TabRow

Composable Component

Fixed tabs display all tabs in a set simultaneously. They are best for switching between related content quickly, such as between transportation methods in a map. To navigate between fixed tabs, tap an individual tab, or swipe left or right in the content area.

Common

@Composable
fun TabRow(
    selectedTabIndex: Int,
    modifier: Modifier = Modifier,
    backgroundColor: Color = MaterialTheme.colors.primarySurface,
    contentColor: Color = contentColorFor(backgroundColor),
    indicator: @Composable @UiComposable (tabPositions: List<TabPosition>) -> Unit =
        @Composable { tabPositions ->
            TabRowDefaults.Indicator(Modifier.tabIndicatorOffset(tabPositions[selectedTabIndex]))
        },
    divider: @Composable @UiComposable () -> Unit = @Composable { TabRowDefaults.Divider() },
    tabs: @Composable @UiComposable () -> Unit,
)

Parameters


selectedTabIndex	the index of the currently selected tab
modifier	optional `Modifier` for this TabRow
backgroundColor	The background color for the TabRow. Use `Color.Transparent` to have no color.
contentColor	The preferred content color provided by this TabRow to its children. Defaults to either the matching content color for `backgroundColor`, or if `backgroundColor` is not a color from the theme, this will keep the same value set above this TabRow.
indicator	the indicator that represents which tab is currently selected. By default this will be a `TabRowDefaults.Indicator`, using a `TabRowDefaults.tabIndicatorOffset` modifier to animate its position. Note that this indicator will be forced to fill up the entire TabRow, so you should use `TabRowDefaults.tabIndicatorOffset` or similar to animate the actual drawn indicator inside this space, and provide an offset from the start.
divider	the divider displayed at the bottom of the TabRow. This provides a layer of separation between the TabRow and the content displayed underneath.
tabs	the tabs inside this TabRow. Typically this will be multiple `Tab`s. Each element inside this lambda will be measured and placed evenly across the TabRow, each taking up equal space.

Code Examples

TextTabs

@Composable
fun TextTabs() {
    var state by remember { mutableStateOf(0) }
    val titles = listOf("TAB 1", "TAB 2", "TAB 3 WITH LOTS OF TEXT")
    Column {
        TabRow(selectedTabIndex = state) {
            titles.forEachIndexed { index, title ->
                Tab(text = { Text(title) }, selected = state == index, onClick = { state = index })
            }
        }
        Text(
            modifier = Modifier.align(Alignment.CenterHorizontally),
            text = "Text tab ${state + 1} selected",
            style = MaterialTheme.typography.body1,
        )
    }
}

FancyTabs

@Composable
fun FancyTabs() {
    var state by remember { mutableStateOf(0) }
    val titles = listOf("TAB 1", "TAB 2", "TAB 3")
    Column {
        TabRow(selectedTabIndex = state) {
            titles.forEachIndexed { index, title ->
                FancyTab(title = title, onClick = { state = index }, selected = (index == state))
            }
        }
        Text(
            modifier = Modifier.align(Alignment.CenterHorizontally),
            text = "Fancy tab ${state + 1} selected",
            style = MaterialTheme.typography.body1,
        )
    }
}

FancyTab

@Composable
fun FancyTab(title: String, onClick: () -> Unit, selected: Boolean) {
    Tab(selected, onClick) {
        Column(
            Modifier.padding(10.dp).height(50.dp).fillMaxWidth(),
            verticalArrangement = Arrangement.SpaceBetween,
        ) {
            Box(
                Modifier.size(10.dp)
                    .align(Alignment.CenterHorizontally)
                    .background(color = if (selected) Color.Red else Color.White)
            )
            Text(
                text = title,
                style = MaterialTheme.typography.body1,
                modifier = Modifier.align(Alignment.CenterHorizontally),
            )
        }
    }
}

FancyIndicator

@Composable
fun FancyIndicator(color: Color, modifier: Modifier = Modifier) {
    // Draws a rounded rectangular with border around the Tab, with a 5.dp padding from the edges
    // Color is passed in as a parameter [color]
    Box(
        modifier
            .padding(5.dp)
            .fillMaxSize()
            .border(BorderStroke(2.dp, color), RoundedCornerShape(5.dp))
    )
}

FancyIndicatorTabs

@Composable
fun FancyIndicatorTabs() {
    var state by remember { mutableStateOf(0) }
    val titles = listOf("TAB 1", "TAB 2", "TAB 3")
    // Reuse the default offset animation modifier, but use our own indicator
    val indicator =
        @Composable { tabPositions: List<TabPosition> ->
            FancyIndicator(Color.White, Modifier.tabIndicatorOffset(tabPositions[state]))
        }
    Column {
        TabRow(selectedTabIndex = state, indicator = indicator) {
            titles.forEachIndexed { index, title ->
                Tab(text = { Text(title) }, selected = state == index, onClick = { state = index })
            }
        }
        Text(
            modifier = Modifier.align(Alignment.CenterHorizontally),
            text = "Fancy indicator tab ${state + 1} selected",
            style = MaterialTheme.typography.body1,
        )
    }
}

FancyAnimatedIndicator

@Composable
fun FancyAnimatedIndicator(tabPositions: List<TabPosition>, selectedTabIndex: Int) {
    val colors = listOf(Color.Yellow, Color.Red, Color.Green)
    val transition = updateTransition(selectedTabIndex)
    val indicatorStart by
        transition.animateDp(
            transitionSpec = {
                // Handle directionality here, if we are moving to the right, we
                // want the right side of the indicator to move faster, if we are
                // moving to the left, we want the left side to move faster.
                if (initialState < targetState) {
                    spring(dampingRatio = 1f, stiffness = 50f)
                } else {
                    spring(dampingRatio = 1f, stiffness = 1000f)
                }
            }
        ) {
            tabPositions[it].left
        }
    val indicatorEnd by
        transition.animateDp(
            transitionSpec = {
                // Handle directionality here, if we are moving to the right, we
                // want the right side of the indicator to move faster, if we are
                // moving to the left, we want the left side to move faster.
                if (initialState < targetState) {
                    spring(dampingRatio = 1f, stiffness = 1000f)
                } else {
                    spring(dampingRatio = 1f, stiffness = 50f)
                }
            }
        ) {
            tabPositions[it].right
        }
    val indicatorColor by transition.animateColor { colors[it % colors.size] }
    FancyIndicator(
        // Pass the current color to the indicator
        indicatorColor,
        modifier =
            Modifier
                // Fill up the entire TabRow, and place the indicator at the start
                .fillMaxSize()
                .wrapContentSize(align = Alignment.BottomStart)
                // Apply an offset from the start to correctly position the indicator around the tab
                .offset(x = indicatorStart)
                // Make the width of the indicator follow the animated width as we move between tabs
                .width(indicatorEnd - indicatorStart),
    )
}

FancyIndicatorContainerTabs

@Composable
fun FancyIndicatorContainerTabs() {
    var state by remember { mutableStateOf(0) }
    val titles = listOf("TAB 1", "TAB 2", "TAB 3")
    val indicator =
        @Composable { tabPositions: List<TabPosition> ->
            FancyAnimatedIndicator(tabPositions = tabPositions, selectedTabIndex = state)
        }
    Column {
        TabRow(selectedTabIndex = state, indicator = indicator) {
            titles.forEachIndexed { index, title ->
                Tab(text = { Text(title) }, selected = state == index, onClick = { state = index })
            }
        }
        Text(
            modifier = Modifier.align(Alignment.CenterHorizontally),
            text = "Fancy transition tab ${state + 1} selected",
            style = MaterialTheme.typography.body1,
        )
    }
}