SuperDropdown
SuperDropdown 是 Miuix 中的下拉菜单组件,提供了标题、摘要和下拉选项列表,支持点击交互,常用于选项设置和列表选择中。
注意
SuperDropdown 需要在 Scaffold 组件内使用!
引入
kotlin
import top.yukonga.miuix.kmp.extra.SuperDropdown基本用法
SuperDropdown 组件提供了基础的下拉菜单功能:
kotlin
var selectedIndex by remember { mutableStateOf(0) }
val options = listOf("选项 1", "选项 2", "选项 3")
Scaffold {
SuperDropdown(
title = "下拉菜单",
items = options,
selectedIndex = selectedIndex,
onSelectedIndexChange = { selectedIndex = it }
)
}带摘要的下拉菜单
kotlin
var selectedIndex by remember { mutableStateOf(0) }
val options = listOf("中文", "English", "日本語")
Scaffold {
SuperDropdown(
title = "语言设置",
summary = "选择您的首选语言",
items = options,
selectedIndex = selectedIndex,
onSelectedIndexChange = { selectedIndex = it }
)
}组件状态
禁用状态
kotlin
SuperDropdown(
title = "禁用下拉菜单",
summary = "此下拉菜单当前不可用",
items = listOf("选项 1"),
selectedIndex = 0,
onSelectedIndexChange = {},
enabled = false
)属性
SuperDropdown 属性
| 属性名 | 类型 | 说明 | 默认值 | 是否必须 |
|---|---|---|---|---|
| items | List<String> | 下拉选项列表 | - | 是 |
| selectedIndex | Int | 当前选中项的索引 | - | 是 |
| title | String | 下拉菜单的标题 | - | 是 |
| titleColor | BasicComponentColors | 标题文本的颜色配置 | BasicComponentDefaults.titleColor() | 否 |
| summary | String? | 下拉菜单的摘要说明 | null | 否 |
| summaryColor | BasicComponentColors | 摘要文本的颜色配置 | BasicComponentDefaults.summaryColor() | 否 |
| dropdownColors | DropdownColors | 下拉菜单的颜色配置 | DropdownDefaults.dropdownColors() | 否 |
| leftAction | @Composable (() -> Unit)? | 左侧显示的自定义内容 | null | 否 |
| modifier | Modifier | 应用于组件的修饰符 | Modifier | 否 |
| insideMargin | PaddingValues | 组件内部内容的边距 | BasicComponentDefaults.InsideMargin | 否 |
| maxHeight | Dp? | 下拉菜单的最大高度 | null | 否 |
| enabled | Boolean | 组件是否可交互 | true | 否 |
| showValue | Boolean | 是否显示当前选中的值 | true | 否 |
| onClick | (() -> Unit)? | 点击下拉菜单时的额外回调 | null | 否 |
| onSelectedIndexChange | ((Int) -> Unit)? | 选中项变化时的回调 | - | 是 |
DropdownColors 属性
| 属性名 | 类型 | 说明 |
|---|---|---|
| contentColor | Color | 选项文本颜色 |
| containerColor | Color | 选项背景颜色 |
| selectedContentColor | Color | 选中项文本颜色 |
| selectedContainerColor | Color | 选中项背景颜色 |
进阶用法
自定义颜色
kotlin
var selectedIndex by remember { mutableStateOf(0) }
val options = listOf("红色", "绿色", "蓝色")
Scaffold {
SuperDropdown(
title = "自定义颜色",
items = options,
selectedIndex = selectedIndex,
onSelectedIndexChange = { selectedIndex = it },
dropdownColors = DropdownDefaults.dropdownColors(
selectedContentColor = Color.Red,
selectedContainerColor = Color.Red.copy(alpha = 0.2f)
)
)
}限制下拉菜单高度
kotlin
var selectedIndex by remember { mutableStateOf(0) }
val options = List(20) { "选项 ${it + 1}" }
Scaffold {
SuperDropdown(
title = "限制高度",
items = options,
selectedIndex = selectedIndex,
onSelectedIndexChange = { selectedIndex = it },
maxHeight = 200.dp // 限制下拉菜单最大高度为 200dp
)
}隐藏选中值显示
kotlin
var selectedIndex by remember { mutableStateOf(0) }
val options = listOf("选项 1", "选项 2", "选项 3")
Scaffold {
SuperDropdown(
title = "隐藏选中值",
items = options,
selectedIndex = selectedIndex,
onSelectedIndexChange = { selectedIndex = it },
showValue = false // 隐藏选中值显示
)
}结合对话框使用
kotlin
var showDialog = remember { mutableStateOf(false) }
var selectedIndex by remember { mutableStateOf(0) }
val themes = listOf("浅色模式", "深色模式", "跟随系统")
Scaffold {
SuperArrow(
title = "主题设置",
onClick = { showDialog.value = true },
holdDownState = showDialog.value
)
SuperDialog(
title = "主题设置",
show = showDialog,
onDismissRequest = { showDialog.value = false } // 关闭对话框
) {
Card {
SuperDropdown(
title = "主题选择",
summary = "选择您喜欢的主题外观",
items = themes,
selectedIndex = selectedIndex,
onSelectedIndexChange = { selectedIndex = it }
)
}
Row(
horizontalArrangement = Arrangement.SpaceBetween,
modifier = Modifier.padding(top = 12.dp)
) {
TextButton(
text = "取消",
onClick = { showDialog.value = false }, // 关闭对话框
modifier = Modifier.weight(1f)
)
Spacer(Modifier.width(16.dp))
TextButton(
text = "确认",
onClick = { showDialog.value = false }, // 关闭对话框
modifier = Modifier.weight(1f),
colors = ButtonDefaults.textButtonColorsPrimary() // 使用主题颜色
)
}
}
}