setZoom method

void setZoom(
  1. ZoomMode mode, {
  2. double factor = 1.0,
})

Sets the zoom mode and optional custom scale factor.

factor is only meaningful when mode is ZoomMode.custom; it is ignored otherwise. factor must be positive. Notifies listeners.

Implementation

void setZoom(ZoomMode mode, {double factor = 1.0}) {
  assert(factor > 0, 'zoomFactor must be positive, got $factor');
  final newFactor = mode == ZoomMode.custom ? factor : _zoomFactor;
  if (_zoomMode == mode && newFactor == _zoomFactor) return;
  _zoomMode = mode;
  _zoomFactor = newFactor;
  notifyListeners();
}