internal static void ValidateSources(DependencyObject d, DependencySource[] newSources, Expression expr)
{
// Make sure all Sources are owned by the same thread.
if (newSources != null)
{
Dispatcher dispatcher = d.Dispatcher;
for (int i = 0; i < newSources.Length; i++)
{
Dispatcher sourceDispatcher = newSources[i].DependencyObject.Dispatcher;
if (sourceDispatcher != dispatcher && !(expr.SupportsUnboundSources && sourceDispatcher == null))
{
throw new ArgumentException(SR.Get(SRID.SourcesMustBeInSameThread));
}
}
}
}
internal static void UpdateSourceDependentLists(DependencyObject d, DependencyProperty dp, DependencySource[] sources, Expression expr, bool add)
{
// Sources already validated to be on the same thread as Dependent (d)
if (sources != null)
{
// don't hold a reference on the dependent if the expression is doing
// the invalidations. This helps avoid memory leaks (bug 871139)
if (expr.ForwardsInvalidations)
{
d = null;
dp = null;
}
for (int i = 0; i < sources.Length; i++)
{
DependencySource source = sources[i];
// A Sealed DependencyObject does not have a Dependents list
// so don't bother updating it (or attempt to add one).
Debug.Assert((!source.DependencyObject.IsSealed) ||
(DependentListMapField.GetValue(source.DependencyObject) == default(object)));
if (!source.DependencyObject.IsSealed)
{
// Retrieve the DependentListMap for this source
// The list of dependents to invalidate is stored using a special negative key
FrugalMap dependentListMap;
object value = DependentListMapField.GetValue(source.DependencyObject);
if (value != null)
{
dependentListMap = (FrugalMap)value;
}
else
{
dependentListMap = new FrugalMap();
}
// Get list of DependentList off of ID map of Source
object dependentListObj = dependentListMap[source.DependencyProperty.GlobalIndex];
Debug.Assert(dependentListObj != null, "dependentList should either be unset or non-null");
// Add/Remove new Dependent (this) to Source's list
if (add)
{
DependentList dependentList;
if (dependentListObj == DependencyProperty.UnsetValue)
{
dependentListMap[source.DependencyProperty.GlobalIndex] = dependentList = new DependentList();
}
else
{
dependentList = (DependentList)dependentListObj;
}
dependentList.Add(d, dp, expr);
}
else
{
if (dependentListObj != DependencyProperty.UnsetValue)
{
DependentList dependentList = (DependentList)dependentListObj;
dependentList.Remove(d, dp, expr);
if (dependentList.IsEmpty)
{
// No more dependencies for this property; reclaim the space if we can.
dependentListMap[source.DependencyProperty.GlobalIndex] = DependencyProperty.UnsetValue;
}
}
}
// Set the updated struct back into the source's _localStore.
DependentListMapField.SetValue(source.DependencyObject, dependentListMap);
}
}
}
}
//
// Changes the sources of an existing Expression
//
internal static void ChangeExpressionSources(Expression expr, DependencyObject d, DependencyProperty dp, DependencySource[] newSources)
{
if (!expr.ForwardsInvalidations)
{
// Get current local value (should be provided Expression)
// (No need to go through read local callback, just checking
// for presence of Expression)
EntryIndex entryIndex = d.LookupEntry(dp.GlobalIndex);
if (!entryIndex.Found || (d._effectiveValues[entryIndex.Index].LocalValue != expr))
{
throw new ArgumentException(SR.Get(SRID.SourceChangeExpressionMismatch));
}
}
// Get current sources
// CALLBACK
DependencySource[] currentSources = expr.GetSources();
// Remove old
if (currentSources != null)
{
UpdateSourceDependentLists(d, dp, currentSources, expr, false); // Remove
}
// Add new
if (newSources != null)
{
UpdateSourceDependentLists(d, dp, newSources, expr, true); // Add
}
}
private EffectiveValueEntry EvaluateExpression(
EntryIndex entryIndex,
DependencyProperty dp,
Expression expr,
PropertyMetadata metadata,
EffectiveValueEntry oldEntry,
EffectiveValueEntry newEntry)
{
object value = expr.GetValue(this, dp);
bool isDeferredReference = false;
if (value != DependencyProperty.UnsetValue && value != Expression.NoValue)
{
isDeferredReference = (value is DeferredReference);
if (!isDeferredReference && !dp.IsValidValue(value))
{
#region EventTracing
#if VERBOSE_PROPERTY_EVENT
if (isDynamicTracing)
{
if (EventTrace.IsEnabled(EventTrace.Flags.performance, EventTrace.Level.verbose))
{
EventTrace.EventProvider.TraceEvent(EventTrace.PROPERTYGUID,
MS.Utility.EventType.EndEvent,
EventTrace.PROPERTYVALIDATION, 0xFFF );
}
}
#endif
#endregion EventTracing
throw new InvalidOperationException(SR.Get(SRID.InvalidPropertyValue, value, dp.Name));
}
}
else
{
if (value == Expression.NoValue)
{
// The expression wants to "hide". First set the
// expression value to NoValue to indicate "hiding".
newEntry.SetExpressionValue(Expression.NoValue, expr);
// Next, get the expression value some other way.
if (!dp.ReadOnly)
{
EvaluateBaseValueCore(dp, metadata, ref newEntry);
value = newEntry.GetFlattenedEntry(RequestFlags.FullyResolved).Value;
}
else
{
value = DependencyProperty.UnsetValue;
}
}
// if there is still no value, use the default
if (value == DependencyProperty.UnsetValue)
{
value = metadata.GetDefaultValue(this, dp);
}
}
// Set the expr and its evaluated value into
// the _effectiveValues cache
newEntry.SetExpressionValue(value, expr);
return newEntry;
}
internal void InvalidateLocalBindings ()
{
if (expressions == null || expressions.Count == 0)
return;
if (invalidatingLocalBindings)
return;
invalidatingLocalBindings = true;
DependencyProperty[] keys = new DependencyProperty [expressions.Keys.Count];
Expression[] values = new Expression [expressions.Values.Count];
expressions.Keys.CopyTo (keys, 0);
expressions.Values.CopyTo (values, 0);
for (int i = 0; i < keys.Length; i ++) {
if (values[i] is BindingExpressionBase) {
BindingExpressionBase beb = (BindingExpressionBase) values[i];
beb.Invalidate ();
SetValue (keys[i], beb);
}
}
invalidatingLocalBindings = false;
}