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SwipeToDelete is a boilerplate-free simple implementation of SwipeToDismiss for bidirectional delete gestures in Jetpack Compose.
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import androidx.compose.animation.animateColorAsState | |
import androidx.compose.animation.core.animateFloatAsState | |
import androidx.compose.foundation.background | |
import androidx.compose.foundation.layout.Box | |
import androidx.compose.foundation.layout.RowScope | |
import androidx.compose.foundation.layout.fillMaxSize | |
import androidx.compose.foundation.layout.padding | |
import androidx.compose.material.* | |
import androidx.compose.material.icons.Icons | |
import androidx.compose.material.icons.filled.Delete | |
import androidx.compose.runtime.Composable | |
import androidx.compose.runtime.getValue | |
import androidx.compose.ui.Alignment | |
import androidx.compose.ui.Modifier | |
import androidx.compose.ui.draw.scale | |
import androidx.compose.ui.graphics.Color | |
import androidx.compose.ui.unit.dp | |
/* | |
Usage example: | |
// rememberDeleteState is a wrapper for rememberDismissState. | |
// You only need to pass a delete callback to it and it handles the rest. | |
val deleteState = rememberDeleteState( | |
onDelete = { viewModel.remove(item) } | |
) | |
// SwipeToDelete needs only rememberDeleteState's value and the item's content to work. | |
SwipeToDelete(state = deleteState) { | |
Card( | |
// And you can still access the same DismissState properties to aid with animations. | |
elevation = animateDpAsState( | |
if (deleteState.dismissDirection != null) 4.dp else 0.dp | |
).value | |
) { | |
ItemView(item) | |
} | |
} | |
// Note: It uses experimental Material APIs | |
*/ | |
@OptIn(ExperimentalMaterialApi::class) | |
@Composable | |
fun rememberDeleteState( | |
onDelete: () -> Unit | |
): DismissState { | |
return rememberDismissState( | |
confirmStateChange = { | |
if (it == DismissValue.DismissedToStart || it == DismissValue.DismissedToEnd) { | |
onDelete() | |
true | |
} else false | |
} | |
) | |
} | |
@OptIn(ExperimentalMaterialApi::class) | |
@Composable | |
fun SwipeToDelete( | |
state: DismissState, | |
content: @Composable RowScope.() -> Unit | |
) { | |
SwipeToDismiss( | |
state = state, | |
directions = setOf(DismissDirection.StartToEnd, DismissDirection.EndToStart), | |
dismissThresholds = { direction -> | |
FractionalThreshold(if (direction == DismissDirection.StartToEnd) 0.25f else 0.5f) | |
}, | |
background = { | |
val direction = state.dismissDirection ?: return@SwipeToDismiss | |
val color by animateColorAsState( | |
when (state.targetValue) { | |
DismissValue.Default -> Color.LightGray.copy(alpha = 0.5f) | |
else -> Color.Red | |
} | |
) | |
val alignment = when (direction) { | |
DismissDirection.StartToEnd -> Alignment.CenterStart | |
DismissDirection.EndToStart -> Alignment.CenterEnd | |
} | |
val scale by animateFloatAsState( | |
if (state.targetValue == DismissValue.Default) 0.75f else 1f | |
) | |
Box( | |
Modifier | |
.fillMaxSize() | |
.background(color) | |
.padding(horizontal = 20.dp), | |
contentAlignment = alignment | |
) { | |
Icon( | |
Icons.Default.Delete, | |
contentDescription = "Remove item", | |
modifier = Modifier.scale(scale) | |
) | |
} | |
}, | |
dismissContent = content | |
) | |
} |
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