TBaseVirtualTree.AdviseChangeEvent Method

Used to register a delayed change event.

procedure AdviseChangeEvent(StructureChange: Boolean; Node: PVirtualNode; Reason: TChangeReason); virtual;

Often there can be many change events in a row and calling the application for each of them might be too time costly. So they are by default accumulated until a certain time has elapsed (ChangeDelay) or, if BeginUpdate was called, until EndUpdate is executed. If StructureChange is False then we have a selection change event (without a specific reason) otherwise it is a structure change. 

There are two possibilities to avoid delayed change events. One is the permanent way by setting ChangeDelay to 0, the other one is to enter the synchronous mode by calling BeginSynch.

TBaseVirtualTree Class