private object GetAnimationBaseValue()
{
if (dependencyObject == null)
{
return(ObservableValue.UnsetValue);
}
IDependencyPropertyValueEntry entry = dependencyObject.GetValueEntry(dependencyProperty);
return(entry.GetBaseValue(true));
}
private void SetValue(DependencyProperty dependencyProperty, DependencyPropertyKey dependencyPropertyKey, object value, bool setCurrentValue = false, BaseValueSource source = BaseValueSource.Unknown)
{
VerifyReadOnlyProperty(dependencyProperty, dependencyPropertyKey);
IExpressionProvider newExpressionProvider = value as IExpressionProvider;
if (newExpressionProvider == null && !dependencyProperty.IsValidValue(value))
{
return; // invalid value
}
IDependencyPropertyValueEntry entry = GetInitializedValueEntry(dependencyProperty);
IExpression oldExpression = setCurrentValue ?
entry.GetBaseValue(false) as IExpression : // current value may be set in the top priority expression
entry.GetBaseValue((int)source, false) as IExpression;
if (newExpressionProvider != null)
{
value = newExpressionProvider.CreateExpression(this, dependencyProperty);
}
else if (oldExpression != null && oldExpression.SetValue(value))
{
return; // value (current or not) was set in the existing expression, nothing else to do
}
if (setCurrentValue)
{
entry.SetCurrentValue(value);
return; // base value isn't changed
}
if (oldExpression is IDisposable) // expression is being replaced
{
((IDisposable)oldExpression).Dispose();
}
entry.SetBaseValue((int)source, value);
entry.ClearCurrentValue();
}
public object GetBaseValue(bool flattened)
{
return(source.GetBaseValue(flattened));
}