[Overview][Constants][Types][Classes][Procedures and functions][Index] Reference for unit 'ComCtrls' (#lcl)

TTVChangingEvent

Specifies an event handler signalled when a tree node is about to be changed.

Declaration

Source position: comctrls.pp line 2908

type TTVChangingEvent = procedure(

  Sender: TObject;

  Node: TTreeNode;

  var AllowChange: Boolean

) of object;

Arguments

Sender

  

Object for the event notification.

Description

TTVChangingEvent is an object procedure type which specifies an event handler signalled when a tree node is about to be changed. TTVChangingEvent is the type used to implement the TCustomTreeView.OnChanging property.

See also

TCustomTreeView.OnChanging

  

Event handler signalled before the selected node in the tree view control is changed.

TTVChangedEvent

  

Specifies an event handler signalled when a tree node has been changed.

Version 3.2 Generated 2024-02-25 Home