uzor 1.2.2

Core UI engine — geometry, interaction, input state
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
260
261
262
263
264
265
266

//! Checkbox render entry point — dispatches over `CheckboxRenderKind`.

use crate::render::{RenderContext, TextAlign, TextBaseline};
use crate::types::{Rect, WidgetState};

use super::settings::CheckboxSettings;
use super::types::{CheckboxRenderKind, CheckboxView};

/// Render a checkbox widget, dispatching on `kind`.
///
/// # Arguments
/// - `ctx`      — render context.
/// - `rect`     — bounding rect (box origin; `width == height == style.size()` by convention).
/// - `state`    — interaction state from the coordinator.
/// - `view`     — per-frame data (checked, label).
/// - `settings` — visual configuration.
/// - `kind`     — which render variant to use.
/// - `font`     — font string for the optional label.
pub fn draw_checkbox(
    ctx:      &mut dyn RenderContext,
    rect:     Rect,
    state:    WidgetState,
    view:     &CheckboxView<'_>,
    settings: &CheckboxSettings,
    kind:     &CheckboxRenderKind<'_>,
    font:     &str,
) {
    match kind {
        CheckboxRenderKind::Standard => draw_standard(ctx, rect, view, settings, font),
        CheckboxRenderKind::Visibility => draw_standard(ctx, rect, view, settings, font),
        CheckboxRenderKind::LevelVisibility => draw_standard(ctx, rect, view, settings, font),
        CheckboxRenderKind::Cross => draw_cross(ctx, rect, view, settings, font),
        CheckboxRenderKind::CircleCheck => draw_circle_check(ctx, rect, view, settings, font),
        CheckboxRenderKind::Notification => draw_notification(ctx, rect, view, settings, font),
        CheckboxRenderKind::Custom(f) => f(ctx, rect, state, view, settings),
    }
}

// =============================================================================
// Standard / Visibility / LevelVisibility (sections 21-23)
// =============================================================================

fn draw_standard(
    ctx:      &mut dyn RenderContext,
    rect:     Rect,
    view:     &CheckboxView<'_>,
    settings: &CheckboxSettings,
    font:     &str,
) {
    let style = settings.style.as_ref();
    let theme = settings.theme.as_ref();
    let r = style.radius();

    // Fixed-size box (16×16) at left of rect, vertically centred.
    let box_size = style.size();
    let box_x = rect.x;
    let box_y = rect.y + (rect.height - box_size) / 2.0;

    // Background fill
    let bg = if view.checked {
        theme.checkbox_bg_checked()
    } else {
        theme.checkbox_bg_unchecked()
    };
    ctx.set_fill_color(bg);
    ctx.fill_rounded_rect(box_x, box_y, box_size, box_size, r);

    // Border stroke
    ctx.set_stroke_color(theme.checkbox_border());
    ctx.set_stroke_width(style.border_width());
    ctx.set_line_dash(&[]);
    ctx.stroke_rounded_rect(box_x, box_y, box_size, box_size, r);

    // Checkmark path
    if view.checked {
        let inset = style.checkmark_inset();
        ctx.set_stroke_color(theme.checkbox_checkmark());
        ctx.set_stroke_width(style.checkmark_width());
        ctx.set_line_dash(&[]);
        ctx.begin_path();
        ctx.move_to(box_x + 3.0, box_y + box_size / 2.0);
        ctx.line_to(box_x + 6.0, box_y + box_size - inset);
        ctx.line_to(box_x + box_size - 3.0, box_y + inset);
        ctx.stroke();
    }

    // Label to the right of the box
    let box_rect = Rect::new(box_x, box_y, box_size, box_size);
    draw_label(ctx, box_rect, view, settings, font);
}

// =============================================================================
// Notification (section 24)
// =============================================================================

fn draw_notification(
    ctx:      &mut dyn RenderContext,
    rect:     Rect,
    view:     &CheckboxView<'_>,
    settings: &CheckboxSettings,
    font:     &str,
) {
    let style = settings.style.as_ref();
    let theme = settings.theme.as_ref();
    let r = style.radius();

    let box_size = style.size();
    let box_x = rect.x;
    let box_y = rect.y + (rect.height - box_size) / 2.0;

    // Outer square — stroke only
    ctx.set_stroke_color(theme.checkbox_border());
    ctx.set_stroke_width(style.border_width());
    ctx.set_line_dash(&[]);
    ctx.stroke_rounded_rect(box_x, box_y, box_size, box_size, r);

    // Inner filled rect when enabled
    if view.checked {
        let inset = 3.0_f64;
        ctx.set_fill_color(theme.checkbox_notification_inner());
        ctx.fill_rounded_rect(
            box_x + inset,
            box_y + inset,
            box_size - inset * 2.0,
            box_size - inset * 2.0,
            1.0,
        );
    }

    let box_rect = Rect::new(box_x, box_y, box_size, box_size);
    draw_label(ctx, box_rect, view, settings, font);
}

// =============================================================================
// Cross variant (reserve)
// =============================================================================

fn draw_cross(
    ctx:      &mut dyn RenderContext,
    rect:     Rect,
    view:     &CheckboxView<'_>,
    settings: &CheckboxSettings,
    font:     &str,
) {
    let style = settings.style.as_ref();
    let theme = settings.theme.as_ref();
    let r = style.radius();

    let box_size = style.size();
    let box_x = rect.x;
    let box_y = rect.y + (rect.height - box_size) / 2.0;

    let bg = if view.checked {
        theme.checkbox_bg_checked()
    } else {
        theme.checkbox_bg_unchecked()
    };
    ctx.set_fill_color(bg);
    ctx.fill_rounded_rect(box_x, box_y, box_size, box_size, r);

    ctx.set_stroke_color(theme.checkbox_border());
    ctx.set_stroke_width(style.border_width());
    ctx.set_line_dash(&[]);
    ctx.stroke_rounded_rect(box_x, box_y, box_size, box_size, r);

    if view.checked {
        let inset = 4.0_f64;
        let x1 = box_x + inset;
        let y1 = box_y + inset;
        let x2 = box_x + box_size - inset;
        let y2 = box_y + box_size - inset;
        ctx.set_stroke_color(theme.checkbox_checkmark());
        ctx.set_stroke_width(style.checkmark_width());
        ctx.set_line_dash(&[]);
        ctx.begin_path();
        ctx.move_to(x1, y1);
        ctx.line_to(x2, y2);
        ctx.stroke();
        ctx.begin_path();
        ctx.move_to(x2, y1);
        ctx.line_to(x1, y2);
        ctx.stroke();
    }

    let box_rect = Rect::new(box_x, box_y, box_size, box_size);
    draw_label(ctx, box_rect, view, settings, font);
}

// =============================================================================
// CircleCheck variant (reserve)
// =============================================================================

fn draw_circle_check(
    ctx:      &mut dyn RenderContext,
    rect:     Rect,
    view:     &CheckboxView<'_>,
    settings: &CheckboxSettings,
    font:     &str,
) {
    use std::f64::consts::TAU;

    let style = settings.style.as_ref();
    let theme = settings.theme.as_ref();

    let box_size = style.size();
    let box_x = rect.x;
    let box_y = rect.y + (rect.height - box_size) / 2.0;
    let box_rect_inner = Rect::new(box_x, box_y, box_size, box_size);
    let r = box_size / 2.0;
    let cx = box_rect_inner.center_x();
    let cy = box_rect_inner.center_y();

    let bg = if view.checked {
        theme.checkbox_bg_checked()
    } else {
        theme.checkbox_bg_unchecked()
    };

    ctx.begin_path();
    ctx.arc(cx, cy, r, 0.0, TAU);
    ctx.set_fill_color(bg);
    ctx.fill();

    ctx.begin_path();
    ctx.arc(cx, cy, r, 0.0, TAU);
    ctx.set_stroke_color(theme.checkbox_border());
    ctx.set_stroke_width(style.border_width());
    ctx.set_line_dash(&[]);
    ctx.stroke();

    if view.checked {
        let inner_r = r * 0.5;
        ctx.begin_path();
        ctx.arc(cx, cy, inner_r, 0.0, TAU);
        ctx.set_fill_color(theme.checkbox_checkmark());
        ctx.fill();
    }

    draw_label(ctx, box_rect_inner, view, settings, font);
}

// =============================================================================
// Shared label helper
// =============================================================================

fn draw_label(
    ctx:      &mut dyn RenderContext,
    rect:     Rect,
    view:     &CheckboxView<'_>,
    settings: &CheckboxSettings,
    font:     &str,
) {
    if let Some(label) = view.label {
        let style = settings.style.as_ref();
        let theme = settings.theme.as_ref();
        ctx.set_font(font);
        ctx.set_fill_color(theme.checkbox_label_text());
        ctx.set_text_align(TextAlign::Left);
        ctx.set_text_baseline(TextBaseline::Middle);
        ctx.fill_text(
            label,
            rect.x + rect.width + style.label_gap(),
            rect.y + rect.height / 2.0,
        );
    }
}