[英]Jetpack Compose inner shadow
如何使用 Jetpack Compose 創建內部陰影? 漸變應該從外面的黑色到里面的透明。 Modifier.shadow()
僅用於外部陰影。 使用負海拔是行不通的。
fun Modifier.innerShadow(
color: Color = Color.Black,
cornersRadius: Dp = 0.dp,
spread: Dp = 0.dp,
blur: Dp = 0.dp,
offsetY: Dp = 0.dp,
offsetX: Dp = 0.dp
) = drawWithContent {
drawContent()
val rect = Rect(Offset.Zero, size)
val paint = Paint()
drawIntoCanvas {
paint.color = color
paint.isAntiAlias = true
it.saveLayer(rect, paint)
it.drawRoundRect(
left = rect.left,
top = rect.top,
right = rect.right,
bottom = rect.bottom,
cornersRadius.toPx(),
cornersRadius.toPx(),
paint
)
val frameworkPaint = paint.asFrameworkPaint()
frameworkPaint.xfermode = PorterDuffXfermode(PorterDuff.Mode.DST_OUT)
if (blur.toPx() > 0) {
frameworkPaint.maskFilter = BlurMaskFilter(blur.toPx(), BlurMaskFilter.Blur.NORMAL)
}
val left = if (offsetX > 0.dp) {
rect.left + offsetX.toPx()
} else {
rect.left
}
val top = if (offsetY > 0.dp) {
rect.top + offsetY.toPx()
} else {
rect.top
}
val right = if (offsetX < 0.dp) {
rect.right + offsetX.toPx()
} else {
rect.right
}
val bottom = if (offsetY < 0.dp) {
rect.bottom + offsetY.toPx()
} else {
rect.bottom
}
paint.color = Color.Black
it.drawRoundRect(
left = left + spread.toPx() / 2,
top = top + spread.toPx() / 2,
right = right - spread.toPx() / 2,
bottom = bottom - spread.toPx() / 2,
cornersRadius.toPx(),
cornersRadius.toPx(),
paint
)
frameworkPaint.xfermode = null
frameworkPaint.maskFilter = null
}
}
用法:
Box(
modifier = Modifier
.width(240.dp)
.height(180.dp)
.outerShadow(
color = Color(0xff000000),
alpha = 0.5f,
cornersRadius = 20.dp,
shadowBlurRadius = 30.dp,
offsetX = 0.dp,
offsetY = 15.dp
)
.clip(RoundedCornerShape(20.dp))
.background(Color(0xFF282A2F))
.innerShadow(
blur = 1.dp,
color = Color(0xff00FFFF),
cornersRadius = 20.dp,
offsetX = (-40.5).dp,
offsetY = (-10.5).dp
)
.innerShadow(
blur = 20.dp,
color = Color(0xffff0000),
cornersRadius = 20.dp,
offsetX = 0.5.dp,
offsetY = 0.5.dp
)
.padding(14.dp),
contentAlignment = Alignment.Center
) {
Text(
text = stringResource(id = R.string.notification_service),
modifier = Modifier,
color = Color.White
)
}
我希望它有所幫助。 outerShadow
也是自定義修飾符,從其他網站復制而來。
Modifier.shadow
相對於 Modifier.background 的位置會在組件內放置陰影。 您還可以創建 Modifier.drawWithContent 和 frameworkPaint 一個帶有模糊的顯示。
Column(
modifier = Modifier
.fillMaxSize()
.padding(20.dp)
) {
ComponentWithInnerShadow()
Spacer(modifier = Modifier.height(12.dp))
ComponentWithOuterShadow()
Spacer(modifier = Modifier.height(12.dp))
ComponentWithCustomInnerShadow()
}
@Composable private fun ComponentWithInnerShadow() {
Column(
modifier = Modifier
.clip(RoundedCornerShape(5.dp))
.background(Color.Yellow)
.shadow(2.dp, shape = RoundedCornerShape(5.dp))
) {
Text(text = "Hello World", modifier = Modifier.padding(12.dp))
} }
@Composable
private fun ComponentWithOuterShadow() {
Column(
modifier = Modifier
.shadow(2.dp, shape = RoundedCornerShape(5.dp))
.background(Color.Yellow)
) {
Text(text = "Hello World", modifier = Modifier.padding(12.dp))
}
}
@Composable
private fun ComponentWithCustomInnerShadow() {
Column(
modifier = Modifier.innerShadow()
) {
Text(text = "Hello World", modifier = Modifier.padding(12.dp))
}
}
並帶有組合修飾符。 我沒有設置參數,只是設置了任意數字,您可以設置自己的參數,並根據需要設置顏色。 不過,這個看起來比標准的內陰影更好。 您也需要為前景和形狀提供顏色。 我設置顏色並繪制圓角矩形進行演示
fun Modifier.innerShadow() = composed(
inspectorInfo = {
},
factory = {
val paint = remember() {
Paint()
}
val foregroundPaint = remember() {
Paint().apply {
color = Color.Yellow
}
}
val frameworkPaint = remember {
paint.asFrameworkPaint()
}
Modifier.drawWithContent {
this.drawIntoCanvas {
val color = Color.LightGray
val radius = 2.dp.toPx()
val shadowColor = color
.copy(alpha = .7f)
.toArgb()
val transparent = color
.copy(alpha = 0f)
.toArgb()
frameworkPaint.color = transparent
frameworkPaint.setShadowLayer(
radius,
0f,
0f,
shadowColor
)
val shadowRadius = 4.dp.toPx()
it.drawRoundRect(
left = 0f,
top = 0f,
right = this.size.width,
bottom = this.size.height,
radiusX = 5.dp.toPx(),
radiusY = 5.dp.toPx(),
paint = foregroundPaint
)
it.drawRoundRect(
left = 0f,
top = 0f,
right = this.size.width,
bottom = this.size.height,
radiusX = 5.dp.toPx(),
radiusY = 5.dp.toPx(),
paint = paint
)
it.drawRoundRect(
left = shadowRadius,
top = shadowRadius,
right = this.size.width - shadowRadius,
bottom = this.size.height - shadowRadius,
radiusX = 5.dp.toPx(),
radiusY = 5.dp.toPx(),
paint = foregroundPaint
)
drawContent()
}
}
}
)
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