slint-baseview

A baseview backend for Slint - run a Slint UI inside a baseview window.

This is most useful for audio plugin editors, where the GUI has to live inside a window the host provides. It's the Slint counterpart to egui-baseview and iced_baseview: a generic windowing/rendering layer with no plugin-framework dependency. Framework integrations (e.g. nice-plug-slint) build on top of it.

What it does

• Owns a baseview window and its render loop.
• Sets up an OpenGL + FemtoVG renderer and a custom Slint Platform/WindowAdapter.
• Translates baseview mouse, keyboard, and resize events into Slint events.
• Drives your component each frame via a setup (once) and update (per-frame) closure.

Usage

useslint_baseview::{SlintWindow,WindowOpenOptions,WindowScalePolicy,Size,default_gl_config};letoptions=WindowOpenOptions{title: "My Plugin".into(),size: Size::new(400.0,300.0),scale: WindowScalePolicy::SystemScaleFactor,gl_config: Some(default_gl_config()),// FemtoVG needs an OpenGL context
};let_handle=SlintWindow::open_parented(&parent,// anything implementing raw-window-handle 0.5's HasRawWindowHandle
options,||MyComponent::new(),// component factory
|_handler,_window|{// setup: runs once after the component is shown
// register Slint callbacks here
},|handler,_window|{// update: runs every frame
handler.component().set_value(42.0);},|_w,_h|{},// on_resize: notified when the window size changes
);

For a standalone window (no plugin host) — handy for examples and testing — use SlintWindow::open_blocking(options, factory, setup, update, on_resize), which opens a top-level window and blocks until it closes. See the runnable example:

cargo run --example counter

Inside the closures, the SlintWindowHandler gives you component(), window() (the Slint window), scale_factor(), and resize control (resize, queue_resize for use from Slint callbacks).

A couple of things worth knowing

• Two raw-window-handle versions. Slint uses rwh 0.6 internally, but baseview 0.1.x's open_parented takes rwh 0.5's HasRawWindowHandle. open_parented's parent is bound by the 0.5 trait (re-exported as slint_baseview::HasRawWindowHandle). If your parent handle comes from a framework using a different rwh version, wrap it in a small adapter type that implements the 0.5 trait (this is what nice-plug-slint does).
• keyboard-types is pinned to 0.6 to match what baseview's KeyboardEvent uses; bumping it independently produces type mismatches.
• Slint is pinned to =1.16.1 with the renderer-femtovg, raw-window-handle-06, and compat-1-2 features.

Status

Extracted from the nice-plug-slint adapter and generalized. Works on Windows (developed there); macOS/Linux use the same baseview paths but want testing.

License

ISC.