fission-shell-winit

Architecture

WinitApp<S, W>
  |
  +-- Runtime         (fission-core: state management, action dispatch, animation ticking)
  +-- LayoutEngine    (fission-layout: flexbox layout computation)
  +-- Pipeline        (IR diffing, layout, paint, display list generation)
  +-- VelloRenderer   (fission-render-vello: GPU rasterization via Vello + wgpu)
  +-- VelloTextMeasurer (font context, text shaping via Parley + Fontique)
  +-- DesktopClipboard (or in-memory clipboard fallback on mobile)
  +-- DesktopImeHandler (IME composition via winit)
  +-- VideoBackend    (macOS AVFoundation video, or mock on other platforms)
  +-- TestControl     (optional HTTP server for automated UI testing)

WinitApp

Construction

use fission_shell_winit::WinitApp;

WinitApp::new(MyRootWidget)
    .with_title("My App")
    .with_state_init(|state| {
        state.counter = 42;
    })
    .with_startup_action(AppStarted)
    .with_async(|asyncs| {
        asyncs.register_job(FETCH_JOB, fetch_job_handler);
    })
    .with_key_handler(|state, key, mods| {
        // Return true if handled, false to pass to framework
        false
    })
    .with_sync_env(|state, env| {
        env.theme = if state.dark_mode { Theme::dark() } else { Theme::default() };
    })
    .with_frame_hook(|state| {
        // Runs on every AboutToWait event.
        // Keep this for synchronous polling or platform wakeups only.
        // Return true to request a redraw.
        false
    })
    .with_async(|asyncs| {
        asyncs.register_operation_capability(MY_CAPABILITY, |request, _ctx| async move {
            Ok(MyCapabilityOk::default())
        });
    })
    .run()
    .unwrap();

Builder methods

Frame cycle

Pipeline

Key fields

Environment variables

Test control

Platform support