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annotate libui/ui/label.c @ 152:1008a796a9e7

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ui: make UI widgets usable as actions While here add a example-ui program with move support.
author David Demelier <markand@malikania.fr>
date Thu, 15 Oct 2020 18:09:45 +0200
parents b19d076856d2
children aa6e70e330a1
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1 /*
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2 * label.c -- GUI label
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3 *
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20 #include <string.h>
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21
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22 #include <core/action.h>
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23 #include <core/font.h>
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24 #include <core/panic.h>
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25 #include <core/texture.h>
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26
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27 #include "label.h"
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28 #include "theme.h"
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29
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30 static void
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31 draw(struct action *act)
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32 {
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33 label_draw(act->data);
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34 }
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35
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36 void
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37 label_draw_default(struct theme *t, const struct label *label)
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38 {
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39 assert(t);
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40 assert(label);
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41
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42 struct font *font;
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43 struct texture tex;
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44 int x, y, bx, by;
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45 unsigned int tw, th, bw, bh;
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46
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47 /* Compute real box size according to padding. */
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48 bx = label->x + t->padding;
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49 by = label->y + t->padding;
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50 bw = label->w - (t->padding * 2);
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51 bh = label->h - (t->padding * 2);
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52
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53 /* Make a shallow copy of the interface font. */
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54 font = t->fonts[THEME_FONT_INTERFACE];
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55
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56 /* Compute text size. */
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57 if (!font_box(font, label->text, &tw, &th))
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58 panic();
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59
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60 /* Align if needed. */
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61 x = label->x;
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62 y = label->y;
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63
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64 align(label->align, &x, &y, tw, th, bx, by, bw, bh);
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65
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66 /* Shadow text, only if enabled. */
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67 if (label->flags & LABEL_FLAGS_SHADOW) {
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68 font->color = t->colors[THEME_COLOR_SHADOW];
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69
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70 if (!font_render(font, &tex, label->text))
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71 panic();
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72
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73 texture_draw(&tex, x + 1, y + 1);
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74 texture_finish(&tex);
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75 }
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76
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77 /* Normal text. */
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78 font->color = t->colors[THEME_COLOR_NORMAL];
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79
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80 if (!font_render(font, &tex, label->text))
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81 panic();
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82
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83 texture_draw(&tex, x, y);
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84 texture_finish(&tex);
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85 }
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86
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87 void
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88 label_draw(const struct label *label)
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89 {
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90 assert(label);
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91 assert(label->text);
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92
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93 theme_draw_label(label->theme, label);
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94 }
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95
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96 void
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97 label_action(struct label *label, struct action *act)
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98 {
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99 assert(label);
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100 assert(act);
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101
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102 memset(act, 0, sizeof (*act));
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103 act->data = label;
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104 act->draw = draw;
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105 }