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annotate libmlk-ui/mlk/ui/button.c @ 507:d49a05e7a5b5

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ui: separate delegate/style Now UI elements do have different styling properties: - _delegate: functions used to update, draw or perform specific actions on the UI element. - _style: basic properties that the delegate should support if possible.
author David Demelier <markand@malikania.fr>
date Thu, 02 Mar 2023 21:36:43 +0100
parents 6100c643dba0
children 7e7c6786d21e
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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) 2020-2023 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 <mlk/core/event.h>
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23 #include <mlk/core/maths.h>
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24 #include <mlk/core/painter.h>
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25 #include <mlk/core/trace.h>
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27 #include "align.h"
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28 #include "button.h"
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29 #include "ui.h"
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30 #include "ui_p.h"
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31
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32 static inline int
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33 is_boxed(const struct mlk_button *button, const struct mlk_event_click *click)
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34 {
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35 assert(button);
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36 assert(click);
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37 assert(click->type == MLK_EVENT_CLICKDOWN || click->type == MLK_EVENT_CLICKUP);
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38
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39 return mlk_maths_is_boxed(button->x, button->y, button->w, button->h,
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40 click->x, click->y);
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41 }
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42
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43 static inline struct mlk_font *
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44 style_font(const struct mlk_button *button)
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45 {
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46 const struct mlk_button_style *style = MLK__STYLE(button, mlk_button_style);
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47
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48 if (style->text_font)
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49 return style->text_font;
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50
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51 return mlk_ui_fonts[MLK_UI_FONT_INTERFACE];
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52 }
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53
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54 static void
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55 delegate_draw_frame(struct mlk_button_delegate *delegate, const struct mlk_button *button)
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56 {
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57 (void)delegate;
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58
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59 const struct mlk_button_style *style = MLK__STYLE(button, mlk_button_style);
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60
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61 mlk_painter_set_color(style->border_color);
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62 mlk_painter_draw_rectangle(button->x, button->y, button->w, button->h);
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63 mlk_painter_set_color(style->bg_color);
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64 mlk_painter_draw_rectangle(
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65 button->x + style->border_size,
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66 button->y + style->border_size,
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67 button->w - (style->border_size * 2),
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68 button->h - (style->border_size * 2)
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69 );
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70 }
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71
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72 static void
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73 delegate_draw_text(struct mlk_button_delegate *delegate, const struct mlk_button *button)
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74 {
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75 (void)delegate;
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76
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77 const struct mlk_button_style *style = MLK__STYLE(button, mlk_button_style);
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78
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79 mlk_ui_draw_text(
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80 MLK_ALIGN_CENTER,
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81 style_font(button),
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82 style->text_color,
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83 button->text,
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84 button->x,
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85 button->y,
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86 button->w,
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87 button->h
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88 );
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89 }
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90
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91 struct mlk_button_style mlk_button_style = {
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92 .bg_color = MLK_UI_COLOR_BG,
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93 .text_color = MLK_UI_COLOR_TEXT,
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94 .border_color = MLK_UI_COLOR_BORDER,
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95 .border_size = 1
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96 };
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97
507
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98 struct mlk_button_delegate mlk_button_delegate = {
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99 .draw_frame = delegate_draw_frame,
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100 .draw_text = delegate_draw_text
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101 };
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102
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103 int
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104 mlk_button_ok(const struct mlk_button *button)
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105 {
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106 if (!button)
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107 return 0;
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108 if (button->text && strlen(button->text) == 0)
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109 return 0;
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110
507
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111 return 1;
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112 }
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113
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114 int
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115 mlk_button_handle(struct mlk_button *button, const union mlk_event *ev)
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116 {
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117 assert(button);
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118 assert(ev);
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119
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120 int active = 0;
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121
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122 switch (ev->type) {
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123 case MLK_EVENT_CLICKDOWN:
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124 if (is_boxed(button, &ev->click))
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125 button->pressed = 1;
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126 break;
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127 case MLK_EVENT_CLICKUP:
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128 /*
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129 * If the button was pressed, indicate that the button is
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130 * finally activated. This let the user to move the cursor
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131 * outside the button to "forget" the press.
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132 */
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133 button->pressed = 0;
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134
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135 if (is_boxed(button, &ev->click))
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136 active = 1;
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137 break;
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138 default:
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139 break;
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140 }
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141
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142 return active;
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143 }
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144
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145 void
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146 mlk_button_update(struct mlk_button *button, unsigned int ticks)
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147 {
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148 assert(button);
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149
507
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150 MLK__DELEGATE_INVOKE(button->delegate, mlk_button_delegate, update, button, ticks);
99
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151 }
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152
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153 void
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154 mlk_button_draw(const struct mlk_button *button)
99
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155 {
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156 assert(button);
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157
507
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158 MLK__DELEGATE_INVOKE(button->delegate, mlk_button_delegate, draw_frame, button);
502
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159
507
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160 if (button->text)
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161 MLK__DELEGATE_INVOKE(button->delegate, mlk_button_delegate, draw_text, button);
502
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162 }