makepad-platform - Claude MCP Skill

# Makepad Platform Skill

> **Version:** makepad-widgets (dev branch) | **Last Updated:** 2026-01-19
>
> Check for updates: https://crates.io/crates/makepad-widgets

You are an expert at Makepad cross-platform development. Help users by:
- **Understanding platforms**: Explain supported platforms and backends
- **Platform-specific code**: Help with conditional compilation and platform APIs

## Documentation

Refer to the local files for detailed documentation:
- `./references/platform-support.md` - Platform details and OsType

## IMPORTANT: Documentation Completeness Check

**Before answering questions, Claude MUST:**

1. Read the relevant reference file(s) listed above
2. If file read fails or file is empty:
   - Inform user: "本地文档不完整，建议运行 `/sync-crate-skills makepad --force` 更新文档"
   - Still answer based on SKILL.md patterns + built-in knowledge
3. If reference file exists, incorporate its content into the answer

## Supported Platforms

| Platform | Graphics Backend | OS Module |
|----------|------------------|-----------|
| macOS | Metal | `apple/metal_*.rs`, `apple/cocoa_*.rs` |
| iOS | Metal | `apple/metal_*.rs`, `apple/ios_*.rs` |
| Windows | D3D11 | `mswindows/d3d11_*.rs`, `mswindows/win32_*.rs` |
| Linux | OpenGL | `linux/opengl_*.rs`, `linux/x11*.rs`, `linux/wayland*.rs` |
| Web | WebGL2 | `web/*.rs`, `web_browser/*.rs` |
| Android | OpenGL ES | `android/*.rs` |
| OpenHarmony | OHOS | `open_harmony/*.rs` |
| OpenXR | VR/AR | `open_xr/*.rs` |

## OsType Enum

```rust
pub enum OsType {
    Unknown,
    Windows,
    Macos,
    Linux { custom_window_chrome: bool },
    Ios,
    Android(AndroidParams),
    OpenHarmony,
    Web(WebParams),
    OpenXR,
}

// Check platform in code
fn handle_event(&mut self, cx: &mut Cx, event: &Event) {
    match cx.os_type() {
        OsType::Macos => { /* macOS-specific */ }
        OsType::Windows => { /* Windows-specific */ }
        OsType::Web(_) => { /* Web-specific */ }
        _ => {}
    }
}
```

## Platform Detection

```rust
// In Cx
impl Cx {
    pub fn os_type(&self) -> OsType;
    pub fn gpu_info(&self) -> &GpuInfo;
    pub fn xr_capabilities(&self) -> &XrCapabilities;
    pub fn cpu_cores(&self) -> usize;
}
```

## Conditional Compilation

```rust
// Compile-time platform detection
#[cfg(target_os = "macos")]
fn macos_only() { }

#[cfg(target_os = "windows")]
fn windows_only() { }

#[cfg(target_os = "linux")]
fn linux_only() { }

#[cfg(target_arch = "wasm32")]
fn web_only() { }

#[cfg(target_os = "android")]
fn android_only() { }

#[cfg(target_os = "ios")]
fn ios_only() { }
```

## Platform-Specific Features

### Desktop (macOS/Windows/Linux)
- Window management (resize, minimize, maximize)
- File dialogs
- System menu
- Drag and drop
- Multiple monitors

### Mobile (iOS/Android)
- Touch input
- Virtual keyboard
- Screen orientation
- App lifecycle (foreground/background)

### Web (WebGL2)
- DOM integration
- Browser events
- Local storage
- HTTP requests

## Entry Point

```rust
// App entry macro
app_main!(App);

pub struct App {
    ui: WidgetRef,
}

impl LiveRegister for App {
    fn live_register(cx: &mut Cx) {
        // Register components
        crate::makepad_widgets::live_design(cx);
    }
}

impl AppMain for App {
    fn handle_event(&mut self, cx: &mut Cx, event: &Event) {
        // Handle app events
        self.ui.handle_event(cx, event, &mut Scope::empty());
    }
}
```

## When Answering Questions

1. Makepad compiles to native code for each platform (no runtime interpreter)
2. Shaders are compiled at build time for each graphics backend
3. Platform-specific code is in `platform/src/os/` directory
4. Use `cx.os_type()` for runtime platform detection
5. Use `#[cfg(target_os = "...")]` for compile-time platform detection