115 lines
3.9 KiB
Rust
115 lines
3.9 KiB
Rust
use std::{thread, time};
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use simple_logger::SimpleLogger;
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use winit::{
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event::{Event, KeyboardInput, WindowEvent},
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event_loop::{ControlFlow, EventLoop},
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window::WindowBuilder,
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};
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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enum Mode {
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Wait,
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WaitUntil,
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Poll,
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}
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const WAIT_TIME: time::Duration = time::Duration::from_millis(100);
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const POLL_SLEEP_TIME: time::Duration = time::Duration::from_millis(100);
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fn main() {
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SimpleLogger::new().init().unwrap();
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println!("Press '1' to switch to Wait mode.");
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println!("Press '2' to switch to WaitUntil mode.");
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println!("Press '3' to switch to Poll mode.");
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println!("Press 'R' to toggle request_redraw() calls.");
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println!("Press 'Esc' to close the window.");
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let event_loop = EventLoop::new();
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let window = WindowBuilder::new()
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.with_title("Press 1, 2, 3 to change control flow mode. Press R to toggle redraw requests.")
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.build(&event_loop)
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.unwrap();
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let mut mode = Mode::Wait;
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let mut request_redraw = false;
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let mut wait_cancelled = false;
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let mut close_requested = false;
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event_loop.run(move |event, _, control_flow| {
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use winit::event::{ElementState, StartCause, VirtualKeyCode};
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println!("{:?}", event);
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match event {
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Event::NewEvents(start_cause) => {
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wait_cancelled = match start_cause {
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StartCause::WaitCancelled { .. } => mode == Mode::WaitUntil,
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_ => false,
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}
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}
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Event::WindowEvent { event, .. } => match event {
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WindowEvent::CloseRequested => {
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close_requested = true;
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}
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WindowEvent::KeyboardInput {
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input:
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KeyboardInput {
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virtual_keycode: Some(virtual_code),
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state: ElementState::Pressed,
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..
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},
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..
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} => match virtual_code {
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VirtualKeyCode::Key1 => {
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mode = Mode::Wait;
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println!("\nmode: {:?}\n", mode);
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}
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VirtualKeyCode::Key2 => {
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mode = Mode::WaitUntil;
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println!("\nmode: {:?}\n", mode);
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}
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VirtualKeyCode::Key3 => {
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mode = Mode::Poll;
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println!("\nmode: {:?}\n", mode);
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}
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VirtualKeyCode::R => {
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request_redraw = !request_redraw;
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println!("\nrequest_redraw: {}\n", request_redraw);
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}
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VirtualKeyCode::Escape => {
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close_requested = true;
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}
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_ => (),
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},
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_ => (),
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},
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Event::MainEventsCleared => {
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if request_redraw && !wait_cancelled && !close_requested {
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window.request_redraw();
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}
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if close_requested {
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*control_flow = ControlFlow::Exit;
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}
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}
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Event::RedrawRequested(_window_id) => {}
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Event::RedrawEventsCleared => {
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*control_flow = match mode {
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Mode::Wait => ControlFlow::Wait,
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Mode::WaitUntil => {
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if wait_cancelled {
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*control_flow
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} else {
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ControlFlow::WaitUntil(time::Instant::now() + WAIT_TIME)
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}
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}
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Mode::Poll => {
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thread::sleep(POLL_SLEEP_TIME);
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ControlFlow::Poll
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}
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};
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}
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_ => (),
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}
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});
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}
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