view-rc-refcell.rs

use iced::Sandbox;
use iced::{button, Alignment, Button, Column, Container, Element, Settings, Text};
use std::cell::RefCell;
use std::rc::Rc;

pub fn main() -> iced::Result {
    Counter::run(Settings::default())
}

#[derive(Debug, Default)]
struct Thing {
    name: String,
}

impl Thing {
    pub fn view(&mut self) -> Element<Message> {
        Container::new(Text::new(self.name.clone())).into()
    }
}

#[derive(Debug, Default)]
struct OtherStruct {
    pub things: Vec<Rc<RefCell<Thing>>>,
}

impl OtherStruct {
    fn new() -> Self {
        Self {
            things: vec![Rc::new(RefCell::new(Thing {
                name: "hello".to_string(),
            }))],
        }
    }
}

#[derive(Default)]
struct Counter {
    value: i32,
    increment_button: button::State,
    decrement_button: button::State,
    o: OtherStruct,
}

#[derive(Debug, Clone, Copy)]
enum Message {
    IncrementPressed,
    DecrementPressed,
}

impl Sandbox for Counter {
    type Message = Message;

    fn new() -> Self {
        Self {
            o: OtherStruct::new(),
            ..Default::default()
        }
    }

    fn title(&self) -> String {
        String::from("Counter - Iced")
    }

    fn update(&mut self, message: Message) {
        match message {
            Message::IncrementPressed => {
                self.value += 1;
            }
            Message::DecrementPressed => {
                self.value -= 1;
            }
        }
    }

    fn view(&mut self) -> Element<Message> {
        let other_view = self
            .o
            .things
            .iter_mut()
            .enumerate()
            .fold(Column::new(), |column, (_, item)| {
                column.push(item.borrow_mut().view())
            });
        Column::new()
            .padding(20)
            .align_items(Alignment::Center)
            .push(
                Button::new(&mut self.increment_button, Text::new("Increment"))
                    .on_press(Message::IncrementPressed),
            )
            .push(Text::new(self.value.to_string()).size(50))
            .push(
                Button::new(&mut self.decrement_button, Text::new("Decrement"))
                    .on_press(Message::DecrementPressed),
            )
            .push(other_view)
            .into()
    }
}