Usage

Add the Sain composable into your project and customize it according to your needs:

var imageBitmap: ImageBitmap? by remember {
    mutableStateOf(null)
}

val state = remember {
    SignatureState()
}

Sain(
    state = state,
    modifier = Modifier
        .fillMaxWidth()
        .height(250.dp)
        .border(
            BorderStroke(
                width = .5.dp,
                color = MaterialTheme.colorScheme.onSurface
            ),
            shape = RoundedCornerShape(8.dp)
        ),
    onComplete = { signatureBitmap ->
        if (signatureBitmap != null) {
            imageBitmap = signatureBitmap
        } else {
            println("Signature is empty")
        }
    },
) { action ->
    Row(
        modifier = Modifier
            .padding(top = 16.dp)
            .fillMaxWidth(),
        horizontalArrangement = Arrangement.spacedBy(16.dp)
    ) {
        Button(
            modifier = Modifier.weight(1f),
            onClick = {
                imageBitmap = null
                action(SignatureAction.CLEAR)
            }) {
            Text("Clear")
        }
        Button(
            modifier = Modifier.weight(1f),
            onClick = {
                action(SignatureAction.COMPLETE)
            }) {
            Text("Complete")
        }
    }
}

Actions

The Sain composable takes in an actions parameter which is a lambda that takes in a SignatureAction enum. The SignatureAction enum has two values: - CLEAR - Clears the signature - COMPLETE - Completes the signature and returns the signature as an ImageBitmap in the onComplete lambda

Customization

• signatureColor - The color of the signature
• signatureThickness - The thickness of the signature
• modifier - The modifier for the Sain composable which allows you to customize the size, shape, background, border etc of the signature view

Known Issues

The library works well in one orientation. If you rotate the device, the signature will be lost. This is a known issue and will be fixed in the next release.

Note: The library is now hosted on Maven Central. If you were using the previous version hosted on Jitpack, please update your dependencies to the latest version.