TLVDataHintEvent procedure type
Specifies a handler routine for data hint events in TListView.
Declaration
TLVDataHintEvent = procedure(Sender: TObject; StartIndex: Integer;
EndIndex: Integer) of objectArguments
Sender | Object (TCustomListView) for the event notification. |
StartIndex | Initial position for visible list items on the list view control. |
EndIndex | Final position for visible list items on the list view control. |
Description
TLVDataHintEvent is an object procedure type which specifies a
handler routine for data hints in TListView controls. TLVDataHintEvent is the
type used for the OnDataHint event handler in TCustomListView and descendent
classes.
An application can implement and assign a handler routine to perform actions needed to pre-load or cache values from an external source. It is used when virtual mode is enabled in the list view control.
The arguments passed to the handler routine identify the list view control for the event, and the range of list item positions currently visible on the list view control.
TLVDataHintEvent and OnDataHint events are used on the Windows platform only. Other widgetsets do not implement the data hinting mechanism.
See also
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.