ZoomView.zoomstep

step

Configures the number zoom in and zoom out actions that are required to increase or decrease the resolution by a factor of two. The resolution change for each zoom action is 2^1 per step. Set to 0 to zoom to full resolution with a single zoom action.

limit

Specifies the maximum zoom resolution, relative to the full resolution image. The default is 1.0, which does not allow zooming beyond full resolution.