Friday, April 2, 2021

jetpack compose - Animate content size

MainActivity.kt

package com.cfsuman.jetpackcompose

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import androidx.activity.compose.setContent
import androidx.compose.animation.animateContentSize
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.*
import androidx.compose.material.*
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.font.FontFamily
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp

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

        setContent {
            MainContent()
        }
    }


    @Composable
    fun MainContent(){
        val shortText = "This is a short text."
        val longtext = "Lorem Ipsum is simply dummy text of the printing" +
                " and typesetting industry. Lorem Ipsum has been the" +
                " industry's standard dummy text ever since the 1500s," +
                " when an unknown printer took a galley of type and" +
                " scrambled it to make a type specimen book."

        val isShortText = remember { mutableStateOf(true) }

        Column(
            modifier = Modifier
                .background(Color(0xFFEDEAE0))
                .padding(16.dp)
                .fillMaxSize(),
            verticalArrangement = Arrangement.spacedBy(8.dp)
        ){
            Button(
                onClick = {
                    isShortText.value = !isShortText.value
                },
            ) {
                Text(if (isShortText.value) "Long Text" else "Short Text")
            }

            Box(
                modifier = Modifier
                    .background(Color(0xFFFF9966))
                    .padding(16.dp)
                    .fillMaxWidth()
                    .animateContentSize()
            ) {
                Text(
                    text = if (isShortText.value) shortText else longtext,
                    fontSize = 30.sp,
                    fontWeight = FontWeight.Bold,
                    textAlign = TextAlign.Center,
                    fontFamily = FontFamily.Cursive,
                    color = Color(0xFFA52A2A)
                )
            }
        }
    }


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