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| 1 | +# TopAppBar |
| 2 | + |
| 3 | +`TopAppBar` 是 Miuix 中的顶部应用栏组件,用于在界面顶部提供导航、标题和操作按钮。支持大标题模式和普通模式,以及滚动时的动态效果。 |
| 4 | + |
| 5 | +此组件常常与 `Scaffold` 组件结合使用,以便在应用程序的不同页面中保持一致的布局和行为。 |
| 6 | + |
| 7 | +## 引入 |
| 8 | + |
| 9 | +```kotlin |
| 10 | +import top.yukonga.miuix.kmp.basic.TopAppBar |
| 11 | +import top.yukonga.miuix.kmp.basic.SmallTopAppBar |
| 12 | +import top.yukonga.miuix.kmp.basic.MiuixScrollBehavior |
| 13 | +import top.yukonga.miuix.kmp.basic.rememberTopAppBarState |
| 14 | +``` |
| 15 | + |
| 16 | +## 基本用法 |
| 17 | + |
| 18 | +### 小标题顶部栏 |
| 19 | + |
| 20 | +```kotlin |
| 21 | +SmallTopAppBar( |
| 22 | + title = "标题", |
| 23 | + navigationIcon = { |
| 24 | + IconButton(onClick = { /* 处理点击事件 */ }) { |
| 25 | + Icon(MiuixIcons.Useful.Back, contentDescription = "返回") |
| 26 | + } |
| 27 | + }, |
| 28 | + actions = { |
| 29 | + IconButton(onClick = { /* 处理点击事件 */ }) { |
| 30 | + Icon(MiuixIcons.Useful.More, contentDescription = "更多") |
| 31 | + } |
| 32 | + } |
| 33 | +) |
| 34 | +``` |
| 35 | + |
| 36 | +### 大标题顶部栏 |
| 37 | + |
| 38 | +```kotlin |
| 39 | +TopAppBar( |
| 40 | + title = "标题", |
| 41 | + largeTitle = "大标题", // 如果不指定,将使用 title 的值 |
| 42 | + navigationIcon = { |
| 43 | + IconButton(onClick = { /* 处理点击事件 */ }) { |
| 44 | + Icon(MiuixIcons.Base.ArrowLeft, contentDescription = "返回") |
| 45 | + } |
| 46 | + }, |
| 47 | + actions = { |
| 48 | + IconButton(onClick = { /* 处理点击事件 */ }) { |
| 49 | + Icon(MiuixIcons.Useful.More, contentDescription = "更多") |
| 50 | + } |
| 51 | + } |
| 52 | +) |
| 53 | +``` |
| 54 | + |
| 55 | +## 滚动行为 |
| 56 | + |
| 57 | +TopAppBar 支持随内容滚动时改变其显示状态: |
| 58 | + |
| 59 | +```kotlin |
| 60 | +val scrollBehavior = MiuixScrollBehavior() |
| 61 | +Scaffold( |
| 62 | + topBar = { |
| 63 | + TopAppBar( |
| 64 | + title = "标题", |
| 65 | + largeTitle = "大标题", |
| 66 | + scrollBehavior = scrollBehavior |
| 67 | + ) |
| 68 | + } |
| 69 | +) { paddingValues -> |
| 70 | + LazyColumn( |
| 71 | + modifier = Modifier |
| 72 | + .fillMaxSize() |
| 73 | + .padding(paddingValues), |
| 74 | + contentPadding = PaddingValues(top = paddingValues.calculateTopPadding()), |
| 75 | + topAppBarScrollBehavior = scrollBehavior |
| 76 | + ) { |
| 77 | + // 列表内容 |
| 78 | + } |
| 79 | +} |
| 80 | +``` |
| 81 | + |
| 82 | +## 自定义样式 |
| 83 | + |
| 84 | +### 自定义颜色 |
| 85 | + |
| 86 | +```kotlin |
| 87 | +TopAppBar( |
| 88 | + title = "标题", |
| 89 | + color = MiuixTheme.colorScheme.primary |
| 90 | +) |
| 91 | +``` |
| 92 | + |
| 93 | +### 自定义内容边距 |
| 94 | + |
| 95 | +```kotlin |
| 96 | +TopAppBar( |
| 97 | + title = "标题", |
| 98 | + horizontalPadding = 32.dp |
| 99 | +) |
| 100 | +``` |
| 101 | + |
| 102 | +## 属性 |
| 103 | + |
| 104 | +### TopAppBar 属性 |
| 105 | + |
| 106 | +| 属性名 | 类型 | 默认值 | 说明 | |
| 107 | +| -------------------------- | ------------------------------- | --------------------------------- | ------------------------------ | |
| 108 | +| title | String | - | 顶部栏标题 | |
| 109 | +| modifier | Modifier | Modifier | 应用于顶部栏的修饰符 | |
| 110 | +| color | Color | MiuixTheme.colorScheme.background | 顶部栏背景颜色 | |
| 111 | +| largeTitle | String? | null | 大标题文本,不指定时使用 title | |
| 112 | +| navigationIcon | @Composable () -> Unit | {} | 导航图标区域的可组合函数 | |
| 113 | +| actions | @Composable RowScope.() -> Unit | {} | 操作按钮区域的可组合函数 | |
| 114 | +| scrollBehavior | ScrollBehavior? | null | 控制顶部栏滚动行为 | |
| 115 | +| defaultWindowInsetsPadding | Boolean | true | 是否应用默认窗口边距 | |
| 116 | +| horizontalPadding | Dp | 26.dp | 水平内容边距 | |
| 117 | + |
| 118 | +### SmallTopAppBar 属性 |
| 119 | + |
| 120 | +| 属性名 | 类型 | 默认值 | 说明 | |
| 121 | +| -------------------------- | ------------------------------- | --------------------------------- | ------------------------ | |
| 122 | +| title | String | - | 顶部栏标题 | |
| 123 | +| modifier | Modifier | Modifier | 应用于顶部栏的修饰符 | |
| 124 | +| color | Color | MiuixTheme.colorScheme.background | 顶部栏背景颜色 | |
| 125 | +| navigationIcon | @Composable () -> Unit | {} | 导航图标区域的可组合函数 | |
| 126 | +| actions | @Composable RowScope.() -> Unit | {} | 操作按钮区域的可组合函数 | |
| 127 | +| scrollBehavior | ScrollBehavior? | null | 控制顶部栏滚动行为 | |
| 128 | +| defaultWindowInsetsPadding | Boolean | true | 是否应用默认窗口边距 | |
| 129 | +| horizontalPadding | Dp | 26.dp | 水平内容边距 | |
| 130 | + |
| 131 | +### ScrollBehavior |
| 132 | + |
| 133 | +MiuixScrollBehavior 是用于控制顶部栏滚动行为的配置对象。 |
| 134 | + |
| 135 | +#### rememberTopAppBarState |
| 136 | + |
| 137 | +用于创建和记住 TopAppBarState: |
| 138 | + |
| 139 | +```kotlin |
| 140 | +val scrollBehavior = MiuixScrollBehavior( |
| 141 | + state = rememberTopAppBarState(), |
| 142 | + snapAnimationSpec = spring(stiffness = 3000f), |
| 143 | + canScroll = { true } |
| 144 | +) |
| 145 | +``` |
| 146 | + |
| 147 | +| 参数名 | 类型 | 默认值 | 说明 | |
| 148 | +| ------------------ | --------------------------- | -------------------------- | -------------------------- | |
| 149 | +| state | TopAppBarState | rememberTopAppBarState() | 控制滚动状态的状态对象 | |
| 150 | +| canScroll | () -> Boolean | { true } | 控制是否允许滚动的回调 | |
| 151 | +| snapAnimationSpec | AnimationSpec\<Float>? | spring(stiffness = 3000f) | 定义顶部栏滚动后的吸附动画 | |
| 152 | +| flingAnimationSpec | DecayAnimationSpec\<Float>? | rememberSplineBasedDecay() | 定义顶部栏滑动的衰减动画 | |
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