Jetpack Compose Button with gradient background?

Question

Is it possible to create Button with gradient background?

@Composable
fun GradientButtonExample() {

    val horizontalGradientBrush = Brush.horizontalGradient(
        colors = listOf(
            Color(0xffF57F17),
            Color(0xffFFEE58),
            Color(0xffFFF9C4)
        )
    )


    val verticalGradientBrush = Brush.verticalGradient(
        colors = listOf(
            Color(0xff4E342E),
            Color(0xff8D6E63),
            Color(0xffD7CCC8)
        )
    )

    Button(onClick = {}) {
        Text(
            text = "Horizontal Gradient",
            modifier = Modifier
                .background(brush = horizontalGradientBrush)
        )
    }

    Button(onClick = {}) {
        Text(
            text = "Vertical Gradient",
            modifier = Modifier
                .background(brush = verticalGradientBrush)
        )
    }
}

Adding gradient to Text with background(brush) leaves a margin between Button and Text. When i set background of button with modifier.background(brush = horizontalGradientBrush), Button is drawn with primary color, basically nothing happens. Is it possible to set background of Button, not other components, with gradient colors?

Answer 1

Compose 1.0.0-alpha10

You could do someething like this:

@Composable
fun GradientButton(
    text: String,
    gradient : Brush,
    modifier: Modifier = Modifier,
    onClick: () -> Unit = { },
) {
    Button(
        modifier = modifier,
        colors = ButtonDefaults.buttonColors(backgroundColor = Color.Transparent),
        contentPadding = PaddingValues(),
        onClick = { onClick() },
    ) {
        Box(
            modifier = Modifier
                .background(gradient)
                .then(modifier),
            contentAlignment = Alignment.Center,
        ) {
            Text(text = text)
        }
    }
}

Usage sample:

@Composable
private fun Content() {

val gradient =
    Brush.horizontalGradient(listOf(Color(0xFF28D8A3), Color(0xFF00BEB2)))

    Column {
        GradientButton(
            text = "Gradient Button - Max Width",
            gradient = gradient,
            modifier = Modifier
                .fillMaxWidth()
                .padding(horizontal = 16.dp, vertical = 8.dp)
        )
        GradientButton(
            text = "Gradient Button - Wrap Width",
            gradient = gradient,
            modifier = Modifier
                .wrapContentWidth()
                .padding(horizontal = 16.dp, vertical = 8.dp)
        )
    }
}

Result sample:

Answer 2

Actually, you don't need the button... You can achieve this result using a simple Text...

Text(
    text = "Click Me",
    style = TextStyle(color = Color.White),
    modifier = Modifier
        .clickable(onClick = {})
        .background(
            Brush.verticalGradient(
                colors = listOf(
                    Color.Blue,
                    Color.Green
                )
            ),
            shape = RoundedCornerShape(4.dp)
        )
        .padding(horizontal = 16.dp, vertical = 8.dp),
)