relm 0.11.0

/*
 * Copyright (c) 2017 Boucher, Antoni <bouanto@zoho.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#![feature(proc_macro)]

extern crate gtk;
#[macro_use]
extern crate relm;
extern crate relm_attributes;
#[macro_use]
extern crate relm_derive;

use std::fmt::Display;

use gtk::{
    ButtonExt,
    Inhibit,
    LabelExt,
    OrientableExt,
    WidgetExt,
};
use gtk::Orientation::{Horizontal, Vertical};
use relm::Widget;
use relm_attributes::widget;

use self::CounterMsg::*;
use self::Msg::*;

pub trait IncDec {
    fn dec(&self) -> Self;
    fn inc(&self) -> Self;
}

impl IncDec for i32 {
    fn dec(&self) -> Self {
        *self - 1
    }

    fn inc(&self) -> Self {
        *self + 1
    }
}

pub struct Model<T> {
    counter: T,
}

#[derive(Msg)]
pub enum CounterMsg {
    Decrement,
    Increment,
}

#[widget]
impl<T: IncDec + Display> Widget for Counter<T> {
    fn model(value: T) -> Model<T> {
        Model {
            counter: value,
        }
    }

    fn update(&mut self, event: CounterMsg) {
        match event {
            Decrement => {
                self.model.counter = self.model.counter.dec();
            },
            Increment => {
                self.model.counter = self.model.counter.inc();
            },
        }
    }

    view! {
        gtk::Box {
            orientation: Vertical,
            gtk::Button {
                label: "+",
                clicked => Increment,
            },
            gtk::Label {
                text: &self.model.counter.to_string(),
            },
            gtk::Button {
                label: "-",
                clicked => Decrement,
            },
        }
    }
}

#[derive(Msg)]
pub enum Msg {
    Quit,
}

#[widget]
impl Widget for Win {
    fn model(_: ()) -> () {
        ()
    }

    fn update(&mut self, event: Msg) {
        match event {
            Quit => gtk::main_quit(),
        }
    }

    view! {
        gtk::Window {
            gtk::Box {
                orientation: Horizontal,
                Counter<i32>(2),
                Counter<i32>(3),
            },
            delete_event(_, _) => (Quit, Inhibit(false)),
        }
    }
}

fn main() {
    Win::run(()).unwrap();
}