/// <summary>
/// Sets the value of a direct property.
/// </summary>
/// <param name="property">The property.</param>
/// <param name="value">The value.</param>
private void SetDirectValueUnchecked <T>(DirectPropertyBase <T> property, BindingValue <T> value)
{
var p = AvaloniaPropertyRegistry.Instance.FindRegisteredDirect(this, property);
if (p == null)
{
throw new ArgumentException($"Property '{property.Name} not registered on '{this.GetType()}");
}
LogIfError(property, value);
switch (value.Type)
{
case BindingValueType.UnsetValue:
case BindingValueType.BindingError:
var fallback = value.HasValue ? value : value.WithValue(property.GetUnsetValue(GetType()));
property.InvokeSetter(this, fallback);
break;
case BindingValueType.DataValidationError:
property.InvokeSetter(this, value);
break;
case BindingValueType.Value:
case BindingValueType.BindingErrorWithFallback:
case BindingValueType.DataValidationErrorWithFallback:
property.InvokeSetter(this, value);
break;
}
if (p.IsDataValidationEnabled)
{
UpdateDataValidation(property, value);
}
}
/// <summary>
/// Binds a <see cref="AvaloniaProperty"/> to an observable.
/// </summary>
/// <typeparam name="T">The type of the property.</typeparam>
/// <param name="property">The property.</param>
/// <param name="source">The observable.</param>
/// <returns>
/// A disposable which can be used to terminate the binding.
/// </returns>
public IDisposable Bind <T>(
DirectPropertyBase <T> property,
IObservable <BindingValue <T> > source)
{
property = property ?? throw new ArgumentNullException(nameof(property));
source = source ?? throw new ArgumentNullException(nameof(source));
VerifyAccess();
property = AvaloniaPropertyRegistry.Instance.GetRegisteredDirect(this, property);
if (property.IsReadOnly)
{
throw new ArgumentException($"The property {property.Name} is readonly.");
}
Logger.TryGet(LogEventLevel.Verbose)?.Log(
LogArea.Property,
this,
"Bound {Property} to {Binding} with priority LocalValue",
property,
GetDescription(source));
_directBindings ??= new List <IDisposable>();
return(new DirectBindingSubscription <T>(this, property, source));
}
/// <summary>
/// Initializes a new instance of the <see cref="DirectPropertyBase{TValue}"/> class.
/// </summary>
/// <param name="source">The property to copy.</param>
/// <param name="ownerType">The new owner type.</param>
/// <param name="metadata">Optional overridden metadata.</param>
protected DirectPropertyBase(
DirectPropertyBase <TValue> source,
Type ownerType,
AvaloniaPropertyMetadata metadata)
: base(source, ownerType, metadata)
{
}
/// <summary>
/// Gets a direct property as registered on an object.
/// </summary>
/// <param name="o">The object.</param>
/// <param name="property">The direct property.</param>
/// <returns>
/// The registered.
/// </returns>
public DirectPropertyBase <T> GetRegisteredDirect <T>(
IAvaloniaObject o,
DirectPropertyBase <T> property)
{
return(FindRegisteredDirect(o, property) ??
throw new ArgumentException($"Property '{property.Name} not registered on '{o.GetType()}"));
}
/// <summary>
/// Sets a <see cref="AvaloniaProperty"/> value.
/// </summary>
/// <typeparam name="T">The type of the property.</typeparam>
/// <param name="property">The property.</param>
/// <param name="value">The value.</param>
public void SetValue <T>(DirectPropertyBase <T> property, T value)
{
property = property ?? throw new ArgumentNullException(nameof(property));
VerifyAccess();
LogPropertySet(property, value, BindingPriority.LocalValue);
SetDirectValueUnchecked(property, value);
}
public T GetValue <T>(DirectPropertyBase <T> property)
{
property = property ?? throw new ArgumentNullException(nameof(property));
VerifyAccess();
var registered = AvaloniaPropertyRegistry.Instance.GetRegisteredDirect(this, property);
return(registered.InvokeGetter(this));
}
public void ClearValue <T>(DirectPropertyBase <T> property)
{
property = property ?? throw new ArgumentNullException(nameof(property));
VerifyAccess();
var p = AvaloniaPropertyRegistry.Instance.GetRegisteredDirect(this, property);
p.InvokeSetter(this, p.GetUnsetValue(GetType()));
}
/// <summary>
/// Initializes a new instance of the <see cref="AvaloniaProperty"/> class.
/// </summary>
/// <param name="source">The property to copy.</param>
/// <param name="getter">Gets the current value of the property.</param>
/// <param name="setter">Sets the value of the property. May be null.</param>
/// <param name="metadata">Optional overridden metadata.</param>
private DirectProperty(
DirectPropertyBase <TValue> source,
Func <TOwner, TValue> getter,
Action <TOwner, TValue>?setter,
DirectPropertyMetadata <TValue> metadata)
: base(source, typeof(TOwner), metadata)
{
Getter = getter ?? throw new ArgumentNullException(nameof(getter));
Setter = setter;
}
public DirectBindingSubscription(
AvaloniaObject owner,
DirectPropertyBase <T> property,
IObservable <BindingValue <T> > source)
{
_owner = owner;
_property = property;
_owner._directBindings.Add(this);
_subscription = source.Subscribe(this);
}
/// <summary>
/// Initializes a new instance of the <see cref="AvaloniaProperty"/> class.
/// </summary>
/// <param name="source">The property to copy.</param>
/// <param name="getter">Gets the current value of the property.</param>
/// <param name="setter">Sets the value of the property. May be null.</param>
/// <param name="metadata">Optional overridden metadata.</param>
private DirectProperty(
DirectPropertyBase <TValue> source,
Func <TOwner, TValue> getter,
Action <TOwner, TValue> setter,
DirectPropertyMetadata <TValue> metadata)
: base(source, typeof(TOwner), metadata)
{
Contract.Requires <ArgumentNullException>(getter != null);
Getter = getter;
Setter = setter;
}
/// <summary>
/// Sets the value of a direct property.
/// </summary>
/// <param name="property">The property.</param>
/// <param name="value">The value.</param>
private void SetDirectValueUnchecked <T>(DirectPropertyBase <T> property, T value)
{
var p = AvaloniaPropertyRegistry.Instance.GetRegisteredDirect(this, property);
if (value is UnsetValueType)
{
p.InvokeSetter(this, p.GetUnsetValue(GetType()));
}
else if (!(value is DoNothingType))
{
p.InvokeSetter(this, value);
}
}
/// <summary>
/// Binds a <see cref="AvaloniaProperty"/> to an observable.
/// </summary>
/// <typeparam name="T">The type of the property.</typeparam>
/// <param name="target">The object.</param>
/// <param name="property">The property.</param>
/// <param name="source">The observable.</param>
/// <param name="priority">The priority of the binding.</param>
/// <returns>
/// A disposable which can be used to terminate the binding.
/// </returns>
public static IDisposable Bind <T>(
this IAvaloniaObject target,
AvaloniaProperty <T> property,
IObservable <BindingValue <T> > source,
BindingPriority priority = BindingPriority.LocalValue)
{
target = target ?? throw new ArgumentNullException(nameof(target));
property = property ?? throw new ArgumentNullException(nameof(property));
source = source ?? throw new ArgumentNullException(nameof(source));
return(property switch
{
StyledPropertyBase <T> styled => target.Bind(styled, source, priority),
DirectPropertyBase <T> direct => target.Bind(direct, source),
_ => throw new NotSupportedException("Unsupported AvaloniaProperty type."),
});
/// <summary>
/// Finds a direct property as registered on an object.
/// </summary>
/// <param name="o">The object.</param>
/// <param name="property">The direct property.</param>
/// <returns>
/// The registered property or null if no matching property found.
/// </returns>
public DirectPropertyBase <T> FindRegisteredDirect <T>(
IAvaloniaObject o,
DirectPropertyBase <T> property)
{
if (property.Owner == o.GetType())
{
return(property);
}
foreach (var p in GetRegisteredDirect(o.GetType()))
{
if (p == property)
{
return((DirectPropertyBase <T>)p);
}
}
return(null);
}
/// <summary>
/// Finds a direct property as registered on an object.
/// </summary>
/// <param name="o">The object.</param>
/// <param name="property">The direct property.</param>
/// <returns>
/// The registered property or null if no matching property found.
/// </returns>
public DirectPropertyBase <T>?FindRegisteredDirect <T>(
IAvaloniaObject o,
DirectPropertyBase <T> property)
{
if (property.Owner == o.GetType())
{
return(property);
}
var registeredDirect = GetRegisteredDirect(o.GetType());
var registeredDirectCount = registeredDirect.Count;
for (var i = 0; i < registeredDirectCount; i++)
{
var p = registeredDirect[i];
if (p == property)
{
return((DirectPropertyBase <T>)p);
}
}
return(null);
}
