Jetpack Compose 减少选项卡的内部填充

Question

我想减少单个选项卡的填充。下图显示了我想要的：

我得到了什么：

我目前正在使用版本为 0.16.0 的“accompanist-pager”和“accompanist-pager-indicators”。

代码：

@Composable
fun Tabs(tabNames: List<String>, pagerState: PagerState, scrollToPage: (Int) -> Unit) {
  TabRow(
    selectedTabIndex = pagerState.currentPage,
    backgroundColor = Color.White,
    contentColor = Color.Black,
    divider = {
      TabRowDefaults.Divider(
        thickness = 4.dp
      )
    },
    indicator = { tabPositions ->
      TabRowDefaults.Indicator(
        modifier = Modifier.customTabIndicatorOffset(tabPositions[pagerState.currentPage]),
        height = 4.dp,
        color = EmeraldTheme.colors.primary
      )
    }
  ) {
    tabNames.forEachIndexed { index, name ->
      Tab(
        text = {
          Text(
            text = name,
            maxLines = 1,
            style = globalSearchDefaultTextStyle,
            fontWeight = if (pagerState.currentPage == index) FontWeight.Bold else FontWeight.Normal,
            color = if (pagerState.currentPage == index) EmeraldColor.Black100 else colorResource(globalSearchR.color.darkGrey20),
          )
        },
        selected = pagerState.currentPage == index,
        onClick = {
          scrollToPage(index)
        }
      )
    }
    Row { Spacer(Modifier.weight(1f, true)) }
  }
}

Answer 1

使用当前版本的 TabRow（或 ScrollableTabRow）您将无法执行此操作。您需要创建自己的 TabRow 可组合项。

此外，您可能应该使用 ScrollableTabRow 而不是 TabRow，因为 TabRow 会为其 Tabs 均匀分配整个可用的 width。因此内容填充并不重要。

您几乎可以复制粘贴 ScrollableTabRow 的整个代码，但要修改设置 tabConstraints.[=22= 的位]

不应再使用 minTabWidth:

val minTabWidth = ScrollableTabRowMinimumTabWidth.roundToPx()

Answer 2

自定义选项卡是正确的选择。

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.size
import androidx.compose.material.Tab
import androidx.compose.material.Text

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)
        )
    }
}

https://developer.android.com/reference/kotlin/androidx/compose/material/package-summary#Tab(kotlin.Boolean,kotlin.Function0,androidx.compose.ui.Modifier,kotlin.Boolean,androidx.compose.foundation.interaction.MutableInteractionSource,androidx.compose.ui.graphics.Color,androidx.compose.ui.graphics.Color,kotlin.Function1)

Jetpack Compose 减少选项卡的内部填充

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