//! Where a frame puts things, with no window to put them in.

use iris::harness::{Harness, assert_corners};
use iris::prelude::*;

/// A fixed 100 wide, and the rest of the 400 to its neighbour.
fn two_rects(h: &mut Harness) -> (WidgetId, WidgetId) {
    let left = rect(Color::RED).width(100).add(&mut h.rsc);
    let right = rect(Color::BLUE).add(&mut h.rsc);
    h.set_root((left, right).span(Dir::RIGHT));
    (left.id(), right.id())
}

#[test]
fn a_span_gives_each_child_the_width_it_asked_for() {
    let mut h = Harness::new((400, 200));
    let (left, right) = two_rects(&mut h);

    assert_corners!(h, left, (0, 0), (100, 200));
    assert_corners!(h, right, (100, 0), (400, 200));
}

#[test]
fn resizing_relays_out_against_the_new_output() {
    let mut h = Harness::new((400, 200));
    let (left, right) = two_rects(&mut h);

    h.resize((800, 100));
    assert!(h.needs_redraw());
    h.frame();

    assert_corners!(h, left, (0, 0), (100, 100));
    assert_corners!(h, right, (100, 0), (800, 100));
}

#[test]
fn an_empty_widget_takes_a_share_of_a_span() {
    let mut h = Harness::new((400, 200));
    let gap = ().add(&mut h.rsc);
    let right = rect(Color::BLUE).width(100).add(&mut h.rsc);
    h.set_root((gap, right).span(Dir::RIGHT));

    assert_corners!(h, gap, (0, 0), (300, 200));
    assert_corners!(h, right, (300, 0), (400, 200));
}

#[test]
fn a_child_drawn_twice_moves_once() {
    let mut h = Harness::new((400, 200));
    // `Aligned` draws its child twice; listing it twice would move it twice.
    let inner = rect(Color::BLUE).add(&mut h.rsc);
    let centered = inner.center().width(200).add(&mut h.rsc);
    let left = rect(Color::RED).width(100).add(&mut h.rsc);
    h.set_root((left, centered).span(Dir::RIGHT));
    assert_corners!(h, inner, (100, 0), (300, 200));

    h.rsc[left].x = Some(Len::abs(150));
    h.frame();

    assert_corners!(h, inner, (150, 0), (350, 200));
}