TGIS_LayerVector.CursorBeforeFetchEvent event

Fired before a cursor fetches shapes from the data source.

# Python
@property
def CursorBeforeFetchEvent(
  self
) -> TGIS_CursorEvent: 
 
@CursorBeforeFetchEvent.setter
def CursorBeforeFetchEvent(
  self,
  _value: TGIS_CursorEvent
) -> None: 

PURPOSE: Provides a hook before the initial cursor fetch so callers can prepare related resources or validate state.

BEHAVIOR: Fires immediately before CursorFirst or FindFirst starts retrieving matching shapes.

CONSTRAINTS: Handler execution affects fetch startup and should complete quickly.