//! Whether measuring a widget and then giving it the length it reported is a
//! fixed point, which is what a span that sizes to its children needs.

use iris::harness::Harness;
use iris::prelude::*;

#[test]
fn a_wrapping_text_in_a_span_settles_on_one_width() {
    let mut h = Harness::new((900, 600));
    let words = "the quick brown fox jumps over the lazy dog and keeps on running \
                 until it reaches the end of a rather long line of text";
    let t = wtext(words).size(16).wrap(true).add(&mut h.rsc);
    let filler = rect(Color::BLUE).add(&mut h.rsc);
    h.set_root((t, filler).span(Dir::RIGHT));

    let mut widths = Vec::new();
    for _ in 0..6 {
        let r = h.region(&t.id()).unwrap();
        widths.push(r.bot_right.x - r.top_left.x);
        // Redrawing it changes nothing about the state, so nothing may move.
        h.rsc.widgets_mut().get_dyn_mut(t.id());
        h.frame();
    }
    println!("widths over six frames: {widths:?}");
    assert!(
        widths.windows(2).all(|w| w[0] == w[1]),
        "a repaint that changed nothing moved it: {widths:?}"
    );
}