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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/***************************************************************************\
*
*
* Dictionary that holds Resources for Framework components.
*
*
\***************************************************************************/
using System.IO;
using System.Net;
using System.Collections;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Windows.Threading;
using System.Windows.Media;
using System.Windows.Diagnostics;
using MS.Internal;
using MS.Internal.Utility;
using MS.Internal.AppModel;
using System.Xaml;
using System.Windows.Baml2006;
using System.Windows.Markup;
namespace System.Windows
{
/// <summary>
/// Dictionary that holds Resources for Framework components.
/// </summary>
[Localizability(LocalizationCategory.Ignore)]
[Ambient]
[UsableDuringInitialization(true)]
public class ResourceDictionary : IDictionary, ISupportInitialize, System.Windows.Markup.IUriContext, System.Windows.Markup.INameScope
{
#region Constructor
/// <summary>
/// Constructor for ResourceDictionary
/// </summary>
public ResourceDictionary()
{
_baseDictionary = new Hashtable();
IsThemeDictionary = SystemResources.IsSystemResourcesParsing;
}
static ResourceDictionary()
{
DummyInheritanceContext.DetachFromDispatcher();
}
#endregion Constructor
#region PublicAPIs
/// <summary>
/// Copies the dictionary's elements to a one-dimensional
/// Array instance at the specified index.
/// </summary>
/// <param name="array">
/// The one-dimensional Array that is the destination of the
/// DictionaryEntry objects copied from Hashtable. The Array
/// must have zero-based indexing.
/// </param>
/// <param name="arrayIndex">
/// The zero-based index in array at which copying begins.
/// </param>
public void CopyTo(DictionaryEntry[] array, int arrayIndex)
{
if (CanBeAccessedAcrossThreads)
{
lock(((ICollection)this).SyncRoot)
{
CopyToWithoutLock(array, arrayIndex);
}
}
else
{
CopyToWithoutLock(array, arrayIndex);
}
}
private void CopyToWithoutLock(DictionaryEntry[] array, int arrayIndex)
{
ArgumentNullException.ThrowIfNull(array);
_baseDictionary.CopyTo(array, arrayIndex);
int length = arrayIndex + Count;
for (int i = arrayIndex; i < length; i++)
{
DictionaryEntry entry = array[i];
object value = entry.Value;
bool canCache;
OnGettingValuePrivate(entry.Key, ref value, out canCache);
entry.Value = value; // refresh the entry value in case it was changed in the previous call
}
}
// This is set when the RD is loaded from unsafe xps doc. This will be checked while creating reader for RD source.
internal bool IsUnsafe { get; set; }
///<summary>
/// List of ResourceDictionaries merged into this Resource Dictionary
///</summary>
public Collection<ResourceDictionary> MergedDictionaries
{
get
{
if (_mergedDictionaries == null)
{
_mergedDictionaries = new ResourceDictionaryCollection(this);
_mergedDictionaries.CollectionChanged += OnMergedDictionariesChanged;
}
return _mergedDictionaries;
}
}
///<summary>
/// Uri to load this resource from, it will clear the current state of the ResourceDictionary
///</summary>
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public Uri Source
{
get
{
return _source;
}
set
{
if (value == null || String.IsNullOrEmpty(value.OriginalString))
{
throw new ArgumentException(SR.Format(SR.ResourceDictionaryLoadFromFailure, value == null ? "''" : value.ToString()));
}
ResourceDictionaryDiagnostics.RemoveResourceDictionaryForUri(_source, this);
ResourceDictionarySourceUriWrapper uriWrapper = value as ResourceDictionarySourceUriWrapper;
Uri sourceUri;
// If the Uri we received is a ResourceDictionarySourceUriWrapper it means
// that it is being passed down by the Baml parsing code, and it is trying to give us more
// information to avoid possible ambiguities in assembly resolving. Use the VersionedUri
// to resolve, and the set _source to the OriginalUri so we don't change the return of Source property.
// The versioned Uri is not stored, if the version info is needed while debugging, once this method
// returns _reader should be set, from there BamlSchemaContext.LocalAssembly contains the version info.
if (uriWrapper == null)
{
_source = value;
sourceUri = _source;
}
else
{
_source = uriWrapper.OriginalUri;
sourceUri = uriWrapper.VersionedUri;
}
Clear();
Uri uri = BindUriHelper.GetResolvedUri(_baseUri, sourceUri);
WebRequest request = WpfWebRequestHelper.CreateRequest(uri);
WpfWebRequestHelper.ConfigCachePolicy(request, false);
ContentType contentType = null;
Stream s = null;
try
{
s = WpfWebRequestHelper.GetResponseStream(request, out contentType);
}
catch (System.IO.IOException)
{
if (IsSourcedFromThemeDictionary)
{
switch (_fallbackState)
{
case FallbackState.Classic:
{
_fallbackState = FallbackState.Generic;
Uri classicResourceUri = ThemeDictionaryExtension.GenerateFallbackUri(this, SystemResources.ClassicResourceName);
Debug.Assert(classicResourceUri != null);
Source = classicResourceUri;
// After this recursive call has returned we are sure
// that we have tried all fallback paths and so now
// reset the _fallbackState
_fallbackState = FallbackState.Classic;
}
break;
case FallbackState.Generic:
{
_fallbackState = FallbackState.None;
Uri genericResourceUri = ThemeDictionaryExtension.GenerateFallbackUri(this, SystemResources.GenericResourceName);
Debug.Assert(genericResourceUri != null);
Source = genericResourceUri;
}
break;
}
return;
}
else
{
throw;
}
}
// MimeObjectFactory.GetObjectAndCloseStream will try to find the object converter basing on the mime type.
// It can be a sync/async converter. It's the converter's responsiblity to close the stream.
// If it fails to find a convert, this call will return null.
System.Windows.Markup.XamlReader asyncObjectConverter;
ResourceDictionary loadedRD = MimeObjectFactory.GetObjectAndCloseStreamCore(s, contentType, uri, false, false, false /*allowAsync*/, false /*isJournalNavigation*/, out asyncObjectConverter, IsUnsafe)
as ResourceDictionary;
if (loadedRD == null)
{
throw new InvalidOperationException(SR.Format(SR.ResourceDictionaryLoadFromFailure, _source.ToString()));
}
// ReferenceCopy all the key-value pairs in the _baseDictionary
_baseDictionary = loadedRD._baseDictionary;
// ReferenceCopy all the entries in the MergedDictionaries collection
_mergedDictionaries = loadedRD._mergedDictionaries;
// ReferenceCopy all of the deferred content state
CopyDeferredContentFrom(loadedRD);
// Take over the deferred resource references
MoveDeferredResourceReferencesFrom(loadedRD);
// Copy over the HasImplicitStyles flag
HasImplicitStyles = loadedRD.HasImplicitStyles;
// Copy over the HasImplicitDataTemplates flag
HasImplicitDataTemplates = loadedRD.HasImplicitDataTemplates;
// Copy over the InvalidatesImplicitDataTemplateResources flag
InvalidatesImplicitDataTemplateResources = loadedRD.InvalidatesImplicitDataTemplateResources;
// Set inheritance context on the copied values
if (InheritanceContext != null)
{
AddInheritanceContextToValues();
}
// Propagate parent owners to each of the acquired merged dictionaries
if (_mergedDictionaries != null)
{
for (int i = 0; i < _mergedDictionaries.Count; i++)
{
PropagateParentOwners(_mergedDictionaries[i]);
}
}
ResourceDictionaryDiagnostics.AddResourceDictionaryForUri(uri, this);
if (!IsInitializePending)
{
// Fire Invalidations for the changes made by asigning a new Source
NotifyOwners(new ResourcesChangeInfo(null, this));
}
}
}
#region INameScope
/// <summary>
/// Registers the name - element combination
/// </summary>
/// <param name="name">name of the element</param>
/// <param name="scopedElement">Element where name is defined</param>
public void RegisterName(string name, object scopedElement)
{
throw new NotSupportedException(SR.NamesNotSupportedInsideResourceDictionary);
}
/// <summary>
/// Unregisters the name - element combination
/// </summary>
/// <param name="name">Name of the element</param>
public void UnregisterName(string name)
{
// Do Nothing as Names cannot be registered on ResourceDictionary
}
/// <summary>
/// Find the element given name
/// </summary>
/// <param name="name">Name of the element</param>
/// <returns>null always</returns>
public object FindName(string name)
{
return null;
}
#endregion INameScope
#region IUriContext
/// <summary>
/// Accessor for the base uri of the ResourceDictionary
/// </summary>
Uri System.Windows.Markup.IUriContext.BaseUri
{
get
{
return _baseUri;
}
set
{
_baseUri = value;
}
}
#endregion IUriContext
#endregion PublicAPIs
#region IDictionary
/// <summary>
/// Gets a value indicating whether the IDictionary has a fixed size.
/// </summary>
public bool IsFixedSize
{
get { return _baseDictionary.IsFixedSize; }
}
/// <summary>
/// Gets a value indicating whether the ResourceDictionary is read-only.
/// </summary>
public bool IsReadOnly
{
get { return ReadPrivateFlag(PrivateFlags.IsReadOnly); }
internal set
{
WritePrivateFlag(PrivateFlags.IsReadOnly, value);
if (value == true)
{
// Seal all the styles and templates in this dictionary
SealValues();
}
// Set all the merged resource dictionaries as ReadOnly
if (_mergedDictionaries != null)
{
for (int i = 0; i < _mergedDictionaries.Count; i++)
{
_mergedDictionaries[i].IsReadOnly = value;
}
}
}
}
/// <summary>
/// Gets or sets a value indicating whether the invalidations fired
/// by the ResourceDictionary when an implicit data template resource
/// changes will cause ContentPresenters to re-evaluate their choice
/// of template.
/// </summary>
[DefaultValue(false)]
public bool InvalidatesImplicitDataTemplateResources
{
get { return ReadPrivateFlag(PrivateFlags.InvalidatesImplicitDataTemplateResources); }
set { WritePrivateFlag(PrivateFlags.InvalidatesImplicitDataTemplateResources, value); }
}
/// <summary>
/// Gets or sets the value associated with the specified key.
/// </summary>
/// <remarks>
/// Fire Invalidations only for changes made after the Init Phase
/// If the key is not found on this ResourceDictionary, it will look on any MergedDictionaries for it
/// </remarks>
public object this[object key]
{
get
{
bool canCache;
return GetValue(key, out canCache);
}
set
{
// Seal styles and templates within App and Theme dictionary
SealValue(value);
if (CanBeAccessedAcrossThreads)
{
lock(((ICollection)this).SyncRoot)
{
SetValueWithoutLock(key, value);
}
}
else
{
SetValueWithoutLock(key, value);
}
}
}
// This should only be called in the deferred BAML loading scenario. We
// cache all the data that we need away and then get rid of the actual object.
// No one needs to actually get this property so we're returning null. This
// property has to be public since the XAML parser cannot set this internal
// property in this scenario.
[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public DeferrableContent DeferrableContent
{
get
{
return null;
}
set
{
this.SetDeferrableContent(value);
}
}
private void SetValueWithoutLock(object key, object value)
{
if (IsReadOnly)
{
throw new InvalidOperationException(SR.ResourceDictionaryIsReadOnly);
}
object oldValue = _baseDictionary[key];
if (oldValue != value)
{
// We need to validate all the deferred references that refer
// to the old resource before we overwrite it.
ValidateDeferredResourceReferences(key);
if( TraceResourceDictionary.IsEnabled )
{
TraceResourceDictionary.Trace( TraceEventType.Start,
TraceResourceDictionary.AddResource,
this,
key,
value );
}
_baseDictionary[key] = value;
// Update the HasImplicitStyles flag
UpdateHasImplicitStyles(key);
// Update the HasImplicitDataTemplates flag
UpdateHasImplicitDataTemplates(key);
// Notify owners of the change and fire invalidate if already initialized
NotifyOwners(new ResourcesChangeInfo(key));
if( TraceResourceDictionary.IsEnabled )
{
TraceResourceDictionary.Trace(
TraceEventType.Stop,
TraceResourceDictionary.AddResource,
this,
key,
value );
}
}
}
internal object GetValue(object key, out bool canCache)
{
if (CanBeAccessedAcrossThreads)
{
lock(((ICollection)this).SyncRoot)
{
return GetValueWithoutLock(key, out canCache);
}
}
else
{
return GetValueWithoutLock(key, out canCache);
}
}
private object GetValueWithoutLock(object key, out bool canCache)
{
object value = _baseDictionary[key];
if (value != null)
{
OnGettingValuePrivate(key, ref value, out canCache);
}
else
{
canCache = true;
//Search for the value in the Merged Dictionaries
if (_mergedDictionaries != null)
{
for (int i = MergedDictionaries.Count - 1; (i > -1); i--)
{
// Note that MergedDictionaries collection can also contain null values
ResourceDictionary mergedDictionary = MergedDictionaries[i];
if (mergedDictionary != null)
{
value = mergedDictionary.GetValue(key, out canCache);
if (value != null)
{
break;
}
}
}
}
}
return value;
}
// Gets the type of the value stored at the given key
internal Type GetValueType(object key, out bool found)
{
found = false;
Type valueType = null;
object value = _baseDictionary[key];
if (value != null)
{
found = true;
KeyRecord keyRecord = value as KeyRecord;
if (keyRecord != null)
{
Debug.Assert(_numDefer > 0, "The stream was closed before all deferred content was loaded.");
valueType = GetTypeOfFirstObject(keyRecord);
}
else
{
valueType = value.GetType();
}
}
else
{
// Search for the value in the Merged Dictionaries
if (_mergedDictionaries != null)
{
for (int i = MergedDictionaries.Count - 1; (i > -1); i--)
{
// Note that MergedDictionaries collection can also contain null values
ResourceDictionary mergedDictionary = MergedDictionaries[i];
if (mergedDictionary != null)
{
valueType = mergedDictionary.GetValueType(key, out found);
if (found)
{
break;
}
}
}
}
}
return valueType;
}
/// <summary>
/// Gets a copy of the ICollection containing the keys of the IDictionary.
/// </summary>
public ICollection Keys
{
get
{
object[] keysCollection = new object[Count];
_baseDictionary.Keys.CopyTo(keysCollection, 0);
return keysCollection;
}
}
/// <summary>
/// Gets an ICollection containing the values in the Hashtable
/// </summary>
/// <value>An ICollection containing the values in the Hashtable</value>
public ICollection Values
{
get
{
return new ResourceValuesCollection(this);
}
}
/// <summary>
/// Adds an entry
/// </summary>
/// <remarks>
/// Fire Invalidations only for changes made after the Init Phase
/// </remarks>
public void Add(object key, object value)
{
// Seal styles and templates within App and Theme dictionary
SealValue(value);
if (CanBeAccessedAcrossThreads)
{
lock(((ICollection)this).SyncRoot)
{
AddWithoutLock(key, value);
}
}
else
{
AddWithoutLock(key, value);
}
}
private void AddWithoutLock(object key, object value)
{
if (IsReadOnly)
{
throw new InvalidOperationException(SR.ResourceDictionaryIsReadOnly);
}
// invalid during a VisualTreeChanged event
System.Windows.Diagnostics.VisualDiagnostics.VerifyVisualTreeChange(InheritanceContext);
if( TraceResourceDictionary.IsEnabled )
{
TraceResourceDictionary.Trace( TraceEventType.Start,
TraceResourceDictionary.AddResource,
this,
key,
value );
}
_baseDictionary.Add(key, value);
// Update the HasImplicitKey flag
UpdateHasImplicitStyles(key);
// Update the HasImplicitDataTemplates flag
UpdateHasImplicitDataTemplates(key);
// Notify owners of the change and fire invalidate if already initialized
NotifyOwners(new ResourcesChangeInfo(key));
if( TraceResourceDictionary.IsEnabled )
{
TraceResourceDictionary.Trace( TraceEventType.Stop,
TraceResourceDictionary.AddResource,
this,
key,
value );
}
}
/// <summary>
/// Removes all elements from the IDictionary.
/// </summary>
public void Clear()
{
if (CanBeAccessedAcrossThreads)
{
lock(((ICollection)this).SyncRoot)
{
ClearWithoutLock();
}
}
else
{
ClearWithoutLock();
}
}
private void ClearWithoutLock()
{
if (IsReadOnly)
{
throw new InvalidOperationException(SR.ResourceDictionaryIsReadOnly);
}
// invalid during a VisualTreeChanged event
System.Windows.Diagnostics.VisualDiagnostics.VerifyVisualTreeChange(InheritanceContext);
if (Count > 0)
{
// We need to validate all the deferred references that refer
// to the old resource before we clear it.
ValidateDeferredResourceReferences(null);
// remove inheritance context from all values that got it from
// this dictionary
RemoveInheritanceContextFromValues();
_baseDictionary.Clear();
// Notify owners of the change and fire invalidate if already initialized
NotifyOwners(ResourcesChangeInfo.CatastrophicDictionaryChangeInfo);
}
}
/// <summary>
/// Determines whether the IDictionary contains an element with the specified key.
/// if the Key is not contained in this ResourceDictionary, it will check in the MergedDictionaries too
/// </summary>
public bool Contains(object key)
{
bool result = _baseDictionary.Contains(key);
if (result)
{
KeyRecord keyRecord = _baseDictionary[key] as KeyRecord;
if (keyRecord != null && _deferredLocationList.Contains(keyRecord))
{
return false;
}
}
//Search for the value in the Merged Dictionaries
if (_mergedDictionaries != null)
{
for (int i = MergedDictionaries.Count - 1; (i > -1) && !result; i--)
{
// Note that MergedDictionaries collection can also contain null values
ResourceDictionary mergedDictionary = MergedDictionaries[i];
if (mergedDictionary != null)
{
result = mergedDictionary.Contains(key);
}
}
}
return result;
}
/// <summary>
/// Determines whether the IDictionary contains a BamlObjectFactory against the specified key.
/// if the Key is not contained in this ResourceDictionary, it will check in the MergedDictionaries too
/// </summary>
private bool ContainsBamlObjectFactory(object key)
{
return GetBamlObjectFactory(key) != null;
}
/// <summary>
/// Retrieves a KeyRecord from the IDictionary using the specified key.
/// If the Key is not contained in this ResourceDictionary, it will check in the MergedDictionaries too
/// </summary>
private KeyRecord GetBamlObjectFactory(object key)
{
if (_baseDictionary.Contains(key))
{
return _baseDictionary[key] as KeyRecord;
}
//Search for the value in the Merged Dictionaries
if (_mergedDictionaries != null)
{
for (int i = MergedDictionaries.Count - 1; i > -1; i--)
{
// Note that MergedDictionaries collection can also contain null values
ResourceDictionary mergedDictionary = MergedDictionaries[i];
if (mergedDictionary != null)
{
KeyRecord keyRecord = mergedDictionary.GetBamlObjectFactory(key);
if (keyRecord != null)
{
return keyRecord;
}
}
}
}
return null;
}
/// <summary>
/// Returns an IDictionaryEnumerator that can iterate through the Hashtable
/// </summary>
/// <returns>An IDictionaryEnumerator for the Hashtable</returns>
public IDictionaryEnumerator GetEnumerator()
{
return new ResourceDictionaryEnumerator(this);
}
/// <summary>
/// Removes an entry
/// </summary>
/// <remarks>
/// Fire Invalidations only for changes made after the Init Phase
/// </remarks>
public void Remove(object key)
{
if (CanBeAccessedAcrossThreads)
{
lock(((ICollection)this).SyncRoot)
{
RemoveWithoutLock(key);
}
}
else
{
RemoveWithoutLock(key);
}
}
private void RemoveWithoutLock(object key)
{
if (IsReadOnly)
{
throw new InvalidOperationException(SR.ResourceDictionaryIsReadOnly);
}
// invalid during a VisualTreeChanged event
System.Windows.Diagnostics.VisualDiagnostics.VerifyVisualTreeChange(InheritanceContext);
// We need to validate all the deferred references that refer
// to the old resource before we remove it.
ValidateDeferredResourceReferences(key);
// remove the inheritance context from the value, if it came from
// this dictionary
RemoveInheritanceContext(_baseDictionary[key]);
_baseDictionary.Remove(key);
// Notify owners of the change and fire invalidate if already initialized
NotifyOwners(new ResourcesChangeInfo(key));
}
#endregion IDictionary
#region ICollection
/// <summary>
/// Gets the number of elements contained in the ICollection.
/// </summary>
public int Count
{
get { return _baseDictionary.Count; }
}
/// <summary>
/// Gets a value indicating whether access to the ICollection is synchronized (thread-safe).
/// </summary>
bool ICollection.IsSynchronized
{
get { return _baseDictionary.IsSynchronized; }
}
/// <summary>
/// Gets an object that can be used to synchronize access to the ICollection.
/// </summary>
object ICollection.SyncRoot
{
get
{
if (CanBeAccessedAcrossThreads)
{
// Notice that we are acquiring the ThemeDictionaryLock. This
// is because the _parserContext used for template expansion
// shares data-structures such as the BamlMapTable and
// XamlTypeMapper with the parent ParserContext that was used
// to build the template in the first place. So if this template
// is from the App.Resources then the ParserContext that is used for
// loading deferred content in the app dictionary and the
// _parserContext used to load template content share the same
// instances of BamlMapTable and XamlTypeMapper. Hence we need to
// make sure that we lock on the same object inorder to serialize
// access to these data-structures in multi-threaded scenarios.
// Look at comment in Frameworktemplate.LoadContent to understand
// why we use the ThemeDictionaryLock for template expansion.
return SystemResources.ThemeDictionaryLock;
}
else
{
return _baseDictionary.SyncRoot;
}
}
}
/// <summary>
/// Copies the dictionary's elements to a one-dimensional
/// Array instance at the specified index.
/// </summary>
/// <param name="array">
/// The one-dimensional Array that is the destination of the
/// DictionaryEntry objects copied from Hashtable. The Array
/// must have zero-based indexing.
/// </param>
/// <param name="arrayIndex">
/// The zero-based index in array at which copying begins.
/// </param>
void ICollection.CopyTo(Array array, int arrayIndex)
{
CopyTo(array as DictionaryEntry[], arrayIndex);
}
#endregion ICollection
#region IEnumerable
IEnumerator IEnumerable.GetEnumerator()
{
return ((IDictionary)this).GetEnumerator();
}
#endregion IEnumerable
#region ISupportInitialize
/// <summary>
/// Mark the begining of the Init phase
/// </summary>
/// <remarks>
/// BeginInit and EndInit follow a transaction model. BeginInit marks the
/// dictionary uninitialized and EndInit marks it initialized.
/// </remarks>
public void BeginInit()
{
// Nested BeginInits on the same instance aren't permitted
if (IsInitializePending)
{
throw new InvalidOperationException(SR.NestedBeginInitNotSupported);
}
IsInitializePending = true;
IsInitialized = false;
}
/// <summary>
/// Fire Invalidation at the end of Init phase
/// </summary>
/// <remarks>
/// BeginInit and EndInit follow a transaction model. BeginInit marks the
/// dictionary uninitialized and EndInit marks it initialized.
/// </remarks>
public void EndInit()
{
// EndInit without a BeginInit isn't permitted
if (!IsInitializePending)
{
throw new InvalidOperationException(SR.EndInitWithoutBeginInitNotSupported);
}
Debug.Assert(IsInitialized == false, "Dictionary should not be initialized when EndInit is called");
IsInitializePending = false;
IsInitialized = true;
// Fire Invalidations collectively for all changes made during the Init Phase
NotifyOwners(new ResourcesChangeInfo(null, this));
}
#endregion ISupportInitialize
#region DeferContent
private bool CanCache(KeyRecord keyRecord, object value)
{
if (keyRecord.SharedSet)
{
return keyRecord.Shared;
}
else
{
return true;
}
}
private void OnGettingValuePrivate(object key, ref object value, out bool canCache)
{
// diagnostic agent may want to know when a StaticResource reference
// resolves. Do this before calling out to OnGettingValue, as that
// can inflate deferred content and cause nested requests
ResourceDictionaryDiagnostics.RecordLookupResult(key, this);
OnGettingValue(key, ref value, out canCache);
if (key != null && canCache)
{
if (!Object.Equals(_baseDictionary[key], value))
{
// cache the revised value, after setting its InheritanceContext
if (InheritanceContext != null)
{
AddInheritanceContext(InheritanceContext, value);
}
_baseDictionary[key] = value;
}
}
}
protected virtual void OnGettingValue(object key, ref object value, out bool canCache)
{
KeyRecord keyRecord = value as KeyRecord;
// If the value is not a key record then
// it has already been realized, is not deferred and is a "ready to go" value.
if (keyRecord == null)
{
canCache = true;
return; /* Not deferred content */
}
Debug.Assert(_numDefer > 0, "The stream was closed before all deferred content was loaded.");
// We want to return null if a resource asks for itself. It should return null
// <Style x:Key={x:Type Button} BasedOn={StaticResource {x:Type Button}}/> should not find itself
if (_deferredLocationList.Contains(keyRecord))
{
canCache = false;
value = null;
return; /* Not defered content */
}
_deferredLocationList.Add(keyRecord);
try
{
if (TraceResourceDictionary.IsEnabled)
{
TraceResourceDictionary.Trace(
TraceEventType.Start,
TraceResourceDictionary.RealizeDeferContent,
this,
key,
value);
}
value = CreateObject(keyRecord);
}
finally
{
if (TraceResourceDictionary.IsEnabled)
{
TraceResourceDictionary.Trace(
TraceEventType.Stop,
TraceResourceDictionary.RealizeDeferContent,
this,
key,
value);
}
}
_deferredLocationList.Remove(keyRecord);
if (key != null)
{
canCache = CanCache(keyRecord, value);
if (canCache)
{
// Seal styles and templates within App and Theme dictionary
SealValue(value);
_numDefer--;
if (_numDefer == 0)
{
CloseReader();
}
}
}
else
{
canCache = true;
}
}
/// <summary>
/// Add a byte array that contains deferable content
/// </summary>
private void SetDeferrableContent(DeferrableContent deferrableContent)
{
Debug.Assert(deferrableContent.Stream != null);
Debug.Assert(deferrableContent.SchemaContext != null);
Debug.Assert(deferrableContent.ObjectWriterFactory != null);
Debug.Assert(deferrableContent.ServiceProvider != null);
Debug.Assert(deferrableContent.RootObject != null);
Baml2006ReaderSettings settings = new Baml2006ReaderSettings(deferrableContent.SchemaContext.Settings);
settings.IsBamlFragment = true;
settings.OwnsStream = true;
settings.BaseUri = null; // Base URI can only be set on the root object, not on deferred content.
Baml2006Reader reader = new Baml2006Reader(deferrableContent.Stream,
deferrableContent.SchemaContext, settings);
_objectWriterFactory = deferrableContent.ObjectWriterFactory;
_objectWriterSettings = deferrableContent.ObjectWriterParentSettings;
_deferredLocationList = new List<KeyRecord>();
_rootElement = deferrableContent.RootObject;
IList<KeyRecord> keys = reader.ReadKeys();
// If we already have the Source set then we can ignore
// this deferable content section
if (_source == null)
{
if (_reader == null)
{
_reader = reader;
SetKeys(keys, deferrableContent.ServiceProvider);
}
else
{
throw new InvalidOperationException(SR.ResourceDictionaryDuplicateDeferredContent);
}
}
else if (keys.Count > 0)
{
throw new InvalidOperationException(SR.ResourceDictionaryDeferredContentFailure);
}
}
private object GetKeyValue(KeyRecord key, IServiceProvider serviceProvider)
{
if (key.KeyString != null)
{
return key.KeyString;
}
else if (key.KeyType != null)
{
return key.KeyType;
}
else
{
System.Xaml.XamlReader reader = key.KeyNodeList.GetReader();
object value = EvaluateMarkupExtensionNodeList(reader, serviceProvider);
return value;
}
}
private object EvaluateMarkupExtensionNodeList(System.Xaml.XamlReader reader, IServiceProvider serviceProvider)
{
System.Xaml.XamlObjectWriter writer = _objectWriterFactory.GetXamlObjectWriter(null);
System.Xaml.XamlServices.Transform(reader, writer);
object value = writer.Result;
MarkupExtension me = value as MarkupExtension;
if (me != null)
{
value = me.ProvideValue(serviceProvider);
}
return value;
}
private object GetStaticResourceKeyValue(StaticResource staticResource, IServiceProvider serviceProvider)
{
System.Xaml.XamlReader reader = staticResource.ResourceNodeList.GetReader();
XamlType xamlTypeStaticResourceExtension = reader.SchemaContext.GetXamlType(typeof(StaticResourceExtension));
XamlMember xamlMemberResourceKey = xamlTypeStaticResourceExtension.GetMember("ResourceKey");
reader.Read();
if (reader.NodeType == Xaml.XamlNodeType.StartObject && reader.Type == xamlTypeStaticResourceExtension)
{
reader.Read();
// Skip Members that aren't _PositionalParameters or ResourceKey
while (reader.NodeType == Xaml.XamlNodeType.StartMember &&
(reader.Member != XamlLanguage.PositionalParameters && reader.Member != xamlMemberResourceKey))
{
reader.Skip();
}
// Process the Member Value of _PositionParameters or ResourceKey
if (reader.NodeType == Xaml.XamlNodeType.StartMember)
{
object value = null;
reader.Read();
if (reader.NodeType == Xaml.XamlNodeType.StartObject)
{
System.Xaml.XamlReader subReader = reader.ReadSubtree();
value = EvaluateMarkupExtensionNodeList(subReader, serviceProvider);
}
else if (reader.NodeType == Xaml.XamlNodeType.Value)
{
value = reader.Value;
}
return value;
}
}
return null;
}
private void SetKeys(IList<KeyRecord> keyCollection, IServiceProvider serviceProvider)
{
_numDefer = keyCollection.Count;
// Allocate one StaticResourceExtension object to use as a "worker".
StaticResourceExtension staticResourceWorker = new StaticResourceExtension();
// Use the array Count property to avoid range checking inside the loop
for (int i = 0; i < keyCollection.Count; i++)
{
KeyRecord keyRecord = keyCollection[i];
if (keyRecord != null)
{
object value = GetKeyValue(keyRecord, serviceProvider);
// Update the HasImplicitStyles flag
UpdateHasImplicitStyles(value);
// Update the HasImplicitDataTemplates flag
UpdateHasImplicitDataTemplates(value);
if (keyRecord != null && keyRecord.HasStaticResources)
{
SetOptimizedStaticResources(keyRecord.StaticResources, serviceProvider, staticResourceWorker);
}
_baseDictionary.Add(value, keyRecord);
if (TraceResourceDictionary.IsEnabled)
{
TraceResourceDictionary.TraceActivityItem(
TraceResourceDictionary.SetKey,
this,
value);
}
}
else
{
throw new ArgumentException(SR.KeyCollectionHasInvalidKey);
}
}
// Notify owners of the HasImplicitStyles flag value
// but there is not need to fire an invalidation.
NotifyOwners(new ResourcesChangeInfo(null, this));
}
/// <summary>
/// Convert the OptimizedStaticResource and StaticResource items into StaticResourceHolders.
/// A StaticResourceHolder is derived from StaticResourceExtension and is a MarkupExtension.
/// The differences is that it contain a DeferredResourceReference as its "PrefetchedValue".
/// DeferredResourceReferences hold the dictionary and the key of the resource. It is a
/// way of looking up the reference now (for later use) but not expanding the entry.
/// Also the dictionary has a reference back to the Deferrred Reference. If dictionary entry
/// is modifed the DeferredResourceReference is told and it will grab the old value.
/// StaticResourceHolder is a MarkupExtension and thus can be returned as a "Value" in the Node Stream.
///
/// Issue: If there is a ResourceDictionary inside the deferred entry, the entries inside that
/// RD will not be evaluated when resolving DeferredResourceReferences for a key in that same entry.
/// Thus the OptimizedStaticResource will either be erronously "not found" or may even map to some
/// incorrect value higher in the parse tree. So... In StaticResourceExtension.ProvideValue()
/// when we have a DeferredResourceReference we search the Deferred Content for a better
/// closer value before using the DeferredReference.
/// See StaticResourceExtension.FindTheResourceDictionary() for more details.
/// </summary>
// As a memory optimization this method is passed a staticResourceExtension instance to use as
// a worker when calling TryProvideValueInternal, which saves us having to allocate on every call.
private void SetOptimizedStaticResources(IList<object> staticResources, IServiceProvider serviceProvider, StaticResourceExtension staticResourceWorker)
{
Debug.Assert(staticResources != null && staticResources.Count > 0);
for (int i = 0; i < staticResources.Count; i++)
{
object keyValue = null;
// Process OptimizedStaticResource
var optimizedStaticResource = staticResources[i] as OptimizedStaticResource;
if (optimizedStaticResource != null)
{
keyValue = optimizedStaticResource.KeyValue;
}
else
{
// Process StaticResource (it holds the NodeList of the StaticResourceExtension)
var staticResource = staticResources[i] as StaticResource;
if (staticResource != null)
{
// find and evaluate the Key value of the SR in the SR's node stream.
keyValue = GetStaticResourceKeyValue(staticResource, serviceProvider);
Debug.Assert(keyValue != null, "Didn't find the ResourceKey property or x:PositionalParameters directive");
}
else
{
Debug.Assert(false, "StaticResources[] entry is not a StaticResource not OptimizedStaticResource");
continue; // other types of entries are not processed.
}
}
// Lookup the Key in the current context. [And return a Deferred Reference Holding SR to it]
// The current context is the Key table at the top of the Compiled Dictionary.
// We will look at keys above us in this dictionary and in the dictionaries in objects above
// us on the parse stack. And then look in the App and System Themems.
// This isn't always good enough. The Static Resource referenced inside the entry may refer
// to a entry in a sub-dictionary inside the deferred entry. There is other code, later
// when evaluating StaticResourceHolders, that does an search of the part that is missed here.
staticResourceWorker.ResourceKey = keyValue;
object obj = staticResourceWorker.TryProvideValueInternal(serviceProvider, true /*allowDeferredReference*/, true /* mustReturnDeferredResourceReference */);
Debug.Assert(obj is DeferredResourceReference);
staticResources[i] = new StaticResourceHolder(keyValue, obj as DeferredResourceReference);
}
}
#if false
// need to call this (and do similar for Template) to cache RDs.
private void SetStaticResources(object[] staticResourceValues, ParserContext context)
{
if (staticResourceValues != null && staticResourceValues.Length > 0)
{
bool inDeferredSection = context.InDeferredSection;
for (int i=0; i<staticResourceValues.Length; i++)
{
// If this dictionary is a top level deferred section then we lookup the parser stack
// and then look in the app and theme dictionaries to resolve the current static resource.
if (!inDeferredSection)
{
staticResourceValues[i] = context.BamlReader.FindResourceInParentChain(
((StaticResourceExtension)staticResourceValues[i]).ResourceKey,
true /*allowDeferredResourceReference*/,
true /*mustReturnDeferredResourceReference*/);
}
else
{
// If this dictionary is nested within another deferred section then we try to
// resolve the current staticresource against the parser stack and if not
// able to resolve then we fallback to the pre-fetched value from the outer
// deferred section.
StaticResourceHolder srHolder = (StaticResourceHolder)staticResourceValues[i];
object value = context.BamlReader.FindResourceInParserStack(
srHolder.ResourceKey,
true /*allowDeferredResourceReference*/,
true /*mustReturnDeferredResourceReference*/);
if (value == DependencyProperty.UnsetValue)
{
// If value wan't found the fallback
// to the prefetched value
value = srHolder.PrefetchedValue;
}
staticResourceValues[i] = value;
}
}
}
}
#endif
private Type GetTypeOfFirstObject(KeyRecord keyRecord)
{
Type rootType = _reader.GetTypeOfFirstStartObject(keyRecord);
return rootType ?? typeof(String);
}
private object CreateObject(KeyRecord key)
{
System.Xaml.XamlReader xamlReader = _reader.ReadObject(key);
// v3 Markup Compiler will occasionally produce deferred
// content with keys but no values. We need to allow returning
// null in this scenario to match v3 compat and not throw an
// error.
if (xamlReader == null)
return null;
Uri baseUri = (_rootElement is IUriContext) ? ((IUriContext)_rootElement).BaseUri : _baseUri;
return WpfXamlLoader.LoadDeferredContent(
xamlReader, _objectWriterFactory, false /*skipJournaledProperites*/,
_rootElement, _objectWriterSettings, baseUri);
}
// Moved "Lookup()" from 3.5 BamlRecordReader to 4.0 ResourceDictionary
internal object Lookup(object key, bool allowDeferredResourceReference, bool mustReturnDeferredResourceReference, bool canCacheAsThemeResource)
{
if (allowDeferredResourceReference)
{
// Attempt to delay load resources from ResourceDictionaries
bool canCache;
return FetchResource(key, allowDeferredResourceReference, mustReturnDeferredResourceReference, canCacheAsThemeResource, out canCache);
}
else
{
if (!mustReturnDeferredResourceReference)
{
return this[key];
}
else
{
return new DeferredResourceReferenceHolder(key, this[key]);
}
}
}
#endregion DeferContent
#region HelperMethods
// Add an owner for this dictionary
internal void AddOwner(DispatcherObject owner)
{
if (_inheritanceContext == null)
{
// the first owner gets to be the InheritanceContext for
// all the values in the dictionary that want one.
DependencyObject inheritanceContext = owner as DependencyObject;
if (inheritanceContext != null)
{
_inheritanceContext = new WeakReference(inheritanceContext);
// set InheritanceContext for the existing values
AddInheritanceContextToValues();
}
else
{
// if the first owner is ineligible, use a dummy
_inheritanceContext = new WeakReference(DummyInheritanceContext);
// do not call AddInheritanceContextToValues -
// the owner is an Application, and we'll be
// calling SealValues soon, which takes care
// of InheritanceContext as well
}
}
FrameworkElement fe = owner as FrameworkElement;
if (fe != null)
{
if (_ownerFEs == null)
{
_ownerFEs = new WeakReferenceList(1);
}
else if (_ownerFEs.Contains(fe) && ContainsCycle(this))
{
throw new InvalidOperationException(SR.ResourceDictionaryInvalidMergedDictionary);
}
// Propagate the HasImplicitStyles flag to the new owner
if (HasImplicitStyles)
{
fe.ShouldLookupImplicitStyles = true;
}
_ownerFEs.Add(fe);
}
else
{
FrameworkContentElement fce = owner as FrameworkContentElement;
if (fce != null)
{
if (_ownerFCEs == null)
{
_ownerFCEs = new WeakReferenceList(1);
}
else if (_ownerFCEs.Contains(fce) && ContainsCycle(this))
{
throw new InvalidOperationException(SR.ResourceDictionaryInvalidMergedDictionary);
}
// Propagate the HasImplicitStyles flag to the new owner
if (HasImplicitStyles)
{
fce.ShouldLookupImplicitStyles = true;
}
_ownerFCEs.Add(fce);
}
else
{
Application app = owner as Application;
if (app != null)
{
if (_ownerApps == null)
{
_ownerApps = new WeakReferenceList(1);
}
else if (_ownerApps.Contains(app) && ContainsCycle(this))
{
throw new InvalidOperationException(SR.ResourceDictionaryInvalidMergedDictionary);
}
// Propagate the HasImplicitStyles flag to the new owner
if (HasImplicitStyles)
{
app.HasImplicitStylesInResources = true;
}
_ownerApps.Add(app);
// An Application ResourceDictionary can be accessed across threads
CanBeAccessedAcrossThreads = true;
// Seal all the styles and templates in this app dictionary
SealValues();
}
}
}
AddOwnerToAllMergedDictionaries(owner);
// This dictionary will be marked initialized if no one has called BeginInit on it.
// This is done now because having an owner is like a parenting operation for the dictionary.
TryInitialize();
}
// Remove an owner for this dictionary
internal void RemoveOwner(DispatcherObject owner)
{
FrameworkElement fe = owner as FrameworkElement;
if (fe != null)
{
if (_ownerFEs != null)
{
_ownerFEs.Remove(fe);
if (_ownerFEs.Count == 0)
{
_ownerFEs = null;
}
}
}
else
{
FrameworkContentElement fce = owner as FrameworkContentElement;
if (fce != null)
{
if (_ownerFCEs != null)
{
_ownerFCEs.Remove(fce);
if (_ownerFCEs.Count == 0)
{
_ownerFCEs = null;
}
}
}
else
{
Application app = owner as Application;
if (app != null)
{
if (_ownerApps != null)
{
_ownerApps.Remove(app);
if (_ownerApps.Count == 0)
{
_ownerApps = null;
}
}
}
}
}
if (owner == InheritanceContext)
{
RemoveInheritanceContextFromValues();
_inheritanceContext = null;
}
RemoveOwnerFromAllMergedDictionaries(owner);
}
// Check if the given is an owner to this dictionary
internal bool ContainsOwner(DispatcherObject owner)
{
FrameworkElement fe = owner as FrameworkElement;
if (fe != null)
{
return (_ownerFEs != null && _ownerFEs.Contains(fe));
}
else
{
FrameworkContentElement fce = owner as FrameworkContentElement;
if (fce != null)
{
return (_ownerFCEs != null && _ownerFCEs.Contains(fce));
}
else
{
Application app = owner as Application;
if (app != null)
{
return (_ownerApps != null && _ownerApps.Contains(app));
}
}
}
return false;
}
// Helper method that tries to set IsInitialized to true if BeginInit hasn't been called before this.
// This method is called on AddOwner
private void TryInitialize()
{
if (!IsInitializePending &&
!IsInitialized)
{
IsInitialized = true;
}
}
// Call FrameworkElement.InvalidateTree with the right data
private void NotifyOwners(ResourcesChangeInfo info)
{
bool shouldInvalidate = IsInitialized;
bool hasImplicitStyles = info.IsResourceAddOperation && HasImplicitStyles;
if (shouldInvalidate && InvalidatesImplicitDataTemplateResources)
{
info.SetIsImplicitDataTemplateChange();
}
if (shouldInvalidate || hasImplicitStyles)
{
// Invalidate all FE owners
if (_ownerFEs != null)
{
foreach (Object o in _ownerFEs)
{
FrameworkElement fe = o as FrameworkElement;
if (fe != null)
{
// Set the HasImplicitStyles flag on the owner
if (hasImplicitStyles)
fe.ShouldLookupImplicitStyles = true;
// If this dictionary has been initialized fire an invalidation
// to let the tree know of this change.
if (shouldInvalidate)
TreeWalkHelper.InvalidateOnResourcesChange(fe, null, info);
}
}
}
// Invalidate all FCE owners
if (_ownerFCEs != null)
{
foreach (Object o in _ownerFCEs)
{
FrameworkContentElement fce = o as FrameworkContentElement;
if (fce != null)
{
// Set the HasImplicitStyles flag on the owner
if (hasImplicitStyles)
fce.ShouldLookupImplicitStyles = true;
// If this dictionary has been initialized fire an invalidation
// to let the tree know of this change.
if (shouldInvalidate)
TreeWalkHelper.InvalidateOnResourcesChange(null, fce, info);
}
}
}
// Invalidate all App owners
if (_ownerApps != null)
{
foreach (Object o in _ownerApps)
{
Application app = o as Application;
if (app != null)
{
// Set the HasImplicitStyles flag on the owner
if (hasImplicitStyles)
app.HasImplicitStylesInResources = true;
// If this dictionary has been initialized fire an invalidation
// to let the tree know of this change.
if (shouldInvalidate)
app.InvalidateResourceReferences(info);
}
}
}
}
}
/// <summary>
/// Fetches the resource corresponding to the given key from this dictionary.
/// Returns a DeferredResourceReference if the object has not been inflated yet.
/// </summary>
internal object FetchResource(
object resourceKey,
bool allowDeferredResourceReference,
bool mustReturnDeferredResourceReference,
out bool canCache)
{
return FetchResource(
resourceKey,
allowDeferredResourceReference,
mustReturnDeferredResourceReference,
true /*canCacheAsThemeResource*/,
out canCache);
}
/// <summary>
/// Fetches the resource corresponding to the given key from this dictionary.
/// Returns a DeferredResourceReference if the object has not been inflated yet.
/// </summary>
private object FetchResource(
object resourceKey,
bool allowDeferredResourceReference,
bool mustReturnDeferredResourceReference,
bool canCacheAsThemeResource,
out bool canCache)
{
Debug.Assert(resourceKey != null, "ResourceKey cannot be null");
if (allowDeferredResourceReference)
{
if (ContainsBamlObjectFactory(resourceKey) ||
(mustReturnDeferredResourceReference && Contains(resourceKey)))
{
canCache = false;
DeferredResourceReference deferredResourceReference;
if (!IsThemeDictionary)
{
if (FrameworkAppContextSwitches.DisableDynamicResourceOptimization)
{
if (_ownerApps is not null)
{
deferredResourceReference = new DeferredAppResourceReference(this, resourceKey);
}
else
{
deferredResourceReference = new DeferredResourceReference(this, resourceKey);
}
// Cache the deferredResourceReference so that it can be validated
// in case of a dictionary change prior to its inflation
if (_weakDeferredResourceReferences is null)
{
_weakDeferredResourceReferences = new WeakReferenceList();
}
_weakDeferredResourceReferences.Add(deferredResourceReference, true /*SkipFind*/);
}
else
{
// Cache the deferredResourceReference so that it can be validated
// in case of a dictionary change prior to its inflation
_deferredResourceReferencesList ??= new DeferredResourceReferenceList();
if (_deferredResourceReferencesList.Get(resourceKey) is { } existingDeferredResourceReference
&& existingDeferredResourceReference.Dictionary == this)
{
deferredResourceReference = existingDeferredResourceReference;
}
else
{
deferredResourceReference = _ownerApps is not null ? new DeferredAppResourceReference(this, resourceKey) : new DeferredResourceReference(this, resourceKey);
_deferredResourceReferencesList.AddOrSet(deferredResourceReference);
}
}
}
else
{
deferredResourceReference = new DeferredThemeResourceReference(this, resourceKey, canCacheAsThemeResource);
}
ResourceDictionaryDiagnostics.RecordLookupResult(resourceKey, this);
return deferredResourceReference;
}
}
return GetValue(resourceKey, out canCache);
}
/// <summary>
/// Validate the deferredResourceReference with the given key. Key could be null meaning
/// some catastrophic operation occurred so simply validate all DeferredResourceReferences
/// </summary>
private void ValidateDeferredResourceReferences(object resourceKey)
{
if (FrameworkAppContextSwitches.DisableDynamicResourceOptimization)
{
if (_weakDeferredResourceReferences != null)
{
foreach (Object o in _weakDeferredResourceReferences)
{
DeferredResourceReference deferredResourceReference = o as DeferredResourceReference;
if (deferredResourceReference != null && (resourceKey == null || Object.Equals(resourceKey, deferredResourceReference.Key)))
{
// This will inflate the deferred reference, causing it
// to be removed from the list. The list may also be
// purged of dead references.
deferredResourceReference.GetValue(BaseValueSourceInternal.Unknown);
}
}
}
}
else
{
if (_deferredResourceReferencesList is null)
{
return;
}
if (resourceKey is null)
{
foreach (DeferredResourceReference deferredResourceReference in _deferredResourceReferencesList)
{
Inflate(deferredResourceReference);
}
}
else
{
DeferredResourceReference deferredResourceReference = _deferredResourceReferencesList.Get(resourceKey);
Inflate(deferredResourceReference);
}
return;
void Inflate(DeferredResourceReference deferredResourceReference)
{
if (deferredResourceReference is not null)
{
// This will inflate the deferred reference, causing it
// to be removed from the list. The list may also be
// purged of dead references.
deferredResourceReference.GetValue(BaseValueSourceInternal.Unknown);
}
}
}
}
/// <summary>
/// Called when the MergedDictionaries collection changes
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OnMergedDictionariesChanged(object sender, NotifyCollectionChangedEventArgs e)
{
List<ResourceDictionary> oldDictionaries = null;
List<ResourceDictionary> newDictionaries = null;
ResourceDictionary mergedDictionary;
ResourcesChangeInfo info;
if (e.Action != NotifyCollectionChangedAction.Reset)
{
Invariant.Assert(
(e.NewItems != null && e.NewItems.Count > 0) ||
(e.OldItems != null && e.OldItems.Count > 0),
"The NotifyCollectionChanged event fired when no dictionaries were added or removed");
// If one or more resource dictionaries were removed we
// need to remove the owners they were given by their
// parent ResourceDictionary.
if (e.Action == NotifyCollectionChangedAction.Remove
|| e.Action == NotifyCollectionChangedAction.Replace)
{
oldDictionaries = new List<ResourceDictionary>(e.OldItems.Count);
for (int i = 0; i < e.OldItems.Count; i++)
{
mergedDictionary = (ResourceDictionary)e.OldItems[i];
oldDictionaries.Add(mergedDictionary);
RemoveParentOwners(mergedDictionary);
}
}
// If one or more resource dictionaries were added to the merged
// dictionaries collection we need to send down the parent
// ResourceDictionary's owners.
if (e.Action == NotifyCollectionChangedAction.Add
|| e.Action == NotifyCollectionChangedAction.Replace)
{
newDictionaries = new List<ResourceDictionary>(e.NewItems.Count);
for (int i = 0; i < e.NewItems.Count; i++)
{
mergedDictionary = (ResourceDictionary)e.NewItems[i];
newDictionaries.Add(mergedDictionary);
// If the merged dictionary HasImplicitStyle mark the outer dictionary the same.
if (!HasImplicitStyles && mergedDictionary.HasImplicitStyles)
{
HasImplicitStyles = true;
}
// If the merged dictionary HasImplicitDataTemplates mark the outer dictionary the same.
if (!HasImplicitDataTemplates && mergedDictionary.HasImplicitDataTemplates)
{
HasImplicitDataTemplates = true;
}
// If the parent dictionary is a theme dictionary mark the merged dictionary the same.
if (IsThemeDictionary)
{
mergedDictionary.IsThemeDictionary = true;
}
PropagateParentOwners(mergedDictionary);
}
}
info = new ResourcesChangeInfo(oldDictionaries, newDictionaries, false, false, null);
}
else
{
// Case when MergedDictionary collection is cleared
info = ResourcesChangeInfo.CatastrophicDictionaryChangeInfo;
}
// Notify the owners of the change and fire
// invalidation if already initialized
NotifyOwners(info);
}
/// <summary>
/// Adds the given owner to all merged dictionaries of this ResourceDictionary
/// </summary>
/// <param name="owner"></param>
private void AddOwnerToAllMergedDictionaries(DispatcherObject owner)
{
if (_mergedDictionaries != null)
{
for (int i = 0; i < _mergedDictionaries.Count; i++)
{
_mergedDictionaries[i].AddOwner(owner);
}
}
}
/// <summary>
///
/// </summary>
/// <param name="owner"></param>
private void RemoveOwnerFromAllMergedDictionaries(DispatcherObject owner)
{
if (_mergedDictionaries != null)
{
for (int i = 0; i < _mergedDictionaries.Count; i++)
{
_mergedDictionaries[i].RemoveOwner(owner);
}
}
}
/// <summary>
/// This sends down the owners of this ResourceDictionary into the given
/// merged dictionary. We do this because whenever a merged dictionary
/// changes it should invalidate all owners of its parent ResourceDictionary.
///
/// Note that AddOwners throw if the merged dictionary already has one of the
/// parent's owners. This implies that either we're putting a dictionary
/// into its own MergedDictionaries collection or we're putting the same
/// dictionary into the collection twice, neither of which are legal.
/// </summary>
/// <param name="mergedDictionary"></param>
private void PropagateParentOwners(ResourceDictionary mergedDictionary)
{
if (_ownerFEs != null)
{
Invariant.Assert(_ownerFEs.Count > 0);
if (mergedDictionary._ownerFEs == null)
{
mergedDictionary._ownerFEs = new WeakReferenceList(_ownerFEs.Count);
}
foreach (object o in _ownerFEs)
{
FrameworkElement fe = o as FrameworkElement;
if (fe != null)
mergedDictionary.AddOwner(fe);
}
}
if (_ownerFCEs != null)
{
Invariant.Assert(_ownerFCEs.Count > 0);
if (mergedDictionary._ownerFCEs == null)
{
mergedDictionary._ownerFCEs = new WeakReferenceList(_ownerFCEs.Count);
}
foreach (object o in _ownerFCEs)
{
FrameworkContentElement fce = o as FrameworkContentElement;
if (fce != null)
mergedDictionary.AddOwner(fce);
}
}
if (_ownerApps != null)
{
Invariant.Assert(_ownerApps.Count > 0);
if (mergedDictionary._ownerApps == null)
{
mergedDictionary._ownerApps = new WeakReferenceList(_ownerApps.Count);
}
foreach (object o in _ownerApps)
{
Application app = o as Application;
if (app != null)
mergedDictionary.AddOwner(app);
}
}
}
/// <summary>
/// Removes the owners of this ResourceDictionary from the given
/// merged dictionary. The merged dictionary will be left with
/// whatever owners it had before being merged.
/// </summary>
/// <param name="mergedDictionary"></param>
internal void RemoveParentOwners(ResourceDictionary mergedDictionary)
{
if (_ownerFEs != null)
{
foreach (Object o in _ownerFEs)
{
FrameworkElement fe = o as FrameworkElement;
mergedDictionary.RemoveOwner(fe);
}
}
if (_ownerFCEs != null)
{
Invariant.Assert(_ownerFCEs.Count > 0);
foreach (Object o in _ownerFCEs)
{
FrameworkContentElement fec = o as FrameworkContentElement;
mergedDictionary.RemoveOwner(fec);
}
}
if (_ownerApps != null)
{
Invariant.Assert(_ownerApps.Count > 0);
foreach (Object o in _ownerApps)
{
Application app = o as Application;
mergedDictionary.RemoveOwner(app);
}
}
}
private bool ContainsCycle(ResourceDictionary origin)
{
for (int i=0; i<MergedDictionaries.Count; i++)
{
ResourceDictionary mergedDictionary = MergedDictionaries[i];
if (mergedDictionary == origin || mergedDictionary.ContainsCycle(origin))
{
return true;
}
}
return false;
}
// three properties used by ResourceDictionaryDiagnostics
internal WeakReferenceList FrameworkElementOwners
{
get { return _ownerFEs; }
}
internal WeakReferenceList FrameworkContentElementOwners
{
get { return _ownerFCEs; }
}
internal WeakReferenceList ApplicationOwners
{
get { return _ownerApps; }
}
#endregion HelperMethods
#region Properties
internal WeakReferenceList WeakDeferredResourceReferences
{
get { return _weakDeferredResourceReferences; }
}
internal DeferredResourceReferenceList DeferredResourceReferencesList
{
get { return _deferredResourceReferencesList; }
}
#endregion Properties
#region Enumeration
/// <summary>
/// Iterates the dictionary's entries, handling deferred content.
/// </summary>
private class ResourceDictionaryEnumerator : IDictionaryEnumerator
{
internal ResourceDictionaryEnumerator(ResourceDictionary owner)
{
_owner = owner;
_keysEnumerator = _owner.Keys.GetEnumerator();
}
#region IEnumerator
object IEnumerator.Current
{
get
{
return ((IDictionaryEnumerator)this).Entry;
}
}
bool IEnumerator.MoveNext()
{
return _keysEnumerator.MoveNext();
}
void IEnumerator.Reset()
{
_keysEnumerator.Reset();
}
#endregion
#region IDictionaryEnumerator
DictionaryEntry IDictionaryEnumerator.Entry
{
get
{
object key = _keysEnumerator.Current;
object value = _owner[key];
return new DictionaryEntry(key, value);
}
}
object IDictionaryEnumerator.Key
{
get
{
return _keysEnumerator.Current;
}
}
object IDictionaryEnumerator.Value
{
get
{
return _owner[_keysEnumerator.Current];
}
}
#endregion
#region Data
private ResourceDictionary _owner;
private IEnumerator _keysEnumerator;
#endregion
}
/// <summary>
/// Iterator for the dictionary's Values collection, handling deferred content.
/// </summary>
private class ResourceValuesEnumerator : IEnumerator
{
internal ResourceValuesEnumerator(ResourceDictionary owner)
{
_owner = owner;
_keysEnumerator = _owner.Keys.GetEnumerator();
}
#region IEnumerator
object IEnumerator.Current
{
get
{
return _owner[_keysEnumerator.Current];
}
}
bool IEnumerator.MoveNext()
{
return _keysEnumerator.MoveNext();
}
void IEnumerator.Reset()
{
_keysEnumerator.Reset();
}
#endregion
#region Data
private ResourceDictionary _owner;
private IEnumerator _keysEnumerator;
#endregion
}
/// <summary>
/// Represents the dictionary's Values collection, handling deferred content.
/// </summary>
private class ResourceValuesCollection : ICollection
{
internal ResourceValuesCollection(ResourceDictionary owner)
{
_owner = owner;
}
#region ICollection
int ICollection.Count
{
get
{
return _owner.Count;
}
}
bool ICollection.IsSynchronized
{
get
{
return false;
}
}
object ICollection.SyncRoot
{
get
{
return this;
}
}
void ICollection.CopyTo(Array array, int index)
{
foreach (object key in _owner.Keys)
{
array.SetValue(_owner[key], index++);
}
}
IEnumerator IEnumerable.GetEnumerator()
{
return new ResourceValuesEnumerator(_owner);
}
#endregion
#region Data
private ResourceDictionary _owner;
#endregion
}
#endregion Enumeration
#region PrivateMethods
//
// This method
// 1. Seals all the freezables/styles/templates that belong to this App/Theme/Style/Template ResourceDictionary
//
private void SealValues()
{
Debug.Assert(IsThemeDictionary || _ownerApps != null || IsReadOnly, "This must be an App/Theme/Style/Template ResourceDictionary");
// sealing can cause DeferredResourceReferences to be replaced by the
// inflated values. This changes the Values collection,
// so we can't iterate it directly. Instead, iterate over a copy.
int count = _baseDictionary.Count;
if (count > 0)
{
object[] values = new object[count];
_baseDictionary.Values.CopyTo(values, 0);
foreach (object value in values)
{
SealValue(value);
}
}
}
//
// This method
// 1. Sets the InheritanceContext of the value to the dictionary's principal owner
// 2. Seals the freezable/style/template that is to be placed in an App/Theme/Style/Template ResourceDictionary
//
private void SealValue(object value)
{
DependencyObject inheritanceContext = InheritanceContext;
if (inheritanceContext != null)
{
AddInheritanceContext(inheritanceContext, value);
}
if (IsThemeDictionary || _ownerApps != null || IsReadOnly)
{
// If the value is a ISealable then seal it
StyleHelper.SealIfSealable(value);
}
}
// add inheritance context to a value
private void AddInheritanceContext(DependencyObject inheritanceContext, object value)
{
// The VisualBrush.Visual property is the "friendliest", i.e. the
// most likely to be accepted by the resource as FEs need to accept
// being rooted by a VisualBrush.
//
// NOTE: Freezable.Debug_VerifyContextIsValid() contains a special
// case to allow this with the VisualBrush.Visual property.
// Changes made here will require updates in Freezable.cs
if (inheritanceContext.ProvideSelfAsInheritanceContext(value, VisualBrush.VisualProperty))
{
// if the assignment was successful, seal the value's InheritanceContext.
// This makes sure the resource always gets inheritance-related information
// from its point of definition, not from its point of use.
DependencyObject doValue = value as DependencyObject;
if (doValue != null)
{
doValue.IsInheritanceContextSealed = true;
}
}
}
// add inheritance context to all values that came from this dictionary
private void AddInheritanceContextToValues()
{
DependencyObject inheritanceContext = InheritanceContext;
// setting InheritanceContext can cause values to be replaced.
// This changes the Values collection, so we can't iterate it directly.
// Instead, iterate over a copy.
int count = _baseDictionary.Count;
if (count > 0)
{
object[] values = new object[count];
_baseDictionary.Values.CopyTo(values, 0);
foreach (object value in values)
{
AddInheritanceContext(inheritanceContext, value);
}
}
}
// remove inheritance context from a value, if it came from this dictionary
private void RemoveInheritanceContext(object value)
{
DependencyObject doValue = value as DependencyObject;
DependencyObject inheritanceContext = InheritanceContext;
if (doValue != null && inheritanceContext != null &&
doValue.IsInheritanceContextSealed &&
doValue.InheritanceContext == inheritanceContext)
{
doValue.IsInheritanceContextSealed = false;
inheritanceContext.RemoveSelfAsInheritanceContext(doValue, VisualBrush.VisualProperty);
}
}
// remove inheritance context from all values that came from this dictionary
private void RemoveInheritanceContextFromValues()
{
foreach (object value in _baseDictionary.Values)
{
RemoveInheritanceContext(value);
}
}
// Sets the HasImplicitStyles flag if the given key is of type Type.
private void UpdateHasImplicitStyles(object key)
{
// Update the HasImplicitStyles flag
if (!HasImplicitStyles)
{
HasImplicitStyles = ((key as Type) != null);
}
}
// Sets the HasImplicitDataTemplates flag if the given key is of type DataTemplateKey.
private void UpdateHasImplicitDataTemplates(object key)
{
// Update the HasImplicitDataTemplates flag
if (!HasImplicitDataTemplates)
{
HasImplicitDataTemplates = (key is DataTemplateKey);
}
}
private DependencyObject InheritanceContext
{
get
{
return (_inheritanceContext != null)
? (DependencyObject)_inheritanceContext.Target
: null;
}
}
private bool IsInitialized
{
get { return ReadPrivateFlag(PrivateFlags.IsInitialized); }
set { WritePrivateFlag(PrivateFlags.IsInitialized, value); }
}
private bool IsInitializePending
{
get { return ReadPrivateFlag(PrivateFlags.IsInitializePending); }
set { WritePrivateFlag(PrivateFlags.IsInitializePending, value); }
}
private bool IsThemeDictionary
{
get { return ReadPrivateFlag(PrivateFlags.IsThemeDictionary); }
set
{
if (IsThemeDictionary != value)
{
WritePrivateFlag(PrivateFlags.IsThemeDictionary, value);
if (value)
{
SealValues();
}
if (_mergedDictionaries != null)
{
for (int i=0; i<_mergedDictionaries.Count; i++)
{
_mergedDictionaries[i].IsThemeDictionary = value;
}
}
}
}
}
internal bool HasImplicitStyles
{
get { return ReadPrivateFlag(PrivateFlags.HasImplicitStyles); }
set { WritePrivateFlag(PrivateFlags.HasImplicitStyles, value); }
}
internal bool HasImplicitDataTemplates
{
get { return ReadPrivateFlag(PrivateFlags.HasImplicitDataTemplates); }
set { WritePrivateFlag(PrivateFlags.HasImplicitDataTemplates, value); }
}
internal bool CanBeAccessedAcrossThreads
{
get { return ReadPrivateFlag(PrivateFlags.CanBeAccessedAcrossThreads); }
set { WritePrivateFlag(PrivateFlags.CanBeAccessedAcrossThreads, value); }
}
private void WritePrivateFlag(PrivateFlags bit, bool value)
{
if (value)
{
_flags |= bit;
}
else
{
_flags &= ~bit;
}
}
private bool ReadPrivateFlag(PrivateFlags bit)
{
return (_flags & bit) != 0;
}
private void CloseReader()
{
_reader.Close();
_reader = null;
}
private void CopyDeferredContentFrom(ResourceDictionary loadedRD)
{
_buffer = loadedRD._buffer;
_bamlStream = loadedRD._bamlStream;
_startPosition = loadedRD._startPosition;
_contentSize = loadedRD._contentSize;
_objectWriterFactory = loadedRD._objectWriterFactory;
_objectWriterSettings = loadedRD._objectWriterSettings;
_rootElement = loadedRD._rootElement;
_reader = loadedRD._reader;
_numDefer = loadedRD._numDefer;
_deferredLocationList = loadedRD._deferredLocationList;
IsUnsafe = loadedRD.IsUnsafe;
}
private void MoveDeferredResourceReferencesFrom(ResourceDictionary loadedRD)
{
if (FrameworkAppContextSwitches.DisableDynamicResourceOptimization)
{
// copy the list
_weakDeferredResourceReferences = loadedRD._weakDeferredResourceReferences;
// redirect each entry toward its new owner
if (_weakDeferredResourceReferences != null)
{
foreach (DeferredResourceReference drr in _weakDeferredResourceReferences)
{
drr.Dictionary = this;
}
}
}
else
{
// copy the list
_deferredResourceReferencesList = loadedRD._deferredResourceReferencesList;
// redirect each entry toward its new owner
if (_deferredResourceReferencesList != null)
{
_deferredResourceReferencesList.ChangeDictionary(this);
}
}
}
#endregion PrivateMethods
#region PrivateDataStructures
private enum PrivateFlags : byte
{
IsInitialized = 0x01,
IsInitializePending = 0x02,
IsReadOnly = 0x04,
IsThemeDictionary = 0x08,
HasImplicitStyles = 0x10,
CanBeAccessedAcrossThreads = 0x20,
InvalidatesImplicitDataTemplateResources = 0x40,
HasImplicitDataTemplates = 0x80,
}
/// <summary>
/// This wrapper class exists so SourceUriTypeConverterMarkupExtension can pass
/// a more complete Uri to help resolve to the correct assembly, while also passing
/// the original Uri so that ResourceDictionary.Source still returns the original value.
/// </summary>
internal class ResourceDictionarySourceUriWrapper : Uri
{
public ResourceDictionarySourceUriWrapper(Uri originalUri, Uri versionedUri) : base(originalUri.OriginalString, UriKind.RelativeOrAbsolute)
{
OriginalUri = originalUri;
VersionedUri = versionedUri;
}
internal Uri OriginalUri
{
get;
set;
}
internal Uri VersionedUri
{
get;
set;
}
}
#endregion PrivateDataStructures
// flag set by ThemeDictionaryExtension
// to know that classic/generic Uri's should be used as fallbacks
// when themed dictionary is not found
internal bool IsSourcedFromThemeDictionary = false;
private FallbackState _fallbackState = FallbackState.Classic;
private enum FallbackState
{
Classic,
Generic,
None
}
#region Data
private Hashtable _baseDictionary = null;
private WeakReferenceList _ownerFEs = null;
private WeakReferenceList _ownerFCEs = null;
private WeakReferenceList _ownerApps = null;
private WeakReferenceList _weakDeferredResourceReferences = null;
private DeferredResourceReferenceList _deferredResourceReferencesList = null;
private ObservableCollection<ResourceDictionary> _mergedDictionaries = null;
private Uri _source = null;
private Uri _baseUri = null;
private PrivateFlags _flags = 0;
private List<KeyRecord> _deferredLocationList = null;
// Buffer that contains deferable content. This may be null if a stream was passed
// instead of a buffer. If a buffer was passed, then a memory stream is made on the buffer
private byte[] _buffer;
// Persistent Stream that contains values.
private Stream _bamlStream;
// Start position in the stream where the first value record is located. All offsets for
// the keys are relative to this position.
private Int64 _startPosition;
// Size of the delay loaded content, which only includes the value section and not the keys.
private Int32 _contentSize;
// The root element at the time the deferred content information was given to the dictionary.
private object _rootElement;
// The number of keys that correspond to deferred content. When this reaches 0,
// the stream can be closed.
private int _numDefer;
// The object that becomes the InheritanceContext of all eligible
// values in the dictionary - typically the principal owner of the dictionary.
// We store a weak reference so that the dictionary does not leak the owner.
private WeakReference _inheritanceContext;
// a dummy DO, used as the InheritanceContext when the dictionary's owner is
// not itself a DO
private static readonly DependencyObject DummyInheritanceContext = new DependencyObject();
XamlObjectIds _contextXamlObjectIds = new XamlObjectIds();
private IXamlObjectWriterFactory _objectWriterFactory;
private XamlObjectWriterSettings _objectWriterSettings;
private Baml2006Reader _reader;
#endregion Data
}
}
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