Used in the TCustomTreeView.OnChanging event.
TTVChangingEvent = procedure (Sender: TObject; Node: TTreeNode; var AllowChange: Boolean) of object;
(Sender: TObject; Node: TTreeNode; var AllowChange: Boolean) ( TTVChangingEvent)();
ComCtrls
This event is used in the TCustomTreeView.OnChanging event when the selection is about to change from one node to another.
The Sender parameter is the tree view whose selected node changes, and the Node parameter specifies the node that is about to be selected. AllowChange indicates whether the node can be selected or not.
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