A library that allows you to easily add drag and drop functionality to your Jetpack Compose or Compose Multiplatform projects.

Try the live demo · Documentation

• Drag and Drop -- Drag items from one location and drop them onto designated targets
• Reorder Lists -- Reorder items within a list using drag and drop gestures
• Auto Scroll -- Automatically scroll containers when dragging items near edges
• Drop Strategies -- Choose from multiple built-in strategies to determine which drop target receives the dragged item
• Drag Handle -- Restrict the drag gesture to a specific handle area within the item
• Axis Lock -- Constrain dragging to the horizontal or vertical axis
• Conditional Drop -- Control which drop targets accept which dragged items
• Drop Animation -- Smooth spring-based animations when items are dropped
• Custom Drag Shadow -- Provide a custom composable to display while an item is being dragged

Add the following dependency to your module build.gradle.kts file:

implementation("com.mohamedrejeb.dnd:compose-dnd:0.5.0")

For Kotlin Multiplatform projects, add the dependency to your commonMain source set:

kotlin {
    sourceSets {
        commonMain.dependencies {
            implementation("com.mohamedrejeb.dnd:compose-dnd:0.5.0")
        }
    }
}

Create a DragAndDropState, wrap your content with DragAndDropContainer, and use the draggableItem and dropTarget modifiers:

val dragAndDropState = rememberDragAndDropState<String>()

DragAndDropContainer(
    state = dragAndDropState,
) {
    val isDragging = dragAndDropState.isDragging("item-1")

    Text(
        text = "Drag me",
        modifier = Modifier
            .graphicsLayer { alpha = if (isDragging) 0f else 1f }
            .draggableItem(
                key = "item-1",
                data = "Hello",
                state = dragAndDropState,
                draggableContent = {
                    Text("Drag me") // Shown as the drag shadow
                },
            ),
    )

    Box(
        modifier = Modifier
            .dropTarget(
                key = "target-1",
                state = dragAndDropState,
                onDrop = { state ->
                    println("Dropped: ${state.data}")
                },
            )
    ) {
        Text("Drop here")
    }
}

The reorderableItem modifier makes an item both draggable and a drop target, which is all a sortable list needs:

val dndState = rememberDragAndDropState<String>()

DragAndDropContainer(
    state = dndState,
) {
    LazyColumn {
        items(items, key = { it }) { item ->
            Text(
                text = item,
                modifier = Modifier
                    .graphicsLayer { alpha = if (dndState.isDragging(item)) 0f else 1f }
                    .reorderableItem(
                        key = item,
                        data = item,
                        state = dndState,
                        onDragEnter = { state ->
                            items = items.toMutableList().apply {
                                val index = indexOf(item)
                                if (index != -1) {
                                    remove(state.data)
                                    add(index, state.data)
                                }
                            }
                        },
                        draggableContent = {
                            Text(item)
                        },
                    ),
            )
        }
    }
}

Toggle drag and drop at the container level:

DragAndDropContainer(
    state = dragAndDropState,
    enabled = false,
) { }

Or for a specific item by passing enabled = false to the draggableItem or reorderableItem modifier.

Prefer wrapping composables instead of modifiers? The DraggableItem and ReorderableItem wrapper composables offer the same features - see the documentation.

For more details and advanced features (auto scroll, drop strategies, drag handles, axis lock), check out the documentation and the sample project.

If you've found an error in this library, please file an issue.

Feel free to help out by sending a pull request.

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Copyright 2023 Mohamed Rejeb

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.