truesheet-usage

What this skill does

# TrueSheet Consumer Guide

Use this skill to produce correct, idiomatic code for apps that consume `@lodev09/react-native-true-sheet`. It covers choosing the right integration pattern, applying the public API correctly, and avoiding platform-specific pitfalls.

## Quick Start

The simplest sheet: a ref, a button, and some content.

```tsx
import { useRef } from 'react'
import { Button, Text, View } from 'react-native'
import { TrueSheet } from '@lodev09/react-native-true-sheet'

export function App() {
  const sheet = useRef<TrueSheet>(null)

  return (
    <View>
      <Button title="Open" onPress={() => sheet.current?.present()} />
      <TrueSheet ref={sheet} detents={['auto']} cornerRadius={24} grabber>
        <View style={{ padding: 16 }}>
          <Text>Hello from the sheet</Text>
          <Button title="Close" onPress={() => sheet.current?.dismiss()} />
        </View>
      </TrueSheet>
    </View>
  )
}
```

## Choose the Right Control Pattern

Pick one based on where the trigger lives relative to the sheet and which platforms you target.

| Pattern | When to use | Platform |
|---------|------------|----------|
| **Ref** | Trigger and sheet in the same component | All |
| **Named + global methods** | Trigger is far from the sheet (different screen, deep in tree) | Native only |
| **`TrueSheetProvider` + `useTrueSheet()`** | Web support needed, or you want hook-based control | All (required on web) |
| **`createTrueSheetNavigator()`** | Sheets are part of a navigation flow | All |
| **`ReanimatedTrueSheet`** | You need animated values synced to sheet position | All |

### Ref-based

Already shown in Quick Start. Use `present()`, `dismiss()`, `resize(index)` on the ref.

### Named sheet with global methods (native only)

When the trigger is far from where the sheet renders:

```tsx
// Somewhere in the tree
<TrueSheet name="profile" detents={['auto', 1]}>
  <ProfileContent />
</TrueSheet>

// Anywhere else (native only)
await TrueSheet.present('profile')
await TrueSheet.dismiss('profile')
await TrueSheet.resize('profile', 1)
await TrueSheet.dismissAll()
```

Every `name` must be unique. Static methods don't exist on web — use the provider pattern instead.

### Web control with provider

Wrap your app with `TrueSheetProvider` (on native this is a pass-through with zero overhead):

```tsx
import { TrueSheet, TrueSheetProvider, useTrueSheet } from '@lodev09/react-native-true-sheet'

function Toolbar() {
  const { present, dismiss } = useTrueSheet()
  return <Button title="Open" onPress={() => present('settings')} />
}

export function App() {
  return (
    <TrueSheetProvider>
      <Toolbar />
      <TrueSheet name="settings" detents={[0.5, 1]}>
        <SettingsContent />
      </TrueSheet>
    </TrueSheetProvider>
  )
}
```

### Navigation (React Navigation / Expo Router)

See [advanced patterns reference](./references/advanced-patterns.md#react-navigation) for full setup with `createTrueSheetNavigator`, Expo Router layouts, screen options, and `useTrueSheetNavigation`.

### Reanimated

See [advanced patterns reference](./references/advanced-patterns.md#reanimated) for `ReanimatedTrueSheet`, `ReanimatedTrueSheetProvider`, and animated values (`animatedPosition`, `animatedIndex`, `animatedDetent`).

## Detents

Detents define the heights the sheet can snap to. You get up to **3 detents**, sorted smallest to largest.

| Value | Meaning |
|-------|---------|
| `'auto'` | Size to fit the content (iOS 16+, Android, Web) |
| `0` – `1` | Fraction of the screen height |

```tsx
// Content-sized sheet
<TrueSheet detents={['auto']} />

// Half and full screen
<TrueSheet detents={[0.5, 1]} />

// Three stops: peek, half, full
<TrueSheet detents={[0.25, 0.5, 1]} />
```

**The one rule you can't break:** never combine `'auto'` with `scrollable`. Auto-sizing needs to measure the full content, but a scrollable sheet clips it — they're fundamentally incompatible. Use fractional detents for scrollable sheets.

## Common Recipes

### Scrollable content

```tsx
<TrueSheet detents={[0.5, 1]} scrollable cornerRadius={24} grabber>
  <ScrollView>
    {items.map(item => <ItemRow key={item.id} item={item} />)}
  </ScrollView>
</TrueSheet>
```

- The `scrollable` prop auto-detects ScrollView/FlatList up to 2 levels deep
- On iOS, scrolling to top expands to next detent — disable with `scrollableOptions={{ scrollingExpandsSheet: false }}`
- On Android, nested scrolling is handled automatically

### Fixed header and footer

```tsx
<TrueSheet
  detents={[0.5, 1]}
  scrollable
  header={
    <View style={{ padding: 16 }}>
      <Text style={{ fontSize: 18, fontWeight: 'bold' }}>Title</Text>
    </View>
  }
  footer={<BottomActions />}
>
  <ScrollView>{/* ... */}</ScrollView>
</TrueSheet>
```

Use the `header` and `footer` props — they render in native container views, so the layout math is handled for you. Don't fake it with absolute positioning.

### Non-dismissible confirmation

```tsx
<TrueSheet
  ref={sheet}
  detents={['auto']}
  dismissible={false}
  draggable={false}
  dimmed
  grabber={false}
>
  <View style={{ padding: 24 }}>
    <Text>Are you sure?</Text>
    <Button title="Confirm" onPress={handleConfirm} />
    <Button title="Cancel" onPress={() => sheet.current?.dismiss()} />
  </View>
</TrueSheet>
```

### iOS blur background

```tsx
<TrueSheet detents={['auto']} backgroundBlur="system-material">
  <View style={{ padding: 16 }}>
    <Text>Blurred sheet</Text>
  </View>
</TrueSheet>
```

Fine-tune with `blurOptions={{ intensity: 80, interaction: true }}`. Blur is iOS-only.

### Present on mount

```tsx
<TrueSheet detents={['auto', 1]} initialDetentIndex={0} initialDetentAnimated>
  <WelcomeContent />
</TrueSheet>
```

### Dimming control

```tsx
// No dimming (allows background interaction)
<TrueSheet dimmed={false} detents={['auto']} />

// Dim only above a certain detent
<TrueSheet detents={['auto', 0.7, 1]} dimmedDetentIndex={1} />
```

### Resize programmatically

`resize()` takes a **detent index**, not a value:

```tsx
const sheet = useRef<TrueSheet>(null)

// detents={[0.3, 0.6, 1]}
await sheet.current?.resize(2) // expands to full (index 2)
```

## Rules That Save Debugging Time

1. **Max 3 detents**, sorted smallest → largest.
2. **Never `'auto'` + `scrollable`** — they're incompatible.
3. **`resize()` takes an index**, not a fraction. `resize(1)` means "go to the second detent."
4. **Sheet names must be unique** across your entire app.
5. **Static methods are native-only** — use `useTrueSheet()` on web.
6. **Don't use `autoFocus` on TextInputs** inside sheets. Focus in `onDidPresent` instead:
   ```tsx
   <TrueSheet onDidPresent={() => inputRef.current?.focus()}>
   ```
7. **Use `flexGrow: 1`** (not `flex: 1`) inside `GestureHandlerRootView` on Android.
8. **Dismiss sheets before closing Modals** on iOS — React Native has a bug where dismissing a Modal while a sheet is visible causes a blank screen.
9. **Use `header`/`footer` props** for fixed chrome — don't reach for absolute positioning.
10. **Liquid Glass** is automatic on iOS 26+. Set `backgroundColor` to disable it per-sheet, or add `UIDesignRequiresCompatibility` to Info.plist to disable app-wide.

## Platform Differences at a Glance

| Feature | iOS | Android | Web |
|---------|-----|---------|-----|
| `'auto'` detent | iOS 16+ | Yes | Yes |
| `backgroundBlur` | Yes | No | No |
| Liquid Glass | iOS 26+ | No | No |
| Static global methods | Yes | Yes | No (use provider) |
| `scrollable` | Yes | Yes | No |
| `anchor` / side sheets | System-controlled margins | `anchorOffset` prop | `anchorOffset` prop |
| `presentation` | iOS 17+ (iPad) | N/A | Landscape/tablet |
| `detached` mode | No | No | Yes |
| Edge-to-edge | N/A | Auto-detected | N/A |
| Keyboard handling | Built-in | Built-in | N/A |

## Events

The most commonly used events:

| Event | When it fires | Payload |
|-------|--------------|---------|
| `onMount` | Content is mounted and ready | — |
| `onDidPresent` | Sheet finished pre