public BranchModificationDisplayData(BranchModificationAction action, ref DisplayDataChangedData changeData)
{
Action = action;
Changes = changeData.Changes;
Branch = changeData.Branch;
Index = changeData.StartRow;
Column = changeData.Column;
Count = changeData.Count;
Flag = false;
}
/// <summary>
/// The displayed data for the branch has changed, and
/// any views on this tree need to be notified.
/// </summary>
/// <param name="changeData">The DisplayDataChangedData structure</param>
/// <returns>An events args object for IBranch.OnBranchModification</returns>
public static BranchModificationEventArgs DisplayDataChanged(DisplayDataChangedData changeData)
{
return new BranchModificationDisplayData(BranchModificationAction.DisplayDataChanged, ref changeData);
}
public BranchModificationDisplayData(BranchModificationAction action, ref DisplayDataChangedData changeData)
{
Action = action;
Changes = changeData.Changes;
Branch = changeData.Branch;
Index = changeData.StartRow;
Column = changeData.Column;
Count = changeData.Count;
Flag = false;
}
/// <summary>
/// The displayed data for the branch has changed, and
/// any views on this tree need to be notified.
/// </summary>
/// <param name="changeData">The DisplayDataChangedData structure</param>
/// <returns>An events args object for IBranch.OnBranchModification</returns>
public static BranchModificationEventArgs DisplayDataChanged(DisplayDataChangedData changeData)
{
return(new BranchModificationDisplayData(BranchModificationAction.DisplayDataChanged, ref changeData));
}
void ITree.DisplayDataChanged(DisplayDataChangedData changeData)
{
(myParent as ITree).DisplayDataChanged(changeData);
}
/// <summary>
/// The displayed data for the branch has changed, and
/// any views on this tree need to be notified.
/// </summary>
/// <param name="changeData">The DisplayDataChangedData structure</param>
protected void DisplayDataChanged(DisplayDataChangedData changeData)
{
var branch = changeData.Branch;
var column = changeData.Column;
var changes = changeData.Changes;
if (column >= ColumnCount)
{
return;
}
var fireNormalEvent = OnDisplayDataChanged != null;
var fireSingleColumnEvent = column == 0 && GetStateFlag(TreeStateFlags.FireSingleColumnOnDisplayDataChanged);
if (!(fireNormalEvent || fireSingleColumnEvent))
{
return;
}
ITree singleTree = null;
SingleColumnView singleView = null;
if (fireSingleColumnEvent)
{
singleTree = SingleColumnTree;
singleView = singleTree as SingleColumnView;
}
var tn = LocateTrackedNode(branch);
Debug.Assert(tn != null); //Expect LocateTrackedNode to throw otherwise
var coordinate = new VirtualTreeCoordinate();
int prevAbsIndex;
int prevAbsIndexSingleColumn;
int reportCount;
int reportCountSingleColumn;
int count;
int startRow;
int singleColumnSubItemAdjust;
//UNDONE: Does firing the event after we get the next node adversely affect the
//performance of the node tracking algorithm.
while (tn != null)
{
prevAbsIndex = prevAbsIndexSingleColumn = -2; // Set to -2 so that first diff check is never 1
reportCount = reportCountSingleColumn = 0;
if (changeData.StartRow == -1)
{
startRow = 0;
count = tn.ImmedCount;
}
else
{
startRow = changeData.StartRow;
count = changeData.Count;
}
while (count > 0)
{
coordinate = FindAbsoluteIndex(tn, startRow, out singleColumnSubItemAdjust);
if (coordinate.IsValid)
{
if (fireNormalEvent)
{
if (((coordinate.Row - prevAbsIndex) == 1)
|| (reportCount == 0))
{
++reportCount; //Wait to fire the event until we find something discontiguous
}
else
{
OnDisplayDataChanged(
this,
new DisplayDataChangedEventArgs(
this, changes, prevAbsIndex - reportCount + 1, coordinate.Column + column, reportCount));
reportCount = 1;
}
prevAbsIndex = coordinate.Row;
}
if (fireSingleColumnEvent && coordinate.Column == 0)
{
if (((coordinate.Row - singleColumnSubItemAdjust - prevAbsIndexSingleColumn) == 1)
|| (reportCountSingleColumn == 0))
{
++reportCountSingleColumn; //Wait to fire the event until we find something discontiguous
}
else
{
singleView.myOnDisplayDataChanged(
singleTree,
new DisplayDataChangedEventArgs(
singleTree, changes, prevAbsIndexSingleColumn - reportCountSingleColumn + 1, 0,
reportCountSingleColumn));
reportCountSingleColumn = 1;
}
prevAbsIndexSingleColumn = coordinate.Row - singleColumnSubItemAdjust;
}
++startRow;
--count;
}
else
{
break;
}
}
if (reportCount != 0)
{
OnDisplayDataChanged(
this,
new DisplayDataChangedEventArgs(
this, changes, prevAbsIndex - reportCount + 1, coordinate.Column + column, reportCount));
}
if (reportCountSingleColumn != 0)
{
singleView.myOnDisplayDataChanged(
singleTree,
new DisplayDataChangedEventArgs(
singleTree, changes, prevAbsIndexSingleColumn - reportCountSingleColumn + 1, 0, reportCountSingleColumn));
}
tn = tn.NextNode;
}
}
void ITree.DisplayDataChanged(DisplayDataChangedData changeData)
{
DisplayDataChanged(changeData);
}
