[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 2889

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

  

OnChanging - specialized event handler while TreeView is being changed.

TTVChangedEvent

  

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

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