/// <summary>
/// Each node in the tree can have an associated tracking object used to indentify it.
/// The branch can override this method to return the row index corresponding to the given
/// object.
/// </summary>
/// <param name="locateData">
/// If the object is a direct child of this branch, set locateData.Options = TrackingObjectAction.ThisLevel.
/// If the object is deeper in the tree, the branch should set it to TrackingObjectAction.NextLevel,
/// locateData.Row should be set to the row where the search should continue.
/// </param>
/// <param name="tracked">Object to track</param>
protected virtual LocateObjectData LocateTrackingObject(object tracked, LocateObjectData locateData)
{
// base implementation handles searching in this branch, but searching
// deeper in the tree requires knowledge not available
// in the base class.
locateData.Row = -1;
locateData.Row = GetIndexForElement(tracked);
locateData.Options = locateData.Row >= 0 ? (int)TrackingObjectAction.ThisLevel : (int)TrackingObjectAction.NotTracked;
return locateData;
}
/// <summary>
/// IBranch interface implementation.
/// </summary>
public LocateObjectData /* IBranch */ LocateObject(object obj, ObjectStyle style, int locateOptions)
{
var locateData = new LocateObjectData(-1, 0, 0);
switch (style)
{
case ObjectStyle.ExpandedBranch:
case ObjectStyle.SubItemExpansion:
locateData.Options = (int)BranchLocationAction.DiscardBranch;
break;
case ObjectStyle.TrackingObject:
locateData = LocateTrackingObject(obj, locateData);
break;
}
return locateData;
}
LocateObjectData IBranch.LocateObject(object obj, ObjectStyle style, int locateOptions)
{
var locateData = new LocateObjectData();
locateData.Row = -1;
foreach (IBranch branch in _branchList)
{
locateData = branch.LocateObject(obj, style, locateOptions);
if (locateData.Row != -1)
{
return locateData;
}
}
return locateData;
}
