/// <summary>
/// Initializes a new instance of the <see cref="PriorityLevel"/> class.
/// </summary>
/// <param name="owner">The owner.</param>
/// <param name="priority">The priority.</param>
public PriorityLevel(
PriorityValue owner,
int priority)
{
Contract.Requires <ArgumentNullException>(owner != null);
_owner = owner;
Priority = priority;
Value = _directValue = PerspexProperty.UnsetValue;
ActiveBindingIndex = -1;
Bindings = new LinkedList <PriorityBindingEntry>();
}
/// <summary>
/// Creates a <see cref="PriorityValue"/> for a <see cref="PerspexProperty"/>.
/// </summary>
/// <param name="property">The property.</param>
/// <returns>The <see cref="PriorityValue"/>.</returns>
private PriorityValue CreatePriorityValue(PerspexProperty property)
{
var validate = ((IStyledPropertyAccessor)property).GetValidationFunc(GetType());
Func <object, object> validate2 = null;
if (validate != null)
{
validate2 = v => validate(this, v);
}
PriorityValue result = new PriorityValue(
this,
property,
property.PropertyType,
validate2);
return(result);
}
/// <summary>
/// Sets a <see cref="PerspexProperty"/> value.
/// </summary>
/// <param name="property">The property.</param>
/// <param name="value">The value.</param>
public void SetValue(PerspexProperty property, object value)
{
Contract.Requires <NullReferenceException>(property != null);
const int Priority = (int)BindingPriority.LocalValue;
PriorityValue v;
if (!this.IsRegistered(property))
{
throw new InvalidOperationException(string.Format(
"Property '{0}' not registered on '{1}'",
property.Name,
this.GetType()));
}
if (!PriorityValue.IsValidValue(value, property.PropertyType))
{
throw new InvalidOperationException(string.Format(
"Invalid value for Property '{0}': {1} ({2})",
property.Name,
value,
value.GetType().FullName));
}
if (!this.values.TryGetValue(property, out v))
{
if (value == PerspexProperty.UnsetValue)
{
return;
}
v = this.CreatePriorityValue(property);
this.values.Add(property, v);
}
this.Log().Debug(
"Set local value of {0}.{1} (#{2:x8}) to {3}",
this.GetType().Name,
property.Name,
this.GetHashCode(),
value);
v.Replace(Observable.Never <object>().StartWith(value), Priority);
}
/// <summary>
/// Creates a <see cref="PriorityValue"/> for a <see cref="PerspexProperty"/>.
/// </summary>
/// <param name="property">The property.</param>
/// <returns>The <see cref="PriorityValue"/>.</returns>
private PriorityValue CreatePriorityValue(PerspexProperty property)
{
var validate = ((IStyledPropertyAccessor)property).GetValidationFunc(GetType());
Func <object, object> validate2 = null;
if (validate != null)
{
validate2 = v => validate(this, v);
}
PriorityValue result = new PriorityValue(
this,
property.Name,
property.PropertyType,
validate2);
result.Changed.Subscribe(x =>
{
object oldValue = (x.Item1 == PerspexProperty.UnsetValue) ?
GetDefaultValue(property) :
x.Item1;
object newValue = (x.Item2 == PerspexProperty.UnsetValue) ?
GetDefaultValue(property) :
x.Item2;
if (!Equals(oldValue, newValue))
{
RaisePropertyChanged(property, oldValue, newValue, (BindingPriority)result.ValuePriority);
Logger.Verbose(
LogArea.Property,
this,
"{Property} changed from {$Old} to {$Value} with priority {Priority}",
property,
oldValue,
newValue,
(BindingPriority)result.ValuePriority);
}
});
return(result);
}
/// <summary>
/// Creates a <see cref="PriorityValue"/> for a <see cref="PerspexProperty"/>.
/// </summary>
/// <param name="property">The property.</param>
/// <returns>The <see cref="PriorityValue"/>.</returns>
private PriorityValue CreatePriorityValue(PerspexProperty property)
{
Func <object, object> coerce = null;
if (property.Coerce != null)
{
coerce = v => property.Coerce(this, v);
}
PriorityValue result = new PriorityValue(property.Name, property.PropertyType, coerce);
result.Changed.Subscribe(x =>
{
object oldValue = (x.Item1 == PerspexProperty.UnsetValue) ?
this.GetDefaultValue(property) :
x.Item1;
object newValue = (x.Item2 == PerspexProperty.UnsetValue) ?
this.GetDefaultValue(property) :
x.Item2;
if (!object.Equals(oldValue, newValue))
{
this.RaisePropertyChanged(property, oldValue, newValue, (BindingPriority)result.ValuePriority);
this.Log().Debug(
"Value of {0}.{1} (#{2:x8}) changed from {3} to {4}",
this.GetType().Name,
property.Name,
this.GetHashCode(),
oldValue,
newValue);
}
});
return(result);
}
