kaolin 0.1.15

A Rust library for flexible layouts, inspired by Clay
Documentation 
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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259

use kaolin::{
    Kaolin, fit, fixed, grow, sizing,
    style::{
        FlexStyle, TextStyle,
        layout::{Alignment, Direction, Justification, Layout},
        padding::Padding,
    },
};

mod common;
use common::*;

/// Tests basic nested container functionality.
/// Ensures that child containers are rendered correctly within their parent containers.
#[test]
fn basic_nested_containers() {
    let kaolin = Kaolin::new((800, 600), measure_text);
    let mut commands = kaolin.draw::<()>(|k| {
        k.styled(
            FlexStyle::new().sizing(sizing!(fixed!(800.0), fixed!(600.0))),
            |k| {
                k.styled(
                    FlexStyle::new().sizing(sizing!(fixed!(400.0), fixed!(300.0))),
                    |k| k.text("Nested Text", TextStyle::new()),
                )
            },
        )
    });

    assert_multiple!(
        commands.next(),
        assert_size((800.0, 600.0)),
        assert_position((0.0, 0.0))
    );
    assert_multiple!(
        commands.next(),
        assert_size((400.0, 300.0)),
        assert_position((0.0, 0.0))
    );
    assert_multiple!(
        commands.next(),
        assert_text_content("Nested Text"),
        assert_position((0.0, 0.0))
    );
}

/// Tests multiple levels of nesting with different layout directions.
/// Verifies that complex nested structures maintain correct positioning and sizing.
#[test]
fn multi_level_nesting_different_directions() {
    let kaolin = Kaolin::new((800, 600), measure_text);
    let mut commands = kaolin.draw::<()>(|k| {
        k.styled(
            FlexStyle::new()
                .sizing(sizing!(fixed!(800.0), fixed!(600.0)))
                .layout(Layout::new().direction(Direction::LeftToRight)),
            |k| {
                k.styled(
                    FlexStyle::new()
                        .sizing(sizing!(fixed!(400.0), fixed!(600.0)))
                        .layout(Layout::new().direction(Direction::TopToBottom)),
                    |k| {
                        k.styled(
                            FlexStyle::new().sizing(sizing!(fixed!(400.0), fixed!(200.0))),
                            |k| k.text("Top", TextStyle::new()),
                        )
                        .styled(
                            FlexStyle::new().sizing(sizing!(fixed!(400.0), fixed!(200.0))),
                            |k| k.text("Bottom", TextStyle::new()),
                        )
                    },
                )
                .styled(
                    FlexStyle::new().sizing(sizing!(fixed!(400.0), fixed!(600.0))),
                    |k| k.text("Right Side", TextStyle::new()),
                )
            },
        )
    });

    assert_size!(commands.next(), (800.0, 600.0)); // Main container
    assert_size!(commands.next(), (400.0, 600.0)); // Left vertical container
    assert_multiple!(
        commands.next(),
        assert_size((400.0, 200.0)), // Top child
        assert_position((0.0, 0.0))
    );
    assert_position!(commands.next(), (0.0, 0.0)); // "Top" text
    assert_multiple!(
        commands.next(),
        assert_size((400.0, 200.0)), // Bottom child
        assert_position((0.0, 200.0))
    );
    assert_position!(commands.next(), (0.0, 200.0)); // "Bottom" text
    assert_multiple!(
        commands.next(),
        assert_size((400.0, 600.0)), // Right container
        assert_position((400.0, 0.0))
    );
    assert_position!(commands.next(), (400.0, 0.0)); // "Right Side" text
}

/// Tests nested containers with growth behavior.
/// Ensures that nested growing elements correctly distribute available space.
#[test]
fn nested_containers_with_growth() {
    let kaolin = Kaolin::new((800, 600), measure_text);
    let mut commands = kaolin.draw::<()>(|k| {
        k.styled(FlexStyle::new().sizing(sizing!(grow!(1.0))), |k| {
            k.styled(FlexStyle::new().sizing(sizing!(grow!(1.0), fit!())), |k| {
                k.text("Inner Growth", TextStyle::new())
            })
        })
        .styled(FlexStyle::new().sizing(sizing!(grow!(1.0))), |k| {
            k.text("Sibling", TextStyle::new())
        })
    });

    // Each top-level container gets 400px (800/2)
    assert_size!(commands.next(), (400.0, 600.0)); // First container
    assert_size!(commands.next(), (400.0, 20.0)); // Inner container (fits to text height)
    assert_position!(commands.next(), (0.0, 0.0)); // "Inner Growth" text
    assert_multiple!(
        commands.next(),
        assert_size((400.0, 600.0)), // Second container
        assert_position((400.0, 0.0))
    );
    assert_position!(commands.next(), (400.0, 0.0)); // "Sibling" text
}

/// Tests nested containers with different alignment settings.
/// Verifies that alignment properties are correctly applied in nested contexts.
#[test]
fn nested_containers_different_alignments() {
    let kaolin = Kaolin::new((600, 400), measure_text);
    let mut commands = kaolin.draw::<()>(|k| {
        k.styled(
            FlexStyle::new()
                .sizing(sizing!(fixed!(600.0), fixed!(400.0)))
                .layout(
                    Layout::new()
                        .alignment(Alignment::Center)
                        .justification(Justification::Center),
                ),
            |k| {
                k.styled(
                    FlexStyle::new()
                        .sizing(sizing!(fixed!(200.0), fixed!(100.0)))
                        .layout(
                            Layout::new()
                                .alignment(Alignment::End)
                                .justification(Justification::End),
                        ),
                    |k| k.text("Nested", TextStyle::new()), // 60px wide
                )
            },
        )
    });

    assert_size!(commands.next(), (600.0, 400.0)); // Outer container
    // Centered in outer: (600-200)/2 = 200, (400-100)/2 = 150
    assert_multiple!(
        commands.next(),
        assert_size((200.0, 100.0)),
        assert_position((200.0, 150.0))
    );
    // Text positioned at end within inner container: 200-60=140, 100-20=80, plus inner position
    assert_position!(commands.next(), (340.0, 230.0));
}

/// Tests nested containers with padding affecting child positioning.
/// Ensures that padding cascades correctly through nested structures.
#[test]
fn nested_containers_with_padding() {
    let kaolin = Kaolin::new((800, 600), measure_text);
    let mut commands = kaolin.draw::<()>(|k| {
        k.styled(
            FlexStyle::new()
                .sizing(sizing!(fixed!(800.0), fixed!(600.0)))
                .padding(Padding::all(50.0)),
            |k| {
                k.styled(
                    FlexStyle::new()
                        .sizing(sizing!(fixed!(300.0), fixed!(200.0)))
                        .padding(Padding::all(25.0)),
                    |k| k.text("Padded Text", TextStyle::new()),
                )
            },
        )
    });

    assert_size!(commands.next(), (800.0, 600.0)); // Outer container
    // Inner positioned within outer padding
    assert_multiple!(
        commands.next(),
        assert_size((300.0, 200.0)),
        assert_position((50.0, 50.0))
    );
    // Text positioned within both paddings: 50 + 25 = 75
    assert_position!(commands.next(), (75.0, 75.0));
}

/// Tests deeply nested containers (3+ levels).
/// Verifies that very deep nesting doesn't break layout calculations.
#[test]
fn deeply_nested_containers() {
    let kaolin = Kaolin::new((400, 300), measure_text);
    let mut commands = kaolin.draw::<()>(|k| {
        k.styled(
            FlexStyle::new().sizing(sizing!(fixed!(400.0), fixed!(300.0))),
            |k| {
                k.styled(
                    FlexStyle::new().sizing(sizing!(fixed!(300.0), fixed!(200.0))),
                    |k| {
                        k.styled(
                            FlexStyle::new().sizing(sizing!(fixed!(200.0), fixed!(100.0))),
                            |k| {
                                k.styled(
                                    FlexStyle::new().sizing(sizing!(fixed!(100.0), fixed!(50.0))),
                                    |k| k.text("Deep", TextStyle::new()),
                                )
                            },
                        )
                    },
                )
            },
        )
    });

    assert_size!(commands.next(), (400.0, 300.0)); // Level 1
    assert_size!(commands.next(), (300.0, 200.0)); // Level 2
    assert_size!(commands.next(), (200.0, 100.0)); // Level 3
    assert_size!(commands.next(), (100.0, 50.0)); // Level 4
    assert_position!(commands.next(), (0.0, 0.0)); // Text at deepest level
}

/// Tests nested containers with mixed fit and fixed sizing.
/// Ensures that fit sizing works correctly within nested contexts.
#[test]
fn nested_fit_and_fixed_sizing() {
    let kaolin = Kaolin::new((800, 600), measure_text);
    let mut commands = kaolin.draw::<()>(|k| {
        k.styled(
            FlexStyle::new().sizing(sizing!(fixed!(800.0), fixed!(600.0))),
            |k| {
                k.styled(
                    FlexStyle::new(), // Fit sizing
                    |k| {
                        k.text("Auto Size Content", TextStyle::new()) // 170px wide, 20px tall
                    },
                )
            },
        )
    });

    assert_size!(commands.next(), (800.0, 600.0)); // Outer fixed container
    assert_size!(commands.next(), (170.0, 20.0)); // Inner container fits to content
    assert_position!(commands.next(), (0.0, 0.0)); // Text
}