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Color.kt
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Color.kt
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package com.example.ripplematerial2
import androidx.annotation.FloatRange
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.*
import androidx.compose.material.LocalContentColor
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Text
import androidx.compose.material.ripple.LocalRippleTheme
import androidx.compose.runtime.Composable
import androidx.compose.runtime.CompositionLocalProvider
import androidx.compose.runtime.Stable
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
@Stable
fun getOverlayColor(
defaultColor: Color,
pressedColor: Color,
@FloatRange(from = 0.0, to = 0.5) overlayAlpha: Float
): Color {
check(defaultColor.alpha == 1f) {
"defaultColor alpha should be equal to 1.0"
}
check(pressedColor.alpha == 1f) {
"pressedColor alpha should be equal to 1.0"
}
val defaultRed = defaultColor.red * 255
val defaultGreen = defaultColor.green * 255
val defaultBlue = defaultColor.blue * 255
val pressedRed = pressedColor.red * 255
val pressedGreen = pressedColor.green * 255
val pressedBlue = pressedColor.blue * 255
val overlayRed = getColorComponent(defaultRed, pressedRed, overlayAlpha)
val overlayGreen = getColorComponent(defaultGreen, pressedGreen, overlayAlpha)
val overlayBlue = getColorComponent(defaultBlue, pressedBlue, overlayAlpha)
return Color(
red = overlayRed,
green = overlayGreen,
blue = overlayBlue
)
}
private fun getColorComponent(
defaultComponent: Float,
pressedComponent: Float,
@FloatRange(from = 0.0, to = 0.5) overlayAlpha: Float
): Int {
return coerce(defaultComponent + (pressedComponent - defaultComponent) / overlayAlpha).toInt()
}
private fun coerce(rawColorComponent: Float): Float {
return rawColorComponent
.coerceAtLeast(0f)
.coerceAtMost(255f)
}
@Preview
@Composable
private fun Preview1() {
TestCase(
defaultColor = Color(217, 217, 217),
pressedColor = Color(174, 174, 174)
)
}
@Preview
@Composable
private fun Preview2() {
TestCase(
defaultColor = Color(67, 110, 222),
pressedColor = Color(125, 159, 248)
)
}
@Preview
@Composable
private fun Preview3() {
TestCase(
defaultColor = Color(67, 110, 222),
pressedColor = Color(42, 81, 183)
)
}
@Preview
@Composable
private fun Preview4() {
TestCase(
defaultColor = Color(67, 110, 222),
pressedColor = Color(42, 150, 50)
)
}
@Preview
@Composable
private fun Preview5() {
TestCase(
defaultColor = Color(255, 0, 0),
pressedColor = Color(0, 255, 0)
)
}
@Composable
private fun TestCase(defaultColor: Color, pressedColor: Color) {
val alphaList = remember {
listOf(0.2f, 0.35f, 0.5f)
}
MaterialTheme {
Column(modifier = Modifier.fillMaxWidth()) {
TestBlock(
modifier = Modifier.fillMaxWidth(),
backgroundColor = defaultColor,
text = "default"
)
Row(
modifier = Modifier.fillMaxWidth()
) {
alphaList.forEach { alpha ->
val overlayColor = getOverlayColor(
defaultColor = defaultColor,
pressedColor = pressedColor,
overlayAlpha = alpha
)
CompositionLocalProvider(
LocalRippleTheme provides TestRippleTheme,
LocalContentColor provides overlayColor,
LocalRippleAlpha provides alpha
) {
TestBlock(
modifier = Modifier
.weight(1f)
.clickable { },
backgroundColor = defaultColor,
text = "alpha=$alpha"
)
}
}
}
TestBlock(
modifier = Modifier.fillMaxWidth(),
backgroundColor = pressedColor,
text = "pressed"
)
}
}
}
@Composable
private fun TestBlock(
modifier: Modifier,
backgroundColor: Color,
text: String
) {
Column(
modifier = modifier
.height(100.dp)
.background(backgroundColor),
verticalArrangement = Arrangement.spacedBy(10.dp, Alignment.CenterVertically),
horizontalAlignment = Alignment.CenterHorizontally
) {
Text(
text = text,
color = Color.Black
)
Text(
text = text,
color = Color.White
)
}
}