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annotate libmlk-ui/ui/button.c @ 277:1d10983fc0d7

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cmake: cleanup
author David Demelier <markand@malikania.fr>
date Sun, 13 Dec 2020 11:25:11 +0100
parents 71b3b7036de7
children 196264679079
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1 /*
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2 * button.c -- GUI button
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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/event.h>
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24 #include <core/maths.h>
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25 #include <core/painter.h>
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26 #include <core/trace.h>
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27
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28 #include "align.h"
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29 #include "button.h"
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30 #include "label.h"
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31 #include "theme.h"
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32 #include "ui_p.h"
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33
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34 static bool
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35 is_boxed(const struct button *button, const struct event_click *click)
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36 {
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37 assert(button);
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38 assert(click);
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39 assert(click->type == EVENT_CLICKDOWN || click->type == EVENT_CLICKUP);
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40
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41 return maths_is_boxed(button->x, button->y, button->w, button->h,
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42 click->x, click->y);
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43 }
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44
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45 static void
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46 handle(struct action *act, const union event *ev)
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47 {
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48 button_handle(act->data, ev);
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49 }
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50
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51 static void
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52 draw(struct action *act)
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53 {
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54 button_draw(act->data);
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55 }
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56
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57 void
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58 button_draw_default(const struct theme *t, const struct button *button)
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59 {
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60 assert(t);
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61 assert(button);
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62
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63 (void)t;
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64
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65 struct label label = {
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66 .text = button->text,
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67 };
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68 unsigned int lw, lh;
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69
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70 label_query(&label, &lw, &lh);
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71
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72 if (lw > button->w)
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73 tracef(_("button width is too small for text: %u < %u"), button->w, lw);
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74 if (lh > button->h)
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75 tracef(_("button height is too small for text: %u < %u"), button->h, lh);
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76
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77 align(ALIGN_CENTER, &label.x, &label.y, lw, lh,
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78 button->x, button->y, button->w, button->h);
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79
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80 painter_set_color(0x577277ff);
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81 painter_draw_rectangle(button->x, button->y, button->w, button->h);
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82
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83 label_draw(&label);
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84 }
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85
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86 void
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87 button_handle(struct button *button, const union event *ev)
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88 {
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89 assert(button);
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90 assert(ev);
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91
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92 switch (ev->type) {
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93 case EVENT_CLICKDOWN:
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94 if (is_boxed(button, &ev->click))
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95 button->state = BUTTON_STATE_PRESSED;
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96 break;
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97 case EVENT_CLICKUP:
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98 /*
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99 * If the button was pressed, indicate that the button is
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100 * finally activated. This let the user to move the cursor
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101 * outside the button to "forget" the press.
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102 */
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103 if (!is_boxed(button, &ev->click))
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104 button->state = BUTTON_STATE_NONE;
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105 else if (button->state == BUTTON_STATE_PRESSED)
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106 button->state = BUTTON_STATE_ACTIVATED;
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107 break;
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108 default:
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109 break;
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110 }
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111 }
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112
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113 void
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114 button_reset(struct button *button)
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115 {
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116 assert(button);
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117
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118 button->state = BUTTON_STATE_NONE;
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119 }
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120
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121 void
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122 button_draw(const struct button *button)
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123 {
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124 assert(button);
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125
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126 theme_draw_button(button->theme, button);
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127 }
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128
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129 void
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130 button_action(struct button *button, struct action *act)
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131 {
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132 assert(button);
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133 assert(act);
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134
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135 memset(act, 0, sizeof (*act));
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136 act->data = button;
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137 act->handle = handle;
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138 act->draw = draw;
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139 }