/// <summary>
/// When overridden in a derived class, sets the value of the component to a different value.
/// </summary>
public override void SetValue(object component, object value)
{
var stringValue = value as string;
var settingsValue = value as BindingSettings;
// The setter will be called with a plain string value whenever the standard values editor is
// used to pick the TypeId. So we need to actually set that value on the binding instead.
if (stringValue != null)
{
// Note that the setting of the property TypeId automatically triggers a property changed
// that will cause the value to be serialized and saved :). Indeed,
// it will be calling the SetValue again, but this time with the entire binding settings
// so it will call the next code branch.
((BindingSettings)this.GetValue(component)).TypeId = stringValue;
}
else if (settingsValue != null)
{
// Someone is explicitly setting the entire binding value, so we have to serialize it straight.
SaveSettings(component, settings);
// If the previous value was non-null, then we'd be monitoring its property changes
// already, and we'd need to unsubscribe.
if (this.settings != null)
{
this.settings.PropertyChanged -= OnSettingsChanged;
}
// Store for reuse on GetValue, and attach to property changes for auto-save.
this.settings = settingsValue;
this.settings.PropertyChanged += OnSettingsChanged;
}
}
/// <summary>
/// When overridden in a derived class, gets the current value of the property on a component.
/// </summary>
public override object GetValue(object component)
{
// We cache the settings to avoid paying the serialization cost too often.
// Also, this allows us to track changes more consistently.
if (this.settings == null)
{
var json = base.GetValue(component) as string;
// We always initialize the value to some non-null object, which
// turns on the dropdown for type selection. If we don't, the
// dropdown never shows up.
if (string.IsNullOrWhiteSpace(json))
{
this.settings = new BindingSettings();
// Save the value right after instantiation, so that
// subsequent GetValue gets the same instance and
// does not re-create from scratch.
SetValue(component, settings);
}
else
{
// Deserialize always to the concrete type, as we the serializer needs to
// know the type of thing to create.
this.settings = BindingSerializer.Deserialize <BindingSettings>(json);
}
// Hookup property changed event, which supports nested changes as well. This
// allows us to automatically save the serialized json on every property change.
this.settings.PropertyChanged += OnSettingsChanged;
}
return(this.settings);
}
public void WhenPropertyAdded_ThenBindingRaisesChanged()
{
var binding = new BindingSettings();
var raised = false;
binding.PropertyChanged += (sender, args) => raised = true;
binding.Properties.Add(new PropertyBindingSettings());
Assert.True(raised);
}
public void WhenTypeIdChanged_ThenBindingRaisesChanged()
{
var binding = new BindingSettings();
var raised = false;
binding.PropertyChanged += (sender, args) => raised = true;
binding.TypeId = "foo";
Assert.True(raised);
}
private void SaveSettings(object component, BindingSettings settings)
{
if (!this.settings.IsConfigured())
{
base.SetValue(component, BindingSettings.Empty);
}
else
{
base.SetValue(component, BindingSerializer.Serialize(settings));
}
}
public void InitializeContext()
{
this.settings = new BindingSettings { TypeId = string.Empty };
this.component = "SomeComponent";
var innerDescriptor = new Mock<PropertyDescriptor>("foo", new Attribute[0]);
innerDescriptor.Setup(x => x.Name).Returns("Property");
innerDescriptor.Setup(x => x.Attributes).Returns(new AttributeCollection());
innerDescriptor.Setup(x => x.GetValue(this.component)).Returns(this.settings);
this.descriptor = new BindingPropertyDescriptor<IValueProvider>(innerDescriptor.Object, new Attribute[0]);
}
public void WhenPropertyValueProviderSet_ThenBindingRaisesChanged()
{
var binding = new BindingSettings();
var property = new PropertyBindingSettings();
var raised = false;
binding.Properties.Add(property);
binding.PropertyChanged += (sender, args) => raised = true;
property.ValueProvider = new ValueProviderBindingSettings();
Assert.True(raised);
}
public void WhenPropertyNameChanged_ThenBindingRaisesChanged()
{
var binding = new BindingSettings();
var property = new PropertyBindingSettings();
var raised = false;
binding.Properties.Add(property);
binding.PropertyChanged += (sender, args) => raised = true;
property.Name = "hello";
Assert.True(raised);
}
public void WhenRoundTrippingFullBinding_ThenSucceeds()
{
IBindingSettings binding = new BindingSettings
{
TypeId = "foo",
Properties =
{
new PropertyBindingSettings
{
Name = "Name",
Value = "Value",
ValueProvider = new ValueProviderBindingSettings
{
TypeId = "ValueProvider",
Properties =
{
new PropertyBindingSettings
{
Name = "Id",
Value = "1"
}
}
}
}
}
};
var serialized = BindingSerializer.Serialize(binding);
var deserialized = BindingSerializer.Deserialize<IBindingSettings>(serialized);
Assert.Equal(binding.TypeId, deserialized.TypeId);
Assert.Equal(binding.Properties.Count, deserialized.Properties.Count);
Assert.Equal(binding.Properties[0].Name, deserialized.Properties[0].Name);
Assert.Equal(binding.Properties[0].Value, deserialized.Properties[0].Value);
Assert.Equal(binding.Properties[0].ValueProvider.TypeId, deserialized.Properties[0].ValueProvider.TypeId);
Assert.Equal(binding.Properties[0].ValueProvider.Properties[0].Name, deserialized.Properties[0].ValueProvider.Properties[0].Name);
Assert.Equal(binding.Properties[0].ValueProvider.Properties[0].Value, deserialized.Properties[0].ValueProvider.Properties[0].Value);
}
public void WhenPropertyBindingHasValue_ThenBindingResolvesToFixedValue()
{
var settings = new BindingSettings
{
TypeId = "Foo",
Properties =
{
new PropertyBindingSettings
{
Name = Reflector<IFoo>.GetProperty(x => x.Message).Name,
Value = FixedValue,
ValueProvider = new ValueProviderBindingSettings
{
TypeId = "ValueProvider"
}
}
}
};
var binding = this.target.CreateBinding<IFoo>(settings);
Assert.True(binding.Evaluate());
Assert.Equal(FixedValue, binding.Value.Message);
}
public void WhenValueProviderTypeIdChanged_ThenBindingRaisesChanged()
{
var raised = false;
var provider = new ValueProviderBindingSettings();
var binding = new BindingSettings
{
Properties =
{
new PropertyBindingSettings
{
ValueProvider = provider,
}
}
};
binding.PropertyChanged += (sender, args) => raised = true;
provider.TypeId = "foo";
Assert.True(raised);
}
