ZoomGestureDetector

class ZoomGestureDetector

import androidx.camera.viewfinder.core.ZoomGestureDetector
import androidx.camera.viewfinder.core.ZoomGestureDetector.ZoomEvent

val zoomGestureDetector =
    ZoomGestureDetector(context) { zoomEvent ->
        when (zoomEvent) {
            is ZoomEvent.Move -> {
                val zoomState = camera.cameraInfo.zoomState.value!!
                val ratio = zoomState.zoomRatio * zoomEvent.incrementalScaleFactor
                val minRatio = zoomState.minZoomRatio
                val maxRatio = zoomState.maxZoomRatio
                val clampedRatio = min(max(ratio, minRatio), maxRatio)
                camera.cameraControl.setZoomRatio(clampedRatio)
            }
            is ZoomEvent.Begin -> {
                // Handle the begin event. For example, determine whether this gesture
                // should be processed further.
            }
            is ZoomEvent.End -> {
                // Handle the end event. For example, show a UI indicator.
            }
        }
        true
    }

return zoomGestureDetector.onTouchEvent(event)