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annotate libui/ui/button.c @ 161:31d7f23c0588

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ui: label no longer has w, h fields
author David Demelier <markand@malikania.fr>
date Sat, 17 Oct 2020 10:12:41 +0200
parents aa6e70e330a1
children aab824406d3d
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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
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33 static bool
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34 is_boxed(const struct button *button, const struct event_click *click)
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35 {
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36 assert(button);
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37 assert(click);
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38 assert(click->type == EVENT_CLICKDOWN || click->type == EVENT_CLICKUP);
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39
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40 return maths_is_boxed(button->x, button->y, button->w, button->h,
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41 click->x, click->y);
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42 }
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43
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44 static void
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45 handle(struct action *act, const union event *ev)
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46 {
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47 button_handle(act->data, ev);
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48 }
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49
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50 static void
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51 draw(struct action *act)
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52 {
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53 button_draw(act->data);
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54 }
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55
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56 void
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57 button_draw_default(struct theme *t, const struct button *button)
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58 {
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59 assert(t);
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60 assert(button);
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61
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62 (void)t;
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63
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64 struct label label = {
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65 .text = button->text,
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66 };
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67 unsigned int lw, lh;
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68
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69 label_query(&label, &lw, &lh);
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70
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71 if (lw > button->w)
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72 trace("button is too small for text: %u < %u", button->w, lw);
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73 if (lh > button->h)
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74 trace("button is too small for text: %u < %u", button->h, lh);
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75
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76 align(ALIGN_CENTER, &label.x, &label.y, lw, lh,
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77 button->x, button->y, button->w, button->h);
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78
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79 painter_set_color(0x577277ff);
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80 painter_draw_rectangle(button->x, button->y, button->w, button->h);
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81
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82 label_draw(&label);
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83 }
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84
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85 void
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86 button_handle(struct button *button, const union event *ev)
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87 {
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88 assert(button);
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89 assert(ev);
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90
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91 switch (ev->type) {
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92 case EVENT_CLICKDOWN:
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93 if (is_boxed(button, &ev->click))
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94 button->state = BUTTON_STATE_PRESSED;
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95 break;
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96 case EVENT_CLICKUP:
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97 /*
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98 * If the button was pressed, indicate that the button is
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99 * finally activated. This let the user to move the cursor
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100 * outside the button to "forget" the press.
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101 */
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102 if (!is_boxed(button, &ev->click))
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103 button->state = BUTTON_STATE_NONE;
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104 else if (button->state == BUTTON_STATE_PRESSED)
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105 button->state = BUTTON_STATE_ACTIVATED;
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106 break;
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107 default:
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108 break;
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109 }
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110 }
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111
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112 void
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113 button_reset(struct button *button)
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114 {
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115 assert(button);
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116
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117 button->state = BUTTON_STATE_NONE;
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118 }
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119
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120 void
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121 button_draw(struct button *button)
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122 {
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123 assert(button);
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124
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125 theme_draw_button(button->theme, button);
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126 }
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127
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128 void
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129 button_action(struct button *button, struct action *act)
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130 {
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131 assert(button);
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132 assert(act);
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133
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134 memset(act, 0, sizeof (*act));
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135 act->data = button;
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136 act->handle = handle;
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137 act->draw = draw;
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138 }