should trigger updates on both DocumentRoot properties.
Assert.IsTrue(changedProperties.Contains("DocumentRoot"));
Assert.IsTrue(changedProperties.Contains("ObservableDocumentRoot"));
prepare();
((XElement)model.DocumentRoot.FirstNode).Name = "Test2";
verify();
// A "deep" change of the document XML must not trigger updates on DocumentRoot, but only on ObservableDocumentRoot
Assert.IsFalse(changedProperties.Contains("DocumentRoot"));
Assert.IsTrue(changedProperties.Contains("ObservableDocumentRoot"));
// If we remove the handler, we should not get any notifications. :-)
model.PropertyChanged -= propChangedHandler;
prepare();
model.Undo();
Assert.AreEqual(0, changedProperties.Count); // No changes that we know of.
}