lernie 0.1.111

lernie: the operator seat — the window and wire client for a yog server
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183

//! **What lifts under the pointer** (DESIGN §4.44 item 5): a row, a link and
//! a tab wear [`hover`] while the pointer is over them and nothing at rest;
//! a chosen row keeps its `RAISED`; and the link's mark is inside its seat.

use super::super::{link, link_marked, row, tab};
use crate::paint_probe::{fills_of, frame::Window, seen_of};
use crate::ui::theme::{INK, INK_FAINT, RAISED, hover};

/// One frame of `body` with the pointer at `at`, after one that laid it —
/// egui reads a hover off the previous frame's rects.
fn under(at: egui::Pos2, body: impl FnMut(&egui::Context)) -> egui::FullOutput {
    let window = Window::sized(300.0, 100.0);
    let mut body = body;
    window.frame(Vec::new(), &mut body);
    window.frame(vec![egui::Event::PointerMoved(at)], &mut body)
}

/// Whether one frame filled anything in the hover wash.
fn lifted(output: &egui::FullOutput) -> bool {
    fills_of(output).iter().any(|(_, fill)| *fill == hover())
}

/// Paint each pickable shape on its own line.
fn pickables(ctx: &egui::Context, chosen: bool) {
    egui::CentralPanel::default().show(ctx, |ui| {
        row(ui, "a row", INK, None, chosen, 0.0, "a row");
        link(ui, "a link", INK, "a link");
        tab(ui, "a tab", INK, "a tab");
    });
}

/// **Under the pointer each lifts, and nothing does away from it** — the
/// wash is the hover's alone, the brand at three quarters of the selection's.
#[test]
fn a_row_a_link_and_a_tab_lift_under_the_pointer() {
    let away = under(egui::pos2(290.0, 95.0), |ctx| pickables(ctx, false));
    assert!(!lifted(&away), "bare at rest");
    for words in ["a row", "a link", "a tab"] {
        let laid = under(egui::pos2(290.0, 95.0), |ctx| pickables(ctx, false));
        let at = seen_of(&laid)
            .into_iter()
            .find(|run| run.text == words)
            .unwrap_or_else(|| panic!("{words:?} on the glass"))
            .shown
            .center();
        assert!(lifted(&under(at, |ctx| pickables(ctx, false))), "{words}");
    }
}

/// **A chosen row under the pointer keeps its own, stronger tint.**
#[test]
fn a_chosen_row_keeps_its_raise_under_the_pointer() {
    let at = egui::pos2(20.0, 15.0);
    let output = under(at, |ctx| pickables(ctx, true));
    let fills = fills_of(&output);
    assert!(fills.iter().any(|(_, fill)| *fill == RAISED), "raised");
    let row = fills
        .iter()
        .find(|(rect, _)| rect.contains(at))
        .map(|(_, fill)| *fill);
    assert_ne!(row, Some(hover()), "not washed over");
}

/// **The mark is in the door**: one run on the glass, `<words> <mark>`, and
/// a pointer on the mark lifts the whole seat and is the hand.
#[test]
fn the_mark_is_inside_the_link() {
    let body = |ctx: &egui::Context| {
        egui::CentralPanel::default().show(ctx, |ui| {
            link_marked(ui, "model", INK, ("⏶", INK_FAINT), "opens");
        });
    };
    let laid = under(egui::pos2(290.0, 95.0), body);
    let run = seen_of(&laid)
        .into_iter()
        .find(|run| run.text == "model ⏶")
        .expect("one run");
    let on_mark = egui::pos2(run.shown.max.x - 2.0, run.shown.center().y);
    let output = under(on_mark, body);
    assert!(lifted(&output), "the mark lifts the seat");
    assert_eq!(
        output.platform_output.cursor_icon,
        egui::CursorIcon::PointingHand
    );
}

/// **A block row's seat is the block** (bl-232e): its aside and the lines
/// beneath stand inside the one rect the wash and the chosen tint fill.
#[test]
fn a_block_row_is_one_seat_over_every_line() {
    let body = |ctx: &egui::Context| {
        egui::CentralPanel::default().show(ctx, |ui| {
            super::super::Row {
                mark: ("?".to_owned(), INK),
                words: "head".to_owned(),
                ink: INK,
                state: None,
                chosen: false,
                indent: 0.0,
                aside: Some("2m".to_owned()),
                beneath: vec![("beneath".to_owned(), INK_FAINT, egui::TextStyle::Small)],
                door: None,
                help: "a block".to_owned(),
            }
            .paint(ui);
        });
    };
    let laid = under(egui::pos2(290.0, 95.0), body);
    let at = |text: &str| {
        seen_of(&laid)
            .into_iter()
            .find(|run| run.text == text)
            .unwrap_or_else(|| panic!("{text:?}"))
            .shown
    };
    let (aside, beneath) = (at("2m"), at("beneath"));
    assert!(
        aside.left() > at("? head").right(),
        "the aside at the right end"
    );
    let output = under(beneath.center(), body);
    let block = fills_of(&output)
        .into_iter()
        .find(|(_, fill)| *fill == hover())
        .expect("the pointer on a line beneath lifts the block")
        .0;
    assert!(block.contains(aside.center()) && block.contains(beneath.center()));
}

/// **A row's door tells its own sentence** (bl-a6b3): with the pointer
/// resting on the door, the door's help is on the glass and the row's is
/// not — egui would otherwise keep the row's tooltip open for as long as
/// the pointer stays inside the row, which the door is.
#[test]
fn a_doored_row_tells_the_door_under_the_pointer_and_itself_elsewhere() {
    let body = |ctx: &egui::Context| {
        egui::CentralPanel::default().show(ctx, |ui| {
            super::super::Row {
                mark: (String::new(), INK),
                words: "head".to_owned(),
                ink: INK,
                state: None,
                chosen: false,
                indent: 0.0,
                aside: None,
                beneath: Vec::new(),
                door: Some(("×", "the door's sentence")),
                help: "the row's sentence".to_owned(),
            }
            .paint_doored(ui);
        });
    };
    let window = Window::sized(300.0, 100.0);
    // **No delay and no grace**: the clock here is egui's own stand-in, a
    // frame at a time, and what is under test is which sentence shows.
    window.ctx().style_mut(|style| {
        style.interaction.tooltip_delay = 0.0;
        style.interaction.tooltip_grace_time = 0.0;
    });
    let mut body = body;
    let said = |output: &egui::FullOutput, words: &str| {
        seen_of(output).into_iter().any(|run| run.text == words)
    };
    window.frame(Vec::new(), &mut body);
    let on_row = egui::pos2(20.0, 15.0);
    let mut output = window.frame(vec![egui::Event::PointerMoved(on_row)], &mut body);
    for _ in 0..12 {
        output = window.frame(Vec::new(), &mut body);
    }
    assert!(said(&output, "the row's sentence"), "the row tells");
    let door = seen_of(&output)
        .into_iter()
        .find(|run| run.text == "×")
        .expect("the door stands while the pointer is on the row")
        .shown
        .center();
    output = window.frame(vec![egui::Event::PointerMoved(door)], &mut body);
    for _ in 0..12 {
        output = window.frame(Vec::new(), &mut body);
    }
    assert!(said(&output, "the door's sentence"), "the door tells");
    assert!(!said(&output, "the row's sentence"), "the row stands down");
}