Mercurial > molko

comparison libmlk-ui/mlk/ui/gridmenu.c @ 433:862b15c3a3ae

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
ui: cleanup hierarchy
author David Demelier <markand@malikania.fr>
date Sat, 15 Oct 2022 21:19:25 +0200
parents src/libmlk-ui/ui/gridmenu.c@8f59201dc76b
children 773a082f0b91
comparison
equal deleted inserted replaced
432:38cf60f5a1c4 433:862b15c3a3ae
1 /*
2 * gridmenu.c -- GUI grid menu
3 *
4 * Copyright (c) 2020-2022 David Demelier <markand@malikania.fr>
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <assert.h>
20 #include <math.h>
21 #include <string.h>
22
23 #include <mlk/core/event.h>
24 #include <mlk/core/maths.h>
25 #include <mlk/core/painter.h>
26 #include <mlk/core/panic.h>
27 #include <mlk/core/texture.h>
28 #include <mlk/core/trace.h>
29
30 #include "frame.h"
31 #include "label.h"
32 #include "gridmenu.h"
33 #include "theme.h"
34
35 #define THEME(m) ((m)->theme ? (m)->theme : theme_default())
36
37 struct index {
38 unsigned int row;
39 unsigned int col;
40 };
41
42 static struct index
43 get_index(const struct gridmenu *menu)
44 {
45 return (struct index) {
46 .row = menu->selected / menu->ncols,
47 .col = menu->selected % menu->ncols
48 };
49 }
50
51 static void
52 geometry(struct gridmenu *menu)
53 {
54 const struct theme *theme = THEME(menu);
55 struct label label = {
56 .theme = theme,
57 .flags = LABEL_FLAGS_SHADOW
58 };
59 unsigned int reqw = 0, reqh = 0, lw, lh;
60
61 /* Compute which item has the bigger width/height to create a spacing. */
62 menu->eltw = menu->elth = 0;
63 menu->spacew = menu->spaceh = 0;
64
65 for (size_t i = 0; i < menu->itemsz; ++i) {
66 if (!(label.text = menu->items[i]))
67 continue;
68
69
70 label_query(&label, &lw, &lh);
71
72 menu->eltw = fmax(menu->eltw, lw);
73 menu->elth = fmax(menu->elth, lh);
74 }
75
76 /* Total texture size required to draw items. */
77 reqw = (theme->padding * 2) + (menu->eltw * menu->ncols);
78 reqh = (theme->padding * 2) + (menu->elth * menu->nrows);
79
80 /*
81 * Compute spacing between elements. We remove the padding because it
82 * is outside of the elements.
83 */
84 if (reqw > menu->w) {
85 tracef("gridmenu width is too small: %u < %u", menu->w, reqw);
86 menu->spacew = 1;
87 } else if (menu->ncols > 1) {
88 reqw -= theme->padding * 2;
89 menu->spacew = (menu->w - reqw) / menu->ncols;
90 }
91
92 if (reqh > menu->h) {
93 tracef("gridmenu height is too small: %u < %u", menu->h, reqh);
94 menu->spaceh = 1;
95 } else if (menu->nrows > 1) {
96 reqh -= theme->padding * 2;
97 menu->spaceh = (menu->h - reqh) / menu->nrows;
98 }
99 }
100
101 static void
102 draw_frame(const struct gridmenu *menu)
103 {
104 const struct frame f = {
105 .x = menu->x,
106 .y = menu->y,
107 .w = menu->w,
108 .h = menu->h,
109 .theme = menu->theme,
110 };
111
112 frame_draw(&f);
113 }
114
115 static void
116 draw_labels(const struct gridmenu *menu)
117 {
118 size_t pagesz, pagenr, item, c = 0, r = 0;
119 struct label label = {0};
120 const struct theme *theme = THEME(menu);
121
122 label.theme = theme;
123 label.flags = LABEL_FLAGS_SHADOW;
124
125 /*
126 * Select the first top-left column based on the current selection and
127 * the number of rows/columns.
128 */
129 pagesz = menu->nrows * menu->ncols;
130 pagenr = menu->selected / pagesz;
131
132 for (size_t i = 0; i < pagesz; ++i) {
133 item = i + pagenr * pagesz;
134
135 if (item >= menu->itemsz || !menu->items[item])
136 continue;
137
138 label.text = menu->items[item];
139 label.x = menu->x + theme->padding + (c * menu->eltw) + (c * menu->spacew);
140 label.y = menu->y + theme->padding + (r * menu->elth) + (r * menu->spaceh);
141
142 if (i == menu->selected % pagesz)
143 label.flags |= LABEL_FLAGS_SELECTED;
144 else
145 label.flags &= ~(LABEL_FLAGS_SELECTED);
146
147 label_draw(&label);
148
149 if (++c >= menu->ncols) {
150 ++r;
151 c = 0;
152 }
153 }
154 }
155
156 static int
157 handle_keydown(struct gridmenu *menu, const struct event_key *key)
158 {
159 assert(key->type == EVENT_KEYDOWN);
160
161 const struct index idx = get_index(menu);
162 int validate = 0;
163
164 switch (key->key) {
165 case KEY_UP:
166 if (idx.row > 0)
167 menu->selected -= menu->ncols;
168 break;
169 case KEY_RIGHT:
170 if (menu->selected + 1U < menu->itemsz)
171 menu->selected += 1;
172 break;
173 case KEY_DOWN:
174 if (idx.row + 1U < menu->itemsz / menu->ncols)
175 menu->selected += menu->ncols;
176 else
177 menu->selected = menu->itemsz - 1;
178 break;
179 case KEY_LEFT:
180 if (idx.col > 0)
181 menu->selected -= 1;
182 break;
183 case KEY_ENTER:
184 validate = 1;
185 break;
186 default:
187 break;
188 }
189
190 return validate;
191 }
192
193 static int
194 handle_clickdown(struct gridmenu *menu, const struct event_click *click)
195 {
196 assert(click->type == EVENT_CLICKDOWN);
197
198 const struct theme *theme = THEME(menu);
199 size_t pagesz, pagenr, selected, c = 0, r = 0;
200 int x, y;
201
202 pagesz = menu->nrows * menu->ncols;
203 pagenr = menu->selected / pagesz;
204
205 for (size_t i = 0; i < pagesz; ++i) {
206 x = menu->x + theme->padding + (c * menu->eltw) + (c * menu->spacew);
207 y = menu->y + theme->padding + (r * menu->elth) + (r * menu->spaceh);
208
209 if (maths_is_boxed(x, y, menu->eltw, menu->elth, click->x, click->y)) {
210 selected = c + r * menu->ncols;
211 selected += pagesz * pagenr;
212
213 if (selected < menu->itemsz) {
214 menu->selected = selected;
215 return 1;
216 }
217 }
218
219 if (++c >= menu->ncols) {
220 ++r;
221 c = 0;
222 }
223 }
224
225 return 0;
226 }
227
228 void
229 gridmenu_init(struct gridmenu *menu,
230 unsigned int nr,
231 unsigned int nc,
232 const char * const *items,
233 size_t itemsz)
234 {
235 assert(menu);
236 assert(nr);
237 assert(nc);
238
239 memset(menu, 0, sizeof (*menu));
240
241 menu->nrows = nr;
242 menu->ncols = nc;
243 menu->items = items;
244 menu->itemsz = itemsz;
245 }
246
247 void
248 gridmenu_resize(struct gridmenu *menu, int x, int y, unsigned int w, unsigned int h)
249 {
250 assert(menu);
251
252 menu->x = x;
253 menu->y = y;
254 menu->w = w;
255 menu->h = h;
256
257 geometry(menu);
258 }
259
260 int
261 gridmenu_handle(struct gridmenu *menu, const union event *ev)
262 {
263 assert(menu);
264 assert(ev);
265
266 switch (ev->type) {
267 case EVENT_KEYDOWN:
268 return handle_keydown(menu, &ev->key);
269 break;
270 case EVENT_CLICKDOWN:
271 return handle_clickdown(menu, &ev->click);
272 break;
273 default:
274 break;
275 }
276
277 return 0;
278 }
279
280 void
281 gridmenu_draw(const struct gridmenu *menu)
282 {
283 assert(menu);
284
285 draw_frame(menu);
286 draw_labels(menu);
287 }