Compose components 1

박채빈·2024년 1월 24일

AndroidStudy

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Text

Default

@Composable
fun Greeting(name: String) {
  Text(text = "Hello $name")
}

Color

@Composable
fun Greeting(name: String) {
  Text(color = Color.Red, text = "Hello $name")
}

Color2

@Composable
fun Greeting(name: String) {
  Text(color = Color(0xffff9944), text = "Hello $name")
}

Font weight

@Composable
fun Greeting(name: String) {
  Text(color = Color(0xffff9944), text = "Hello $name", fontSize = 30.sp, fontWeight = FontWeight.Bold)
}

Font family

@Composable
fun Greeting(name: String) {
  Text(
    color = Color(0xffff9944),
    text = "Hello $name",
    fontSize = 30.sp,
    fontWeight = FontWeight.Bold,
    fontFamily = FontFamily.Cursive
  )
}

Letter spacing

@Composable
fun Greeting(name: String) {
  Text(
    color = Color(0xffff9944),
    text = "Hello $name",
    fontSize = 30.sp,
    fontWeight = FontWeight.Bold,
    fontFamily = FontFamily.Cursive,
    letterSpacing = 2.sp
  )
}

Max lines

@Composable
fun Greeting(name: String) {
  Text(
    color = Color(0xffff9944),
    text = "Hello $name\nHello $name\nHello $name",
    fontSize = 30.sp,
    fontWeight = FontWeight.Bold,
    fontFamily = FontFamily.Cursive,
    letterSpacing = 2.sp,
    maxLines = 2
  )
}

Text decoration

@Composable
fun Greeting(name: String) {
  Text(
    color = Color(0xffff9944),
    text = "Hello $name\nHello $name\nHello $name",
    fontSize = 30.sp,
    fontWeight = FontWeight.Bold,
    fontFamily = FontFamily.Cursive,
    letterSpacing = 2.sp,
    maxLines = 2,
    textDecoration = TextDecoration.Underline
  )
}

Text align, modifier

@Composable
fun Greeting(name: String) {
  Text(
    modifier = Modifier.width(300.dp),
    color = Color(0xffff9944),
    text = "Hello $name\nHello $name\nHello $name",
    fontSize = 30.sp,
    fontWeight = FontWeight.Bold,
    fontFamily = FontFamily.Cursive,
    letterSpacing = 2.sp,
    maxLines = 2,
    textDecoration = TextDecoration.Underline,
    textAlign = TextAlign.Center
  )
}

Button

Default

@Composable
fun ButtonExample(onButtonClicked: () -> Unit) {
  Button(onClick = onButtonClicked) {
    Text(text = "Send")
  }
}

Click event toast

class MainActivity : ComponentActivity() {
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContent {
      ComposePracticeTheme {
        ButtonExample {
          Toast.makeText(this, "show toast", Toast.LENGTH_SHORT).show() // 여기에서 버튼 이벤트 정의
        }
      }
    }
  }
}

@Composable
fun ButtonExample(onButtonClicked: () -> Unit) {
  Button(onClick = {}) {
    Text(text = "Send")
  }
}

Icon 추가

@Composable
fun ButtonExample(onButtonClicked: () -> Unit) {
  Button(onClick = onButtonClicked) {
    Icon(
      imageVector = Icons.Filled.Send,    // 이미지
      contentDescription = "something send"  // 벡터 이미지 설명
    )
    Text(text = "Send")
  }
}

Icon, Text 사이에 Spacer 추가

@Composable
fun ButtonExample(onButtonClicked: () -> Unit) {
  Button(onClick = onButtonClicked) {
    Icon(
      imageVector = Icons.Filled.Send,    // 이미지
      contentDescription = "something send"  // 벡터 이미지 설명
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
//    Spacer(modifier = Modifier.size(30.dp))
    Text(text = "Send")
  }
}

Enabled 속성

@Composable
fun ButtonExample(onButtonClicked: () -> Unit) {
  Button(
    onClick = onButtonClicked,
    enabled = false
  ) {
    Icon(
      imageVector = Icons.Filled.Send,    // 이미지
      contentDescription = "something send"  // 벡터 이미지 설명
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
//    Spacer(modifier = Modifier.size(30.dp))
    Text(text = "Send")
  }
}

Border stroke

@Composable
fun ButtonExample(onButtonClicked: () -> Unit) {
  Button(
    onClick = onButtonClicked,
    enabled = true,
    border = BorderStroke(10.dp, Color.Magenta)
  ) {
    Icon(
      imageVector = Icons.Filled.Send,    // 이미지
      contentDescription = "something send"  // 벡터 이미지 설명
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
//    Spacer(modifier = Modifier.size(30.dp))
    Text(text = "Send")
  }
}

CircleShape

@Composable
fun ButtonExample(onButtonClicked: () -> Unit) {
  Button(
    onClick = onButtonClicked,
    enabled = true,
    border = BorderStroke(10.dp, Color.Magenta),
    // shape = RoundedCornerShape(10.dp)
    shape = CircleShape
  ) {
    Icon(
      imageVector = Icons.Filled.Send,    // 이미지
      contentDescription = "something send"  // 벡터 이미지 설명
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
//    Spacer(modifier = Modifier.size(30.dp))
    Text(text = "Send")
  }
}

Content Padding

@Composable
fun ButtonExample(onButtonClicked: () -> Unit) {
  Button(
    onClick = onButtonClicked,
    enabled = true,
    border = BorderStroke(10.dp, Color.Magenta),
    // shape = RoundedCornerShape(10.dp)
    shape = CircleShape,
    contentPadding = PaddingValues(20.dp)
  ) {
    Icon(
      imageVector = Icons.Filled.Send,    // 이미지
      contentDescription = "something send"  // 벡터 이미지 설명
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
//    Spacer(modifier = Modifier.size(30.dp))
    Text(text = "Send")
  }
}

Modifier

Default

@Composable
fun ModifierEx() {
  Button(onClick = {}) {
    Icon(
      imageVector = Icons.Filled.Search,
      contentDescription = "something search"
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
    Text(text = "Search")
  }
}

Modifier fillMaxSize

@Composable
fun ModifierEx() {
  Button(
    onClick = {},
    modifier = Modifier.fillMaxSize()
  ) {
    Icon(
      imageVector = Icons.Filled.Search,
      contentDescription = "something search"
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
    Text(text = "Search")
  }
}

Modifier height

@Composable
fun ModifierEx() {
  Button(
    onClick = {},
    modifier = Modifier.height(100.dp)
  ) {
    Icon(
      imageVector = Icons.Filled.Search,
      contentDescription = "something search"
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
    Text(text = "Search")
  }
}

Modifier height with width

@Composable
fun ModifierEx() {
  Button(
    onClick = {},
    modifier = Modifier
      .height(100.dp)
      .width(200.dp)
  ) {
    Icon(
      imageVector = Icons.Filled.Search,
      contentDescription = "something search"
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
    Text(text = "Search")
  }
}

Modifier size

@Composable
fun ModifierEx() {
  Button(
    onClick = {},
    modifier = Modifier.size(200.dp, 100.dp) // size(width, height)
  ) {
    Icon(
      imageVector = Icons.Filled.Search,
      contentDescription = "something search"
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
    Text(text = "Search")
  }
}

Background Color

@Composable
fun ModifierEx() {
  Button(
    onClick = {},
    modifier = Modifier
                .size(200.dp, 100.dp)
                .background(Color.Red) // Failed case: Button에서는 background 동작안함
  ) {
    Icon(
      imageVector = Icons.Filled.Search,
      contentDescription = "something search"
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
    Text(text = "Search")
  }
}

Button Color

@Composable
fun ModifierEx() {
  Button(
    colors = ButtonDefaults.buttonColors(
      Color.Magenta,  // Button 자체 색상
      contentColor = Color.Cyan  // Button 내부 content 색상
    ),
    onClick = {},
    modifier = Modifier.padding(100.dp)
  ) {
    Icon(
      imageVector = Icons.Filled.Search,
      contentDescription = "something search"
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
    Text(text = "Search")
  }
}

Modifier padding

@Composable
fun ModifierEx() {
  Button(
    colors = ButtonDefaults.buttonColors(
      Color.Magenta,
      contentColor = Color.Cyan
    ),
    onClick = {},
    modifier = Modifier.padding(100.dp)
  ) {
    Icon(
      imageVector = Icons.Filled.Search,
      contentDescription = "something search"
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
    Text(text = "Search")
  }
}

Click 범위 설정

@Composable
fun ModifierEx() {
  Button(
    colors = ButtonDefaults.buttonColors(
      Color.Magenta,
      contentColor = Color.Cyan
    ),
    onClick = {},
    modifier = Modifier.padding(100.dp),
    enabled = false // click 불가
  ) {
    Icon(
      imageVector = Icons.Filled.Search,
      contentDescription = "something search"
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
    Text(
      text = "Search",
      modifier = Modifier.clickable {}
    )
  }
}

Offset

@Composable
fun ModifierEx() {
  Button(
    colors = ButtonDefaults.buttonColors(
      Color.Magenta,
      contentColor = Color.Cyan
    ),
    onClick = {},
    modifier = Modifier.padding(100.dp),  
  ) {
    Icon(
      imageVector = Icons.Filled.Search,
      contentDescription = "something search"
    )
    Spacer(modifier = Modifier.size(ButtonDefaults.IconSpacing))
    Text(
      text = "Search",
      modifier = Modifier.offset(x = 10.dp) // offset 설정
    )
  }
}

spacer와 text 사이에 offset이 설정된 모습

Surface

가장 기본적으로 UI를 구축하는 기반.

젯팩은 margin 고려하지 않음.

Text에 마진을 가져야 한다면, Text를 포함하는 Surface에 패딩을 설정

Default

@Composable
fun SurfaceEx(name: String) {
  Surface(
    modifier = Modifier.padding(5.dp)
  ) {
    Text(text = "Hello $name!", modifier = Modifier.padding(8.dp))
  }
}

Elevation 설정

@Composable
fun SurfaceEx(name: String) {
  Surface(
    modifier = Modifier.padding(5.dp),
    shadowElevation = 10.dp  // 그림자 생김
  ) {
    Text(text = "Hello $name!", modifier = Modifier.padding(8.dp))
  }
}

Border 설정

@Composable
fun SurfaceEx(name: String) {
  Surface(
    modifier = Modifier.padding(5.dp),
    shadowElevation = 10.dp,
    border = BorderStroke(width = 2.dp, color = Color.Magenta)
  ) {
    Text(text = "Hello $name!", modifier = Modifier.padding(8.dp))
  }
}

Shape 설정

@Composable
fun SurfaceEx(name: String) {
  Surface(
    modifier = Modifier.padding(5.dp),
    shadowElevation = 10.dp,
    border = BorderStroke(width = 2.dp, color = Color.Magenta),
    shape = CircleShape
  ) {
    Text(text = "Hello $name!", modifier = Modifier.padding(8.dp))
  }
}

Color 설정

@Composable
fun SurfaceEx(name: String) {
  Surface(
    modifier = Modifier.padding(5.dp),
    shadowElevation = 10.dp,
    border = BorderStroke(width = 2.dp, color = Color.Magenta),
    shape = CircleShape,
    color = MaterialTheme.colorScheme.surface // error, primary 등.
  ) {
    Text(text = "Hello $name!", modifier = Modifier.padding(8.dp))
  }
}

Content color를 따로 설정하지 않으면 배경 color에 맞춰 적당한 색으로 바꿔줌.

Box

box 자체를 사용하려는 용도

frame layout같이 중첩하기 위한 용도

Default

@Composable
fun BoxEx() {
  Box(modifier = Modifier.size(100.dp)) {
    Text(text = "Hello World!", modifier = Modifier.align(Alignment.Center)) // BottomCenter, End 등
  }
}

Text 두 개 배치

@Composable
fun BoxEx() {
  Box(modifier = Modifier.size(100.dp)) {
    Text(text = "Hello World", modifier = Modifier.align(Alignment.BottomEnd))
    Text(text = "Jetpack Compose", modifier = Modifier.align(Alignment.CenterEnd))
  }
}

두 개의 박스를 박스 안에 배치

@Composable
fun BoxEx() {
  Box(modifier = Modifier.size(100.dp)) {
    Box(modifier = Modifier.size(70.dp).background(Color.Cyan).align(Alignment.CenterStart))
    Box(modifier = Modifier.size(70.dp).background(Color.Yellow).align(Alignment.BottomEnd))
  }
}

부모 박스의 modifier 설정 제거

@Composable
fun BoxEx() {
  Box {
    Box(modifier = Modifier.fillMaxSize().background(Color.Cyan).align(Alignment.CenterStart)) // matchParent 설정을 하면, 두 번째 component의 크기에 맞춤.
    Box(modifier = Modifier.size(70.dp).background(Color.Yellow).align(Alignment.BottomEnd))
  }
}

Row

Row는 수평으로 배치하는 것이기 때문에, Alignment는 항상 수직으로 적용된다.

Default

@Composable
fun RowEx() {
  Row(modifier = Modifier.height(40.dp)) {
    Text(text = "fist")
    Text(text = "second")
  }
}

각 text에 align 설정

@Composable
fun RowEx() {
  Row(modifier = Modifier.height(40.dp)) {
    Text(text = "fist", modifier = Modifier.align(Alignment.Top))
    Text(text = "second", modifier = Modifier.align(Alignment.CenterVertically))
    Text(text = "third", modifier = Modifier.align(Alignment.Bottom))
  }
}

Row에 align 설정

@Composable
fun RowEx() {
  Row(
    modifier = Modifier.height(40.dp),
    verticalAlignment = Alignment.CenterVertically
  ) {
    Text(text = "fist")
    Text(text = "second")
    Text(text = "third")
  }
}

전반적으로 vertically alignmet 설정을 하고, 부분적으로 modifier 설정을 하는게 좋음

Row width 설정

@Composable
fun RowEx() {
  Row(
    modifier = Modifier.height(40.dp).width(200.dp),
    verticalAlignment = Alignment.CenterVertically,
    horizontalArrangement = Arrangement.Center // Row가 수평 정렬이기 때문에, 수평 방향 기준으로 정렬.
                                                // SpaceBeetween  : |처음 (공백) 중간 (공백) 맨 끝|
                                                // SpaceAround    : |(공백) 처음 (공백) 중간 (공백) 맨 끝 (공백)|
                                                // SpaceEvenly    : arround랑 같아보임..?
  ) {
    Text(text = "fist")
    Text(text = "second")
    Text(text = "third")
  }
}

각 text에 weight 설정

fun RowEx() {
  Row(
    modifier = Modifier
      .height(40.dp)
      .width(200.dp),
    verticalAlignment = Alignment.CenterVertically,
  ) {
    Text(
      text = "fist",
      modifier = Modifier.weight(3f)
    )
    Text(
      text = "second",
      modifier = Modifier.weight(2f)
    )
    Text(
      text = "third",
      modifier = Modifier.weight(3f)
    )
  }
}

3:2:2 비율로 정렬

text 대신 icon

@Composable
fun RowEx() {
  Row(
    modifier = Modifier
      .height(40.dp)
      .width(200.dp),
    verticalAlignment = Alignment.CenterVertically,
  ) {
    Text(
      text = "fist",
      modifier = Modifier.weight(3f).background(color = Color.Magenta),
      // textAlign = TextAlign.Center // text align 설정도 가능
    )
    Icon(
      imageVector = Icons.Filled.Add,
      contentDescription = "추가",
      modifier = Modifier.weight(1f).background(color = Color.Green)
    )
    Text(
      text = "third",
      modifier = Modifier.weight(3f).background(color = Color.Cyan)
    )
  }
}
<img width="233" alt="스크린샷 2024-01-24 오후 10 56 13" src="https://github.com/Chaebin-Park/Chaebin-Park.github.io/assets/64880435/80f5a9a8-2d9e-498e-961b-6c4ffb15c566">

3:1:2 비율로 정렬

Column

Row 개념과 비슷함.

Default

@Composable
fun ColumnEx() {
  Column(modifier = Modifier.size(100.dp)) {
    Text(text = "first")
    Text(text = "second")
    Text(text = "third")
  }
}

Horizontal alignment

@Composable
fun ColumnEx() {
  Column(
    modifier = Modifier.size(100.dp),
    horizontalAlignment = Alignment.CenterHorizontally
  ) {
    Text(text = "first")
    Text(text = "second")
    Text(text = "third")
  }
}

Vertical arrangement

@Composable
fun ColumnEx() {
  Column(
    modifier = Modifier.size(100.dp),
    horizontalAlignment = Alignment.End, // 여기서는 horizontal vertical 나눠 써야함
    verticalArrangement = Arrangement.SpaceEvenly // 여기서는 그냥 Center (horizontal, vertical)
  ) {
    Text(text = "first")
    Text(text = "second")
    Text(text = "third")
  }
}

개별 text align

@Composable
fun ColumnEx() {
  Column(
    modifier = Modifier.size(100.dp),
    horizontalAlignment = Alignment.End,
    verticalArrangement = Arrangement.SpaceEvenly
  ) {
    Text(
      text = "first",
      modifier = Modifier.align(Alignment.CenterHorizontally)
    )
    Text(text = "second")
    Text(
      text = "third",
      modifier = Modifier.align(Alignment.Start)
    )
  }
}

BoxWithConstraints

Default

@Composable
fun Outer() {
  Column {
    Inner()
  }
}

@Composable
fun Inner() {
  BoxWithConstraints {
    // BoxWithConstaints scope에서는 Box scope에서 추가로
    // constraint, min/max width/height를 알 수 있음
    Text(text = "maxW: $maxWidth maxH: $maxHeight minW: $minWidth minH: $minHeight")
  }
}

Inner 인자로 modifier 전달

@Composable
fun Outer() {
  Column {
    Inner(
      modifier = Modifier
        .widthIn(min = 100.dp, max = 350.dp)
        .heightIn(min = 50.dp, max = 40.dp) // preview 크기에 따라 달라질 수 있으니,
                                            // height, width로 강제 지정해야 할 때가 있음
    )
  }
}

@Composable
fun Inner(modifier: Modifier = Modifier) {
  BoxWithConstraints(modifier) {
    Text(text = "maxW: $maxWidth maxH: $maxHeight minW: $minWidth minH: $minHeight")
  }
}

모든 component는 기본 companion object로 Modifier를 가지고 있음

박채빈

안드로이드 개발자

이전 포스트

Android Study 01

다음 포스트

Compose components 1

AndroidStudy

Text

Default

Color

Color2

Font size

Font weight

Font family

Letter spacing

Max lines

Text decoration

Text align, modifier

Button

Default

Click event toast

Icon 추가

Icon, Text 사이에 Spacer 추가

Enabled 속성

Border stroke

CircleShape

Content Padding

Modifier

Default

Modifier fillMaxSize

Modifier height

Modifier height with width

Modifier size

Background Color

Button Color

Modifier padding

Click 범위 설정

Offset

Surface

Default

Elevation 설정

Border 설정

Shape 설정

Color 설정

Content color를 따로 설정하지 않으면 배경 color에 맞춰 적당한 색으로 바꿔줌.

Box

Default

Text 두 개 배치

두 개의 박스를 박스 안에 배치

부모 박스의 modifier 설정 제거

Row

Default

각 text에 align 설정

Row에 align 설정

Row width 설정

각 text에 weight 설정

text 대신 icon

Column

Default

Horizontal alignment

Vertical arrangement

개별 text align

BoxWithConstraints

Default

Inner 인자로 modifier 전달

Android Study 01

Compose component 2

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