winit-sonoma-fix/examples/window_option_as_alt.rs

#![allow(clippy::single_match)]

#[cfg(target_os = "macos")]
use winit::platform::macos::{OptionAsAlt, WindowExtMacOS};

#[cfg(target_os = "macos")]
use winit::{
    event::ElementState,
    event::{Event, MouseButton, WindowEvent},
    event_loop::EventLoop,
    window::WindowBuilder,
};

#[cfg(target_os = "macos")]
#[path = "util/fill.rs"]
mod fill;

/// Prints the keyboard events characters received when option_is_alt is true versus false.
/// A left mouse click will toggle option_is_alt.
#[cfg(target_os = "macos")]
fn main() -> Result<(), impl std::error::Error> {
    let event_loop = EventLoop::new();

    let window = WindowBuilder::new()
        .with_title("A fantastic window!")
        .with_inner_size(winit::dpi::LogicalSize::new(128.0, 128.0))
        .build(&event_loop)
        .unwrap();

    window.set_ime_allowed(true);

    let mut option_as_alt = window.option_as_alt();

    event_loop.run(move |event, _, control_flow| {
        control_flow.set_wait();

        match event {
            Event::WindowEvent {
                event: WindowEvent::CloseRequested,
                window_id,
            } if window_id == window.id() => control_flow.set_exit(),
            Event::WindowEvent { event, .. } => match event {
                WindowEvent::MouseInput {
                    state: ElementState::Pressed,
                    button: MouseButton::Left,
                    ..
                } => {
                    option_as_alt = match option_as_alt {
                        OptionAsAlt::None => OptionAsAlt::OnlyLeft,
                        OptionAsAlt::OnlyLeft => OptionAsAlt::OnlyRight,
                        OptionAsAlt::OnlyRight => OptionAsAlt::Both,
                        OptionAsAlt::Both => OptionAsAlt::None,
                    };

                    println!("Received Mouse click, toggling option_as_alt to: {option_as_alt:?}");
                    window.set_option_as_alt(option_as_alt);
                }
                WindowEvent::KeyboardInput { .. } => println!("KeyboardInput: {event:?}"),
                _ => (),
            },
            Event::AboutToWait => {
                window.request_redraw();
            }
            Event::RedrawRequested(_) => {
                fill::fill_window(&window);
            }
            _ => (),
        }
    })
}

#[cfg(not(target_os = "macos"))]
fn main() {
    println!("This example is only supported on MacOS");
}