makepad-platform

name: makepad-platformdescription: |  CRITICAL: Use for Makepad cross-platform support. Triggers on:  makepad platform, makepad os, makepad macos, makepad windows, makepad linux,  makepad android, makepad ios, makepad web, makepad wasm, makepad metal,  makepad d3d11, makepad opengl, makepad webgl, OsType, CxOs,  makepad 跨平台, makepad 平台支持risk: criticalsource: communitydate_added: "2026-03-06"

Supporting material availability

This catalog copy contains the inline guidance below, but does not include the following supporting paths. They are external prerequisites, not bundled files:

• ./references/platform-support.md

Ask for the original supporting material or an existing installation before using a step that depends on these paths; this catalog does not identify a verified download source for them. Resolve each path relative to that installation, inspect its contents, and verify any applicable license and execution prerequisites. Do not run a command or claim a referenced procedure was followed until its required file exists. Do not fabricate the missing scripts or treat an unrelated file with the same name as equivalent. Independent steps fully documented here can proceed within the user’s authorized scope; report any dependent step as unavailable.

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

When to Use

• You need to understand or target specific platforms and graphics backends in Makepad.
• The task involves platform compatibility, conditional compilation, or OS-specific behavior across desktop, mobile, or web.
• You need guidance on backend differences such as Metal, D3D11, OpenGL, WebGL, or platform modules.

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:
   • Report the missing reference; /sync-crate-skills is not bundled and must not be invented or run with --force as an automatic fallback.
   • Still answer based on SKILL.md patterns + built-in knowledge
3. If reference file exists, incorporate its content into the answer

Supported Platforms

OsType Enum

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 */ }
        _ => {}
    }
}

The enum/platform table and API declarations are historical dev-branch illustrations. Pin a commit/crate version and inspect its actual declarations; the semicolon-only impl signatures below are an API sketch, not compilable Rust.

Platform Detection

// 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

// 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

// 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. Shader compilation timing and supported backends depend on the pinned Makepad revision; inspect that backend implementation rather than assuming all shaders compile at build time
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

Limitations

• Use this skill only when the task clearly matches the scope described above.
• Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
• Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.