TBaseVirtualTree.FullyVisible Property

Read or set whether a node is fully visible or not.

property FullyVisible [Node: PVirtualNode]: Boolean;

Beside the fact that a node can be out of the client area there are two possibilities for it to be hidden. One is the vsVisible state in TVirtualNodeState, which hides the node regardles of the current state of another node, if not specified. The other one is that one or more parent nodes might be collapsed, hiding so their entire child nodes structure. The visibility flag itself can be checked using the IsVisible property, while the expansion state of parents nodes can be examined via the VisiblePath property. If both are true then the node is said to be fully visible. 

IsVisible, VisiblePath, vsVisible, TVirtualNodeStates

TBaseVirtualTree Class