public bool InsertAfter(GeneratorNode insert)
{
if (insert == null)
{
throw new DataGridInternalException("GeneratorNode is null.");
}
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("Unable to move to the requested generator index.");
}
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);
}
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 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 = System.Math.Abs(nodeHelper.Index);
m_sourceDataIndex = System.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);
}
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);
}
public bool InsertBefore(GeneratorNode insert)
{
if (insert == null)
{
throw new DataGridInternalException("GeneratorNode is null");
}
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);
}
public void ProcessVisit(
DataGridContext sourceContext,
int minIndex,
int maxIndex,
IDataGridContextVisitor visitor,
DataGridContextVisitorType visitorType,
bool visitDetails,
out bool visitWasStopped)
{
visitWasStopped = false;
// This is used only for DataGridContextVisitorType.ItemsBlock
int startSourceDataItemIndex = -1;
int endSourceDataItemIndex = -1;
if (minIndex < 0)
{
DataGridException.ThrowSystemException("The minimum index must be greater than or equal to zero.",
typeof(ArgumentException), sourceContext.DataGridControl.Name, "minIndex");
}
if ((visitorType & DataGridContextVisitorType.DataGridContext) == DataGridContextVisitorType.DataGridContext)
{
visitor.Visit(sourceContext, ref visitWasStopped);
if (visitWasStopped)
{
return;
}
}
//Take a shortcut, if the visit is made only for contexts, and there is no child contexts
//return right away.
bool containsDetails = false;
foreach (DataGridContext childContext in sourceContext.GetChildContexts())
{
containsDetails = true;
break;
}
bool processed = false;
do
{
//resets the flag that indicates if the node was already processed
processed = false;
int itemCount = this.CurrentNode.ItemCount;
//If the whole current node is below the minIndex, jump over it.
if ((this.Index + (itemCount - 1)) < minIndex)
{
processed = true;
}
//when the index to visit eNequeos the range defined, exit the loop.
if (this.Index > maxIndex)
{
break;
}
int minForNode = System.Math.Max(0, minIndex - this.Index); // this will give the base offset within the node where to start the visitating!
int maxForNode = System.Math.Min(itemCount - 1, maxIndex - this.Index); //this will five the max offset within this node to visit (protected against overlfow )
if (!processed)
{
HeadersFootersGeneratorNode headersNode = this.CurrentNode as HeadersFootersGeneratorNode;
if (headersNode != null)
{
bool isHeaderFooter = (headersNode.Parent == null);
//If the node is a Headers or Footers node AND the visitorType does not contain HeadersFooters
if ((isHeaderFooter) && ((visitorType & DataGridContextVisitorType.HeadersFooters) == DataGridContextVisitorType.HeadersFooters))
{
GeneratorNodeHelper.ProcessHeadersNodeVisit(headersNode, sourceContext, minForNode, maxForNode, visitor, ref visitWasStopped);
}
else if ((!isHeaderFooter) && ((visitorType & DataGridContextVisitorType.GroupHeadersFooters) == DataGridContextVisitorType.GroupHeadersFooters))
{
GeneratorNodeHelper.ProcessHeadersNodeVisit(headersNode, sourceContext, minForNode, maxForNode, visitor, ref visitWasStopped);
}
processed = true;
}
}
if (!processed)
{
ItemsGeneratorNode itemsNode = this.CurrentNode as ItemsGeneratorNode;
if (itemsNode != null)
{
if ((visitorType & DataGridContextVisitorType.ItemsBlock) == DataGridContextVisitorType.ItemsBlock)
{
GeneratorNodeHelper.ProcessItemsNodeBlockVisit(
itemsNode, sourceContext,
minForNode, maxForNode,
visitor, visitorType, visitDetails, containsDetails, m_sourceDataIndex,
ref startSourceDataItemIndex, ref endSourceDataItemIndex, ref visitWasStopped);
}
else if (((visitDetails) && (containsDetails)) ||
((visitorType & DataGridContextVisitorType.Items) == DataGridContextVisitorType.Items))
{
GeneratorNodeHelper.ProcessItemsNodeVisit(
itemsNode, sourceContext,
minForNode, maxForNode,
visitor, visitorType, visitDetails, m_sourceDataIndex, ref visitWasStopped);
}
processed = true;
}
}
if (!processed)
{
GroupGeneratorNode groupNode = this.CurrentNode as GroupGeneratorNode;
if (groupNode != null)
{
if ((visitorType & DataGridContextVisitorType.Groups) == DataGridContextVisitorType.Groups)
{
visitor.Visit(
sourceContext,
groupNode.CollectionViewGroup,
groupNode.NamesTree,
groupNode.Level,
groupNode.IsExpanded,
groupNode.IsComputedExpanded,
ref visitWasStopped);
}
processed = true;
}
}
if (!processed)
{
throw new DataGridInternalException("Unable to process the visit.", sourceContext.DataGridControl);
}
if (visitWasStopped)
{
break;
}
if (this.MoveToChild())
{
continue;
}
if (this.MoveToFollowing())
{
continue;
}
break;
}while(true); //loop is controled by continue and break statements.
if ((visitorType & DataGridContextVisitorType.ItemsBlock) == DataGridContextVisitorType.ItemsBlock)
{
if (startSourceDataItemIndex != -1)
{
bool stopVisit = false;
visitor.Visit(sourceContext, startSourceDataItemIndex, endSourceDataItemIndex, ref stopVisit);
visitWasStopped = visitWasStopped || stopVisit;
}
}
}