关于

  本篇主要记录一些开发中可能用到的常用方法的扩展记录，包括防快速带点击，画虚实线divider，画虚线边框，绘制阴影等。

防快速点击

inline fun Modifier.singleClickable(
    debounceDuration: Long = 400L,
    enabled: Boolean = true,//中间这三个是clickable自带的参数
    rippleEnabled: Boolean = true, //是否开启水波纹
    onClickLabel: String? = null,
    role: Role? = null,
    crossinline onClick: () -> Unit
): Modifier = composed {
    var lastClickTime by remember { mutableStateOf(value = 0L) }
    val eventAction: () -> Unit = {
        val currentTimeMillis = System.currentTimeMillis()
        if (currentTimeMillis - debounceDuration >= lastClickTime) {
            onClick()
            lastClickTime = currentTimeMillis
        }
    }
    if (rippleEnabled) {
        clickable(enabled, onClickLabel, role, eventAction)
    } else {
        clickable(
            interactionSource = NoRippleInteractionSource(),
            indication = null,
            enabled = enabled,
            onClickLabel = onClickLabel,
            role = role,
            onClick = eventAction
        )
    }
}

class NoRippleInteractionSource : MutableInteractionSource {

    override val interactions: Flow<Interaction> = emptyFlow()

    override suspend fun emit(interaction: Interaction) {}

    override fun tryEmit(interaction: Interaction) = true

}

虚实分割线

/**
 * 虚实分割线
 * 实线虚线长度都为10f 根据实际需求更改下方PathEffect里面的float参数数据
 **/
internal fun Modifier.dashedDivider(strokeWidth: Dp, color: Color) = drawBehind {
    drawIntoCanvas {
        val paint = Paint()
            .apply {
                this.strokeWidth = strokeWidth.toPx()
                this.color = color
                style = PaintingStyle.Stroke
                pathEffect = PathEffect.dashPathEffect(floatArrayOf(10f, 10f), 0f)
            }
        it.drawLine(
            Offset(0f, size.height / 2),
            Offset(size.width, size.height / 2),
            paint
        )
    }
}

  使用如下：

 Divider(
                color = Color.Transparent,
                modifier = Modifier
                    .fillMaxWidth()
                    .dashedDivider(1.dp, Color(222, 46, 66, 255),
                    )
            )

  效果如下：

虚线边框

/**
 * 虚线边框
 * @param width 虚线宽度
 * @param radius 边框角度
 * @param color 边框颜色
 * 虚实间隔也是写死的10f
 **/
internal fun Modifier.dashedBorder(width: Dp, radius: Dp, color: Color) =
    drawBehind {
        drawIntoCanvas {
            val paint = Paint()
                .apply {
                    strokeWidth = width.toPx()
                    this.color = color
                    style = PaintingStyle.Stroke
                    pathEffect = PathEffect.dashPathEffect(floatArrayOf(10f, 10f), 0f)
                }
            it.drawRoundRect(
                width.toPx(),
                width.toPx(),
                size.width - width.toPx(),
                size.height - width.toPx(),
                radius.toPx(),
                radius.toPx(),
                paint
            )
        }
    }

  使用如下：

Spacer(modifier = Modifier.height(24.dp))
// 正方形
            Box(
                modifier = Modifier
                    .padding(top = 16.dp)
                    .width(120.dp)
                    .height(120.dp)
                    .align(Alignment.Start)
                    .dashedBorder(
                        width = 2.dp,
                        color = Color(222, 46, 66, 255),
                        radius = 0.dp
                    ),
                contentAlignment = Alignment.Center,
            ){}

            Spacer(modifier = Modifier.height(24.dp))
            //圆形
            Box(
                modifier = Modifier
                    .padding(top = 16.dp)
                    .width(120.dp)
                    .height(120.dp)
                    .align(Alignment.Start)
                    .dashedBorder(
                        width = 2.dp,
                        color = Color(222, 46, 66, 255),
                        radius = 90.dp
                    ),
                contentAlignment = Alignment.Center,
            ){}

  效果如下：

阴影

fun Modifier.drawShadow(
    color: Color = Color.Black.copy(alpha = 0.1f),
    borderRadius: Dp = 0.dp,
    blurRadius: Dp = 8.dp,//模糊半径
    offsetY: Dp = 0.dp, 
    offsetX: Dp = 0.dp, //便宜
    spread: Dp = 0f.dp, //扩散
) = drawBehind {
    this.drawIntoCanvas {
        val paint = Paint()
        val frameworkPaint = paint.asFrameworkPaint()
        val spreadPixel = spread.toPx()
        val leftPixel = (0f - spreadPixel) + offsetX.toPx()
        val topPixel = (0f - spreadPixel) + offsetY.toPx()
        val rightPixel = (this.size.width + spreadPixel)
        val bottomPixel = (this.size.height + spreadPixel)

        if (blurRadius != 0.dp) {
            frameworkPaint.maskFilter =
                (BlurMaskFilter(blurRadius.toPx(), BlurMaskFilter.Blur.NORMAL))
        }

        frameworkPaint.color = color.toArgb()
        it.drawRoundRect(
            left = leftPixel,
            top = topPixel,
            right = rightPixel,
            bottom = bottomPixel,
            radiusX = borderRadius.toPx(),
            radiusY = borderRadius.toPx(),
            paint
        )
    }
}

  使用：

Spacer(modifier = Modifier.height(24.dp))
            Box(
                modifier = Modifier
                    .size(120.dp,120.dp)
                    .drawShadow(color = Color.Black.copy(alpha = 0.4f),
                        offsetY = 8.dp, offsetX = 8.dp,
                        spread = 4.dp,
                    )
                    .background(
                        color = Color(51, 204, 255, 255),
                        shape = RoundedCornerShape(8.dp),
                    ),
            ) {

            }

  效果如下：