SwipeableItemRow.kt

import androidx.annotation.DrawableRes
import androidx.compose.animation.core.animateDpAsState
import androidx.compose.foundation.clickable
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.BoxWithConstraints
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxHeight
import androidx.compose.foundation.layout.offset
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.wrapContentHeight
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.Button
import androidx.compose.material.ButtonDefaults
import androidx.compose.material.ExperimentalMaterialApi
import androidx.compose.material.Icon
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Text
import androidx.compose.material.rememberSwipeableState
import androidx.compose.material.swipeable
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.draw.shadow
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.RectangleShape
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.dp
import kotlin.math.roundToInt

@OptIn(ExperimentalMaterialApi::class)
@Composable
fun <T> SwipeableItemRow(
  modifier: Modifier,
  item: T,
  swiped: Boolean,
  onSwipe: (T, Boolean) -> Unit,
  onClick: () -> Unit,
  actionButtons: List<ActionButtonModel>,
  itemRow: @Composable (Modifier) -> Unit,
) {
  val swipeableState = rememberSwipeableState(
    initialValue = false,
    confirmStateChange = {
      onSwipe(item, it)
      it
    },
  )
  LaunchedEffect(swiped) { swipeableState.animateTo(swiped) }
  BoxWithConstraints(
    modifier = modifier
        .wrapContentHeight(),
  ) {
    val (revealedRatio, swipedRatio) =
      actionButtons.size.let {
        require(it <= 3) { "Only 3 action buttons are supported" }

        when (it) {
          1 -> 0.70f to 0.3f
          2 -> 0.50f to 0.5f
          3 -> 0.30f to 0.7f
          else -> error("Unhandled")
        }
      }
    val swipeWidth = constraints.maxWidth * swipedRatio
    val boxScope = this
    Box(
      modifier = Modifier
          .wrapContentHeight()
          .swipeable(
              state = swipeableState,
              anchors = mapOf(-swipeWidth to true, 0f to false),
              orientation = Orientation.Horizontal,
          ),
    ) {
      Row(
        modifier = Modifier
            .matchParentSize()
            .align(Alignment.CenterEnd)
            .padding(start = boxScope.maxWidth * revealedRatio),
        verticalAlignment = Alignment.CenterVertically,
      ) {
        actionButtons.forEach {
          ActionButton(
            modifier = Modifier
                .fillMaxHeight()
                .weight(1f),
            model = it
          )
        }
      }

      val baseCornerRadius = 8.dp
      val fractionalCornerRadius = baseCornerRadius * swipeableState.progress.fraction
      val cornerCalculation = when {
        swipeableState.progress.to -> fractionalCornerRadius
        swipeableState.progress.from -> baseCornerRadius - fractionalCornerRadius
        else -> 0.dp
      }

      val baseElevation = 8.dp
      val fractionalElevation = baseElevation * swipeableState.progress.fraction
      val elevationCalculation = when {
        swipeableState.progress.to -> fractionalElevation
        swipeableState.progress.from -> baseElevation - fractionalElevation
        else -> 0.dp
      }

      val cornerRadius =
        animateDpAsState(targetValue = cornerCalculation, label = "rowCorner")
      val elevation =
        animateDpAsState(targetValue = elevationCalculation, label = "rowElevation")
      val shape =
        RoundedCornerShape(topEnd = cornerRadius.value, bottomEnd = cornerRadius.value)
      Column {
        itemRow(
            Modifier
                .offset {
                    IntOffset(
                        x = swipeableState.offset.value.roundToInt(),
                        y = 0,
                    )
                }
                .clickable { onClick() }
                .clip(shape)
                .shadow(
                    elevation = elevation.value,
                    shape = shape,
                ),
        )
      }
    }
  }
}

data class ActionButtonModel(
  val backgroundColor: Color,
  val onClick: () -> Unit,
  @DrawableRes val iconResId: Int,
  val iconTint: Color = Color.Unspecified,
  val text: String,
)

@Composable
fun ActionButton(
  modifier: Modifier = Modifier,
  model: ActionButtonModel
) {
  Button(
    modifier = modifier,
    colors = ButtonDefaults.buttonColors(backgroundColor = model.backgroundColor),
    shape = RectangleShape,
    onClick = { model.onClick() },
  ) {
    Column(
      modifier = Modifier.fillMaxHeight(),
      horizontalAlignment = Alignment.CenterHorizontally,
      verticalArrangement = Arrangement.Center,
    ) {
      Icon(
        modifier = Modifier.size(16.dp),
        painter = painterResource(id = model.iconResId),
        contentDescription = null,
        tint = model.iconTint,
      )
      Spacer(modifier = Modifier.size(8.dp))
      Text(
        text = model.text,
        style = MaterialTheme.typography.subtitle2.copy(fontWeight = FontWeight.Bold),
      )
    }
  }
}