public override bool MoveToPreviousFlatNode()
{
if (this.node == null)
{
return(false);
}
TreeGridNode nextNode = this.node;
if (this.node.childIndex == 0)
{
// We're at the top of this list of children. Pop up to the parent if we have one.
if (this.node.Parent is RootTreeGridNode)
{
return(false);
}
nextNode = this.node.Parent;
}
else
{
nextNode = this.node.Parent.GetOrCreateChildNode(this.node.childIndex - 1);
nextNode = FindLastNode(nextNode);
}
nextNode.AddExternalReference();
this.node.ReleaseExternalReference();
this.node = nextNode;
return(true);
}
public override bool MoveToNextFlatNode()
{
if (this.node == null)
{
return(false);
}
TreeGridNode nextNode = this.node;
if (nextNode.IsExpanded && nextNode.items.Count > 0)
{
// We're on a node that is expanded. Move to its first child.
nextNode = nextNode.GetOrCreateChildNode(0);
}
else
{
while (nextNode.Parent == null || nextNode.childIndex == nextNode.Parent.items.Count - 1)
{
// Reached the end of this node. Pop up a level. If we're already at the top, we're done.
if (nextNode.Parent == null)
{
return(false);
}
nextNode = nextNode.Parent;
}
nextNode = nextNode.Parent.GetOrCreateChildNode(nextNode.childIndex + 1);
}
nextNode.AddExternalReference();
this.node.ReleaseExternalReference();
this.node = nextNode;
return(true);
}
public override bool MoveToFirstCollapsePoint()
{
if (this.node == null)
{
return(false);
}
TreeGridNode collapsePoint = FindFirstCollapsePoint(this.node);
if (collapsePoint == this.node || collapsePoint == null)
{
// Didn't move
return(false);
}
collapsePoint.AddExternalReference();
this.node.ReleaseExternalReference();
this.node = collapsePoint;
return(true);
}
public override bool MoveToParentNode()
{
if (this.node == null)
{
return(false);
}
TreeGridNode parentNode = this.node.Parent;
// Can't move up to root node...
if (parentNode is ChildTreeGridNode)
{
parentNode.AddExternalReference();
this.node.ReleaseExternalReference();
this.node = parentNode;
return(true);
}
return(false);
}
