public void /* ITreeGridDesignerColumnHost */ Invalidate(object tracking)
{
if (!_containerControl.WatermarkVisible)
{
if (tracking == null)
{
_treeControl.Invalidate();
}
else if (TreeProvider.VisibleItemCount > 0)
{
if (TreeGridDesignerBranch.InVirtualTreeEdit)
{
// a common case here is that an event handler calls this due to an edit made in the tree itself,
// so we look for that and don't refresh if that is the case, as it is unnecessary.
var itemInfo = _treeControl.SelectedItemInfo;
if (itemInfo.Branch != null)
{
var options = 0;
var currentTracking = itemInfo.Branch.GetObject(
itemInfo.Row, itemInfo.Column, ObjectStyle.TrackingObject, ref options);
if (tracking.Equals(currentTracking))
{
return;
}
}
}
// search visible rows only
var startIndex = _treeControl.TopIndex;
var itemHeight = (int)NativeMethods.SendMessage(_treeControl.Handle, NativeMethods.LB_GETITEMHEIGHT, 0, 0);
var endIndex = TreeProvider.VisibleItemCount;
var endVisibleIndex = startIndex + 1 + ((_treeControl.Height > 0) ? (_treeControl.Height / itemHeight) : 0);
if (endVisibleIndex < endIndex)
{
endIndex = endVisibleIndex;
}
var itemEnumerator = TreeProvider.EnumerateColumnItems(0, _treeControl.ColumnPermutation, false, startIndex, endIndex);
IBranch currentBranch = null;
while (itemEnumerator.MoveNext())
{
// just make a single call into each branch to locate the object
if (itemEnumerator.Branch != null &&
itemEnumerator.Branch != currentBranch)
{
currentBranch = itemEnumerator.Branch;
var locateData = currentBranch.LocateObject(tracking, ObjectStyle.TrackingObject, 0);
if (locateData.Options == (int)TrackingObjectAction.ThisLevel)
{
// found it
_treeControl.InvalidateItem((itemEnumerator.RowInTree - itemEnumerator.RowInBranch) + locateData.Row);
break;
}
}
}
}
}
}
