• Dreg
  • Examples
  • Overview
    • Features
    • Limitations
    • Design Philosophy
  • Acknowledgments
  • License

use dreg::prelude::*;

fn main() -> Result<()> {
    let program = MyProgram { should_quit: false, latest_input: Input::Null };
    let platform = CrosstermPlatform::new()?;

    run_program(program, platform)?;

    Ok(())
}

struct MyProgram {
    should_quit: bool,
    latest_input: Input,
}

impl Program for MyProgram {
    fn update(&mut self, frame: Frame) {
        // When the user presses `q`, the program safely exits.
        if frame.context.keys_down().contains(&Scancode::Q) {
            self.should_quit = true;
            return; // No need to render anything past this point.
        }
        frame.buffer.set_string(
            1, // Column index (x-coordinate).
            1, // Row index (y-coordinate).
            format!("LATEST INPUT: {:?}", self.latest_input),
            Style::new(), // No styling, cells will default to the user's terminal foreground color.
        );
    }

    fn on_input(&mut self, input: Input) {
        self.latest_input = input;
    }

    fn on_platform_request(&self, request: &str) -> Option<&str> {
        // Terminals do not perform requests.
        None
    }

    fn should_exit(&self) -> bool {
        // This function is called every frame.
        self.should_quit
    }
}