onZooming method

void onZooming(MapZoomDetails details)

Called whenever zooming is happening.

Subclasses can override this method to do any custom operations based on the details provided in the MapZoomDetails. When super.onZooming(details) is not called, zooming will not happen.

MapZoomDetails contains following properties.

• MapZoomDetails.previousVisibleBounds - provides the visible bounds before the current zooming operation completes i.e. current visible bounds.
• MapZoomDetails.newVisibleBounds - provides the new visible bounds when the current zoom completes. Hence, if the super.onZooming(details) is not called, there will be no changes in the UI.
• MapZoomDetails.previousZoomLevel - provides the zoom level before the current zooming operation completes i.e. current zoom level.
• MapZoomDetails.newZoomLevel - provides the new zoom level when the current zoom completes. Hence, if the super.onZooming(details) is not called, there will be no changes in the UI.
• MapZoomDetails.globalFocalPoint - The global focal point of the pointers in contact with the screen.
• MapZoomDetails.localFocalPoint - The local focal point of the pointers in contact with the screen.

Implementation

void onZooming(MapZoomDetails details) {
  if (_controller != null) {
    _latLngBounds = details.newVisibleBounds;
    if (_controller!.layerType == LayerType.shape) {
      _controller!.notifyZoomingListeners(details);
      _controller!.notifyListeners();
    } else {
      _controller!
        ..isInInteractive = true
        ..gesture = Gesture.scale;
      zoomLevel = details.newZoomLevel!;
      focalLatLng = details.focalLatLng;
      _controller!.notifyListeners();
    }
  }
}