# Head Components

> Header and menu navigation components.

---

## Overview

Head components provide the top-level navigation and layout structure for the management UI. They handle menu rendering, user controls, and responsive layout adjustments.

---

## Components

| Component | File | Purpose |
|-----------|------|---------|
| Head | `head/head.vue` | Main header with logo, title, user info |
| MenuTree | `head/menu-tree.vue` | Menu navigation with router integration |
| Personal | `head/personal.vue` | Personal settings panel |
| Fullscreen | `head/fullscreen.vue` | Fullscreen toggle button |
| StyleChange | `head/style-change.vue` | Theme/style switcher |
| LangChange | `head/lang-change.vue` | Language switcher |
| SizeChange | `head/size-change.vue` | UI size (small/medium/large) switcher |

---

## Head Component (`head.vue`)

Main header wrapper with slots for left/right content.

### Props

| Prop | Type | Default | Description |
|------|------|---------|-------------|
| `closeAble` | Boolean | false | Show/hide aside toggle |
| `title` | String | null | Custom title text |
| `logo` | String | null | Logo image URL |
| `username` | String | null | Display username |

### Slots

| Slot | Description |
|------|-------------|
| `left` | Left side content before actions |
| `default` | Right side content (actions) |

### Behavior

- `closeAble` toggles aside width between `0px` and original width
- Uses Vuex `state.size` for responsive sizing with CSS `v-bind`

### Example

```vue
<NoobHead :closeAble="true" :title="appTitle" :logo="logo" :username="username">
    <Fullscreen />
    <StyleChange />
    <LangChange />
    <SizeChange />
    <Personal />
</NoobHead>
```

---

## MenuTree Component (`menu-tree.vue`)

Dynamic menu navigation with router integration.

### Props

| Prop | Type | Default | Description |
|------|------|---------|-------------|
| `mode` | String | 'vertical' | Menu mode ('vertical' or 'horizontal') |
| `data` | Array | null | Menu items (uses Vuex if null) |
| `logo` | String | null | Logo image URL |
| `title` | String | null | Title text |

### Menu Data Structure

```typescript
interface MenuItem {
    path: string;           // Route path
    title?: string;         // Display title
    i18n?: string;          // i18n key for title
    icon?: string;          // Icon component name
    children?: MenuItem[];  // Sub-menu items
}
```

### Menu Definition (views/index.ts)

```typescript
const menus = {
    buff: { i18n: 'preMenu.operator.0', path: 'buffer', icon: 'Warning' },
    config: { i18n: 'preMenu.operator.1', path: 'config', icon: 'EditPen' },
    dictionary: { i18n: 'preMenu.operator.2', path: 'dictionary', icon: 'Collection' },
    permission: { i18n: 'preMenu.operator.3', path: 'permission', icon: 'Unlock' },
    role: { i18n: 'preMenu.operator.4', path: 'role', icon: 'User' },
    user: { i18n: 'preMenu.operator.5', path: 'user', icon: 'User' },
    status: { i18n: 'preMenu.operator.6', path: 'status', icon: 'Setting' },
    log: { i18n: 'preMenu.operator.7', path: 'log', icon: 'Document' },
};
```

### Behavior

- Reads active route from `router.currentRoute.value.path`
- Prefixes paths with `/` if not present
- Uses `el-menu` with `router` prop for automatic routing
- Supports nested menus via `el-sub-menu`

### Style Integration

Uses Vuex state for dynamic theming:

```scss
.el-menu {
    :background-color: v-bind('state.style.menuBg');
    :text-color: v-bind('state.style.menuColor');
    :active-text-color: v-bind('state.style.menuActiveColor');
}
```

---

## Fullscreen Component (`fullscreen.vue`)

Toggle browser fullscreen mode.

### Implementation

```typescript
import { ref } from 'vue';

const isFullscreen = ref(false);

const toggle = () => {
    if (!document.fullscreenElement) {
        document.documentElement.requestFullscreen();
        isFullscreen.value = true;
    } else {
        document.exitFullscreen();
        isFullscreen.value = false;
    }
};
```

---

## StyleChange Component (`style-change.vue`)

Theme/style switcher - typically opens a style configuration panel.

---

## LangChange Component (`lang-change.vue`)

Language switcher - switches i18n locale.

---

## SizeChange Component (`size-change.vue`)

UI component size switcher (small/medium/large/default).

### Integration

Updates Vuex `state.size.size` which propagates to all Element Plus components.

---

## Common Patterns

### Vuex State Usage

```typescript
const { state, commit, dispatch } = useStore();

// Accessing size settings
state.size.headHeight
state.size.asideWidth
state.size.size

// Accessing style settings
state.style.menuBg
state.style.menuColor
state.style.menuActiveColor
```

### CSS Dynamic Bindings

```scss
height: v-bind('state.size.headHeight');
width: v-bind('state.size.asideWidth');
font-size: v-bind('state.size.fontSize');
```

---

## Anti-Patterns

1. **Do not directly mutate `state.size`** - Use `commit("initSize")` after changes
2. **Do not hardcode pixel values** - Use Vuex state for responsive design
3. **Do not skip path prefix check** - Always ensure paths start with `/`