Unit, onDrag: (dragAmount: Offset) -> Unit, onZoom: (zoom: Float) -> Unit, ) { forEachGesture { awaitPointerEventScope { awaitFirstDown(requireUnconsumed = false) val gestureType = detectGesture() ?: return@awaitPointerEventScope onGestureStart(gestureType) do { val event = awaitPointerEvent() when (gestureType) { GestureType.DRAG -> { val dragChange = event.calculatePan() if (dragChange != Offset.Zero) onDrag(dragChange) } GestureType.ZOOM -> { val zoomChange = event.calculateZoom() if (zoomChange != 1f) onZoom(zoomChange) } } event.changes.fastForEach { if (it.positionChanged()) it.consume() } } while (event.changes.fastAny { it.pressed }) onGestureEnd(gestureType) } } } private suspend fun AwaitPointerEventScope.detectGesture(): GestureType? { var zoom = 1f var pan = Offset.Zero val touchSlop = viewConfiguration.touchSlop var gestureType: GestureType? = null do { val event = awaitPointerEvent() zoom *= event.calculateZoom() pan += event.calculatePan() val zoomMotion = abs(1 - zoom) * event.calculateCentroidSize(useCurrent = false) val panMotion = pan.getDistance() if (zoomMotion > touchSlop) { gestureType = GestureType.ZOOM break } if (panMotion > touchSlop) { gestureType = GestureType.DRAG break } } while (event.changes.fastAny { it.pressed }) return gestureType } enum class GestureType { DRAG, ZOOM } ΞϓϦͷཁ݅Λຬͨͤͳ͍ͷͰdetectؔΛࣗͰॻ͍ͨ ※Ջͳͱ͖ʹݟͯͶ https://bit.ly/composegesture