cranpose 0.1.162

use super::*;

const PAGE: WebWheelPage = WebWheelPage {
    width: 800.0,
    height: 600.0,
};

fn dom(delta_x: f32, delta_y: f32, delta_mode: u32) -> WheelScroll {
    wheel_scroll_from_dom(delta_x, delta_y, delta_mode, PAGE, Modifiers::NONE, 0)
}

#[test]
fn a_wheel_turned_down_in_the_browser_scrolls_the_same_way_it_does_on_the_desktop() {
    let down = dom(0.0, 100.0, DOM_DELTA_PIXEL);
    let up = dom(0.0, -100.0, DOM_DELTA_PIXEL);

    assert_eq!(down.delta.y, -100.0);
    assert_eq!(up.delta.y, 100.0);
}

#[test]
fn the_horizontal_axis_is_negated_with_the_vertical_one() {
    let right = dom(75.0, 0.0, DOM_DELTA_PIXEL);

    assert_eq!(right.delta.x, -75.0);
    assert_eq!(right.delta.y, 0.0);
}

#[test]
fn line_and_page_modes_are_converted_to_pixels() {
    assert_eq!(dom(0.0, 3.0, DOM_DELTA_LINE).delta.y, -120.0);
    assert_eq!(dom(2.0, 0.0, DOM_DELTA_LINE).delta.x, -80.0);
    assert_eq!(dom(0.0, 1.0, DOM_DELTA_PAGE).delta.y, -PAGE.height);
    assert_eq!(dom(1.0, 0.0, DOM_DELTA_PAGE).delta.x, -PAGE.width);
}

#[test]
fn a_degenerate_page_size_still_scrolls() {
    let sample = wheel_scroll_from_dom(
        0.0,
        1.0,
        DOM_DELTA_PAGE,
        WebWheelPage {
            width: 0.0,
            height: 0.0,
        },
        Modifiers::NONE,
        0,
    );

    assert_eq!(sample.delta.y, -1.0);
}

#[test]
fn an_unknown_delta_mode_is_read_as_pixels_rather_than_dropped() {
    assert_eq!(dom(0.0, 12.0, 99).delta.y, -12.0);
}

#[test]
fn a_browser_pinch_arrives_as_the_zoom_gesture_and_zooms_in_when_spread() {
    let spread = wheel_scroll_from_dom(
        0.0,
        -40.0,
        DOM_DELTA_PIXEL,
        PAGE,
        Modifiers {
            ctrl: true,
            ..Modifiers::NONE
        },
        0,
    );

    assert!(spread.is_zoom());
    assert!(spread.zoom_factor() > 1.0);
}