buoyant 0.6.1

SwiftUI-like UIs in Rust for embedded devices
Documentation 
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use buoyant::environment::DefaultEnvironment;
use buoyant::font::CharacterBufferFont;
use buoyant::match_view;
use buoyant::primitives::{Point, Size};
use buoyant::render::Render;
use buoyant::render_target::FixedTextBuffer;
use buoyant::view::{View, prelude::*};
use std::string::String;

mod common;
use crate::common::tap;

#[test]
fn test_match_view_two_variants() {
    let font = CharacterBufferFont;
    let make_view = |state| {
        match_view!(state, {
            0 => Text::new("zero\n!!!", &font),
            _ => Text::new("other", &font).foreground_color(' '),
        })
    };
    let mut buffer = FixedTextBuffer::<5, 5>::default();
    let env = DefaultEnvironment::default();

    let view = make_view(0);
    let mut state = view.build_state(&mut ());
    let layout = view.layout(&buffer.size().into(), &env, &mut (), &mut state);
    assert_eq!(layout.resolved_size, Size::new(4, 2).into());
    let tree = view.render_tree(&layout, Point::zero(), &env, &mut (), &mut state);
    tree.render(&mut buffer, &' ');
    assert_eq!(buffer.text[0].iter().collect::<String>(), "zero ");
    assert_eq!(buffer.text[1].iter().collect::<String>(), "!!!  ");
    assert_eq!(buffer.text[2].iter().collect::<String>(), "     ");

    buffer.clear();

    let view = make_view(1);
    let mut state = view.build_state(&mut ());
    let layout = view.layout(&buffer.size().into(), &env, &mut (), &mut state);
    assert_eq!(layout.resolved_size, Size::new(5, 1).into());
    let tree = view.render_tree(&layout, Point::zero(), &env, &mut (), &mut state);
    tree.render(&mut buffer, &' ');
    assert_eq!(buffer.text[0].iter().collect::<String>(), "other");
    assert_eq!(buffer.text[1].iter().collect::<String>(), "     ");
    assert_eq!(buffer.text[2].iter().collect::<String>(), "     ");
}

#[test]
fn test_match_view_three_variants() {
    #[derive(Clone)]
    enum State {
        A,
        B(&'static str),
        C,
    }

    let font = CharacterBufferFont;

    let make_view = |state| {
        match_view!(state, {
            State::A => Text::new("AAA", &font),
            State::B(msg) => Text::new(msg, &font),
            State::C => Text::new("CCC", &font),
        })
        .foreground_color(' ')
    };
    let mut buffer = FixedTextBuffer::<5, 5>::default();
    let env = DefaultEnvironment::default();

    let view = make_view(State::A);
    let mut state = view.build_state(&mut ());
    let layout = view.layout(&buffer.size().into(), &env, &mut (), &mut state);
    assert_eq!(layout.resolved_size, Size::new(3, 1).into());
    let tree = view.render_tree(&layout, Point::zero(), &env, &mut (), &mut state);
    tree.render(&mut buffer, &' ');
    assert_eq!(buffer.text[0].iter().collect::<String>(), "AAA  ");
    assert_eq!(buffer.text[1].iter().collect::<String>(), "     ");
    assert_eq!(buffer.text[2].iter().collect::<String>(), "     ");

    let view = make_view(State::B("BBB"));
    let mut state = view.build_state(&mut ());
    let layout = view.layout(&buffer.size().into(), &env, &mut (), &mut state);
    assert_eq!(layout.resolved_size, Size::new(3, 1).into());
    let tree = view.render_tree(&layout, Point::zero(), &env, &mut (), &mut state);
    tree.render(&mut buffer, &' ');
    assert_eq!(buffer.text[0].iter().collect::<String>(), "BBB  ");
    assert_eq!(buffer.text[1].iter().collect::<String>(), "     ");
    assert_eq!(buffer.text[2].iter().collect::<String>(), "     ");

    buffer.clear();

    let view = make_view(State::C);
    let mut state = view.build_state(&mut ());
    let layout = view.layout(&buffer.size().into(), &env, &mut (), &mut state);
    assert_eq!(layout.resolved_size, Size::new(3, 1).into());
    let tree = view.render_tree(&layout, Point::zero(), &env, &mut (), &mut state);
    tree.render(&mut buffer, &' ');
    assert_eq!(buffer.text[0].iter().collect::<String>(), "CCC  ");
    assert_eq!(buffer.text[1].iter().collect::<String>(), "     ");
    assert_eq!(buffer.text[2].iter().collect::<String>(), "     ");
}

#[test]
fn test_match_view_borrow() {
    #[allow(unused)]
    #[derive(Clone)]
    enum State {
        A,
        B(String),
        C,
    }

    fn borrow_view<'a>(
        s: &'a State,
        font: &'a CharacterBufferFont,
    ) -> impl View<char, ()> + use<'a> {
        match_view!(s, {
            State::A => Text::new("AAA", font),
            State::B(msg) => Text::new(msg, font),
            State::C => Text::new("CCC", font),
        })
    }

    let font = CharacterBufferFont;

    let mut buffer = FixedTextBuffer::<5, 5>::default();
    let env = DefaultEnvironment::default();

    let state = State::B("BBB".to_string());
    let view = borrow_view(&state, &font);
    let mut view_state = view.build_state(&mut ());
    let layout = view.layout(&buffer.size().into(), &env, &mut (), &mut view_state);
    assert_eq!(layout.resolved_size, Size::new(3, 1).into());
    let tree = view.render_tree(&layout, Point::zero(), &env, &mut (), &mut view_state);
    tree.render(&mut buffer, &' ');
    assert_eq!(buffer.text[0].iter().collect::<String>(), "BBB  ");
    assert_eq!(buffer.text[1].iter().collect::<String>(), "     ");
    assert_eq!(buffer.text[2].iter().collect::<String>(), "     ");
}

/// This could possibly be avoided by making an attempt at producing a new layout
/// when we go to render the view
#[should_panic(
    expected = "Layout/state branch mismatch in conditional view. Layouts cannot be reused."
)]
#[test]
fn test_match_view_two_variants_invalid_layout() {
    let font = CharacterBufferFont;
    let make_view = |state| {
        match_view!(state, {
            0 => Text::new("zero\n!!!", &font),
            _ => Text::new("other", &font).foreground_color(' '),
        })
    };
    let mut buffer = FixedTextBuffer::<5, 5>::default();
    let env = DefaultEnvironment::default();

    let view = make_view(0);
    let mut state = view.build_state(&mut ());
    let layout = view.layout(&buffer.size().into(), &env, &mut (), &mut state);

    let view = make_view(1);
    let tree = view.render_tree(&layout, Point::zero(), &env, &mut (), &mut state);
    tree.render(&mut buffer, &' ');
    assert_eq!(buffer.text[0].iter().collect::<String>(), "other");
    assert_eq!(buffer.text[1].iter().collect::<String>(), "     ");
    assert_eq!(buffer.text[2].iter().collect::<String>(), "     ");
}

fn match_3_view(condition: u32) -> impl View<char, i32> {
    match_view!(condition, {
        0 => Button::new(|x: &mut i32| *x += 1, |_| Rectangle),
        1 => Button::new(|x: &mut i32| *x -= 1, |_| Rectangle),
        _ => Button::new(|x: &mut i32| *x *= 2, |_| Rectangle),
    })
}

#[test]
fn match_3_event_routing() {
    let view = match_3_view(0);
    let mut x = 10;
    let mut state = view.build_state(&mut x);
    let size = Size::new(3, 3);

    tap(&view, &mut x, &mut state, size, 1, 1);
    assert_eq!(x, 11);

    let view = match_3_view(1);
    tap(&view, &mut x, &mut state, size, 1, 1);
    assert_eq!(x, 10);

    let view = match_3_view(2);
    tap(&view, &mut x, &mut state, size, 1, 1);
    assert_eq!(x, 20);
}