RAD Studio VCL Reference
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ComCtrls.TTVExpandingEvent Type
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Used in the TCustomTreeView.OnExpanding event.

Pascal
TTVExpandingEvent = procedure (Sender: TObject; Node: TTreeNode; var AllowExpansion: Boolean) of object;
C++
(Sender: TObject; Node: TTreeNode; var AllowExpansion: Boolean) ( TTVExpandingEvent)();
File

ComCtrls

Description

This event is used in the TCustomTreeView.OnExpanding event when a node is about to be expanded. 

Sender is the tree-view control in which a node is about to be expanded.  

Node is the node about to be expanded. 

AllowExpansion indicates whether the node can be expanded. 

 

See Also
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