Zoom

Zoom support

Zoom can be initialized and managed as state within Compose. The following example demonstrates how to set up and control zoom using CameraController:

val cameraSession = rememberCameraSession()
val zoomRatio by cameraSession.state.zoomRatio.collectAsStateWithLifecycle()
val cameraInfoState by cameraSession.info.collectStateWithLifecycle()
val minZoom = cameraInfoState.minZoom
val maxZoom = cameraInfoState.maxZoom

CameraPreview(
    cameraSession = cameraSession,
    isPinchToZoomEnabled = true // Default is already true
) {

    Button(
        onClick = { 
            val zoom = (zoomRatio + 1F).coerceIn(minZoom, maxZoom)
            cameraSession.controller.setZoomRatio(zoom)
        }
    ) {
        Text("Zoom ratio: $zoomRatio")
    }
}

Note: The isPinchToZoomEnabled property is enabled by default. Pinch gestures automatically update the zoom ratio through the camera controller.

Camera Zoom Properties

The cameraSession object exposes several properties that may be useful when implementing zoom functionality:

cameraSession.info.state.value.minZoom – Returns the minimum zoom level for the current CamSelector.

cameraSession.info.state.value.maxZoom – Returns the maximum zoom level for the current CamSelector.

cameraSession.info.state.value.isZoomSupported – Returns true if zoom is supported by the current CamSelector, false otherwise.