TCustomTreeView.OnChanging property
Event handler signalled before the selected node in the tree view control is changed.
Declaration
property OnChanging: TTVChangingEvent read FOnChanging write FOnChanging;Description
OnChanging is a
TTVChangingEvent property with the
event handler signalled prior to changing the selected node on the tree view
control. It allows an application to determine whether the new tree node can
become the selected node for the control.
Node is the tree node to examine in the handler routine.
Set the AllowChange argument to True to allow the tree node to be the selected node on the control.
OnChanging is signalled from the CanChange method, and occurs when a new value is assigned to the Selection property.
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.