private void RecursiveRestoreDataGridContextsState(DataGridContext dataGridContext)
{
WeakDataGridContextKey weakDataGridContextKey = new WeakDataGridContextKey(dataGridContext);
SaveRestoreDataGridContextStateVisitor saveRestoreDataGridContextStateVisitor;
if (m_dataGridContextsStateDictionary.TryGetValue(weakDataGridContextKey, out saveRestoreDataGridContextStateVisitor))
{
try
{
saveRestoreDataGridContextStateVisitor.RestoreState(dataGridContext as IDataGridContextVisitable);
}
finally
{
m_dataGridContextsStateDictionary.Remove(weakDataGridContextKey);
}
}
IEnumerable <DataGridContext> subDataGridContexts = dataGridContext.GetChildContexts();
foreach (DataGridContext subDataGridContext in subDataGridContexts)
{
this.RecursiveRestoreDataGridContextsState(subDataGridContext);
}
}
public override bool Equals(object obj)
{
WeakDataGridContextKey weakDataGridContextKey = obj as WeakDataGridContextKey;
if (weakDataGridContextKey == null)
{
return(false);
}
if (m_cachedHash != weakDataGridContextKey.m_cachedHash)
{
return(false);
}
if (m_sourceDetailConfigurationRelationName != weakDataGridContextKey.m_sourceDetailConfigurationRelationName)
{
return(false);
}
int dataGridContextStatusKeyLength = (weakDataGridContextKey.m_weakItemsTree == null) ? 0 : weakDataGridContextKey.m_weakItemsTree.Length;
int myLength = (m_weakItemsTree == null) ? 0 : m_weakItemsTree.Length;
if (myLength != dataGridContextStatusKeyLength)
{
return(false);
}
for (int i = 0; i < dataGridContextStatusKeyLength; i++)
{
object sourceItem = m_weakItemsTree[i].Target;
object targetItem = weakDataGridContextKey.m_weakItemsTree[i].Target;
if (!object.Equals(sourceItem, targetItem))
{
return(false);
}
}
return(true);
}
private void RecursiveRestoreDataGridContextsState(DataGridContext dataGridContext)
{
var weakDataGridContextKey = new WeakDataGridContextKey(dataGridContext);
var saveRestoreDataGridContextStateVisitor = default(SaveRestoreDataGridContextStateVisitor);
if (m_dataGridContextsStateDictionary.TryGetValue(weakDataGridContextKey, out saveRestoreDataGridContextStateVisitor))
{
try
{
saveRestoreDataGridContextStateVisitor.RestoreState(dataGridContext as IDataGridContextVisitable);
}
finally
{
m_dataGridContextsStateDictionary.Remove(weakDataGridContextKey);
}
}
foreach (var subDataGridContext in dataGridContext.GetChildContextsCore())
{
this.RecursiveRestoreDataGridContextsState(subDataGridContext);
}
}
internal WeakDataGridContextKey(DataGridContext dataGridContext)
{
var parentDataGridContext = dataGridContext.ParentDataGridContext;
var level = 0;
while (parentDataGridContext != null)
{
level++;
parentDataGridContext = parentDataGridContext.ParentDataGridContext;
}
Debug.Assert(((level == 0) || (dataGridContext.SourceDetailConfiguration != null)), "A child dataGridContext must have a SourceDetailConfiguration.");
m_sourceDetailConfigurationRelationName = (dataGridContext.SourceDetailConfiguration != null) ? dataGridContext.SourceDetailConfiguration.RelationName : string.Empty;
if (level > 0)
{
// We are NOT dealing with the root DataGridContext.
// Build the tree of master items.
m_weakItemsTree = new WeakReference[level];
var tempDataGridContext = dataGridContext;
for (int i = level - 1; i >= 0; i--)
{
// Ensure to get a reference to the System.Data.DataRow when doing a
// save/restore of a System.Data.DataRowView since the view is recreated
// for every detail views
var parentItem = ItemsSourceHelper.TryGetDataRowFromDataItem(tempDataGridContext.ParentItem);
m_weakItemsTree[i] = new WeakReference(parentItem);
tempDataGridContext = tempDataGridContext.ParentDataGridContext;
}
}
m_hashCode = WeakDataGridContextKey.CalculateHashCode(m_sourceDetailConfigurationRelationName, m_weakItemsTree);
}
internal void RestoreDataGridContextState( DataGridContext dataGridContext )
{
if( ( m_dataGridContextsStateDictionary == null ) || ( m_dataGridContextsStateDictionary.Count == 0 ) )
return;
if( dataGridContext == null )
throw new ArgumentNullException( "dataGridContext" );
// A call to RestoreDataGridContextState can be made while processing a save or a restore
// of a DataGridContext because the Generator forces the call in EnsureNodeTreeCreated
// when public methods are accessed. If we are saving, already restoring or pending restoring
// we ignore this call
if( dataGridContext.IsSavingState
|| dataGridContext.IsDeferRestoringState
|| dataGridContext.IsRestoringState )
return;
WeakDataGridContextKey weakDataGridContextKey = new WeakDataGridContextKey( dataGridContext );
SaveRestoreDataGridContextStateVisitor saveRestoreDataGridContextStateVisitor;
if( m_dataGridContextsStateDictionary.TryGetValue( weakDataGridContextKey, out saveRestoreDataGridContextStateVisitor ) )
{
try
{
dataGridContext.IsRestoringState = true;
// Restoring this dataGridContext state's will expand sub items that should be expanded.
// Their expansion will make the customItemGenerator generate sub detailNodes, which in turn will try
// to be restored to their previous state.
saveRestoreDataGridContextStateVisitor.RestoreState( ( IDataGridContextVisitable )dataGridContext );
Debug.WriteLineIf( this.DebugSaveRestore, "RESTORING DataGridContext state for WeakDataGridContextKey: " + weakDataGridContextKey.GetHashCode().ToString() + " RESTORED!" );
}
catch
{
Debug.WriteLineIf( this.DebugSaveRestore, "RESTORING DataGridContext state for WeakDataGridContextKey: " + weakDataGridContextKey.GetHashCode().ToString() + " FAILED!" );
}
finally
{
m_dataGridContextsStateDictionary.Remove( weakDataGridContextKey );
dataGridContext.IsRestoringState = false;
}
}
else
{
Debug.WriteLineIf( this.DebugSaveRestore, "Cannot Restore. No state saved for WeakDataGridContextKey: " + weakDataGridContextKey.GetHashCode().ToString() );
}
}
internal void SaveDataGridContextState( DataGridContext dataGridContext, bool handleExpandedItems, int maxGroupLevel )
{
if( dataGridContext == null )
throw new ArgumentNullException( "dataGridContext" );
Debug.Assert( !dataGridContext.IsRestoringState );
if( dataGridContext.IsSavingState )
return;
dataGridContext.IsSavingState = true;
try
{
WeakDataGridContextKey weakDataGridContextKey = new WeakDataGridContextKey( dataGridContext );
if( m_dataGridContextsStateDictionary == null )
{
m_dataGridContextsStateDictionary = new Dictionary<WeakDataGridContextKey, SaveRestoreDataGridContextStateVisitor>();
}
else if( m_dataGridContextsStateDictionary.ContainsKey( weakDataGridContextKey ) )
{
// Already a state saved for this context. Don't overwrite it.
Debug.WriteLineIf( this.DebugSaveRestore, "Already a state saved for WeakDataGridContextKey: " + weakDataGridContextKey.GetHashCode().ToString() );
return;
}
SaveRestoreDataGridContextStateVisitor saveRestoreDataGridContextStateVisitor = new SaveRestoreDataGridContextStateVisitor( handleExpandedItems, maxGroupLevel, false );
try
{
saveRestoreDataGridContextStateVisitor.SaveState( ( IDataGridContextVisitable )dataGridContext );
m_dataGridContextsStateDictionary.Add( weakDataGridContextKey, saveRestoreDataGridContextStateVisitor );
Debug.WriteLineIf( this.DebugSaveRestore, "SAVING DataGridContext state for WeakDataGridContextKey: " + weakDataGridContextKey.GetHashCode().ToString() + " SAVED!" );
}
catch
{
Debug.WriteLineIf( this.DebugSaveRestore, "SAVING DataGridContext state for WeakDataGridContextKey: " + weakDataGridContextKey.GetHashCode().ToString() + " FAILED!" );
}
}
finally
{
dataGridContext.IsSavingState = false;
}
}
private void RecursiveRestoreDataGridContextsState( DataGridContext dataGridContext )
{
WeakDataGridContextKey weakDataGridContextKey = new WeakDataGridContextKey( dataGridContext );
SaveRestoreDataGridContextStateVisitor saveRestoreDataGridContextStateVisitor;
if( m_dataGridContextsStateDictionary.TryGetValue( weakDataGridContextKey, out saveRestoreDataGridContextStateVisitor ) )
{
try
{
saveRestoreDataGridContextStateVisitor.RestoreState( dataGridContext as IDataGridContextVisitable );
}
finally
{
m_dataGridContextsStateDictionary.Remove( weakDataGridContextKey );
}
}
IEnumerable<DataGridContext> subDataGridContexts = dataGridContext.GetChildContexts();
foreach( DataGridContext subDataGridContext in subDataGridContexts )
{
this.RecursiveRestoreDataGridContextsState( subDataGridContext );
}
}
