← Compose Multiplatform Component in Compose Foundation Layout
Row
A layout composable that places its children in a horizontal sequence. For a layout composable that places its children in a vertical sequence, see [Column]. Note that by default items do not scroll; see Modifier.horizontalScroll to add this behavior. For a horizontally scrollable list that only composes and lays out the currently visible items see LazyRow.
The [Row] layout is able to assign children widths according to their weights provided using the [RowScope.weight] modifier. If a child is not provided a weight, it will be asked for its preferred width before the sizes of the children with weights are calculated proportionally to their weight based on the remaining available space. Note that if the [Row] is horizontally scrollable or part of a horizontally scrollable container, any provided weights will be disregarded as the remaining available space will be infinite.
When none of its children have weights, a [Row] will be as small as possible to fit its children one next to the other. In order to change the width of the [Row], use the [Modifier.width] modifiers; e.g. to make it fill the available width [Modifier.fillMaxWidth] can be used. If at least one child of a [Row] has a [weight][RowScope.weight], the [Row] will fill the available width, so there is no need for [Modifier.fillMaxWidth]. However, if [Row]'s size should be limited, the [Modifier.width] or [Modifier.size] layout modifiers should be applied.
When the size of the [Row] is larger than the sum of its children sizes, a [horizontalArrangement] can be specified to define the positioning of the children inside the [Row]. See [Arrangement] for available positioning behaviors; a custom arrangement can also be defined using the constructor of [Arrangement]. Below is an illustration of different horizontal arrangements:
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Installation
dependencies {
implementation("androidx.compose.foundation:foundation-layout:1.7.0-beta04")
}
Overloads
@Composable
fun Row(
modifier: Modifier = Modifier,
horizontalArrangement: Arrangement.Horizontal = Arrangement.Start,
verticalAlignment: Alignment.Vertical = Alignment.Top,
content: @Composable RowScope.() -> Unit
)
Parameters
| name | description |
|---|---|
modifier | The modifier to be applied to the Row. |
horizontalArrangement | The horizontal arrangement of the layout's children. |
verticalAlignment | The vertical alignment of the layout's children. |
Code Examples
SimpleRow
@Composable
@Sampled
fun SimpleRow() {
Row {
// The child with no weight will have the specified size.
Box(Modifier.size(40.dp, 80.dp).background(Color.Magenta))
// Has weight, the child will occupy half of the remaining width.
Box(Modifier.height(40.dp).weight(1f).background(Color.Yellow))
// Has weight and does not fill, the child will occupy at most half of the remaining width.
// Therefore it will occupy 80.dp (its preferred width) if the assigned width is larger.
Box(
Modifier.size(80.dp, 40.dp)
.weight(1f, fill = false)
.background(Color.Green)
)
}
}
SimpleAlignByInRow
@Composable
@Sampled
fun SimpleAlignByInRow() {
Row(Modifier.fillMaxHeight()) {
// The center of the magenta Box and the baselines of the two texts will be
// vertically aligned. Note that alignBy() or alignByBaseline() has to be specified
// for all children we want to take part in the alignment. For example, alignByBaseline()
// means that the baseline of the text should be aligned with the alignment line
// (possibly another baseline) specified for siblings using alignBy or alignByBaseline.
// If no other sibling had alignBy() or alignByBaseline(), the modifier would have no
// effect.
Box(
modifier = Modifier.size(80.dp, 40.dp)
.alignBy { it.measuredHeight / 2 }
.background(Color.Magenta)
)
Text(
text = "Text 1",
fontSize = 40.sp,
modifier = Modifier.alignByBaseline().background(color = Color.Red)
)
Text(
text = "Text 2",
modifier = Modifier.alignByBaseline().background(color = Color.Cyan)
)
}
}
