private static void OnMultiBindingChanged(DependencyObject d, DependencyPropertyChangedEventArgs args)
{
Setter setter = d as Setter;
if (setter == null || setter.Property == null || args.OldValue != null)
{
throw new InvalidOperationException("Can only apply Multibinding attached property on a Setter where the Property has been set before and no value has previosly been assigned to the Multibinding property.");
}
if (args.NewValue != null)
{
if (DesignerProperties.IsInDesignTool)
{
return;
}
MultiBinding mb = (MultiBinding)args.NewValue;
mb.ApplyToStyle(setter);
setter.Value = mb;
}
}
private static void OnDependencyPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs args)
{
MultiBinding mb = (MultiBinding)d;
mb.CheckSealed();
}
public static void SetStyleBinding(DependencyObject obj, MultiBinding value)
{
obj.SetValue(StyleBindingProperty, value);
}
/// <summary>
/// Applies this <see cref="MultiBindingExpression"/> to the target
/// </summary>
/// <returns></returns>
private void ApplyToTarget()
{
int dataPropertyIndex; // Next data property index to use
// Get any existing MultiBindingInfo for this target
List <MultiBindingExpression> mbExpressions = GetMultiBindingExpressions(Target);
if (mbExpressions == null) // if no existing MultiBindings on this target
{
mbExpressions = new List <MultiBindingExpression>(1);
dataPropertyIndex = 0;
}
else
{
// Fetch last used data property index from last expression.
dataPropertyIndex = mbExpressions[mbExpressions.Count - 1].m_lastIndex + 1;
}
// Fill in this expression with information about this binding and all sources, converters and bindings.
// and set attached data properties on the target as required.
m_sourceStartIndex = dataPropertyIndex;
foreach (DependencyProperty sourceProperty in MultiBinding.SourceProperties)
{
object localValue = MultiBinding.ReadLocalValue(sourceProperty);
if (localValue == DependencyProperty.UnsetValue)
{
break;
}
SetDataProperty(dataPropertyIndex++, localValue);
}
if (MultiBinding.Bindings != null && MultiBinding.Bindings.Count > 0)
{
if (dataPropertyIndex != m_sourceStartIndex)
{
throw new InvalidOperationException("MutliBinding.Bindings cannot be used at the same time as Source-properties.");
}
for (int i = 0; i < MultiBinding.Bindings.Count; i++)
{
SetDataProperty(dataPropertyIndex++, MultiBinding.Bindings[i]);
}
}
m_sourceCount = dataPropertyIndex - m_sourceStartIndex;
object converter = MultiBinding.ReadLocalValue(MultiBinding.ConverterProperty);
if (converter is BindingExpression)
{
m_converterIndex = dataPropertyIndex++;
SetDataProperty(m_converterIndex, converter);
}
object converterParameter = MultiBinding.ReadLocalValue(MultiBinding.ConverterParameterProperty);
if (converterParameter is BindingExpression)
{
m_converterParameterIndex = dataPropertyIndex++;
SetDataProperty(m_converterParameterIndex, converterParameter);
}
object stringFormat = MultiBinding.ReadLocalValue(MultiBinding.StringFormatProperty);
if (stringFormat is BindingExpression)
{
m_stringFormatIndex = dataPropertyIndex++;
SetDataProperty(m_stringFormatIndex, stringFormat);
}
m_lastIndex = dataPropertyIndex - 1;
// Update MultiBindingInfoProperties for target
mbExpressions.Add(this);
if (mbExpressions.Count == 1)
{
Target.SetValue(MultiBindingExpressionsProperty, mbExpressions);
}
// Queue up an update request to ensure that the SourceValues property will be set.
//BeginUpdate();
}