Multitouch: Panning, zooming, rotating
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To detect multitouch gestures used for panning, zooming and rotating, you can
use the transformable
modifier. This modifier does not transform elements by
itself, it only detects the gestures.
@Composable
private fun TransformableSample() {
// set up all transformation states
var scale by remember { mutableStateOf(1f) }
var rotation by remember { mutableStateOf(0f) }
var offset by remember { mutableStateOf(Offset.Zero) }
val state = rememberTransformableState { zoomChange, offsetChange, rotationChange ->
scale *= zoomChange
rotation += rotationChange
offset += offsetChange
}
Box(
Modifier
// apply other transformations like rotation and zoom
// on the pizza slice emoji
.graphicsLayer(
scaleX = scale,
scaleY = scale,
rotationZ = rotation,
translationX = offset.x,
translationY = offset.y
)
// add transformable to listen to multitouch transformation events
// after offset
.transformable(state = state)
.background(Color.Blue)
.fillMaxSize()
)
}
If you need to combine zooming, panning and rotation with other gestures, you
can use the
PointerInputScope.detectTransformGestures
detector.
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Last updated 2024-08-21 UTC.
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