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compose-drag-drop-list

drag-drop

Overview

The DragDropList composable is a composable that enables drag-and-drop reordering of items in a list. It is designed to work seamlessly with Jetpack Compose and can be easily integrated into your Compose-based Android application.

Usage

See the example app

DragDropList(
    items = myList,
    onMove = { from, to ->
        // Update the list using the mutable state variable
        val fromItem = myList[from]
        val toItem = myList[to]
        val newList = myList.toMutableList()
        newList[from] = toItem
        newList[to] = fromItem
        myList = newList // Update the mutable state
    },
    onDragFinished = { // Do heavy task here (like room DB update) }
) {
    Card(
        modifier = Modifier
            .fillMaxWidth()
            .padding(8.dp)
            .height(64.dp),
        elevation = 4.dp,
        backgroundColor = MaterialTheme.colors.primary,
        border = BorderStroke(1.dp, MaterialTheme.colors.secondary),
    ) {
        Box(
            modifier = Modifier.fillMaxSize(),
            contentAlignment = Alignment.Center
        ) {
            Text(
                it,
                color = Color.White,
                fontSize = 16.sp
            )
        }
    }
    Spacer(modifier = Modifier.height(8.dp))
}

Parameters

items: A list of items to be displayed in the drag-and-drop list.

onMove: A lambda that is called when an item is moved. It provides the fromIndex and toIndex of the item being moved, allowing you to update your data accordingly.

onDragFinished: Called when the drag n drop is terminated. use it for heavy tasks (Room DB update for example)

modifier: An optional modifier that can be used to customize the appearance and behavior of the DragDropList.

itemComposable: A lambda that takes an item from the items list and defines how it should be displayed within the list.

Features

Drag-and-Drop Reordering: Users can reorder items in the list by simply dragging and dropping them to their desired position.

Smooth Animations: The composable provides smooth animations for item transitions during drag-and-drop operations.

Customization: You can customize the appearance of each item by providing your own itemComposable lambda.

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