// Given a multi data trigger and associated context information,
// evaluate the old and new states of the trigger.
// The short-circuit logic of multi property trigger applies here too.
// we bail if any of the "other" conditions evaluate to false.
private static void EvaluateOldNewStates( MultiDataTrigger multiDataTrigger,
DependencyObject triggerContainer,
BindingBase binding, BindingValueChangedEventArgs changedArgs, UncommonField<HybridDictionary[]> dataField,
Style style, FrameworkTemplate frameworkTemplate,
out bool oldState, out bool newState )
{
BindingBase evaluationBinding = null;
object evaluationValue = null;
TriggerCondition[] conditions = multiDataTrigger.TriggerConditions;
// Set up the default condition: A trigger with no conditions will never evaluate to true.
oldState = false;
newState = false;
for( int i = 0; i < multiDataTrigger.Conditions.Count; i++ )
{
evaluationBinding = conditions[i].Binding;
Debug.Assert( evaluationBinding != null,
"A null binding was encountered in a MultiDataTrigger conditions collection - this is invalid input and should have been caught earlier.");
if( evaluationBinding == binding )
{
// The binding that changed belonged to the current condition.
oldState = conditions[i].ConvertAndMatch(changedArgs.OldValue);
newState = conditions[i].ConvertAndMatch(changedArgs.NewValue);
if( oldState == newState )
{
// There couldn't possibly be a transition here, abort. The
// returned values here aren't necessarily the state of the
// triggers, but we only care about a transition today. If
// we care about actual values, we'll need to continue evaluation.
return;
}
}
else
{
evaluationValue = GetDataTriggerValue(dataField, triggerContainer, evaluationBinding);
if( !conditions[i].ConvertAndMatch(evaluationValue) )
{
// A condition other than the one changed has evaluated to false.
// There couldn't possibly be a transition here, short-circuit and abort.
oldState = false;
newState = false;
return;
}
}
}
// We should only get this far only if the binding change causes
// a true->false (or vice versa) transition in one of the conditions,
// AND that every other condition evaluated to true.
return;
}
// Given a single data trigger and associated context information,
// evaluate the old and new states of the trigger.
private static void EvaluateOldNewStates( DataTrigger dataTrigger,
DependencyObject triggerContainer,
BindingBase binding, BindingValueChangedEventArgs bindingChangedArgs, UncommonField<HybridDictionary[]> dataField,
Style style, FrameworkTemplate frameworkTemplate,
out bool oldState, out bool newState )
{
TriggerCondition[] conditions = dataTrigger.TriggerConditions;
Debug.Assert( conditions != null && conditions.Length == 1,
"This method assumes there is exactly one TriggerCondition." );
oldState = conditions[0].ConvertAndMatch(bindingChangedArgs.OldValue);
newState = conditions[0].ConvertAndMatch(bindingChangedArgs.NewValue);
}
// Called from either the Style-specific ExecuteOnApplyEnterActions or the
// Template-specific version. This section is the common code for both that
// walks through the trigger collection and execute applicable actions.
private static void ExecuteOnApplyEnterExitActionsLoop( DependencyObject triggerContainer, TriggerCollection triggers,
Style style, FrameworkTemplate ft, UncommonField<HybridDictionary[]> dataField )
{
TriggerBase triggerBase;
bool triggerState;
for( int i = 0; i < triggers.Count; i++ )
{
triggerBase = triggers[i];
if( (!triggerBase.HasEnterActions) && (!triggerBase.HasExitActions) )
{
; // Trigger has neither enter nor exit actions. There's nothing to run anyway, so skip.
}
else if( triggerBase.ExecuteEnterActionsOnApply ||
triggerBase.ExecuteExitActionsOnApply )
{
// Look for any SourceName in the condition
if( NoSourceNameInTrigger( triggerBase ) )
{
// Evaluate the current state of the trigger.
triggerState = triggerBase.GetCurrentState( triggerContainer, dataField );
if( triggerState && triggerBase.ExecuteEnterActionsOnApply )
{
// Trigger is true, and Trigger wants EnterActions to be executed on Style/Template application.
InvokeActions( triggerBase.EnterActions, triggerBase, triggerContainer,
style, ft );
}
else if( !triggerState && triggerBase.ExecuteExitActionsOnApply )
{
// Trigger is false, and Trigger wants ExitActions to be executed on Style/Template application.
InvokeActions( triggerBase.ExitActions, triggerBase, triggerContainer,
style, ft );
}
}
else
{
// If one or more conditions are dependent on a template
// child, then it can't possibly apply immediately.
}
}
}
}
//
// This method
// 1. Is called whenever a new Style/Template is applied to an FE/FCE
// 2. It adds per-instance StyleData/TemplateData for the new Style/Template
//
internal static void CreateInstanceData(
UncommonField<HybridDictionary[]> dataField,
DependencyObject container,
FrameworkElement fe,
FrameworkContentElement fce,
Style newStyle,
FrameworkTemplate newFrameworkTemplate )
{
Debug.Assert((fe != null && fce == null) || (fe == null && fce != null));
Debug.Assert((fe != null && fe == container) || (fce != null && fce == container));
Debug.Assert(newStyle != null || newFrameworkTemplate != null );
if (newStyle != null)
{
if (newStyle.HasInstanceValues)
{
HybridDictionary instanceValues = EnsureInstanceData(dataField, container, InstanceStyleData.InstanceValues);
StyleHelper.ProcessInstanceValuesForChild(
container, container, 0, instanceValues, true,
ref newStyle.ChildRecordFromChildIndex);
}
}
else if (newFrameworkTemplate != null)
{
if (newFrameworkTemplate.HasInstanceValues)
{
HybridDictionary instanceValues = EnsureInstanceData(dataField, container, InstanceStyleData.InstanceValues);
StyleHelper.ProcessInstanceValuesForChild(
container, container, 0, instanceValues, true,
ref newFrameworkTemplate.ChildRecordFromChildIndex);
}
}
}
// evaluate the current state of the trigger
internal override bool GetCurrentState(DependencyObject container, UncommonField<HybridDictionary[]> dataField)
{
bool retVal = (TriggerConditions.Length > 0);
for( int i = 0; retVal && i < TriggerConditions.Length; i++ )
{
Debug.Assert( TriggerConditions[i].SourceChildIndex == 0,
"This method was created to handle properties on the containing object, more work is needed to handle templated children too." );
retVal = TriggerConditions[i].Match(container.GetValue(TriggerConditions[i].Property));
}
return retVal;
}
// The ordering of how things are created and which methods are called are ABSOLUTELY critical
// Getting this order slightly off will result in several issues that are very hard to debug.
//
// The order must be:
// Register name to the TemplateNameScope (Either the real name specified by x:Name or
// RuntimeNameProperty or a fake name that we have to generate to call
// RegisterName. This is CRUCIAL since RegisterName sets the TemplatedParent
// and the TemplateChildIndex on the object
// If we're dealing with the root, wire the object to the parent (via FE.TemplateChild
// if we're dealing with an FE as the container or using FEF if it's not an FE)
// Invalidate properties on the object
private DependencyObject LoadOptimizedTemplateContent(DependencyObject container,
IComponentConnector componentConnector,
IStyleConnector styleConnector, List<DependencyObject> affectedChildren, UncommonField<Hashtable> templatedNonFeChildrenField)
{
if (Names == null)
{
Names = new XamlContextStack<Frame>(() => new Frame());
}
DependencyObject rootObject = null;
if (TraceMarkup.IsEnabled)
{
TraceMarkup.Trace(TraceEventType.Start, TraceMarkup.Load);
}
FrameworkElement feContainer = container as FrameworkElement;
bool isTemplatedParentAnFE = feContainer != null;
TemplateNameScope nameScope = new TemplateNameScope(container, affectedChildren, this);
XamlObjectWriterSettings settings = System.Windows.Markup.XamlReader.CreateObjectWriterSettings(_templateHolder.ObjectWriterParentSettings);
settings.ExternalNameScope = nameScope;
settings.RegisterNamesOnExternalNamescope = true;
IEnumerator<String> nameEnumerator = ChildNames.GetEnumerator();
// Delegate for AfterBeginInit event
settings.AfterBeginInitHandler =
delegate(object sender, System.Xaml.XamlObjectEventArgs args)
{
HandleAfterBeginInit(args.Instance, ref rootObject, container, feContainer, nameScope, nameEnumerator);
if (XamlSourceInfoHelper.IsXamlSourceInfoEnabled)
{
XamlSourceInfoHelper.SetXamlSourceInfo(args.Instance, args, null);
}
};
// Delegate for BeforeProperties event
settings.BeforePropertiesHandler =
delegate(object sender, System.Xaml.XamlObjectEventArgs args)
{
HandleBeforeProperties(args.Instance, ref rootObject, container, feContainer, nameScope);
};
// Delegate for XamlSetValue event
settings.XamlSetValueHandler =
delegate(object sender, System.Windows.Markup.XamlSetValueEventArgs setArgs)
{
setArgs.Handled = ReceivePropertySet(sender, setArgs.Member, setArgs.Value, container);
};
XamlObjectWriter objectWriter = _templateHolder.ObjectWriterFactory.GetXamlObjectWriter(settings);
try
{
LoadTemplateXaml(objectWriter);
}
finally
{
if (TraceMarkup.IsEnabled)
{
TraceMarkup.Trace(TraceEventType.Stop, TraceMarkup.Load, rootObject);
}
}
return rootObject;
}
// Instantiate a tree. This is a recursive routine that will build the
// subtree via calls to itself. The root node being instantiated will
// have identical references for the "container" and "parent" parameters.
// The "affectedChildren" and "noChildIndexChildren" parameters refer to the children
// chain for the "container" object. This chain will have all the
// children - not just the immediate children. The node being
// instantiated here will be added to this chain.
// The tree is instantiated in a depth-first traversal, so children nodes
// are added to the chain in depth-first order as well.
//[CodeAnalysis("AptcaMethodsShouldOnlyCallAptcaMethods")] //Tracking Bug: 29647
internal DependencyObject InstantiateTree(
UncommonField<HybridDictionary[]> dataField,
DependencyObject container,
DependencyObject parent,
List<DependencyObject> affectedChildren,
ref List<DependencyObject> noChildIndexChildren,
ref FrugalStructList<ChildPropertyDependent> resourceDependents)
{
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose, EventTrace.Event.WClientParseFefCrInstBegin);
FrameworkElement containerAsFE = container as FrameworkElement;
bool isContainerAnFE = containerAsFE != null;
DependencyObject treeNode = null;
// If we have text, just add it to the parent. Otherwise create the child
// subtree
if (_text != null)
{
// of FrameworkContentElement parent. This is the logical equivalent
// to what happens when adding a child to a visual collection.
IAddChild addChildParent = parent as IAddChild;
if (addChildParent == null)
{
throw new InvalidOperationException(SR.Get(SRID.TypeMustImplementIAddChild,
parent.GetType().Name));
}
else
{
addChildParent.AddText(_text);
}
}
else
{
// Factory create instance
treeNode = CreateDependencyObject();
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose, EventTrace.Event.WClientParseFefCrInstEnd);
// The tree node is either a FrameworkElement or a FrameworkContentElement.
// we'll deal with one or the other...
FrameworkObject treeNodeFO = new FrameworkObject(treeNode);
Visual3D treeNodeVisual3D = null;
bool treeNodeIsVisual3D = false;
if (!treeNodeFO.IsValid)
{
// If it's neither of those, we have special support for Visual3D
treeNodeVisual3D = treeNode as Visual3D;
if (treeNodeVisual3D != null)
treeNodeIsVisual3D = true;
}
Debug.Assert( treeNodeFO.IsValid || (treeNodeVisual3D != null),
"We should not be trying to instantiate a node that is neither FrameworkElement nor FrameworkContentElement. A type check should have been done when Type is set");
// And here's the bool we'll use to make the decision.
bool treeNodeIsFE = treeNodeFO.IsFE;
// Handle FE/FCE-specific optimizations
if (!treeNodeIsVisual3D)
{
// Postpone "Initialized" event
NewNodeBeginInit( treeNodeIsFE, treeNodeFO.FE, treeNodeFO.FCE );
// Set the resource reference flags
if (StyleHelper.HasResourceDependentsForChild(_childIndex, ref resourceDependents))
{
treeNodeFO.HasResourceReference = true;
}
// Update the two chains that tracks all the nodes created
// from all the FrameworkElementFactory of this Style.
UpdateChildChains( _childName, _childIndex,
treeNodeIsFE, treeNodeFO.FE, treeNodeFO.FCE,
affectedChildren, ref noChildIndexChildren );
// All FrameworkElementFactory-created elements point to the object
// whose Style.VisualTree definition caused all this to occur
NewNodeStyledParentProperty( container, isContainerAnFE, treeNodeIsFE, treeNodeFO.FE, treeNodeFO.FCE );
// Initialize the per-instance data for the new element. This
// needs to be done before any properties are invalidated.
if (_childIndex != -1)
{
Debug.Assert( _frameworkTemplate != null );
StyleHelper.CreateInstanceDataForChild(dataField, container, treeNode, _childIndex,
_frameworkTemplate.HasInstanceValues, ref _frameworkTemplate.ChildRecordFromChildIndex);
}
// If this element needs to know about the Loaded or Unloaded events, set the optimization
// bit in the element
if (HasLoadedChangeHandler)
{
BroadcastEventHelper.AddHasLoadedChangeHandlerFlagInAncestry(treeNode);
}
}
else
{
if (_childName != null)
{
// Add this instance to the child index chain so that it may
// be tracked by the style
affectedChildren.Add(treeNode);
}
else
{
// Child nodes with no _childID (hence no _childIndex) are
// tracked on a separate chain that will be appended to the
// main chain for cleanup purposes.
if (noChildIndexChildren == null)
{
noChildIndexChildren = new List<DependencyObject>(4);
}
noChildIndexChildren.Add(treeNode);
}
}
// New node is initialized, build tree top down
// (Node added before children of node)
if (container == parent)
{
// Set the NameScope on the root of the Template generated tree
TemplateNameScope templateNameScope = new TemplateNameScope(container);
NameScope.SetNameScope(treeNode, templateNameScope);
// This is the root of the tree
if (isContainerAnFE)
{
// The root is added to the Visual tree (not logical) for the
// case of FrameworkElement parents
containerAsFE.TemplateChild = treeNodeFO.FE;
}
else
{
// The root is added to the logical tree for the case
// of FrameworkContentElement parent. This is the logical equivalent
// to what happens when adding a child to a visual collection.
AddNodeToLogicalTree( (FrameworkContentElement)parent, _type,
treeNodeIsFE, treeNodeFO.FE, treeNodeFO.FCE );
}
}
else
{
// Call parent IAddChild to add treeNodeFO
AddNodeToParent( parent, treeNodeFO );
}
// Either set properties or invalidate them, depending on the type
if (!treeNodeIsVisual3D)
{
// For non-3D content, we need to invalidate any properties that
// came from FrameworkElementFactory.SetValue or VisulaTrigger.SetValue
// so that they can get picked up.
Debug.Assert( _frameworkTemplate != null );
StyleHelper.InvalidatePropertiesOnTemplateNode(
container,
treeNodeFO,
_childIndex,
ref _frameworkTemplate.ChildRecordFromChildIndex,
false /*isDetach*/,
this);
}
else
{
// For 3D, which doesn't understand templates, we set the properties directly
// onto the newly-instantiated element.
for (int i = 0; i < PropertyValues.Count; i++)
{
if (PropertyValues[i].ValueType == PropertyValueType.Set)
{
// Get the value out of the table.
object o = PropertyValues[i].ValueInternal;
// If it's a freezable that can't be frozen, it's probably not sharable,
// so we make a copy of it.
Freezable freezableValue = o as Freezable;
if (freezableValue != null && !freezableValue.CanFreeze)
{
o = freezableValue.Clone();
}
// Or, if it's a markup extension, get the value
// to set on this property from the MarkupExtension itself.
MarkupExtension me = o as MarkupExtension;
if (me != null)
{
ProvideValueServiceProvider serviceProvider = new ProvideValueServiceProvider();
serviceProvider.SetData( treeNodeVisual3D, PropertyValues[i].Property );
o = me.ProvideValue( serviceProvider );
}
// Finally, set the value onto the object.
treeNodeVisual3D.SetValue(PropertyValues[i].Property, o);
}
else
{
// We don't support resource references, triggers, etc within the 3D content
throw new NotSupportedException(SR.Get(SRID.Template3DValueOnly, PropertyValues[i].Property) );
}
}
}
// Build child tree from factories
FrameworkElementFactory childFactory = _firstChild;
while (childFactory != null)
{
childFactory.InstantiateTree(
dataField,
container,
treeNode,
affectedChildren,
ref noChildIndexChildren,
ref resourceDependents);
childFactory = childFactory._nextSibling;
}
if (!treeNodeIsVisual3D)
{
// Fire "Initialized" event
NewNodeEndInit( treeNodeIsFE, treeNodeFO.FE, treeNodeFO.FCE );
}
}
return treeNode;
}
// evaluate the current state of the trigger
internal override bool GetCurrentState(DependencyObject container, UncommonField<HybridDictionary[]> dataField)
{
Debug.Assert( TriggerConditions != null && TriggerConditions.Length == 1,
"This method assumes there is exactly one TriggerCondition." );
return TriggerConditions[0].ConvertAndMatch(StyleHelper.GetDataTriggerValue(dataField, container, TriggerConditions[0].Binding));
}
// ===========================================================================
// These methods are invoked when a Property
// value is fetched from a Style/Template
// ===========================================================================
#region GetValueMethods
//
// This method
// 1. Computes the value of a template child
// (Index is '0' when the styled container is asking)
//
internal static object GetChildValue(
UncommonField<HybridDictionary[]> dataField,
DependencyObject container,
int childIndex,
FrameworkObject child,
DependencyProperty dp,
ref FrugalStructList<ChildRecord> childRecordFromChildIndex,
ref EffectiveValueEntry entry,
out ValueLookupType sourceType,
FrameworkElementFactory templateRoot)
{
object value = DependencyProperty.UnsetValue;
sourceType = ValueLookupType.Simple;
// Check if this Child Index is represented in given data-structure
if ((0 <= childIndex) && (childIndex < childRecordFromChildIndex.Count))
{
// Fetch the childRecord for the given childIndex
ChildRecord childRecord = childRecordFromChildIndex[childIndex];
// Check if this Property is represented in the childRecord
int mapIndex = childRecord.ValueLookupListFromProperty.Search(dp.GlobalIndex);
if (mapIndex >= 0)
{
if (childRecord.ValueLookupListFromProperty.Entries[mapIndex].Value.Count > 0)
{
// Child Index/Property are both represented in this style/template,
// continue with value computation
// Pass into helper so ValueLookup struct can be accessed by ref
value = GetChildValueHelper(
dataField,
ref childRecord.ValueLookupListFromProperty.Entries[mapIndex].Value,
dp,
container,
child,
childIndex,
true,
ref entry,
out sourceType,
templateRoot);
}
}
}
return value;
}
//+----------------------------------------------------------------------------------
//
// ApplyTemplateContent
//
// Instantiate the content of the template (either from FEFs or from Baml).
// This is done for every element to which this template is attached.
//
//+----------------------------------------------------------------------------------
#region InstantiateSubTree
//[CodeAnalysis("AptcaMethodsShouldOnlyCallAptcaMethods")] //Tracking Bug: 29647
internal static bool ApplyTemplateContent(
UncommonField<HybridDictionary[]> dataField,
DependencyObject container,
FrameworkElementFactory templateRoot,
int lastChildIndex,
HybridDictionary childIndexFromChildID,
FrameworkTemplate frameworkTemplate)
{
Debug.Assert(frameworkTemplate != null );
bool visualsCreated = false;
FrameworkElement feContainer = container as FrameworkElement;
// Is this a FEF-style template?
if (templateRoot != null)
{
// Yes, we'll instantiate from a FEF tree.
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose, EventTrace.Event.WClientParseInstVisTreeBegin);
CheckForCircularReferencesInTemplateTree(container, frameworkTemplate );
// Container is considered ChildIndex '0' (Self), but,
// Container.ChildIndex isn't set
List<DependencyObject> affectedChildren = new List<DependencyObject>(lastChildIndex);
// Assign affectedChildren to container
TemplatedFeChildrenField.SetValue(container, affectedChildren);
// When building the template children chain, we keep a chain of
// nodes that don't need to be in the chain for property invalidation
// or lookup purposes. (And hence not assigned a TemplateChildIndex)
// We only need them in order to clean up their _templatedParent
// references (see FrameworkElement.ClearTemplateChain)
List<DependencyObject> noChildIndexChildren = null;
// Instantiate template
// Setup container's reference to first child in chain
// and add to tree
DependencyObject treeRoot = templateRoot.InstantiateTree(
dataField,
container,
container,
affectedChildren,
ref noChildIndexChildren,
ref frameworkTemplate.ResourceDependents);
Debug.Assert(treeRoot is FrameworkElement || treeRoot is FrameworkContentElement,
"Root node of tree must be a FrameworkElement or FrameworkContentElement. This should have been caught by set_VisualTree" );
// From childFirst to childLast is the chain of child nodes with
// childIndex. Append that chain with the chain of child nodes
// with no childIndex assigned.
if( noChildIndexChildren != null )
{
affectedChildren.AddRange(noChildIndexChildren);
}
visualsCreated = true;
if (feContainer != null && EventTrace.IsEnabled(EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose))
{
string label = feContainer.Name;
if (label == null || label.Length == 0)
label = container.GetHashCode().ToString(System.Globalization.CultureInfo.InvariantCulture);
EventTrace.EventProvider.TraceEvent(EventTrace.Event.WClientParseInstVisTreeEnd, EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose,
String.Format(System.Globalization.CultureInfo.InvariantCulture, "Style.InstantiateSubTree for {0} {1}", container.GetType().Name, label));
}
}
// It's not a FEF-style template, is it a non-empty optimized one?
else if (frameworkTemplate != null && frameworkTemplate.HasXamlNodeContent)
{
// Yes, create from the optimized template content.
EventTrace.EasyTraceEvent(EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose, EventTrace.Event.WClientParseInstVisTreeBegin);
CheckForCircularReferencesInTemplateTree(container, frameworkTemplate );
// Container is considered ChildIndex '0' (Self), but,
// Container.ChildIndex isn't set
List<DependencyObject> affectedChildren = new List<DependencyObject>(lastChildIndex);
// Assign affectedChildren to container
TemplatedFeChildrenField.SetValue(container, affectedChildren);
DependencyObject treeRoot;
// Load the content
treeRoot = frameworkTemplate.LoadContent( container, affectedChildren);
Debug.Assert(treeRoot == null || treeRoot is FrameworkElement || treeRoot is FrameworkContentElement,
"Root node of tree must be a FrameworkElement or FrameworkContentElement. This should have been caught by set_VisualTree" );
visualsCreated = true;
if (feContainer != null && EventTrace.IsEnabled(EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose))
{
string label = feContainer.Name;
if (label == null || label.Length == 0)
label = container.GetHashCode().ToString(System.Globalization.CultureInfo.InvariantCulture);
EventTrace.EventProvider.TraceEvent(EventTrace.Event.WClientParseInstVisTreeEnd, EventTrace.Keyword.KeywordXamlBaml, EventTrace.Level.Verbose,
String.Format(System.Globalization.CultureInfo.InvariantCulture, "Style.InstantiateSubTree for {0} {1}", container.GetType().Name, label));
}
}
// No template was supplied. Allow subclasses to provide the template.
// This is currently only implemented for FrameworkElement's.
else
{
if (feContainer != null)
{
// This template will not be driven by the Style in any way.
// Rather, it will be built and initialized by the callee
// CALLBACK
#if DEBUG
Debug.Assert( feContainer._buildVisualTreeVerification == VerificationState.WaitingForBuildVisualTree,
"The BuildVisualTree override has triggered another call to itself. This is not good - something between the two Style.InstantiateSubTree calls on the stack is doing A Very Bad Thing.");
feContainer._buildVisualTreeVerification = VerificationState.WaitingForAddCustomTemplateRoot;
bool exceptionThrown = true;
try
{
#endif
Debug.Assert(frameworkTemplate != null, "Only FrameworkTemplate has the ability to build a VisualTree by this means");
visualsCreated = frameworkTemplate.BuildVisualTree(feContainer);
#if DEBUG
exceptionThrown = false;
}
finally
{
if (!exceptionThrown) // results are unreliable if an exception was thrown
{
if( visualsCreated )
{
Debug.Assert( feContainer._buildVisualTreeVerification == VerificationState.WaitingForBuildVisualTreeCompletion,
"A derived class overriding BuildVisualTree must call AddCustomTemplateRoot to attach its custom subtree before exiting.");
}
else
{
Debug.Assert( feContainer._buildVisualTreeVerification == VerificationState.WaitingForAddCustomTemplateRoot,
"If a derived class overriding BuildVisualTree has called AddCustomTemplateRoot to attach its custom subtree, its BuildVisualTree must return true to indicate that it has done so.");
}
}
// All done building this visual tree, stand by for the next one.
feContainer._buildVisualTreeVerification = VerificationState.WaitingForBuildVisualTree;
}
#endif
}
}
return visualsCreated;
}
//
// This method
// 1. Is called when a style/template is removed from a container.
// 2. It is meant to release its data trigger information.
//
private static void ReleaseInstanceDataForDataTriggers(
UncommonField<HybridDictionary[]> dataField,
HybridDictionary instanceValues,
Style oldStyle,
FrameworkTemplate oldFrameworkTemplate)
{
Debug.Assert(oldStyle != null || oldFrameworkTemplate != null );
if (instanceValues == null)
return;
// the event handler depends only on whether the instance data
// applies to Style, Template, or ThemeStyle
EventHandler<BindingValueChangedEventArgs> handler;
if (dataField == StyleDataField)
{
handler = new EventHandler<BindingValueChangedEventArgs>(OnBindingValueInStyleChanged);
}
else if (dataField == TemplateDataField)
{
handler = new EventHandler<BindingValueChangedEventArgs>(OnBindingValueInTemplateChanged);
}
else
{
Debug.Assert(dataField == ThemeStyleDataField);
handler = new EventHandler<BindingValueChangedEventArgs>(OnBindingValueInThemeStyleChanged);
}
// clean up triggers with setters
HybridDictionary dataTriggerRecordFromBinding = null;
if (oldStyle != null)
{
dataTriggerRecordFromBinding = oldStyle._dataTriggerRecordFromBinding;
}
else if (oldFrameworkTemplate != null)
{
dataTriggerRecordFromBinding = oldFrameworkTemplate._dataTriggerRecordFromBinding;
}
if (dataTriggerRecordFromBinding != null)
{
foreach (object o in dataTriggerRecordFromBinding.Keys)
{
BindingBase binding = (BindingBase)o;
ReleaseInstanceDataForTriggerBinding(binding, instanceValues, handler);
}
}
// clean up triggers with actions
HybridDictionary dataTriggersWithActions = null;
if (oldStyle != null)
{
dataTriggersWithActions = oldStyle.DataTriggersWithActions;
}
else if (oldFrameworkTemplate != null)
{
dataTriggersWithActions = oldFrameworkTemplate.DataTriggersWithActions;
}
if (dataTriggersWithActions != null)
{
foreach (object o in dataTriggersWithActions.Keys)
{
BindingBase binding = (BindingBase)o;
ReleaseInstanceDataForTriggerBinding(binding, instanceValues, handler);
}
}
}
//
// This method
// 1. Ensures that the desired per-instance storage
// for Style/Template exists
// 2. Also allows you to specify initial capacity
//
internal static HybridDictionary EnsureInstanceData(
UncommonField<HybridDictionary[]> dataField,
DependencyObject container,
InstanceStyleData dataType,
int initialSize)
{
Debug.Assert((container is FrameworkElement) || (container is FrameworkContentElement), "Caller has queried with non-framework element. Bad caller, bad!");
Debug.Assert(dataType < InstanceStyleData.ArraySize, "Caller has queried using a value outside the range of the Enum. Bad caller, bad!");
HybridDictionary[] data = dataField.GetValue(container);
if (data == null)
{
data = new HybridDictionary[(int)InstanceStyleData.ArraySize];
dataField.SetValue(container, data);
}
if (data[(int)dataType] == null )
{
if( initialSize < 0 )
{
data[(int)dataType] = new HybridDictionary();
}
else
{
data[(int)dataType] = new HybridDictionary(initialSize);
}
}
return (HybridDictionary)data[(int)dataType];
}
//
// This method
// 1. Ensures that the desired per-instance storage
// for Style/Template exists
//
internal static HybridDictionary EnsureInstanceData(
UncommonField<HybridDictionary[]> dataField,
DependencyObject container,
InstanceStyleData dataType)
{
return EnsureInstanceData(dataField, container, dataType, -1);
}
//
// This method
// 1. Is called whenever a new Style/Template is upapplied from an FE/FCE
// 2. It removes per-instance StyleData/TemplateData for the old Style/Template
//
internal static void ReleaseInstanceData(
UncommonField<HybridDictionary[]> dataField,
DependencyObject container,
FrameworkElement fe,
FrameworkContentElement fce,
Style oldStyle,
FrameworkTemplate oldFrameworkTemplate,
InternalFlags hasGeneratedSubTreeFlag)
{
Debug.Assert((fe != null && fce == null) || (fe == null && fce != null));
Debug.Assert((fe != null && fe == container) || (fce != null && fce == container));
Debug.Assert(oldStyle != null || oldFrameworkTemplate != null );
// Fetch the per-instance data field value
HybridDictionary[] styleData = dataField.GetValue(container);
if (oldStyle != null)
{
HybridDictionary instanceValues = (styleData != null) ? styleData[(int)InstanceStyleData.InstanceValues] : null;
ReleaseInstanceDataForDataTriggers(dataField, instanceValues, oldStyle, oldFrameworkTemplate );
if (oldStyle.HasInstanceValues)
{
StyleHelper.ProcessInstanceValuesForChild(
container, container, 0, instanceValues, false,
ref oldStyle.ChildRecordFromChildIndex);
}
}
else if (oldFrameworkTemplate != null)
{
HybridDictionary instanceValues = (styleData != null) ? styleData[(int)InstanceStyleData.InstanceValues] : null;
ReleaseInstanceDataForDataTriggers(dataField, instanceValues, oldStyle, oldFrameworkTemplate );
if (oldFrameworkTemplate.HasInstanceValues)
{
StyleHelper.ProcessInstanceValuesForChild(
container, container, 0, instanceValues, false,
ref oldFrameworkTemplate.ChildRecordFromChildIndex);
}
}
else
{
HybridDictionary instanceValues = (styleData != null) ? styleData[(int)InstanceStyleData.InstanceValues] : null;
ReleaseInstanceDataForDataTriggers(dataField, instanceValues, oldStyle, oldFrameworkTemplate );
}
}
//
// This method
// 1. Adds the new TemplateNode's information to the container's per-instance
// StyleData/TemplateData. (This only makes sense for children created via
// FrameworkElementFactory. Children acquired via BuildVisualTree don't use
// any property-related funtionality of the Style/Template.)
//
internal static void CreateInstanceDataForChild(
UncommonField<HybridDictionary[]> dataField,
DependencyObject container,
DependencyObject child,
int childIndex,
bool hasInstanceValues,
ref FrugalStructList<ChildRecord> childRecordFromChildIndex)
{
if (hasInstanceValues)
{
HybridDictionary instanceValues = EnsureInstanceData(dataField, container, InstanceStyleData.InstanceValues);
StyleHelper.ProcessInstanceValuesForChild(
container, child, childIndex, instanceValues, true,
ref childRecordFromChildIndex);
}
}
//
// This method
// 1. Computes the property value given the ChildLookupValue list for it
//
private static object GetChildValueHelper(
UncommonField<HybridDictionary[]> dataField,
ref ItemStructList<ChildValueLookup> valueLookupList,
DependencyProperty dp,
DependencyObject container,
FrameworkObject child,
int childIndex,
bool styleLookup,
ref EffectiveValueEntry entry,
out ValueLookupType sourceType,
FrameworkElementFactory templateRoot)
{
Debug.Assert(child.IsValid, "child should either be an FE or an FCE");
object value = DependencyProperty.UnsetValue;
sourceType = ValueLookupType.Simple;
// Walk list backwards since highest priority lookup items are inserted last
for (int i = valueLookupList.Count - 1; i >= 0; i--)
{
sourceType = valueLookupList.List[i].LookupType;
// Lookup logic is determined by lookup type. "Trigger"
// is misleading right now because today it's also being used
// for Storyboard timeline lookups.
switch (valueLookupList.List[i].LookupType)
{
case ValueLookupType.Simple:
{
// Simple value
value = valueLookupList.List[i].Value;
}
break;
case ValueLookupType.Trigger:
case ValueLookupType.PropertyTriggerResource:
case ValueLookupType.DataTrigger:
case ValueLookupType.DataTriggerResource:
{
// Conditional value based on Container state
bool triggerMatch = true;
if( valueLookupList.List[i].Conditions != null )
{
// Check whether the trigger applies. All conditions must match,
// so the loop can terminate as soon as it finds a condition
// that doesn't match.
for (int j = 0; triggerMatch && j < valueLookupList.List[i].Conditions.Length; j++)
{
object state;
switch (valueLookupList.List[i].LookupType)
{
case ValueLookupType.Trigger:
case ValueLookupType.PropertyTriggerResource:
// Find the source node
DependencyObject sourceNode;
int sourceChildIndex = valueLookupList.List[i].Conditions[j].SourceChildIndex;
if (sourceChildIndex == 0)
{
sourceNode = container;
}
else
{
sourceNode = StyleHelper.GetChild(container, sourceChildIndex);
}
// Note that the sourceNode could be null when the source
// property for this trigger is on a node that hasn't been
// instantiated yet.
DependencyProperty sourceProperty = valueLookupList.List[i].Conditions[j].Property;
if (sourceNode != null)
{
state = sourceNode.GetValue(sourceProperty);
}
else
{
Type sourceNodeType;
if( templateRoot != null )
{
sourceNodeType = FindFEF(templateRoot, sourceChildIndex).Type;
}
else
{
sourceNodeType = (container as FrameworkElement).TemplateInternal.ChildTypeFromChildIndex[sourceChildIndex];
}
state = sourceProperty.GetDefaultValue(sourceNodeType);
}
triggerMatch = valueLookupList.List[i].Conditions[j].Match(state);
break;
case ValueLookupType.DataTrigger:
case ValueLookupType.DataTriggerResource:
default: // this cannot happen - but make the compiler happy
state = GetDataTriggerValue(dataField, container, valueLookupList.List[i].Conditions[j].Binding);
triggerMatch = valueLookupList.List[i].Conditions[j].ConvertAndMatch(state);
break;
}
}
}
if (triggerMatch)
{
// Conditionals matched, use the value
if (valueLookupList.List[i].LookupType == ValueLookupType.PropertyTriggerResource ||
valueLookupList.List[i].LookupType == ValueLookupType.DataTriggerResource)
{
// Resource lookup
object source;
value = FrameworkElement.FindResourceInternal(child.FE,
child.FCE,
dp,
valueLookupList.List[i].Value, // resourceKey
null, // unlinkedParent
true, // allowDeferredResourceReference
false, // mustReturnDeferredResourceReference
null, // boundaryElement
false, // disableThrowOnResourceNotFound
out source);
// Try to freeze the value
SealIfSealable(value);
}
else
{
value = valueLookupList.List[i].Value;
}
}
}
break;
case ValueLookupType.TemplateBinding:
{
TemplateBindingExtension templateBinding = (TemplateBindingExtension)valueLookupList.List[i].Value;
DependencyProperty sourceProperty = templateBinding.Property;
// Direct binding of Child property to Container
value = container.GetValue(sourceProperty);
// Apply the converter, if any
if (templateBinding.Converter != null)
{
DependencyProperty targetProperty = valueLookupList.List[i].Property;
System.Globalization.CultureInfo culture = child.Language.GetCompatibleCulture();
value = templateBinding.Converter.Convert(
value,
targetProperty.PropertyType,
templateBinding.ConverterParameter,
culture);
}
// if the binding returns an invalid value, fallback to default value
if ((value != DependencyProperty.UnsetValue) && !dp.IsValidValue(value))
{
value = DependencyProperty.UnsetValue;
}
}
break;
case ValueLookupType.Resource:
{
// Resource lookup
object source;
value = FrameworkElement.FindResourceInternal(
child.FE,
child.FCE,
dp,
valueLookupList.List[i].Value, // resourceKey
null, // unlinkedParent
true, // allowDeferredResourceReference
false, // mustReturnDeferredResourceReference
null, // boundaryElement
false, // disableThrowOnResourceNotFound
out source);
// Try to freeze the value
SealIfSealable(value);
}
break;
}
// See if value needs per-instance storage
if (value != DependencyProperty.UnsetValue)
{
entry.Value = value;
// When the value requires per-instance storage (and comes from this style),
// get the real value from per-instance data.
switch (valueLookupList.List[i].LookupType)
{
case ValueLookupType.Simple:
case ValueLookupType.Trigger:
case ValueLookupType.DataTrigger:
{
MarkupExtension me;
Freezable freezable;
if ((me = value as MarkupExtension) != null)
{
value = GetInstanceValue(
dataField,
container,
child.FE,
child.FCE,
childIndex,
valueLookupList.List[i].Property,
i,
ref entry);
}
else if ((freezable = value as Freezable) != null && !freezable.IsFrozen)
{
value = GetInstanceValue(
dataField,
container,
child.FE,
child.FCE,
childIndex,
valueLookupList.List[i].Property,
i,
ref entry);
}
}
break;
default:
break;
}
}
if (value != DependencyProperty.UnsetValue)
{
// Found a value, break out of the for() loop.
break;
}
}
return value;
}
// Given a Style/Template and a Binding whose value has changed, look for
// any data triggers that have trigger actions (EnterAction/ExitAction)
// and see if any of those actions need to run as a response to this change.
private static void InvokeApplicableDataTriggerActions(
Style style,
FrameworkTemplate frameworkTemplate,
DependencyObject container,
BindingBase binding,
BindingValueChangedEventArgs e,
UncommonField<HybridDictionary[]> dataField)
{
HybridDictionary dataTriggersWithActions;
if( style != null )
{
dataTriggersWithActions = style.DataTriggersWithActions;
}
else if( frameworkTemplate != null )
{
dataTriggersWithActions = frameworkTemplate.DataTriggersWithActions;
}
else
{
dataTriggersWithActions = null;
}
if( dataTriggersWithActions != null )
{
object candidateTrigger = dataTriggersWithActions[binding];
if( candidateTrigger != null )
{
// One or more trigger objects need to be evaluated. The candidateTrigger
// object may be a single trigger or a collection of them.
TriggerBase triggerBase = candidateTrigger as TriggerBase;
if( triggerBase != null )
{
InvokeDataTriggerActions( triggerBase, container, binding, e,
style, frameworkTemplate, dataField);
}
else
{
Debug.Assert(candidateTrigger is List<TriggerBase>, "Internal data structure error: The HybridDictionary [Style/Template].DataTriggersWithActions " +
"is expected to hold a single TriggerBase or a List<T> of them. An object of type " +
candidateTrigger.GetType().ToString() + " is not expected. Where did this object come from?");
List<TriggerBase> triggerList = (List<TriggerBase>)candidateTrigger;
for( int i = 0; i < triggerList.Count; i++ )
{
InvokeDataTriggerActions( triggerList[i], container, binding, e,
style, frameworkTemplate, dataField);
}
}
}
}
}
//
// This method
// 1. Retrieves a value from a binding in the condition of a data trigger
//
internal static object GetDataTriggerValue(
UncommonField<HybridDictionary[]> dataField,
DependencyObject container,
BindingBase binding)
{
// get the container's instance value list - the bindings are stored there
HybridDictionary[] data = dataField.GetValue(container);
HybridDictionary instanceValues = EnsureInstanceData(dataField, container, InstanceStyleData.InstanceValues);
// get the binding, creating it if necessary
BindingExpressionBase bindingExpr = (BindingExpressionBase)instanceValues[binding];
if (bindingExpr == null)
{
bindingExpr = BindingExpression.CreateUntargetedBindingExpression(container, binding);
instanceValues[binding] = bindingExpr;
if (dataField == StyleDataField)
{
bindingExpr.ValueChanged += new EventHandler<BindingValueChangedEventArgs>(OnBindingValueInStyleChanged);
}
else if (dataField == TemplateDataField)
{
bindingExpr.ResolveNamesInTemplate = true;
bindingExpr.ValueChanged += new EventHandler<BindingValueChangedEventArgs>(OnBindingValueInTemplateChanged);
}
else
{
Debug.Assert(dataField == ThemeStyleDataField);
bindingExpr.ValueChanged += new EventHandler<BindingValueChangedEventArgs>(OnBindingValueInThemeStyleChanged);
}
bindingExpr.Attach(container);
}
// get the value
return bindingExpr.Value;
}
// evaluate the current state of the trigger
internal override bool GetCurrentState(DependencyObject container, UncommonField<HybridDictionary[]> dataField)
{
Debug.Assert( TriggerConditions != null && TriggerConditions.Length == 1,
"This method assumes there is exactly one TriggerCondition." );
Debug.Assert( TriggerConditions[0].SourceChildIndex == 0,
"This method was created to handle properties on the containing object, more work is needed to handle templated children too." );
return TriggerConditions[0].Match(container.GetValue(TriggerConditions[0].Property));
}
//
// 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;
}
// ===========================================================================
// These methods are invoked to during a call call to
// FE.EnsureVisual or FCE.EnsureLogical
// ===========================================================================
#region InstantiateSubTree
//
// This method
// Creates the VisualTree
//
//[CodeAnalysis("AptcaMethodsShouldOnlyCallAptcaMethods")] //Tracking Bug: 29647
internal bool ApplyTemplateContent(
UncommonField<HybridDictionary[]> templateDataField,
FrameworkElement container)
{
#if STYLE_TRACE
_timer.Begin();
#endif
if (TraceDependencyProperty.IsEnabled)
{
TraceDependencyProperty.Trace(
TraceEventType.Start,
TraceDependencyProperty.ApplyTemplateContent,
container,
this);
}
ValidateTemplatedParent(container);
bool visualsCreated = StyleHelper.ApplyTemplateContent(templateDataField, container,
_templateRoot, _lastChildIndex,
ChildIndexFromChildName, this);
if (TraceDependencyProperty.IsEnabled)
{
TraceDependencyProperty.Trace(
TraceEventType.Stop,
TraceDependencyProperty.ApplyTemplateContent,
container,
this);
}
#if STYLE_TRACE
_timer.End();
if (visualsCreated)
{
string label = container.ID;
if (label == null || label.Length == 0)
label = container.GetHashCode().ToString();
Console.WriteLine(" Style.VT created for {0} {1} in {2:f2} msec",
container.GetType().Name, label, _timer.TimeOfLastPeriod);
}
#endif
return visualsCreated;
}
// This is expected to be called when a Binding for a DataTrigger has
// changed and we need to look for true/false transitions. If found,
// invoke EnterAction (or ExitAction) as needed.
private static void InvokeDataTriggerActions( TriggerBase triggerBase,
DependencyObject triggerContainer, BindingBase binding, BindingValueChangedEventArgs bindingChangedArgs,
Style style, FrameworkTemplate frameworkTemplate,
UncommonField<HybridDictionary[]> dataField)
{
bool oldState;
bool newState;
DataTrigger dataTrigger = triggerBase as DataTrigger;
if( dataTrigger != null )
{
EvaluateOldNewStates( dataTrigger, triggerContainer,
binding, bindingChangedArgs, dataField,
style, frameworkTemplate,
out oldState, out newState );
}
else
{
Debug.Assert( triggerBase is MultiDataTrigger,
"This method only handles DataTrigger and MultiDataTrigger. Other types should have been handled elsewhere." );
EvaluateOldNewStates( (MultiDataTrigger)triggerBase, triggerContainer,
binding, bindingChangedArgs, dataField,
style, frameworkTemplate,
out oldState, out newState );
}
InvokeEnterOrExitActions( triggerBase, oldState, newState, triggerContainer,
style, frameworkTemplate );
}
// evaluate the current state of the trigger
internal virtual bool GetCurrentState(DependencyObject container, UncommonField<HybridDictionary[]> dataField)
{
Debug.Assert( false,
"This method was written to handle Trigger, MultiTrigger, DataTrigger, and MultiDataTrigger. It looks like a new trigger type was added - please add support as appropriate.");
return false;
}
// Called from UpdateStyleCache - When an object's Style changes, some of
// the triggers contain EnterActions and they want to be run immediately
// if the trigger condition evaluates to true.
// Usually these EnterActions are to be run when there's a False->True
// transition. This code treats "true at time Style is applied" as
// a False->True transition even though it's possible no transition ever
// took place.
private static void ExecuteOnApplyEnterExitActions( FrameworkElement fe,
FrameworkContentElement fce, Style style, UncommonField<HybridDictionary[]> dataField )
{
// If the "Style Change" is the style being set to null - exit.
if( style == null )
{
return;
}
// Note: PropertyTriggersWithActions is a FrugalMap, so its count is checked against zero.
// DataTriggersWithActions is a HybridDictionary allocated on demand, so it's checked against null.
if( style.PropertyTriggersWithActions.Count == 0 && style.DataTriggersWithActions == null )
{
// Style has no trigger actions at all, exit.
return;
}
TriggerCollection triggers = style.Triggers;
DependencyObject triggerContainer = (fe != null) ? (DependencyObject)fe : (DependencyObject)fce;
ExecuteOnApplyEnterExitActionsLoop( triggerContainer, triggers, style, null, dataField );
}
// evaluate the current state of the trigger
internal override bool GetCurrentState(DependencyObject container, UncommonField<HybridDictionary[]> dataField)
{
bool retVal = (TriggerConditions.Length > 0);
for( int i = 0; retVal && i < TriggerConditions.Length; i++ )
{
retVal = TriggerConditions[i].ConvertAndMatch(StyleHelper.GetDataTriggerValue(dataField, container, TriggerConditions[i].Binding));
}
return retVal;
}
// ===========================================================================
// These methods are invoked when a visual tree is
// being created/destroyed via a Style/Template and
// when a Style/Template is being applied or
// unapplied to a FE/FCE
// ===========================================================================
#region WriteInstanceData
//
// This method
// 1. Is called whenever a Style/Template is [un]applied to an FE/FCE
// 2. It updates the per-instance StyleData/TemplateData
//
internal static void UpdateInstanceData(
UncommonField<HybridDictionary[]> dataField,
FrameworkElement fe,
FrameworkContentElement fce,
Style oldStyle,
Style newStyle,
FrameworkTemplate oldFrameworkTemplate,
FrameworkTemplate newFrameworkTemplate,
InternalFlags hasGeneratedSubTreeFlag)
{
Debug.Assert((fe != null && fce == null) || (fe == null && fce != null));
DependencyObject container = (fe != null) ? (DependencyObject)fe : (DependencyObject)fce;
if (oldStyle != null || oldFrameworkTemplate != null )
{
ReleaseInstanceData(dataField, container, fe, fce, oldStyle, oldFrameworkTemplate, hasGeneratedSubTreeFlag);
}
if (newStyle != null || newFrameworkTemplate != null )
{
CreateInstanceData(dataField, container, fe, fce, newStyle, newFrameworkTemplate );
}
else
{
dataField.ClearValue(container);
}
}
