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feat: add dragDropItemsIndexed extension

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andrekir 2024-06-30 08:05:11 -03:00 • committed by Andre K
parent c95cba097c
commit 66babdf735
1 changed files with 35 additions and 0 deletions
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35
app/src/main/java/com/geeksville/mesh/ui/components/LazyColumnDragAndDropDemo.kt
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@ -33,6 +33,7 @@ import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.LazyItemScope
import androidx.compose.foundation.lazy.LazyListItemInfo
import androidx.compose.foundation.lazy.LazyListScope
import androidx.compose.foundation.lazy.LazyListState
import androidx.compose.foundation.lazy.itemsIndexed
import androidx.compose.foundation.lazy.rememberLazyListState
@ -268,3 +269,37 @@ fun LazyItemScope.DraggableItem(
}
Column(modifier = modifier.then(draggingModifier)) { content(dragging) }
}
/**
* Extension function for [LazyListScope] with drag-and-drop functionality for indexed items.
*
* Wraps [itemsIndexed] function with [detectDragGesturesAfterLongPress] to enable long-press
* drag gestures and allow items in the list to be reordered using the provided [DragDropState].
*
* Uses the item's `hashCode()` key internally (instead of the index) to allow handling headers,
* footers, and other non-draggable items.
*
* @param items The list of items to be displayed in the [LazyColumn].
* @param dragDropState The state object managing drag-and-drop interactions.
* @param contentType A function providing the content type of each item, used for item recycling
* optimizations. Defaults to null.
* @param itemContent A composable function defining the UI for each item. It provides the index,
* the item itself, and a boolean indicating if the item is currently being dragged.
*/
inline fun <T> LazyListScope.dragDropItemsIndexed(
items: List<T>,
dragDropState: DragDropState,
crossinline contentType: (index: Int, item: T) -> Any? = { _, _ -> null },
crossinline itemContent: @Composable LazyItemScope.(index: Int, item: T, isDragging: Boolean) -> Unit
) = itemsIndexed(
items = items,
key = { _, item -> item.hashCode() },
contentType = contentType,
itemContent = { index, item ->
DraggableItem(
dragDropState = dragDropState,
key = item.hashCode(),
content = { isDragging -> itemContent(index, item, isDragging) }
)
}
)