bezel-ui 0.2.21

SwiftUI-flavored components for gpui — popovers, menus, buttons, toggles, and loaders
Documentation 
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//! The client-decoration geometry — which band a press lands in.
//!
//! The frame itself paints only under `Decorations::Client`, which macOS and
//! Windows never report, so what a test can reach here is the classification
//! the bands and the press handler share.

use gpui::{Pixels, ResizeEdge, Tiling, point, px, size};
use ui::window::{live, resize_edge};

/// A 200 x 100 window with a 10px band.
fn edge_at(x: f32, y: f32) -> Option<ResizeEdge> {
    resize_edge(point(px(x), px(y)), px(10.0), size(px(200.0), px(100.0)))
}

#[test]
fn a_press_on_the_content_resizes_nothing() {
    assert_eq!(edge_at(100.0, 50.0), None);
    // The band is exclusive at its inner edge: 10 is already content.
    assert_eq!(edge_at(10.0, 50.0), None);
    assert_eq!(edge_at(190.0, 50.0), None);
}

#[test]
fn each_side_resizes_its_own_edge() {
    assert_eq!(edge_at(100.0, 2.0), Some(ResizeEdge::Top));
    assert_eq!(edge_at(100.0, 98.0), Some(ResizeEdge::Bottom));
    assert_eq!(edge_at(2.0, 50.0), Some(ResizeEdge::Left));
    assert_eq!(edge_at(198.0, 50.0), Some(ResizeEdge::Right));
}

#[test]
fn a_corner_beats_the_two_edges_it_lies_in() {
    assert_eq!(edge_at(2.0, 2.0), Some(ResizeEdge::TopLeft));
    assert_eq!(edge_at(198.0, 2.0), Some(ResizeEdge::TopRight));
    assert_eq!(edge_at(2.0, 98.0), Some(ResizeEdge::BottomLeft));
    assert_eq!(edge_at(198.0, 98.0), Some(ResizeEdge::BottomRight));
}

/// A window narrower than two bands has overlapping sides, and every press in
/// it is still exactly one corner — never `None`, and never an edge.
#[test]
fn a_window_thinner_than_its_bands_is_all_corner() {
    let corners = [
        ResizeEdge::TopLeft,
        ResizeEdge::TopRight,
        ResizeEdge::BottomLeft,
        ResizeEdge::BottomRight,
    ];
    for x in 0..12 {
        for y in 0..12 {
            let edge = resize_edge(
                point(px(x as f32), px(y as f32)),
                px(10.0),
                size(px(12.0), px(12.0)),
            );
            assert!(
                edge.is_some_and(|edge| corners.contains(&edge)),
                "({x}, {y}) resized {edge:?}"
            );
        }
    }
}

/// The inset gpui is handed and the inset the press is classified against are
/// the same number, so a window that opens at the theme's own band answers for
/// a press one pixel inside it.
#[test]
fn the_band_is_the_theme_constant() {
    let inset: Pixels = px(theme::Theme::CLIENT_INSET);
    let window = size(px(400.0), px(300.0));
    assert_eq!(
        resize_edge(point(inset - px(1.0), px(150.0)), inset, window),
        Some(ResizeEdge::Left)
    );
    assert_eq!(resize_edge(point(inset, px(150.0)), inset, window), None);
}

#[test]
fn tiled_sides_disable_every_band_that_touches_them() {
    // Bits are top, bottom, left, right; corners require both sides free.
    let bands = [
        (ResizeEdge::Top, 0b0001, (100.0, 2.0)),
        (ResizeEdge::Bottom, 0b0010, (100.0, 98.0)),
        (ResizeEdge::Left, 0b0100, (2.0, 50.0)),
        (ResizeEdge::Right, 0b1000, (198.0, 50.0)),
        (ResizeEdge::TopLeft, 0b0101, (2.0, 2.0)),
        (ResizeEdge::TopRight, 0b1001, (198.0, 2.0)),
        (ResizeEdge::BottomLeft, 0b0110, (2.0, 98.0)),
        (ResizeEdge::BottomRight, 0b1010, (198.0, 98.0)),
    ];

    for mask in 0..16 {
        let tiling = Tiling {
            top: mask & 0b0001 != 0,
            bottom: mask & 0b0010 != 0,
            left: mask & 0b0100 != 0,
            right: mask & 0b1000 != 0,
        };
        for (edge, touched_sides, (x, y)) in bands {
            let enabled = mask & touched_sides == 0;
            assert_eq!(live(edge, tiling), enabled, "{edge:?}, {tiling:?}");
            assert_eq!(
                edge_at(x, y).filter(|edge| live(*edge, tiling)),
                enabled.then_some(edge),
                "({x}, {y}), {tiling:?}"
            );
        }
        assert_eq!(
            edge_at(100.0, 50.0).filter(|edge| live(*edge, tiling)),
            None
        );
    }
}

#[test]
fn maximized_caption_corner_and_outer_pixels_do_not_resize() {
    let tiling = Tiling::tiled();
    for x in 0..200 {
        for y in 0..100 {
            assert_eq!(
                edge_at(x as f32, y as f32).filter(|edge| live(*edge, tiling)),
                None,
                "({x}, {y})"
            );
        }
    }
}