Wednesday, April 21, 2021

jetpack compose - Swiping

MainActivity.kt

package com.cfsuman.jetpackcompose

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.compose.animation.animateColorAsState
import androidx.compose.animation.core.tween
import androidx.compose.foundation.background
import androidx.compose.foundation.gestures.Orientation
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.*
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.ColorLens
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalDensity
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.IntOffset
import androidx.compose.ui.unit.dp
import kotlin.math.roundToInt

class MainActivity : AppCompatActivity() {
    @ExperimentalMaterialApi
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        setContent {
            MainContent()
        }
    }


    @ExperimentalMaterialApi
    @Composable
    fun MainContent(){
        var bgColor:Color by remember {
            mutableStateOf(Color(0xFF88540B))
        }

        val color = animateColorAsState(
            targetValue = bgColor,
            animationSpec = tween(
                durationMillis = 2000
            )
        )

        val squareSize = 150.dp
        val swipeAbleState = rememberSwipeableState(0)
        val sizePx = with(LocalDensity.current) { squareSize.toPx() }
        val anchors = mapOf(0f to 0, sizePx to 1)

        Column(
            modifier = Modifier
                .background(Color(0xFFEDEAE0))
                .fillMaxSize()
                .padding(16.dp),
            verticalArrangement = Arrangement.Center,
            horizontalAlignment = Alignment.CenterHorizontally
        ) {
            Box(
                modifier = Modifier
                    .fillMaxWidth()
                    .clip(RoundedCornerShape(16.dp))
                    .background(Color(0xFFBFAFB2))
                    .padding(8.dp)
                    .swipeable(
                        state = swipeAbleState,
                        anchors = anchors,
                        thresholds = { _, _ ->
                            FractionalThreshold(0.3f)
                        },
                        orientation = Orientation.Horizontal
                    )
            ) {
                Column(
                    modifier = Modifier.padding(16.dp)
                ) {
                    IconButton(onClick = {
                        bgColor = Color(0xFF2A52BE)
                    }) {
                        Icon(
                            Icons.Filled.ColorLens,
                            contentDescription = "Localized description",
                            tint = Color(0xFF2A52BE)
                        )
                    }
                    IconButton(onClick = {
                        bgColor = Color(0xFFE30022)
                    }) {
                        Icon(
                            Icons.Filled.ColorLens,
                            contentDescription = "Localized description",
                            tint = Color(0xFFE30022)
                        )
                    }
                }

                Box(
                    Modifier
                        .offset {
                            IntOffset(
                                swipeAbleState.offset.value.roundToInt(),
                                0
                            )
                        }
                        .clip(RoundedCornerShape(16.dp))
                        .fillMaxWidth(0.95F)
                        .height(150.dp)
                        .background(color.value)
                )
            }
        }
    }


    @Preview
    @Composable
    fun ComposablePreview(){
        //MainContent()
    }
}