Implement Vertical and Horizontal Draggable Modifier in Android using Jetpack Compose

Last Updated : 20 Apr, 2022

In Jetpack Compose, a Draggable modifier is a modifier similar to scrollable, which is the high-level entry point to drag gestures in a single orientation and report the drag distance in pixels. Draggable modifier can be implemented on top of any element. Users can hold the element state and drag it vertically and horizontally.

In this article, we will show you how you could implement a Draggable Modifier in Android using Jetpack Compose. Follow the below steps once the IDE is ready.

Step by Step Implementation

Step 1: Create a New Project in Android Studio

To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. While choosing the template, select Empty Compose Activity. If you do not find this template, try upgrading the Android Studio to the latest version. We demonstrated the application in Kotlin, so make sure you select Kotlin as the primary language while creating a New Project.

Step 2: Working with the MainActivity.kt file

Go to the MainActivity.kt file and refer to the following code. Below is the code for the MainActivity.kt file. Comments are added inside the code to understand the code in more detail.

Kotlin

package com.geeksforgeeks.jcdraggablemodifier

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.gestures.draggable
import androidx.compose.foundation.gestures.rememberDraggableState
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import kotlin.math.roundToInt

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {

            // Creating a Simple Scaffold
            // Layout for the application
            Scaffold(

                // Creating a Top Bar
                topBar = { TopAppBar(title = { Text("GFG | Draggable Modifier", color = Color.White) }, backgroundColor = Color(0xff0f9d58)) },

                // Creating Content
                content = {

                    // Creating a Column Layout
                    Column(Modifier.fillMaxSize(), horizontalAlignment = Alignment.CenterHorizontally, verticalArrangement = Arrangement.Center) {

                        // Horizontally Draggable Modifier
                        var offsetX by remember { mutableStateOf(0f) }
                        Text(
                            modifier = Modifier
                                .offset { IntOffset(offsetX.roundToInt(), 0) }
                                .draggable(
                                    orientation = Orientation.Horizontal,
                                    state = rememberDraggableState { delta ->
                                        offsetX += delta
                                    }
                                ),
                            text = "I move Horizontally!", fontSize = 20.sp
                        )

                        // Adding a Space of 100dp height
                        Spacer(modifier = Modifier.height(100.dp))

                        // Vertically Draggable Modifier
                        var offsetY by remember { mutableStateOf(0f) }
                        Text(
                            modifier = Modifier
                                .offset { IntOffset(0, offsetY.roundToInt()) }
                                .draggable(
                                    orientation = Orientation.Vertical,
                                    state = rememberDraggableState { delta ->
                                        offsetY += delta
                                    }
                                ),
                            text = "I move Vertically!", fontSize = 20.sp
                        )

                    }
                }
            )
        }
    }
}