/// <summary>
/// Binds a <see cref="AvaloniaProperty"/> to an observable.
/// </summary>
/// <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 IDisposable Bind(
AvaloniaProperty property,
IObservable <object> source,
BindingPriority priority = BindingPriority.LocalValue)
{
Contract.Requires <ArgumentNullException>(property != null);
Contract.Requires <ArgumentNullException>(source != null);
VerifyAccess();
var description = GetDescription(source);
if (property.IsDirect)
{
if (property.IsReadOnly)
{
throw new ArgumentException($"The property {property.Name} is readonly.");
}
Logger.Verbose(
LogArea.Property,
this,
"Bound {Property} to {Binding} with priority LocalValue",
property,
description);
if (_directBindings == null)
{
_directBindings = new List <DirectBindingSubscription>();
}
return(new DirectBindingSubscription(this, property, source));
}
else
{
Logger.Verbose(
LogArea.Property,
this,
"Bound {Property} to {Binding} with priority {Priority}",
property,
description,
priority);
if (_values == null)
{
_values = new ValueStore(this);
}
return(_values.AddBinding(property, source, priority));
}
}
/// <summary>
/// Sets the value of a styled property.
/// </summary>
/// <param name="property">The property.</param>
/// <param name="value">The value.</param>
/// <param name="priority">The priority of the value.</param>
private void SetStyledValue(AvaloniaProperty property, object value, BindingPriority priority)
{
var notification = value as BindingNotification;
// We currently accept BindingNotifications for non-direct properties but we just
// strip them to their underlying value.
if (notification != null)
{
if (!notification.HasValue)
{
return;
}
else
{
value = notification.Value;
}
}
var originalValue = value;
if (!TypeUtilities.TryConvertImplicit(property.PropertyType, value, out value))
{
throw new ArgumentException(string.Format(
"Invalid value for Property '{0}': '{1}' ({2})",
property.Name,
originalValue,
originalValue?.GetType().FullName ?? "(null)"));
}
if (_values == null)
{
_values = new ValueStore(this);
}
LogPropertySet(property, value, priority);
_values.AddValue(property, value, (int)priority);
}