use fltk::{app, button::Button, frame::Frame, group::Pack, prelude::*, window::Window};
use std::cell::RefCell;
use std::rc::Rc;
pub struct MyEvent;
impl MyEvent {
const CHANGED: i32 = 40;
}
#[derive(Clone)]
pub struct Counter {
count: Rc<RefCell<i32>>,
}
impl Counter {
#[must_use]
pub fn new(val: i32) -> Self {
Counter {
count: Rc::from(RefCell::from(val)),
}
}
pub fn increment(&mut self) {
*self.count.borrow_mut() += 1;
app::handle_main(MyEvent::CHANGED).unwrap();
}
pub fn decrement(&mut self) {
*self.count.borrow_mut() -= 1;
app::handle_main(MyEvent::CHANGED).unwrap();
}
#[must_use]
pub fn value(&self) -> i32 {
*self.count.borrow()
}
}
fn main() -> Result<(), Box<dyn std::error::Error>> {
let app = app::App::default();
let counter = Counter::new(0);
let mut wind = Window::default().with_size(160, 200).with_label("Counter");
let mut pack = Pack::default().with_size(120, 140).center_of(&wind);
pack.set_spacing(10);
let mut but_inc = Button::default().with_size(0, 40).with_label("+");
let mut frame = Frame::default()
.with_size(0, 40)
.with_label(&counter.value().to_string());
let mut but_dec = Button::default().with_size(0, 40).with_label("-");
pack.end();
wind.end();
wind.show();
but_inc.set_callback({
let mut c = counter.clone();
move |_| c.increment()
});
but_dec.set_callback({
let mut c = counter.clone();
move |_| c.decrement()
});
frame.handle(move |f, ev| {
if ev == MyEvent::CHANGED.into() {
f.set_label(&counter.clone().value().to_string());
true
} else {
false
}
});
Ok(app.run()?)
}