onWillZoom property

WillZoomCallback? onWillZoom

Called whenever zooming is happening.

If it returns false, 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 it returns false, 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 it returns false, 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

final WillZoomCallback? onWillZoom;