examples/grabbing.rs


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#[cfg(target_os = "android")]
#[macro_use]
extern crate android_glue;

extern crate glutin;

use glutin::{Event, ElementState};

mod support;

#[cfg(target_os = "android")]
android_start!(main);

#[cfg(not(feature = "window"))]
fn main() { println!("This example requires glutin to be compiled with the `window` feature"); }

#[cfg(feature = "window")]
fn main() {
    
    let window = glutin::Window::new().unwrap();
    window.set_title("glutin - Cursor grabbing test");
    unsafe { window.make_current() };

    let context = support::load(&window);
    let mut grabbed = false;
    
    while !window.is_closed() {
        context.draw_frame((0.0, 1.0, 0.0, 1.0));
        window.swap_buffers();

        for event in window.poll_events() {
            match event {
                Event::KeyboardInput(ElementState::Pressed, _, _) => {
                    if grabbed {
                        grabbed = false;
                        window.ungrab_cursor();
                    }
                    else {
                        grabbed = true;
                        window.grab_cursor().ok().expect("could not grab mouse cursor");
                    }
                },
                _ => (),
            }
            
        }
        
    }
}