//
// This method
// 1. Adds or removes per-instance state on the container/child (push model)
// 2. Processes a single value that needs per-instance storage
//
internal static void ProcessInstanceValue(
DependencyObject target,
int childIndex,
HybridDictionary instanceValues,
DependencyProperty dp,
int i,
bool apply)
{
// If we get this far, it's because there's a value
// in the property value list of an active style that requires
// per-instance storage. The initialization (CreateInstaceData)
// should have created the InstanceValues hashtable by now.
Debug.Assert(instanceValues != null, "InstanceValues hashtable should have been created at initialization time.");
InstanceValueKey key = new InstanceValueKey(childIndex, dp.GlobalIndex, i);
if (apply)
{
// Store a sentinel value in per-instance StyleData.
// The actual value is created only on demand.
instanceValues[key] = NotYetApplied;
}
else
{
// Remove the instance value from the table
object value = instanceValues[key];
instanceValues.Remove(key);
Expression expr;
Freezable freezable;
if ((expr = value as Expression)!= null)
{
// if the instance value is an expression, detach it
expr.OnDetach(target, dp);
}
else if ((freezable = value as Freezable)!= null)
{
// if the instance value is a Freezable, remove its
// inheritance context
target.RemoveSelfAsInheritanceContext(freezable, dp);
}
}
}
//
// This method
// 1. Retrieves an instance value from per-instance StyleData.
// 2. Creates the StyleData if this is the first request.
//
internal static object GetInstanceValue(
UncommonField<HybridDictionary []> dataField,
DependencyObject container,
FrameworkElement feChild,
FrameworkContentElement fceChild,
int childIndex,
DependencyProperty dp,
int i,
ref EffectiveValueEntry entry)
{
object rawValue = entry.Value;
DependencyObject child = null;
FrameworkElement feContainer;
FrameworkContentElement fceContainer;
Helper.DowncastToFEorFCE(container, out feContainer, out fceContainer, true);
HybridDictionary[] styleData = (dataField != null) ? dataField.GetValue(container) : null;
HybridDictionary instanceValues = (styleData != null) ? styleData[(int)InstanceStyleData.InstanceValues] : null;
InstanceValueKey key = new InstanceValueKey(childIndex, dp.GlobalIndex, i);
object value = (instanceValues != null)? instanceValues[key] : null;
bool isRequestingExpression = (feChild != null) ? feChild.IsRequestingExpression : fceChild.IsRequestingExpression;
if (value == null)
{
value = NotYetApplied;
}
// if the value is a detached expression, replace it with a new one
Expression expr = value as Expression;
if (expr != null && expr.HasBeenDetached)
{
value = NotYetApplied;
}
// if this is the first request, create the value
if (value == NotYetApplied)
{
child = feChild;
if (child == null)
child = fceChild;
MarkupExtension me;
Freezable freezable;
if ((me = rawValue as MarkupExtension) != null)
{
// exception: if the child is not yet initialized and the request
// is for an expression, don't create the value. This gives the parser
// a chance to set local values, to override the style-defined values.
if (isRequestingExpression)
{
bool isInitialized = (feChild != null) ? feChild.IsInitialized : fceChild.IsInitialized;
if (!isInitialized)
{
return DependencyProperty.UnsetValue;
}
}
ProvideValueServiceProvider provideValueServiceProvider = new ProvideValueServiceProvider();
provideValueServiceProvider.SetData( child, dp );
value = me.ProvideValue(provideValueServiceProvider);
}
else if ((freezable = rawValue as Freezable) != null)
{
value = freezable.Clone();
child.ProvideSelfAsInheritanceContext(value, dp);
}
// store it in per-instance StyleData (even if it's DependencyProperty.UnsetValue)
Debug.Assert(value != NotYetApplied, "attempt to retrieve instance value that was never set");
instanceValues[key] = value;
if (value != DependencyProperty.UnsetValue)
{
expr = value as Expression;
// if the instance value is an expression, attach it
if (expr != null)
{
expr.OnAttach(child, dp);
}
}
}
// if the value is an Expression (and we're being asked for the real value),
// delegate to the expression.
if (expr != null)
{
if (!isRequestingExpression)
{
if (child == null)
{
child = feChild;
if (child == null)
child = fceChild;
}
entry.ResetValue(DependencyObject.ExpressionInAlternativeStore, true);
entry.SetExpressionValue(expr.GetValue(child, dp), DependencyObject.ExpressionInAlternativeStore);
}
else
{
entry.Value = value;
}
}
else
{
entry.Value = value;
}
return value;
}
// Token: 0x06000967 RID: 2407 RVA: 0x00020FB0 File Offset: 0x0001F1B0
public override bool Equals(object o)
{
InstanceValueKey instanceValueKey = o as InstanceValueKey;
return(instanceValueKey != null && (this._childIndex == instanceValueKey._childIndex && this._dpIndex == instanceValueKey._dpIndex) && this._index == instanceValueKey._index);
}
