monorepo/fitnesstrax/app/src/components/text_entry.rs

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/*
Copyright 2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
This file is part of FitnessTrax.
FitnessTrax is free software: you can redistribute it and/or modify it under the terms of the GNU
General Public License as published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
FitnessTrax is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License along with FitnessTrax. If not, see <https://www.gnu.org/licenses/>.
*/
use gtk::prelude::*;
use std::{cell::RefCell, rc::Rc};
pub struct ParseError;
#[derive(Clone)]
pub struct TextEntry<T: Clone + std::fmt::Debug> {
value: Rc<RefCell<Option<T>>>,
widget: gtk::Entry,
renderer: Rc<Box<dyn Fn(&T) -> String>>,
parser: Rc<Box<dyn Fn(&str) -> Result<T, ParseError>>>,
}
impl<T: Clone + std::fmt::Debug> std::fmt::Debug for TextEntry<T> {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> Result<(), std::fmt::Error> {
write!(
f,
"{{ value: {:?}, widget: {:?} }}",
self.value, self.widget
)
}
}
// I do not understand why the data should be 'static.
impl<T: Clone + std::fmt::Debug + 'static> TextEntry<T> {
pub fn new<R, V>(placeholder: &str, value: Option<T>, renderer: R, parser: V) -> Self
where
R: Fn(&T) -> String + 'static,
V: Fn(&str) -> Result<T, ParseError> + 'static,
{
let widget = gtk::Entry::builder().placeholder_text(placeholder).build();
match value {
Some(ref v) => widget.set_text(&renderer(&v)),
None => {}
}
let s = Self {
value: Rc::new(RefCell::new(value)),
widget,
renderer: Rc::new(Box::new(renderer)),
parser: Rc::new(Box::new(parser)),
};
s.widget.buffer().connect_text_notify({
let s = s.clone();
move |buffer| s.handle_text_change(buffer)
});
s
}
fn handle_text_change(&self, buffer: &gtk::EntryBuffer) {
if buffer.text().is_empty() {
*self.value.borrow_mut() = None;
self.widget.remove_css_class("error");
return;
}
match (self.parser)(buffer.text().as_str()) {
Ok(v) => {
println!("setting the value: {}", (self.renderer)(&v));
*self.value.borrow_mut() = Some(v);
self.widget.remove_css_class("error");
}
// need to change the border to provide a visual indicator of an error
Err(_) => {
self.widget.add_css_class("error");
}
}
}
pub fn value(&self) -> Option<T> {
let v = self.value.borrow().clone();
println!("retrieving the value: {:?}", v.map(|v| (self.renderer)(&v)));
self.value.borrow().clone()
}
pub fn set_value(&self, value: Option<T>) {
match value {
Some(ref v) => self.widget.set_text(&(self.renderer)(&v)),
None => {}
}
*self.value.borrow_mut() = value;
}
pub fn grab_focus(&self) {
self.widget.grab_focus();
}
pub fn widget(&self) -> gtk::Widget {
self.widget.clone().upcast::<gtk::Widget>()
}
}