internal bool InsertAfter(GeneratorNode insert)
{
if (insert == null)
{
throw new DataGridInternalException("GeneratorNode is null.");
}
var insertionCount = default(int);
var chainLength = default(int);
var insertLast = GeneratorNodeHelper.EvaluateChain(insert, out insertionCount, out chainLength);
var nextNode = m_state.Node.Next;
if (nextNode != null)
{
nextNode.Previous = insertLast;
}
insertLast.Next = nextNode;
insert.Previous = m_state.Node;
m_state.Node.Next = insert;
// Move the current node to the last node inserted
if (!this.MoveToNextBy(chainLength))
{
throw new DataGridInternalException("Unable to move to the requested generator index.");
}
return(true);
}
internal static GeneratorNode EvaluateChain(GeneratorNode startNode, out int totalChildCount, out int chainLength)
{
if (startNode == null)
{
throw new ArgumentNullException("startNode");
}
var current = new State(startNode, 0, 0);
totalChildCount = startNode.ItemCount;
chainLength = 1;
while (true)
{
if (!GeneratorNodeHelper.MoveToNext(ref current))
{
break;
}
totalChildCount += current.Node.ItemCount;
chainLength++;
}
return(current.Node);
}
public bool InsertAfter(GeneratorNode insert)
{
if (insert == null)
{
throw new DataGridInternalException();
}
int insertionCount;
int chainLength;
GeneratorNode insertLast = GeneratorNodeHelper.EvaluateChain(insert, out insertionCount, out chainLength);
if (m_currentNode.Next != null)
{
m_currentNode.Next.Previous = insertLast;
}
insertLast.Next = m_currentNode.Next;
insert.Previous = m_currentNode;
m_currentNode.Next = insert;
// Move the current node to the last node inserted
if (!this.MoveToNextBy(chainLength))
{
throw new DataGridInternalException();
}
return(true);
}
public bool MoveToFollowing()
{
bool retval = false;
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper(m_currentNode, m_index, m_sourceDataIndex);
while (!retval)
{
retval = nodeHelper.MoveToNext();
if (!retval)
{
if (!nodeHelper.MoveToParent())
{
//cannot move to parent and could not move to next, this is the end of the chain.
break;
}
}
}
if (retval)
{
m_currentNode = nodeHelper.CurrentNode;
m_index = nodeHelper.Index;
m_sourceDataIndex = nodeHelper.SourceDataIndex;
}
return(retval);
}
//Note: this function will not check for the presence of the item in the details for Items nodes.
internal bool AbsoluteFindItem(object item)
{
// This method will search through nodes, even those collapsed for the item.
var current = m_state;
while (true)
{
var itemsNode = current.Node as CollectionGeneratorNode;
if ((itemsNode != null) && itemsNode.Items.Contains(item))
{
break;
}
// If we reach this point, it's because the item we are looking
// for is not in this node... Try to access the child
if (!GeneratorNodeHelper.MoveToChild(ref current, false))
{
// Try "advancing" to the next item.
if (!GeneratorNodeHelper.MoveToFollowing(ref current))
{
return(false);
}
}
}
m_state = current;
this.EnsureState();
return(true);
}
internal bool MoveBackward()
{
var startNode = m_state.Node;
while (true)
{
if (!(m_state.Node is GroupGeneratorNode) && (m_state.Node != startNode) && (m_state.Node.ItemCount != 0))
{
break;
}
if (!GeneratorNodeHelper.MoveToChild(ref m_state))
{
if (!GeneratorNodeHelper.MoveToPreceding(ref m_state))
{
return(false);
}
}
else
{
GeneratorNodeHelper.MoveToEnd(ref m_state);
}
}
this.EnsureState();
return(true);
}
internal bool MoveToNextBy(int count)
{
var success = GeneratorNodeHelper.MoveToNext(ref m_state, count);
this.EnsureState();
return(success);
}
internal bool MoveToPrevious()
{
var success = GeneratorNodeHelper.MoveToPrevious(ref m_state);
this.EnsureState();
return(success);
}
internal bool MoveToChild(bool skipItemLessGroupNodes)
{
var success = GeneratorNodeHelper.MoveToChild(ref m_state, skipItemLessGroupNodes);
this.EnsureState();
return(success);
}
internal bool FindNodeForIndex(int index)
{
var success = GeneratorNodeHelper.FindNodeForIndex(ref m_state, index);
this.EnsureState();
return(success);
}
internal bool MoveToFirst()
{
GeneratorNodeHelper.MoveToFirst(ref m_state);
this.EnsureState();
return(true);
}
internal int FindItem(object item)
{
var current = m_state;
while (true)
{
var itemsNode = current.Node as ItemsGeneratorNode;
if (itemsNode != null)
{
var index = itemsNode.Items.IndexOf(item);
if (index >= 0)
{
index += itemsNode.CountDetailsBeforeDataIndex(index);
// Item is directly from this items node... then return the appropriate index!
m_state = current;
this.EnsureState();
return(index + current.Index);
}
// If the item is from a detail, then I don't want to "use" it!!!
// but continue looping.... to find occurances of this item somewhere else in the tree.
}
else
{
var collectionNode = current.Node as CollectionGeneratorNode;
if (collectionNode != null)
{
var index = collectionNode.IndexOf(item);
if (index >= 0)
{
m_state = current;
this.EnsureState();
return(index + current.Index);
}
}
}
// If we reach this point, it's because the item we are looking
// for is not in this node... Try to access the child
if (!GeneratorNodeHelper.MoveToChild(ref current))
{
// Try "advancing" to the next item.
if (!GeneratorNodeHelper.MoveToFollowing(ref current))
{
break;
}
}
}
return(-1);
}
internal bool MoveToEnd()
{
// We call MoveToNext instead of MoveToEnd because MoveToEnd includes the indexes of the last node.
while (GeneratorNodeHelper.MoveToNext(ref m_state))
{
}
this.EnsureState();
return(true);
}
private static bool MoveToFollowing(ref State state)
{
while (!GeneratorNodeHelper.MoveToNext(ref state))
{
if (!GeneratorNodeHelper.MoveToParent(ref state))
{
return(false);
}
}
return(true);
}
private static bool MoveToPreceding(ref State state)
{
while (!GeneratorNodeHelper.MoveToPrevious(ref state))
{
if (!GeneratorNodeHelper.MoveToParent(ref state))
{
return(false);
}
}
return(true);
}
private void NotifyImmediateChildren(bool value)
{
if (this.Child != null)
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper(this.Child, 0, 0); //index not important
nodeHelper.MoveToEnd();
do
{
nodeHelper.CurrentNode.NotifyExpansionStateChanged(value);
}while(nodeHelper.MoveToPrevious() == true);
}
}
internal bool FindNode(GeneratorNode node)
{
if (node == null)
{
throw new ArgumentNullException("node");
}
var success = GeneratorNodeHelper.FindNode(ref m_state, node);
this.EnsureState();
return(success);
}
//Note: this function will not check for the presence of the group in the details for Items nodes.
internal bool FindGroup(CollectionViewGroup group)
{
if (group == null)
{
return(false);
}
var current = m_state;
while (true)
{
var groupNode = current.Node as GroupGeneratorNode;
if (groupNode != null)
{
if (groupNode.CollectionViewGroup == group)
{
break;
}
if (!groupNode.CollectionViewGroup.IsBottomLevel)
{
if (!GeneratorNodeHelper.MoveToChild(ref current, false))
{
return(false);
}
}
else
{
if (!GeneratorNodeHelper.MoveToFollowing(ref current))
{
return(false);
}
}
}
else
{
// There is nothing under a non GroupGeneratorNode, try to move Next node in the list.
if (!GeneratorNodeHelper.MoveToFollowing(ref current))
{
return(false);
}
}
}
m_state = current;
this.EnsureState();
return(true);
}
private static bool MoveToParent(ref State state)
{
if (state.Node.Level == 0)
{
return(false);
}
GeneratorNodeHelper.MoveToFirst(ref state);
state.Node = state.Node.Parent;
Debug.Assert(state.Node != null);
return(true);
}
internal ReadOnlyCollection <Group> GetImmediateUIGroups(int generatorCurrentGeneration)
{
if ((m_cachedGeneratorCurrentGeneration != generatorCurrentGeneration) ||
(m_readOnlyImmediateUIGroups == null))
{
Debug.WriteLineIf(((m_cachedGeneratorCurrentGeneration != generatorCurrentGeneration) && (m_readOnlyImmediateUIGroups == null)),
"Creating Groups collection since generator version differs AND ReadOnlyCollection is null.");
Debug.WriteLineIf(((m_cachedGeneratorCurrentGeneration != generatorCurrentGeneration) && (m_readOnlyImmediateUIGroups != null)),
"Creating Groups collection since generator version differs.");
Debug.WriteLineIf(((m_cachedGeneratorCurrentGeneration == generatorCurrentGeneration) && (m_readOnlyImmediateUIGroups == null)),
"Creating Groups collection even if generator version is the same, since ReadOnlyCollection is null.");
m_cachedGeneratorCurrentGeneration = generatorCurrentGeneration;
// Ensure collections.
if (m_immediateUIGroups == null)
{
Debug.Assert(m_readOnlyImmediateUIGroups == null);
m_immediateUIGroups = new Collection <Group>();
m_readOnlyImmediateUIGroups = new ReadOnlyCollection <Group>(m_immediateUIGroups);
}
else
{
Debug.Assert(m_readOnlyImmediateUIGroups != null);
m_immediateUIGroups.Clear();
}
// Recalculate.
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper(this, 0, 0); //index is not important
while (nodeHelper.MoveToNext())
{
GroupGeneratorNode groupGeneratorNode = nodeHelper.CurrentNode as GroupGeneratorNode;
if (groupGeneratorNode == null)
{
continue;
}
m_immediateUIGroups.Add(groupGeneratorNode.UIGroup);
}
}
return(m_readOnlyImmediateUIGroups);
}
public bool ReverseCalculateIndex()
{
// index need to be 0, as I will use the value from the index once I backtracked all the way to the root.
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper(this.CurrentNode, 0, 0);
while ((nodeHelper.CurrentNode.Previous != null) || (nodeHelper.CurrentNode.Parent != null))
{
if (!nodeHelper.MoveToPrevious())
{
nodeHelper.MoveToParent();
}
}
m_index = Math.Abs(nodeHelper.Index);
m_sourceDataIndex = Math.Abs(nodeHelper.SourceDataIndex);
return(true);
}
public static GeneratorNode EvaluateChain(GeneratorNode chainStart, out int totalChildCount, out int chainLength)
{
//if we insert a chain of nodes, this GeneratorNodeHelper will help us
GeneratorNodeHelper newHelper = new GeneratorNodeHelper(chainStart, 0, 0);
//first determine the total number of childs from this "node"
totalChildCount = 0;
chainLength = 0;
do
{
totalChildCount += newHelper.CurrentNode.ItemCount;
chainLength++;
}while(newHelper.MoveToNext());
//then, since we moved at the end of the "chain"
return(newHelper.CurrentNode);
}
private static State FindNodeLocation(GeneratorNode node)
{
var state = new State(node, 0, 0);
while (true)
{
GeneratorNodeHelper.MoveToFirst(ref state);
if (!GeneratorNodeHelper.MoveToParent(ref state))
{
break;
}
}
Debug.Assert(state.Index <= 0);
Debug.Assert(state.DataIndex <= 0);
return(new State(node, -state.Index, -state.DataIndex));
}
private static bool FindNode(ref State state, GeneratorNode node)
{
if (state.Node == node)
{
return(true);
}
var from = state;
var fromLevel = state.Node.Level;
var to = new State(node, 0, 0);
var toLevel = node.Level;
while (from.Node != to.Node)
{
if (fromLevel > toLevel)
{
if (!GeneratorNodeHelper.MoveToParent(ref from))
{
return(false);
}
fromLevel = from.Node.Level;
}
else
{
if (!GeneratorNodeHelper.MoveToPrevious(ref to))
{
if (!GeneratorNodeHelper.MoveToParent(ref to))
{
return(false);
}
toLevel = to.Node.Level;
}
}
}
state.Node = node;
state.Index = from.Index - to.Index;
state.DataIndex = from.DataIndex - to.DataIndex;
return(true);
}
public bool MoveBackward()
{
bool recurseGroup = true;
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper(m_currentNode, m_index, m_sourceDataIndex);
do
{
GroupGeneratorNode groupNode = nodeHelper.CurrentNode as GroupGeneratorNode;
if ((groupNode == null) && (nodeHelper.CurrentNode != m_currentNode) && (nodeHelper.CurrentNode.ItemCount != 0))
{
m_currentNode = nodeHelper.CurrentNode;
m_index = nodeHelper.Index;
m_sourceDataIndex = nodeHelper.SourceDataIndex;
return(true);
}
if ((recurseGroup) && (nodeHelper.MoveToChild()))
{
nodeHelper.MoveToEnd();
continue;
}
recurseGroup = true;
if (nodeHelper.MoveToPrevious())
{
continue;
}
if (nodeHelper.MoveToParent())
{
recurseGroup = false;
continue;
}
break;
}while(true);
return(false);
}
internal static HeadersFootersGeneratorNode GetSameLevelFirstHeaderNode( GroupGeneratorNode generatorNode )
{
HeadersFootersGeneratorNode headerGeneratorNode = null;
GroupGeneratorNode parentGroupGeneratorNode = generatorNode.Parent as GroupGeneratorNode;
if( parentGroupGeneratorNode == null )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( generatorNode, 0, 0 ); //index is not important
if( nodeHelper.MoveToFirst() )
headerGeneratorNode = nodeHelper.CurrentNode as HeadersFootersGeneratorNode;
}
else
{
headerGeneratorNode = parentGroupGeneratorNode.Child as HeadersFootersGeneratorNode;
}
return headerGeneratorNode;
}
internal bool InsertBefore(GeneratorNode insert)
{
if (insert == null)
{
throw new DataGridInternalException("GeneratorNode is null");
}
var insertionCount = default(int);
var chainLength = default(int);
var insertLast = GeneratorNodeHelper.EvaluateChain(insert, out insertionCount, out chainLength);
var previousNode = m_state.Node.Previous;
if (previousNode != null)
{
previousNode.Next = insert;
}
insert.Previous = previousNode;
m_state.Node.Previous = insertLast;
insertLast.Next = m_state.Node;
var parentGroup = insert.Parent as GroupGeneratorNode;
if (parentGroup != null)
{
if (parentGroup.Child == m_state.Node)
{
parentGroup.Child = insert;
}
}
// Move the current to the first item inserted.
// No need to update the indexes since they will still be with the correct value.
m_state.Node = insert;
this.EnsureState();
return(true);
}
private static bool FindNodeForIndex(ref State state, int index)
{
var current = state;
// The algo is a single drill-down... for optimized performance..
// It first tries to go horizontally in the tree and then drills-down if it can.
while (true)
{
var itemCount = current.Node.ItemCount;
// Verify if the current node contains ( directly or its children ) the required index
if (index < current.Index + itemCount)
{
// A Group node is the only node that can have children is by definition empty... let's dig deeper.
// If we cannot travel deeper, then this node is the closest we get.
if (!GeneratorNodeHelper.MoveToChild(ref current))
{
break;
}
}
else if ((index == current.Index) && (itemCount != 0))
{
break;
}
else
{
if (!GeneratorNodeHelper.MoveToNext(ref current))
{
return(false);
}
}
}
state.Node = current.Node;
state.Index = current.Index;
state.DataIndex = current.DataIndex;
return(true);
}
internal static HeadersFootersGeneratorNode GetSameLevelFirstHeaderNode(GroupGeneratorNode generatorNode)
{
HeadersFootersGeneratorNode headerGeneratorNode = null;
GroupGeneratorNode parentGroupGeneratorNode = generatorNode.Parent as GroupGeneratorNode;
if (parentGroupGeneratorNode == null)
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper(generatorNode, 0, 0); //index is not important
if (nodeHelper.MoveToFirst())
{
headerGeneratorNode = nodeHelper.CurrentNode as HeadersFootersGeneratorNode;
}
}
else
{
headerGeneratorNode = parentGroupGeneratorNode.Child as HeadersFootersGeneratorNode;
}
return(headerGeneratorNode);
}
public bool InsertBefore(GeneratorNode insert)
{
if (insert == null)
{
throw new DataGridInternalException();
}
int insertionCount;
int chainLength;
GeneratorNode insertLast = GeneratorNodeHelper.EvaluateChain(insert, out insertionCount, out chainLength);
GeneratorNode previous = m_currentNode.Previous;
if (previous != null)
{
previous.Next = insert;
}
insert.Previous = previous;
m_currentNode.Previous = insertLast;
insertLast.Next = m_currentNode;
GroupGeneratorNode parentGroup = insert.Parent as GroupGeneratorNode;
if (parentGroup != null)
{
if (parentGroup.Child == m_currentNode)
{
parentGroup.Child = insert;
}
}
// Move the current to the first item inserted.
// No need to change m_index, m_sourceDataIndex since they will still be with the correct value.
m_currentNode = insert;
return(true);
}
internal object FindIndex(int index)
{
var current = m_state;
while (true)
{
if (index < current.Index + current.Node.ItemCount)
{
var itemsNode = current.Node as CollectionGeneratorNode;
if (itemsNode != null)
{
m_state = current;
this.EnsureState();
return(itemsNode.GetAt(index - current.Index));
}
if (!GeneratorNodeHelper.MoveToChild(ref current))
{
break;
}
}
else
{
// If we reach this point, it's because the item we are looking for is not in this node... Try to access the child.
// No need to check for childs, since the condition above would catch it (childs part of ItemCount).
if (!GeneratorNodeHelper.MoveToFollowing(ref current))
{
break;
}
}
}
return(null);
}
private bool TryGetParentGroupFromItemHelper( object item, out CollectionViewGroup collectionViewGroup )
{
//This helper method is used to simplify previous code flow of the TryGetParentGroupFromItem method.
collectionViewGroup = null;
//-----------------------------------------------
//1 - First check is to see of the item is a CVG.
//-----------------------------------------------
CollectionViewGroup groupItem = item as CollectionViewGroup;
if( groupItem != null )
{
Group group = this.GetGroupFromCollectionViewGroup( groupItem );
if( group != null )
{
GroupGeneratorNode groupGeneratorNode = group.GeneratorNode;
if( groupGeneratorNode.Parent == null )
{
//no parent for speficied item.
return true;
}
//if the nodeHelper was able to locate the content, use the nodeHelper's CurrentNode as the node for the item.
collectionViewGroup = ( ( GroupGeneratorNode )groupGeneratorNode.Parent ).CollectionViewGroup;
return true;
}
//item is a CVG, but is not present in the generator!
return false;
}
//-----------------------------------------------
//2 - Second check is to see if the item is already in the generated list
//-----------------------------------------------
//item might be in the "generated" list... much quicker to find-out if it is!
//note: if the item belongs to a detail, then it will be excluded from the "fast" algo.
int itemGenPosIndex = this.FindFirstGeneratedIndexForLocalItem( item );
if( itemGenPosIndex != -1 )
{
//item was generated and was not from a DetailGeneratorNode
if( m_genPosToNode[ itemGenPosIndex ].Parent == null )
{
//no parent for speficied item.
return true;
}
collectionViewGroup = ( ( GroupGeneratorNode )m_genPosToNode[ itemGenPosIndex ].Parent ).CollectionViewGroup;
return true;
}
//-----------------------------------------------
//3 - Third check is to check of the item is a GroupHeaderFooterItem
//-----------------------------------------------
if( item.GetType() == typeof( GroupHeaderFooterItem ) )
{
GroupHeaderFooterItem groupHeaderFooterItem = ( GroupHeaderFooterItem )item;
CollectionViewGroup parentGroup = groupHeaderFooterItem.Group;
if( this.GetGroupFromCollectionViewGroup( parentGroup ) != null )
{
//since the goal is the find the parentGroup from the item passed (which is a GroupHeader or GroupFooter), then the Group
//is what I am looking for.
collectionViewGroup = parentGroup;
return true;
}
//Item was a GroupHeaderFooterItem but was not part of the genreator!
return false;
}
//-----------------------------------------------
//4 - Final Check
//-----------------------------------------------
//if the item was not generated, then try to find the item as is within the generator's content
GeneratorNodeHelper finalNodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
if( finalNodeHelper.AbsoluteFindItem( item ) )
{
//item was not generated but was part of this generator
if( finalNodeHelper.CurrentNode.Parent == null )
{
//no parent for speficied item.
return true;
}
collectionViewGroup = ( ( GroupGeneratorNode )finalNodeHelper.CurrentNode.Parent ).CollectionViewGroup;
return true;
}
else
{
return false;
}
//Default function behavior, if nobody else returned, then the function did not work as intended... as each "block" is supposed to return a value...
throw new DataGridInternalException();
}
private void OnGeneratorNodeGroupsCollectionChanged( object sender, NotifyCollectionChangedEventArgs e )
{
if( this.Status == GeneratorStatus.GeneratingContainers )
{
throw new InvalidOperationException( "Cannot perform this operation while the generator is busy generating items" );
}
GroupGeneratorNode node = sender as GroupGeneratorNode;
if( node != null )
{
switch( e.Action )
{
case NotifyCollectionChangedAction.Add:
int addCount;
GeneratorNode addNode = this.HandleParentGroupAddition( node, out addCount, e );
if( node.IsComputedExpanded )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( addNode, 0, 0 );//index not important, will reserve find it.
nodeHelper.ReverseCalculateIndex();
this.IncrementCurrentGenerationCount();
GeneratorPosition genPos = this.GeneratorPositionFromIndex( nodeHelper.Index );
this.SendAddEvent( genPos, nodeHelper.Index, addCount );
}
break;
case NotifyCollectionChangedAction.Move:
if( node.Child == null )
{
throw new DataGridInternalException();
}
else
{
Debug.Assert( e.OldStartingIndex != e.NewStartingIndex, "An attempt was made to move a group to the same location." );
#if LOG
Log.Assert( this, e.OldStartingIndex != e.NewStartingIndex, "An attempt was made to move a group to the same location." );
#endif
this.HandleSameLevelGroupMove( node.Child, e );
}
break;
case NotifyCollectionChangedAction.Remove:
if( node.Child == null )
{
throw new DataGridInternalException();
}
else
{
int remCount;
int generatedRemCount;
int removeIndex;
List<DependencyObject> removedContainers = new List<DependencyObject>();
GeneratorPosition remPos = this.HandleParentGroupRemove( node, out remCount, out generatedRemCount, out removeIndex, e, removedContainers );
if( node.IsComputedExpanded )
{
this.IncrementCurrentGenerationCount();
this.SendRemoveEvent( remPos, removeIndex, remCount, generatedRemCount, removedContainers );
}
}
break;
case NotifyCollectionChangedAction.Replace:
//if( node.Child == null )
//{
// throw new DataGridInternalException();
//}
//else
//{
// this.HandleGroupReplace( node.Child, e );
//}
//m_currentGeneratorContentGeneration++;
throw new DataGridInternalException();
//break;
case NotifyCollectionChangedAction.Reset:
//m_currentGeneratorContentGeneration++;
throw new DataGridInternalException();
default:
throw new DataGridInternalException();
}
}
}
private int FindGlobalIndexForDetailNode( DetailGeneratorNode detailNode )
{
int retval = -1;
//first thing, loop through the details for the
foreach( KeyValuePair<object, List<DetailGeneratorNode>> masterItemToDetails in m_masterToDetails )
{
//in each master to details entry, try to find the detail node passed
int detailIndex = masterItemToDetails.Value.IndexOf( detailNode );
if( detailIndex != -1 )
{
//if the desired detailNode is present for this master item... then evaluate it...
int detailNodeOffset = 0;
for( int i = 0; i < detailIndex; i++ )
{
detailNodeOffset += masterItemToDetails.Value[ i ].ItemCount - 1;
}
int index = m_genPosToItem.IndexOf( masterItemToDetails.Key );
int masterItemIndex;
if( index > -1 )
{
masterItemIndex = m_genPosToIndex[ index ];
}
else
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
masterItemIndex = nodeHelper.FindItem( masterItemToDetails.Key );
}
if( masterItemIndex == -1 )
throw new DataGridInternalException();
retval = detailNodeOffset + masterItemIndex + detailIndex + 1;
//leave the top level loop
break;
}
}
return retval;
}
private void HandleDetailMoveRemove( object masterItem, DetailGeneratorNode detailNode, CustomGeneratorChangedEventArgs e )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
int masterIndex = nodeHelper.FindItem( masterItem );
//If the masterItem is part of an ItemsGeneratorNode which is below a collapsed group, masterIndex will be -1
if( masterIndex == -1 )
{
//in that case, I need to determine the appropriate masterNode another way
nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
if( !nodeHelper.Contains( masterItem ) )
throw new DataGridInternalException();
}
ItemsGeneratorNode masterNode = nodeHelper.CurrentNode as ItemsGeneratorNode;
Debug.Assert( masterNode != null, "masterNode != null" );
#if LOG
Log.Assert( this, masterNode != null, "masterNode != null" );
#endif
int globalIndex = -1;
GeneratorPosition convertedGeneratorPosition = ( masterIndex != -1 ) ? this.ConvertDetailGeneratorPosition( e.OldPosition, masterItem, detailNode, out globalIndex ) : new GeneratorPosition( -1, 1 );
if( masterIndex != -1 )
{
this.RemoveDetailContainers( convertedGeneratorPosition, e.ItemUICount );
}
if( e.Action == NotifyCollectionChangedAction.Remove )
{
masterNode.AdjustItemCount( -e.ItemCount );
detailNode.UpdateItemCount();
}
this.IncrementCurrentGenerationCount();
if( masterIndex != -1 )
{
this.SendRemoveEvent( convertedGeneratorPosition, globalIndex, e.ItemCount, e.ItemUICount, e.RemovedContainers );
}
}
public int GetGroupIndex( Group group )
{
if( group == null )
throw new ArgumentNullException( "group" );
this.EnsureNodeTreeCreated();
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
if( nodeHelper.FindGroup( group.CollectionViewGroup ) )
return nodeHelper.Index;
//the item was not found in this generator's content... check all the detail generators
foreach( KeyValuePair<object, List<DetailGeneratorNode>> itemToDetails in m_masterToDetails )
{
foreach( DetailGeneratorNode detailNode in itemToDetails.Value )
{
int groupIndex = detailNode.DetailGenerator.GetGroupIndex( group );
if( groupIndex > -1 )
return groupIndex + this.FindGlobalIndexForDetailNode( detailNode );
}
}
return -1;
}
public Group GetGroupFromItem( object item )
{
Group retval = null;
GeneratorNode nodeForItem = null;
this.EnsureNodeTreeCreated();
//item might be in the "generated" list... much quicker to find-out if it is!
int itemGenPosIndex = this.FindFirstGeneratedIndexForLocalItem( item );
if( itemGenPosIndex != -1 )
{
//item is generated...
nodeForItem = m_genPosToNode[ itemGenPosIndex ];
}
else
{
//only try to find the item is the generator has some content...
if( m_startNode != null )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
if( nodeHelper.Contains( item ) ) //NOTE: this will only return items directly contained in this generator (not from details )
{
//if the nodeHelper was able to locate the content, use the nodeHelper's CurrentNode as the node for the item.
nodeForItem = nodeHelper.CurrentNode;
}
else
{
throw new InvalidOperationException( "An attempt was made to retrieve the group of an item that does not belong to the generator." );
}
}
}
if( nodeForItem != null )
{
GroupGeneratorNode parentGroup = nodeForItem.Parent as GroupGeneratorNode;
if( parentGroup != null )
{
retval = parentGroup.UIGroup;
}
}
return retval;
}
private GeneratorNode HandleParentGroupAddition( GeneratorNode parent, out int countAdded, NotifyCollectionChangedEventArgs e )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( parent, 0, 0 ); //do not care about index (for now).
//start by moving to the first child... of the node (GroupHeaders node, most probably).
if( !nodeHelper.MoveToChild( false ) ) //case 120137: false parameter is to prevent skipping over a collapsed node (item count 0 )
{
//could not advance to the child item so there is no items to be removed...
throw new DataGridInternalException();
}
return this.HandleSameLevelGroupAddition( nodeHelper.CurrentNode, out countAdded, e );
}
private void HandleItemRemoveMoveReplace( ItemsGeneratorNode node, NotifyCollectionChangedEventArgs e )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( node, 0, 0 ); //index not important for now.
nodeHelper.ReverseCalculateIndex();
node.AdjustItemCount( -e.OldItems.Count );
node.AdjustLeafCount( -e.OldItems.Count );
int nodeStartIndex = e.OldStartingIndex;
int nodeEndIndex = nodeStartIndex + e.OldItems.Count - 1;
int detailCountToRemove = CustomItemContainerGenerator.ComputeDetailsCount( node, nodeStartIndex, nodeEndIndex );
int detailCountBeforeRemovedItems = 0;
if( nodeStartIndex > 0 )
{
detailCountBeforeRemovedItems = CustomItemContainerGenerator.ComputeDetailsCount( node, 0, nodeStartIndex - 1 );
}
int startIndex = nodeHelper.Index + e.OldStartingIndex + detailCountBeforeRemovedItems;
int endIndex = startIndex + detailCountToRemove + e.OldItems.Count - 1;
int removeCount = e.OldItems.Count + detailCountToRemove;
int replaceCount = ( e.Action == NotifyCollectionChangedAction.Replace ) ? e.NewItems.Count : 0;
// *** RemoveDetails must be done before GeneratorPositionFromIndex, since GeneratorPositionFromIndex will indirectly do a RemapFloatingDetails
// *** that will cause the index to already be rectified and make a double rectification to occurs.
//Remove the details from the ItemsGeneratorNode and re-index the other details appropriatly.
this.RemoveDetails( node, nodeStartIndex, nodeEndIndex, replaceCount );
GeneratorPosition removeGenPos = this.GeneratorPositionFromIndex( startIndex );
//Try to remap the old item for detail remapping (will do nothing if item has no details )
foreach( object oldItem in e.OldItems )
{
this.QueueDetailItemForRemapping( oldItem );
}
//if the node is totally expanded
if( node.IsComputedExpanded )
{
List<DependencyObject> removedContainers = new List<DependencyObject>();
int genRemCount = this.RemoveGeneratedItems( startIndex, endIndex, removedContainers );
this.IncrementCurrentGenerationCount();
this.SendRemoveEvent( removeGenPos, startIndex, removeCount, genRemCount, removedContainers );
}
//then, based on the action that was performed (move, replace or remove)
switch( e.Action )
{
case NotifyCollectionChangedAction.Move:
this.OffsetDetails( node, e.NewStartingIndex, e.NewItems.Count );
this.HandleItemMoveRemoveReplaceHelper( node, e, nodeHelper.Index );
break;
case NotifyCollectionChangedAction.Replace:
this.HandleItemMoveRemoveReplaceHelper( node, e, nodeHelper.Index );
break;
case NotifyCollectionChangedAction.Remove:
// Do nothing!
break;
case NotifyCollectionChangedAction.Add:
case NotifyCollectionChangedAction.Reset:
default:
throw new DataGridInternalException();
}
}
private void HandleSameLevelGroupMove( GeneratorNode node, NotifyCollectionChangedEventArgs e )
{
GroupGeneratorNode parentGroup = node.Parent as GroupGeneratorNode;
//Start a NodeHelper on the first child of the node where the move occured.
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( node, 0, 0 );
nodeHelper.ReverseCalculateIndex(); //determine index of the node.
//Advance to the first "Group" node (skip the GroupHEaders)
while( !( nodeHelper.CurrentNode is GroupGeneratorNode ) )
{
if( !nodeHelper.MoveToNext() )
throw new DataGridInternalException();
}
//then move up to the removal start point.
if( !nodeHelper.MoveToNextBy( e.OldStartingIndex ) )
{
throw new DataGridInternalException();
}
//remember the current node as the start point of the move (will be used when "extracting the chain")
GeneratorNode startNode = nodeHelper.CurrentNode;
//also remember the index of the node, to calculate range of elements to remove (containers )
int startIndex = nodeHelper.Index;
//then, cumulate the total number of items in the groups concerned
int totalCountRemoved = 0;
node = this.ProcessGroupRemoval( startNode, e.OldItems.Count, false, out totalCountRemoved );
//send a message to the panel to remove the visual elements concerned
GeneratorPosition removeGenPos = this.GeneratorPositionFromIndex( startIndex );
List<DependencyObject> removedContainers = new List<DependencyObject>();
int genCountRemoved = this.RemoveGeneratedItems( startIndex, startIndex + totalCountRemoved - 1, removedContainers );
this.SendRemoveEvent( removeGenPos, startIndex, totalCountRemoved, genCountRemoved, removedContainers );
//reset the node parameter for the "re-addition"
node = ( parentGroup != null ) ? parentGroup.Child : m_firstItem;
if( node == null )
throw new DataGridInternalException();
//Once the chain was pulled out, re-insert it at the appropriate location.
nodeHelper = new GeneratorNodeHelper( node, 0, 0 ); //do not care about the index for what I need
//Advance to the first "Group" node (skip the GroupHEaders)
while( !( nodeHelper.CurrentNode is GroupGeneratorNode ) )
{
if( !nodeHelper.MoveToNext() )
throw new DataGridInternalException();
}
bool insertBefore = nodeHelper.MoveToNextBy( e.NewStartingIndex );
if( insertBefore )
{
if( nodeHelper.CurrentNode == m_firstItem )
{
if( m_startNode == m_firstItem )
{
m_startNode = startNode;
}
m_firstItem = startNode;
}
//reinsert the chain at the specified location.
nodeHelper.InsertBefore( startNode );
}
else
{
nodeHelper.InsertAfter( startNode );
}
//and finally, call to increment the generation count for the generator content
this.IncrementCurrentGenerationCount();
}
private void OnGeneratorNodeExpansionStateChanged( object sender, ExpansionStateChangedEventArgs e )
{
//throw an error is the Generator is actually busy generating!
if( this.Status == GeneratorStatus.GeneratingContainers )
{
throw new InvalidOperationException( "Cannot perform this operation while the generator is busy generating items" );
}
GeneratorNode node = sender as GeneratorNode;
Debug.Assert( node != null, "node != null" );
#if LOG
Log.Assert( this, node != null, "node != null" );
#endif
if( node == null )
return;
GroupGeneratorNode changedNode = node.Parent as GroupGeneratorNode;
Debug.Assert( changedNode != null, "changedNode != null" ); //should never be null, as the "node" is supposed to be the child node of this one.
#if LOG
Log.Assert( this, changedNode != null, "changedNode != null" ); //should never be null, as the "node" is supposed to be the child node of this one.
#endif
//Determine if the changedNode is "below" a collapsed group (because if so, I don't need any sort of notification or removal ).
GroupGeneratorNode parentGroupNode = changedNode.Parent as GroupGeneratorNode;
if( ( parentGroupNode != null ) && ( !parentGroupNode.IsComputedExpanded ) )
return;
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( node, 0, 0 );
nodeHelper.ReverseCalculateIndex();
//if the node was "Collapsed"
if( !e.NewExpansionState )
{
int removeCount = e.Count;
int startIndex = nodeHelper.Index + e.IndexOffset;
GeneratorPosition removeGenPos = this.GeneratorPositionFromIndex( startIndex );
List<DependencyObject> removedContainers = new List<DependencyObject>();
//remove the Generated items between the appropriate indexes
int removeUICount = this.RemoveGeneratedItems( startIndex, startIndex + removeCount - 1, removedContainers );
if( removeCount > 0 )
{
//send the event so the panel can remove the group elements
this.SendRemoveEvent( removeGenPos, startIndex, removeCount, removeUICount, removedContainers );
}
}
//if the node was "Expanded"
else
{
int addCount = e.Count;
int startIndex = nodeHelper.Index + e.IndexOffset;
GeneratorPosition addGenPos = this.GeneratorPositionFromIndex( startIndex );
if( addCount > 0 )
{
//send the event so the panel can add the group elements
this.SendAddEvent( addGenPos, startIndex, addCount );
}
}
}
private void OnGroupsChanged( object sender, NotifyCollectionChangedEventArgs e )
{
// Avoid re-entrance when processing a global reset
if( m_isProcessingGlobalResetOrRemovingAllGeneratedItemsDisposableCount > 0 )
return;
if( this.Status == GeneratorStatus.GeneratingContainers )
{
throw new InvalidOperationException( "Cannot perform this operation while the generator is busy generating items" );
}
//this fonction is only used to process the content of the DataGridControl.Items.Groups collection...
// for the CollectionChanged event of branch groups ( IsBottomLevel = false ), refer to the
// OnBranchGroupsChanged fonction
switch( e.Action )
{
case NotifyCollectionChangedAction.Add:
int addCount = e.NewItems.Count;
GeneratorPosition genPos = new GeneratorPosition( -1, 1 ); //this would map to the first item in the list if not generated.
int addIndex = -1;
//if the first item is empty, do not do anything, the structure will be generated when the generator is started!
if( m_firstItem != null )
{
//The only moment where the m_firstItem is null is typically when a reset occured...
//other moments is when there are 0 items (in which case, the.
GeneratorNode addNode = this.HandleSameLevelGroupAddition( m_firstItem, out addCount, e );
this.IncrementCurrentGenerationCount();
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( addNode, 0, 0 );//index not important, will reserve find it.
nodeHelper.ReverseCalculateIndex();
addIndex = nodeHelper.Index;
genPos = this.GeneratorPositionFromIndex( addIndex );
}
this.SendAddEvent( genPos, addIndex, addCount );
break;
case NotifyCollectionChangedAction.Move:
if( m_firstItem != null )
{
if( !( m_firstItem is GroupGeneratorNode ) )
{
throw new DataGridInternalException();
}
Debug.Assert( e.OldStartingIndex != e.NewStartingIndex, "An attempt was made to move a group to the same location." );
#if LOG
Log.Assert( this, e.OldStartingIndex != e.NewStartingIndex, "An attempt was made to move a group to the same location." );
#endif
this.HandleSameLevelGroupMove( m_firstItem, e );
}
break;
case NotifyCollectionChangedAction.Remove:
if( m_firstItem != null )
{
if( !( m_firstItem is GroupGeneratorNode ) )
{
throw new DataGridInternalException();
}
int remCount;
int generatedRemCount;
int removeIndex;
List<DependencyObject> removedContainers = new List<DependencyObject>();
GeneratorPosition remPos = this.HandleSameLevelGroupRemove( m_firstItem, out remCount, out generatedRemCount, out removeIndex, e, removedContainers );
//there is no need to check if the parent node is expanded or not... since the first level of group cannot be collapsed.
this.IncrementCurrentGenerationCount();
this.SendRemoveEvent( remPos, removeIndex, remCount, generatedRemCount, removedContainers );
}
break;
case NotifyCollectionChangedAction.Replace:
throw new NotSupportedException( "Replace not supported at the moment on groups!!!" );
//break;
case NotifyCollectionChangedAction.Reset:
//I'm forced to handle it specifically since the Panel will AUTOMATICALLY clear its children
this.HandleGlobalItemsReset();
break;
default:
throw new DataGridInternalException();
}
}
void ICustomItemContainerGenerator.SetCurrentIndex( int newCurrentIndex )
{
// This method enables the possibility for the "ItemsHost" panels to set the current item of the
// DataGridControl. This is required for scenarios such as the CardflowItemsHost.
this.EnsureNodeTreeCreated();
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
//First, locate the item within the Generator.
object newCurrentItem = nodeHelper.FindIndex( newCurrentIndex );
if( newCurrentItem == null )
throw new InvalidOperationException( "An attempt was made to access an item at an index that does not correspond to an item." );
//Then, if the item is within an ItemsNode, check if it belongs to a detail
ItemsGeneratorNode itemsNode = nodeHelper.CurrentNode as ItemsGeneratorNode;
if( itemsNode != null )
{
int masterIndex;
int detailIndex;
int detailNodeIndex;
DetailGeneratorNode detailNode = itemsNode.GetDetailNodeForIndex( newCurrentIndex - nodeHelper.Index, out masterIndex, out detailIndex, out detailNodeIndex );
//If it belongs to a detail
if( detailNode != null )
{
//call recursively the SetCurrentIndex method on the detail generator to ensure that if the item
//belongs to a sub-generator of the detail generator, then the appropriate DataGridContext will get invoked.
ICustomItemContainerGenerator detailGenerator = detailNode.DetailGenerator;
detailGenerator.SetCurrentIndex( detailIndex );
return;
}
}
//If the item is not within an ItemsNode or not within a detail
//then set it current within its context.
m_dataGridContext.SetCurrentItemCore( newCurrentItem, false, false );
}
internal int GetStickyFooterCountForIndex(
int index,
bool areFootersSticky,
bool areGroupFootersSticky )
{
int stickyFooterCount = 0;
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
if( !nodeHelper.FindNodeForIndex( index ) )
{
// Unable to find the node, no sticky header for this node
return 0;
}
GeneratorNode indexNode = nodeHelper.CurrentNode;
ItemsGeneratorNode itemsGeneratorNode = indexNode as ItemsGeneratorNode;
// We found an ItemsGeneratorNode
if( itemsGeneratorNode != null )
{
GeneratorNode innerNode = itemsGeneratorNode.GetDetailNodeForIndex( index - nodeHelper.Index );
DetailGeneratorNode detailNode = innerNode as DetailGeneratorNode;
if( detailNode != null )
{
int detailFirstRealizedIndex = this.FindGlobalIndexForDetailNode( detailNode );
int correctedIndex = index - detailFirstRealizedIndex;
Debug.Assert( correctedIndex >= 0, "correctedIndex >= 0 .. 2" );
#if LOG
Log.Assert( this, correctedIndex >= 0, "correctedIndex >= 0 .. 2" );
#endif
stickyFooterCount +=
detailNode.DetailGenerator.GetStickyFooterCountForIndex( correctedIndex,
areFootersSticky,
areGroupFootersSticky );
}
}
// We want to find the HeaderFooterGeneratorNode for the container
// node. This is to find the footers for the container.
nodeHelper.MoveToEnd();
HeadersFootersGeneratorNode footersNode = nodeHelper.CurrentNode as HeadersFootersGeneratorNode;
// There is no footers to generate if the item count of the node is 0.
if( footersNode.ItemCount > 0 )
{
if( ( ( footersNode.Parent == null ) && ( areFootersSticky ) )
|| ( ( footersNode.Parent is GroupGeneratorNode ) && ( areGroupFootersSticky ) ) )
{
// We are generating sticky footers for a container that is already
// part of the footers, we need to handle it differently.
stickyFooterCount += this.GetStickyFooterCountForNode( footersNode,
nodeHelper.Index,
index,
( footersNode != indexNode ) );
}
}
// We must also find the bottom most footers for our level of detail and, if they need to be sticky,
// we will generate the containers and add them the to list.
HeadersFootersGeneratorNode bottomFootersNode = this.GetDetailFootersNode( nodeHelper );
if( ( bottomFootersNode != null )
&& ( bottomFootersNode != footersNode )
&& ( bottomFootersNode.ItemCount > 0 )
&& ( areFootersSticky ) )
{
stickyFooterCount += this.GetStickyFooterCountForNode( bottomFootersNode, nodeHelper.Index );
}
return stickyFooterCount;
}
private GeneratorNode HandleSameLevelGroupAddition( GeneratorNode firstChild, out int countAdded, NotifyCollectionChangedEventArgs e )
{
Debug.Assert( ( ( firstChild.Parent == null ) || ( firstChild.Parent is GroupGeneratorNode ) ), "parent of the node should be a GroupGeneratorNode" );
#if LOG
Log.Assert( this, ( ( firstChild.Parent == null ) || ( firstChild.Parent is GroupGeneratorNode ) ), "parent of the node should be a GroupGeneratorNode" );
#endif
GeneratorNode newNodeChain = this.CreateGroupListFromCollection( e.NewItems, firstChild.Parent );
countAdded = 0;
if( newNodeChain != null )
{
int chainLength;
GeneratorNodeHelper.EvaluateChain( newNodeChain, out countAdded, out chainLength );
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( firstChild, 0, 0 ); //do not care about index.
//Advance to the first "Group" node (skip the GroupHEaders)
while( !( nodeHelper.CurrentNode is GroupGeneratorNode ) )
{
if( !nodeHelper.MoveToNext() )
{
//if there are no items and no groups in the Group Node, then we will never find a GroupGeneratorNode...
//However, the structure of the group/headers/footers/group headers/groups footers makes it so
//that inserting before the last item (footer/group footer) will place the group at the appropriate location.
break;
}
}
bool insertAfter = false;
//If there is 0 group in the parent group, then this loop will exit without executing the control block once...
for( int i = 0; i < e.NewStartingIndex; i++ )
{
if( !nodeHelper.MoveToNext() )
{
insertAfter = true;
}
}
//if we are inserting past the end of the linked list level.
if( insertAfter )
{
nodeHelper.InsertAfter( newNodeChain );
}
else
{
//we are inserting in the middle of the list
nodeHelper.InsertBefore( newNodeChain );
}
//If the insertion point is the beginning, check that the node pointers are updated properly
if( ( e.NewStartingIndex == 0 ) && ( ( firstChild.Parent == null ) ) )
{
if( m_startNode == m_firstItem )
{
m_startNode = newNodeChain;
}
m_firstItem = newNodeChain;
}
}
return newNodeChain;
}
private void UpdateHeaders( IList headers )
{
//if there was no header prior this udpate.
if( m_firstHeader == null )
{
//create the node(s) that would contain the headers
m_firstHeader = this.CreateHeaders( headers );
int count;
int chainLength;
GeneratorNodeHelper.EvaluateChain( m_firstHeader, out count, out chainLength );
//if there was items present in the linked list.
if( m_startNode != null )
{
//headers are automatically inserted at the beginning
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
nodeHelper.InsertBefore( m_firstHeader );
}
else
{
#if LOG
Log.WriteLine( this, "UpdateHeaders - new tree" );
#endif
}
//set the start node as the first header node.
m_startNode = m_firstHeader;
}
//If the m_firstHeader is not NULL, then there is nothing to do, since the Header node contains an observable collection
//which we monitor otherwise.
}
private void HandleItemAddition( GeneratorNode node, NotifyCollectionChangedEventArgs e )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( node, 0, 0 ); //index not important for now.
node.AdjustItemCount( e.NewItems.Count );
ItemsGeneratorNode itemsNode = node as ItemsGeneratorNode;
if( itemsNode != null )
{
itemsNode.AdjustLeafCount( e.NewItems.Count );
this.OffsetDetails( itemsNode, e.NewStartingIndex, e.NewItems.Count );
}
//if the node is totally expanded
if( node.IsComputedExpanded )
{
nodeHelper.ReverseCalculateIndex();
//invalidate the indexes
this.IncrementCurrentGenerationCount();
int startIndex = nodeHelper.Index + e.NewStartingIndex;
GeneratorPosition addGenPos = this.GeneratorPositionFromIndex( startIndex );
//and send notification message
this.SendAddEvent( addGenPos, startIndex, e.NewItems.Count );
}
}
private void UpdateFooters( IList footers )
{
//if there was no header prior this udpate.
if( m_firstFooter == null )
{
//create the node(s) that would contain the footers
m_firstFooter = this.CreateFooters( footers );
//if there are no footers, then the m_firstFooter will remain null
if( m_firstFooter != null )
{
int count;
int chainLength;
GeneratorNodeHelper.EvaluateChain( m_firstFooter, out count, out chainLength );
//if there was items present in the linked list.
if( m_startNode != null )
{
//since we called ClearFooters earlier, I can just go at the end of the list of items
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
nodeHelper.MoveToEnd();
nodeHelper.InsertAfter( m_firstFooter );
}
else
{
m_startNode = m_firstFooter;
#if LOG
Log.WriteLine( this, "UpdateFooters - new tree" );
#endif
}
}
}
//If the m_firstHeader is not NULL, then there is nothing to do, since the Header node contains an observable collection
//which we monitor otherwise.
}
public object ItemFromIndex( int index )
{
object retval = null;
this.EnsureNodeTreeCreated();
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
retval = nodeHelper.FindIndex( index );
return retval;
}
private GeneratorNode SetupInitialItemsNodes( out int addCount )
{
//TODO ( case 117275 ): Check the amount of time this is executed for a single grid being populated!
GeneratorNode newItemNode = null;
addCount = 0;
this.RefreshGroupsCollection();
//this function should only be called when the m_firstItem is null.
if( m_groupsCollection != null )
{
newItemNode = this.CreateGroupListFromCollection( m_groupsCollection, null );
}
else
{
newItemNode = this.CreateStandaloneItemsNode();
}
//if the node is non-null, then that's because there was items in the collection
if( newItemNode != null )
{
m_firstItem = newItemNode;
int chainLength;
GeneratorNodeHelper.EvaluateChain( m_firstItem, out addCount, out chainLength );
//find the appropriate point to inject the Items nodes...
if( m_startNode != null )
{
//if there is a footer node, then the insertion point is just before the footer node (if there is anything before!)
if( m_firstFooter != null )
{
GeneratorNode originalPrevious = m_firstFooter.Previous;
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_firstFooter, 0, 0 ); //do not care about index!
nodeHelper.InsertBefore( m_firstItem );
if( originalPrevious == null ) //that means that the first footer is the first item
{
m_startNode = newItemNode;
}
}
else if( m_firstHeader != null ) //if there is no footer but some headers, add it at the end.
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_firstHeader, 0, 0 ); //do not care about index!
nodeHelper.MoveToEnd();
nodeHelper.InsertAfter( m_firstItem );
}
else
{
throw new DataGridInternalException(); //this case should not be possible: no header, no footers but there is a startNode
}
}
else
{
m_startNode = m_firstItem;
#if LOG
Log.WriteLine( this, "SetupInitialItemsNodes - new tree" );
#endif
}
}
return newItemNode;
}
private void HandleHeaderFooterRemove( HeadersFootersGeneratorNode node, NotifyCollectionChangedEventArgs e )
{
bool itemsRemoved = false;
node.AdjustItemCount( -e.OldItems.Count );
//if the node is totally expanded
if( node.IsComputedExpanded )
{
GroupGeneratorNode parentGroup = node.Parent as GroupGeneratorNode;
int removeGenPosIndex;
int removeIndex;
foreach( object item in e.OldItems )
{
object realItem = ( parentGroup != null )
? new GroupHeaderFooterItem( parentGroup.CollectionViewGroup, item )
: item;
removeGenPosIndex = m_genPosToItem.IndexOf( realItem );
GeneratorPosition removeGenPos;
// If the value is -1, it means the Header/Footer was not realized when the remove occured.
if( removeGenPosIndex != -1 )
{
removeIndex = m_genPosToIndex[ removeGenPosIndex ];
removeGenPos = new GeneratorPosition( removeGenPosIndex, 0 );
}
else
{
//Since there is no way to get the item's index from the list of generated items, then
//compute it based on the node's index and the event args parameters.
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( node, 0, 0 );
nodeHelper.ReverseCalculateIndex();
removeIndex = nodeHelper.Index + e.OldStartingIndex;
removeGenPos = this.GeneratorPositionFromIndex( removeIndex );
}
List<DependencyObject> removedContainers = new List<DependencyObject>();
this.RemoveGeneratedItems( node, realItem, removedContainers );
this.SendRemoveEvent( removeGenPos, removeIndex, 1, removedContainers.Count, removedContainers );
itemsRemoved = true;
}
this.IncrementCurrentGenerationCount( itemsRemoved );
}
}
private GeneratorNode CreateGroupListFromCollection( IList collection, GeneratorNode parentNode )
{
GeneratorNode rootNode = null;
GeneratorNode previousNode = null;
GroupGeneratorNode actualNode = null;
GeneratorNode childNode = null;
int level = ( parentNode == null ) ? 0 : parentNode.Level + 1;
GroupConfiguration groupConfig;
bool initiallyExpanded;
ObservableCollection<GroupDescription> groupDescriptions = DataGridContext.GetGroupDescriptionsHelper( m_collectionView );
GroupConfigurationSelector groupConfigurationSelector = m_dataGridContext.GroupConfigurationSelector;
foreach( CollectionViewGroup group in collection )
{
groupConfig = GroupConfiguration.GetGroupConfiguration( m_dataGridContext, groupDescriptions, groupConfigurationSelector, level, group );
Debug.Assert( groupConfig != null, "groupConfig != null" );
#if LOG
Log.Assert( this, groupConfig != null, "groupConfig != null" );
#endif
if( groupConfig.UseDefaultHeadersFooters )
groupConfig.AddDefaultHeadersFooters();
initiallyExpanded = groupConfig.InitiallyExpanded;
actualNode = ( GroupGeneratorNode )this.NodeFactory.CreateGroupGeneratorNode( group, parentNode, previousNode, null, groupConfig );
m_groupNodeMappingCache.Add( group, actualNode );
if( rootNode == null )
{
rootNode = actualNode;
}
previousNode = actualNode;
actualNode.UIGroup = new Group( actualNode, group, m_dataGridContext.GroupLevelDescriptions, m_dataGridContext );
//Independently if the Group is the bottom level or not, we need to setup GroupHeaders
childNode = this.SetupGroupHeaders( groupConfig, actualNode );
actualNode.Child = childNode;
GeneratorNodeHelper childNodeHelper = new GeneratorNodeHelper( childNode, 0, 0 ); //do not care about index.
childNodeHelper.MoveToEnd(); //extensibility, just in case SetupGroupHeaders() ever return a node list.
IList<object> subItems = group.GetItems();
//if the node newly created is not the bottom level
if( !group.IsBottomLevel )
{
if( ( subItems != null ) && ( subItems.Count > 0 ) )
{
GeneratorNode subGroupsNode = this.CreateGroupListFromCollection( subItems as IList, actualNode );
if( subGroupsNode != null )
{
childNodeHelper.InsertAfter( subGroupsNode );
}
}
}
else
{
//this is the bottom level, create an Items node
GeneratorNode itemsNode = this.NodeFactory.CreateItemsGeneratorNode( subItems as IList, actualNode, null, null, this );
if( itemsNode != null )
{
childNodeHelper.InsertAfter( itemsNode );
}
}
childNodeHelper.InsertAfter( this.SetupGroupFooters( groupConfig, actualNode ) );
}
return rootNode;
}
private void UpdateGenPosToIndexList()
{
#if LOG
int count = m_genPosToIndex.Count;
int previousIndex = -1;
for( int i = 0; i < count; i++ )
{
int tempIndex = m_genPosToIndex[ i ];
if( tempIndex >= previousIndex )
{
previousIndex = tempIndex;
}
else
{
Debug.Assert( false, "### none sequential index detected (before)" );
Log.Assert( this, false, "### none sequential index detected (before)" );
this.WriteStateInLog();
break;
}
}
#endif
//after the modification to have the item count stored "locally" in the DetailGeneratorNodes,
//it becomes important to have the nodes updated when the layout of the items changes.
if( m_masterToDetails.Count > 0 )
{
foreach( KeyValuePair<object, List<DetailGeneratorNode>> masterToDetails in m_masterToDetails )
{
foreach( DetailGeneratorNode detailNode in masterToDetails.Value )
{
detailNode.UpdateItemCount();
}
}
}
if( m_startNode != null )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 ); //index is 0, since i'm beginning at the start
//(and I want to reindex the whole list)
DetailGeneratorNode cachedDetailNode = null;
int cachedDetailNodeIndex = -1;
int previousDetailIndex = -1;
//loop through the realized items. By design they are present sequentially in the linked list, so I do not need to reset the GeneratorNodeHelper
for( int i = 0; i < m_genPosToItem.Count; i++ )
{
object item = m_genPosToItem[ i ];
DetailGeneratorNode detailNode = m_genPosToNode[ i ] as DetailGeneratorNode;
if( detailNode == null )
{
//find the Item
int tmpIndex = nodeHelper.FindItem( item );
if( tmpIndex != -1 )
{
//set the Index (new) for the item
ItemsGeneratorNode itemsNode = nodeHelper.CurrentNode as ItemsGeneratorNode;
if( itemsNode != null )
{
tmpIndex = nodeHelper.Index + itemsNode.IndexOf( item );
}
m_genPosToIndex[ i ] = tmpIndex;
}
else
{
#if LOG
if( item == null )
{
Log.WriteLine( this, "# UpdateGenPosToIndexList - item not found Dnull" );
}
else
{
Log.WriteLine( this, "# UpdateGenPosToIndexList - Item not found D" + item.GetHashCode() );
}
#endif
//a possible fix for this is to set the index of the "not found" element to the same index as previous item in the generated list...
m_genPosToIndex[ i ] = ( i > 0 ) ? m_genPosToIndex[ i - 1 ] : 0;
//item is not in the linked list... there is a problem, throw.
//throw new DataGridInternalException();
}
}
else //else is detailNode != null
{
if( cachedDetailNode != detailNode )
{
cachedDetailNodeIndex = this.FindGlobalIndexForDetailNode( detailNode );
cachedDetailNode = detailNode;
previousDetailIndex = -1;
}
int detailIndex = detailNode.DetailGenerator.IndexFromRealizedItem( item, previousDetailIndex + 1, out previousDetailIndex );
m_genPosToIndex[ i ] = cachedDetailNodeIndex + detailIndex;
}
} //end for()
}
#if LOG
count = m_genPosToIndex.Count;
previousIndex = -1;
for( int i = 0; i < count; i++ )
{
int tempIndex = m_genPosToIndex[ i ];
if( tempIndex >= previousIndex )
{
previousIndex = tempIndex;
}
else
{
Debug.Assert( false, "### none sequential index detected (after)" );
Log.Assert( this, false, "### none sequential index detected (after)" );
this.WriteStateInLog();
break;
}
}
#endif
}
private GeneratorPosition HandleParentGroupRemove( GeneratorNode parent, out int countRemoved, out int genCountRemoved, out int removeIndex, NotifyCollectionChangedEventArgs e, IList<DependencyObject> removedContainers )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( parent, 0, 0 ); //do not care about index (for now).
// start by moving to the first child... of the node (GroupHeaders node, most probably).
// false parameter is to prevent skipping over a collapsed node (item count 0 )
if( !nodeHelper.MoveToChild( false ) )
{
//could not advance to the child item so there is no items to be removed...
throw new DataGridInternalException();
}
return this.HandleSameLevelGroupRemove( nodeHelper.CurrentNode, out countRemoved, out genCountRemoved, out removeIndex, e, removedContainers );
}
private void StartGenerator( GeneratorPosition startPos, GeneratorDirection direction )
{
if( this.Status == GeneratorStatus.GeneratingContainers )
{
throw new InvalidOperationException( "Cannot perform this operation while the generator is busy generating items" );
}
//set the GeneratorStatus to "Generating"
m_generatorStatus = GeneratorStatus.GeneratingContainers;
//Initialize the Direction
m_generatorDirection = direction;
//retrieve the Index for the GeneratorPosition retrieved
m_generatorCurrentGlobalIndex = this.IndexFromGeneratorPosition( startPos );
// case 117460: throw an exception if the GeneratorPosition is bad, but not if the itemcount is 0
//(and generator position maps to index 0 ).
int itemCount = this.ItemCount;
if( ( m_generatorCurrentGlobalIndex < 0 ) || ( ( itemCount > 0 ) && ( m_generatorCurrentGlobalIndex >= itemCount ) ) )
throw new ArgumentOutOfRangeException( "startPos", "The specified start position is outside the range of the Generator content." );
//case 117460: if the item count is 0, return without doing any check, GenerateNext will never process any content in that case.
//Since the GeneratorNodeHelper is never created.
if( itemCount == 0 )
return;
//and create a node helper that will assist us during the Generation process...
m_generatorNodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 ); // start index is always 0
//position the GeneratorNodeHelper to the appropriate node
if( !m_generatorNodeHelper.FindNodeForIndex( m_generatorCurrentGlobalIndex ) ) //find index?!?!
{
//there was a problem moving the Node helper...
throw new DataGridInternalException();
}
//Calculate the offset
m_generatorCurrentOffset = m_generatorCurrentGlobalIndex - m_generatorNodeHelper.Index;
ItemsGeneratorNode itemsNode = m_generatorNodeHelper.CurrentNode as ItemsGeneratorNode;
if( itemsNode != null )
{
m_generatorCurrentDetail = itemsNode.GetDetailNodeForIndex( m_generatorCurrentOffset, out m_generatorCurrentOffset, out m_generatorCurrentDetailIndex, out m_generatorCurrentDetailNodeIndex );
}
if( m_generatorCurrentDetail != null )
{
m_generatorCurrentDetailDisposable = ( ( IItemContainerGenerator )m_generatorCurrentDetail.DetailGenerator ).StartAt( m_generatorCurrentDetail.DetailGenerator.GeneratorPositionFromIndex( m_generatorCurrentDetailIndex ), direction, true );
}
}
private GeneratorPosition HandleSameLevelGroupRemove( GeneratorNode firstChild, out int countRemoved, out int genCountRemoved, out int removeIndex, NotifyCollectionChangedEventArgs e, IList<DependencyObject> removedContainers )
{
GeneratorPosition retval;
countRemoved = 0;
genCountRemoved = 0;
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( firstChild, 0, 0 );
nodeHelper.ReverseCalculateIndex();
//Advance to the first "Group" node (skip the GroupHEaders)
while( !( nodeHelper.CurrentNode is GroupGeneratorNode ) )
{
if( !nodeHelper.MoveToNext() )
throw new DataGridInternalException();
}
//then move up to the removal start point.
if( !nodeHelper.MoveToNextBy( e.OldStartingIndex ) )
{
throw new DataGridInternalException();
}
GroupGeneratorNode startNode = nodeHelper.CurrentNode as GroupGeneratorNode;
removeIndex = -1;
//Only fetch the index if the group itself is not "collapsed" or under a collapsed group already
if( ( startNode.IsExpanded == startNode.IsComputedExpanded ) && ( startNode.ItemCount > 0 ) )
{
removeIndex = nodeHelper.Index;
retval = this.GeneratorPositionFromIndex( removeIndex );
}
else
{
retval = new GeneratorPosition( -1, 1 );
}
//retrieve the generator position for the first item to remove.
this.ProcessGroupRemoval( startNode, e.OldItems.Count, true, out countRemoved );
//Clean the chain "isolated" previously
this.NodeFactory.CleanGeneratorNodeTree( startNode );
if( removeIndex != -1 )
{
//remove the appropriate
genCountRemoved = this.RemoveGeneratedItems( removeIndex, removeIndex + countRemoved - 1, removedContainers );
}
return retval;
}
private void HandleDetailReset( object masterItem, DetailGeneratorNode detailNode )
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
int masterIndex = nodeHelper.FindItem( masterItem );
// -1 means either taht the master item is below a collapsed group node, or that the item does not exists, validate.
if( masterIndex == -1 )
{
nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
if( !nodeHelper.Contains( masterItem ) )
throw new DataGridInternalException();
}
ItemsGeneratorNode masterNode = nodeHelper.CurrentNode as ItemsGeneratorNode;
Debug.Assert( masterNode != null, "masterNode != null" );
#if LOG
Log.Assert( this, masterNode != null, "masterNode != null" );
#endif
//start index will be ignored later on if the masterIndex is -1!!
int startIndex = nodeHelper.Index + masterNode.IndexOf( masterItem ) + 1; //details start a master index + 1
List<DetailGeneratorNode> detailsForMaster = null;
//edge case, it is possible to receive a Reset from Floating details!
if( masterNode.Details == null )
{
//check for floating details, if not present, throw, this is an abnormal case.
if( !m_floatingDetails.Contains( masterItem ) )
{
throw new DataGridInternalException();
}
}
else
{
masterNode.Details.TryGetValue( masterNode.Items.IndexOf( masterItem ), out detailsForMaster );
Debug.Assert( detailsForMaster != null, "detailsForMaster != null" );
#if LOG
Log.Assert( this, detailsForMaster != null, "detailsForMaster != null" );
#endif
}
if( detailsForMaster != null )
{
//this is required to ensure that if the details that resets is not the first one, the index is calculated appropriatly.
foreach( DetailGeneratorNode node in detailsForMaster )
{
if( node == detailNode )
{
break;
}
else
{
startIndex += node.ItemCount;
}
}
//if there were 'items' in the detail node, process the remove of them
int oldDetailCount = detailNode.ItemCount;
if( oldDetailCount > 0 )
{
int endIndex = startIndex + oldDetailCount - 1; //last detail index
GeneratorPosition removeGenPos = ( masterIndex != -1 )
? this.GeneratorPositionFromIndex( startIndex )
: new GeneratorPosition( -1, 1 );
int genRemCount = 0;
List<DependencyObject> removedContainers = new List<DependencyObject>();
//this has no uses if the masterIndex is -1 ( collapsed master item )
if( masterIndex != -1 )
{
genRemCount = this.RemoveGeneratedItems( startIndex, endIndex, removedContainers );
}
masterNode.AdjustItemCount( -oldDetailCount );
this.IncrementCurrentGenerationCount();
//this has no uses if the masterIndex is -1 ( collapsed master item )
if( masterIndex != -1 )
{
this.SendRemoveEvent( removeGenPos, masterIndex + 1, oldDetailCount, genRemCount, removedContainers );
}
}
detailNode.UpdateItemCount();
int newDetailCount = detailNode.ItemCount;
if( newDetailCount > 0 )
{
GeneratorPosition addGenPos = new GeneratorPosition( -1, 1 );
//this has no uses if the masterIndex is -1 ( collapsed master item )
if( masterIndex != -1 )
{
addGenPos = this.GeneratorPositionFromIndex( startIndex );
}
masterNode.AdjustItemCount( newDetailCount );
this.IncrementCurrentGenerationCount();
//this has no uses if the masterIndex is -1 ( collapsed master item )
if( masterIndex != -1 )
{
this.SendAddEvent( addGenPos, masterIndex + 1, newDetailCount );
}
}
}
}
private GroupGeneratorNode ProcessGroupRemoval(
GeneratorNode startNode,
int removeCount,
bool updateGroupNodeMappingCache,
out int countRemoved )
{
Debug.Assert( removeCount != 0, "remove count cannot be 0" );
#if LOG
Log.Assert( this, removeCount != 0, "remove count cannot be 0" );
#endif
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( startNode, 0, 0 );//index not important.
GroupGeneratorNode parentGroup = startNode.Parent as GroupGeneratorNode;
int i = 0;
countRemoved = 0;
do
{
GroupGeneratorNode group = nodeHelper.CurrentNode as GroupGeneratorNode;
if( updateGroupNodeMappingCache )
{
m_groupNodeMappingCache.Remove( group.CollectionViewGroup );
}
Debug.Assert( group != null, "node to be removed must be a GroupGeneratorNode" );
#if LOG
Log.Assert( this, group != null, "node to be removed must be a GroupGeneratorNode" );
#endif
//add the total number of child to the count of items removed.
countRemoved += group.ItemCount;
i++;
if( i < removeCount )
{
if( !nodeHelper.MoveToNext() )
{
//could not advance to the last item to be removed...
throw new DataGridInternalException();
}
}
}
while( i < removeCount );
//disconnect the node chain to be removed from the linked list.
GeneratorNode previous = startNode.Previous;
GeneratorNode next = nodeHelper.CurrentNode.Next;
if( next != null )
{
next.Previous = previous;
}
if( previous != null )
{
previous.Next = next;
}
//if the first node removed was the first child of its parent
if( ( parentGroup != null ) && ( parentGroup.Child == startNode ) )
{
//set the next in line after the chain to be removed as the first child
parentGroup.Child = next;
}
//break the link between the chain and its same-level siblings.
nodeHelper.CurrentNode.Next = null;
startNode.Previous = null;
//Here, I need a special handling case... If I remove the first group node, I need to set a new firstItem
if( startNode == m_firstItem )
{
if( next != m_firstFooter )
{
m_firstItem = next;
}
else
{
m_firstItem = null;
}
if( m_startNode == startNode )
{
m_startNode = next;
}
}
Debug.Assert( nodeHelper.CurrentNode is GroupGeneratorNode, "last node is not a GroupGeneratorNode" );
#if LOG
Log.Assert( this, nodeHelper.CurrentNode is GroupGeneratorNode, "last node is not a GroupGeneratorNode" );
#endif
return ( GroupGeneratorNode )nodeHelper.CurrentNode;
}
void IDataGridContextVisitable.AcceptVisitor( int minIndex, int maxIndex, IDataGridContextVisitor visitor, DataGridContextVisitorType visitorType, bool visitDetails, out bool visitWasStopped )
{
visitWasStopped = false;
if( m_startNode == null )
return;
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
nodeHelper.ProcessVisit( m_dataGridContext, minIndex, maxIndex, visitor, visitorType, visitDetails, out visitWasStopped );
}
public int IndexFromItem( object item )
{
int retval = -1;
if( item != null )
{
this.EnsureNodeTreeCreated();
if( m_startNode != null )
{
//if item is generated
int generatedIndex = this.FindFirstGeneratedIndexForLocalItem( item );
if( generatedIndex != -1 )
{
retval = m_genPosToIndex[ generatedIndex ];
}
//if the item is not generated
else
{
GeneratorNodeHelper nodeHelper = new GeneratorNodeHelper( m_startNode, 0, 0 );
//Note: Under that specific case, I do not want to search through collapsed group nodes... Effectivelly, an item "below" a collapsed group node
// Have no index as per the "item to index" interface of the generator.
retval = nodeHelper.FindItem( item );
}
}
}
return retval;
}
