use fltk::{prelude::*, *};
fn main() {
let app = app::App::default().with_scheme(app::Scheme::Gleam);
let mut win = window::Window::default().with_size(150, 200);
let mut col = group::Flex::default()
.column()
.with_size(130, 180)
.center_of(&win);
col.set_pad(5);
frame::Frame::default()
.with_size(0, 40)
.with_label("Celcius")
.with_align(enums::Align::Inside | enums::Align::Bottom);
let mut inp1 = input::FloatInput::default().with_size(0, 40);
frame::Frame::default()
.with_size(0, 40)
.with_label("Farenheit")
.with_align(enums::Align::Inside | enums::Align::Bottom);
let mut inp2 = input::FloatInput::default().with_size(0, 40);
col.end();
win.end();
win.show();
inp1.set_value(&format!("{}", 0.0));
inp2.set_value(&format!("{}", 32.0));
inp1.set_trigger(enums::CallbackTrigger::Changed);
inp2.set_trigger(enums::CallbackTrigger::Changed);
inp1.set_callback({
let mut inp2 = inp2.clone();
move |i| {
let inp1_val: f64 = if i.value().is_empty() {
0.0
} else {
i.value().parse().unwrap_or(0.0)
};
inp2.set_value(&format!("{:.4}", c_to_f(inp1_val)));
}
});
inp2.set_callback(move |i| {
let inp2_val: f64 = if i.value().is_empty() {
0.0
} else {
i.value().parse().unwrap_or(0.0)
};
inp1.set_value(&format!("{:.4}", f_to_c(inp2_val)));
});
app.run().unwrap();
}
fn c_to_f(val: f64) -> f64 {
(val * 9.0 / 5.0) + 32.0
}
fn f_to_c(val: f64) -> f64 {
(val - 32.0) * 5.0 / 9.0
}