use cursive::direction::Direction; use cursive::event::{Event, EventResult, Key}; use cursive::theme::Style; use cursive::view::View; use cursive::{Printer, Vec2}; use chrono::prelude::*; use chrono::{Local, NaiveDate}; use crate::habit::{Bit, Count, Habit, TrackEvent}; use crate::CONFIGURATION; pub trait ShadowView { fn draw(&self, printer: &Printer); fn required_size(&mut self, _: Vec2) -> Vec2; fn take_focus(&mut self, _: Direction) -> bool; fn on_event(&mut self, e: Event) -> EventResult; } // the only way to not rewrite each View implementation for trait // objects of Habit is to rewrite the View trait itself. impl ShadowView for T where T: Habit, T::HabitType: std::fmt::Display, { fn draw(&self, printer: &Printer) { let now = Local::now(); let year = now.year(); let month = now.month(); let goal_reached_style = Style::from(CONFIGURATION.reached_color); let todo_style = Style::from(CONFIGURATION.todo_color); let future_style = Style::from(CONFIGURATION.future_color); printer.with_style( if !printer.focused { future_style } else { goal_reached_style }, |p| { p.print( (0, 0), &format!("{:width$}", self.name(), width = CONFIGURATION.view_width), ) }, ); let mut i = 1; while let Some(d) = NaiveDate::from_ymd_opt(year, month, i) { let day_style; if self.reached_goal(d) { day_style = goal_reached_style; } else { day_style = todo_style; } let coords: Vec2 = ((i % 7) * 3, i / 7 + 2).into(); if let Some(c) = self.get_by_date(d) { printer.with_style(day_style, |p| { p.print(coords, &format!("{:^3}", c)); }); } else { printer.with_style(future_style, |p| { p.print(coords, &format!("{:^3}", CONFIGURATION.future_chr)); }); } i += 1; } } fn required_size(&mut self, _: Vec2) -> Vec2 { (25, 6).into() } fn take_focus(&mut self, _: Direction) -> bool { true } fn on_event(&mut self, e: Event) -> EventResult { let now = Local::now().naive_utc().date(); match e { Event::Key(Key::Enter) | Event::Char('n') => { self.modify(now, TrackEvent::Increment); return EventResult::Consumed(None); } Event::Key(Key::Backspace) | Event::Char('p') => { self.modify(now, TrackEvent::Decrement); return EventResult::Consumed(None); } _ => return EventResult::Ignored, } } } macro_rules! auto_view_impl { ($struct_name:ident) => { impl View for $struct_name { fn draw(&self, printer: &Printer) { ShadowView::draw(self, printer); } fn required_size(&mut self, x: Vec2) -> Vec2 { ShadowView::required_size(self, x) } fn take_focus(&mut self, d: Direction) -> bool { ShadowView::take_focus(self, d) } fn on_event(&mut self, e: Event) -> EventResult { ShadowView::on_event(self, e) } } }; } auto_view_impl!(Count); auto_view_impl!(Bit);