public void ShouldCallValueChangedCallbackWhenDataContextChanges()
{
var dataContext = new NotifyingDataContext {
Property = "OldPropertyValue"
};
var target = new FrameworkElement();
target.DataContext = dataContext;
var adapter = new DataContextPropertyAdapter(target, "Property");
bool callbackWasCalled = false;
object newDataContextPropertyValue = null;
adapter.ValueChangedCallback =
newValue =>
{
callbackWasCalled = true;
newDataContextPropertyValue = newValue;
};
target.DataContext = new DataContext {
Property = "OtherPropertyValue"
};
Assert.IsTrue(callbackWasCalled);
Assert.AreEqual("OtherPropertyValue", newDataContextPropertyValue);
}
public void ShouldDoNothingWhenSettingPropertyToNullDataContext()
{
var target = new FrameworkElement();
target.DataContext = null;
var adapter = new DataContextPropertyAdapter(target, "Property");
adapter.SetValue("AnotherPropertyValue");
}
public void ShouldGetNoValueWhenDataContextIsNull()
{
var target = new FrameworkElement();
target.DataContext = null;
var adapter = new DataContextPropertyAdapter(target, "Property");
var value = adapter.GetValue();
Assert.AreSame(SettingsConstants.NoValue, value);
}
public void ShouldGetValueFromDataContextProperty()
{
var target = new FrameworkElement();
target.DataContext = new DataContext {
Property = "PropertyValue"
};
var adapter = new DataContextPropertyAdapter(target, "Property");
var value = adapter.GetValue();
Assert.AreEqual("PropertyValue", value);
}
public void ShouldSetValueToDataContextProperty()
{
var dataContext = new DataContext {
Property = "OldPropertyValue"
};
var target = new FrameworkElement();
target.DataContext = dataContext;
var adapter = new DataContextPropertyAdapter(target, "Property");
adapter.SetValue("NewPropertyValue");
Assert.AreEqual("NewPropertyValue", dataContext.Property);
}
public IEnumerable <ISettingBinding> ProvideBindings(DependencyObject target)
{
var builder = new ValueBindingBuilder();
var @namespace = Settings.GetNamespace(target);
var accessor = Settings.CurrentStoreAccessor;
var targetAdapter = new DataContextPropertyAdapter((FrameworkElement)target, Property);
var exceptionHandler = new DebugValueAdapterExceptionHandler(Property, target, Store, Setting, @namespace);
var binding = builder
.SetTargetAdapter(targetAdapter)
.SetSourceAdapter(accessor, Store, @namespace, Setting)
.SetExceptionHandler(exceptionHandler.LogAndSwallowException)
.Build();
return(new[] { binding });
}
public void ShouldNotSetValueToPropertyOfOldDataContextAfterItChanges()
{
var target = new FrameworkElement();
var dataContext = new DataContext {
Property = "PropertyValue"
};
target.DataContext = dataContext;
var adapter = new DataContextPropertyAdapter(target, "Property");
target.DataContext = new DataContext {
Property = "OtherPropertyValue"
};
adapter.SetValue("AnotherPropertyValue");
Assert.AreEqual("PropertyValue", dataContext.Property);
}
