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winit 0.29.9

Cross-platform window creation library.
Documentation 
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#[cfg(all(
    feature = "rwh_06",
    any(x11_platform, macos_platform, windows_platform)
))]
#[path = "util/fill.rs"]
mod fill;

#[cfg(all(
    feature = "rwh_06",
    any(x11_platform, macos_platform, windows_platform)
))]
#[allow(deprecated)]
fn main() -> Result<(), impl std::error::Error> {
    use std::collections::HashMap;

    use winit::{
        dpi::{LogicalPosition, LogicalSize, Position},
        event::{ElementState, Event, KeyEvent, WindowEvent},
        event_loop::{EventLoop, EventLoopWindowTarget},
        raw_window_handle::HasRawWindowHandle,
        window::{Window, WindowBuilder, WindowId},
    };

    fn spawn_child_window(
        parent: &Window,
        event_loop: &EventLoopWindowTarget<()>,
        windows: &mut HashMap<WindowId, Window>,
    ) {
        let parent = parent.raw_window_handle().unwrap();
        let mut builder = WindowBuilder::new()
            .with_title("child window")
            .with_inner_size(LogicalSize::new(200.0f32, 200.0f32))
            .with_position(Position::Logical(LogicalPosition::new(0.0, 0.0)))
            .with_visible(true);
        // `with_parent_window` is unsafe. Parent window must be a valid window.
        builder = unsafe { builder.with_parent_window(Some(parent)) };
        let child_window = builder.build(event_loop).unwrap();

        let id = child_window.id();
        windows.insert(id, child_window);
        println!("child window created with id: {id:?}");
    }

    let mut windows = HashMap::new();

    let event_loop: EventLoop<()> = EventLoop::new().unwrap();
    let parent_window = WindowBuilder::new()
        .with_title("parent window")
        .with_position(Position::Logical(LogicalPosition::new(0.0, 0.0)))
        .with_inner_size(LogicalSize::new(640.0f32, 480.0f32))
        .build(&event_loop)
        .unwrap();

    println!("parent window: {parent_window:?})");

    event_loop.run(move |event: Event<()>, elwt| {
        if let Event::WindowEvent { event, window_id } = event {
            match event {
                WindowEvent::CloseRequested => {
                    windows.clear();
                    elwt.exit();
                }
                WindowEvent::CursorEntered { device_id: _ } => {
                    // On x11, println when the cursor entered in a window even if the child window is created
                    // by some key inputs.
                    // the child windows are always placed at (0, 0) with size (200, 200) in the parent window,
                    // so we also can see this log when we move the cursor arround (200, 200) in parent window.
                    println!("cursor entered in the window {window_id:?}");
                }
                WindowEvent::KeyboardInput {
                    event:
                        KeyEvent {
                            state: ElementState::Pressed,
                            ..
                        },
                    ..
                } => {
                    spawn_child_window(&parent_window, elwt, &mut windows);
                }
                WindowEvent::RedrawRequested => {
                    if let Some(window) = windows.get(&window_id) {
                        fill::fill_window(window);
                    }
                }
                _ => (),
            }
        }
    })
}

#[cfg(not(all(
    feature = "rwh_06",
    any(x11_platform, macos_platform, windows_platform)
)))]
fn main() {
    panic!("This example is supported only on x11, macOS, and Windows, with the `rwh_06` feature enabled.");
}