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annotate libui/ui/theme.h @ 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 c3a40062acc2
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1 /*
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2 * theme.h -- abstract theming
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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 #ifndef MOLKO_THEME_H
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20 #define MOLKO_THEME_H
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21
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22 /**
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23 * \file theme.h
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24 * \brief Abstract theming.
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25 * \ingroup ui
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26 */
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27
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28 #include <stdbool.h>
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29
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30 struct checkbox;
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31 struct button;
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32 struct font;
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33 struct frame;
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34 struct label;
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35
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36 /**
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37 * \brief Font component.
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38 */
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39 enum theme_font {
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40 THEME_FONT_DEBUG, /*!< Font for debug messages. */
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41 THEME_FONT_INTERFACE, /*!< Font for interface elements. */
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42 THEME_FONT_LAST /*!< Unused. */
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43 };
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44
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45 /**
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46 * \brief Theme colors.
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47 */
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48 enum theme_color {
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49 THEME_COLOR_DEBUG, /*!< Debug color font. */
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50 THEME_COLOR_NORMAL, /*!< Normal font color. */
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51 THEME_COLOR_SELECTED, /*!< Font color for selected elements. */
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52 THEME_COLOR_SHADOW, /*!< Shadow color. */
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53 THEME_COLOR_LAST /*!< Unused. */
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54 };
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55
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56 /**
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57 * \brief Abstract theme structure.
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58 */
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59 struct theme {
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60 /**
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61 * (+&) Fonts catalog.
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62 */
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63 struct font *fonts[THEME_FONT_LAST];
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64
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65 /**
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66 * (+) Miscellaneous colors.
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67 */
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68 unsigned long colors[THEME_COLOR_LAST];
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69
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70 /**
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71 * (+) Padding between GUI elements.
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72 */
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73 unsigned int padding;
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74
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75 /**
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76 * (+) Draw a frame.
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77 *
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78 * This function is used to draw a box usually as a container where UI
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79 * elements will be put.
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80 *
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81 * \see \ref theme_draw_frame
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82 */
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83 void (*draw_frame)(struct theme *, const struct frame *);
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84
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85 /**
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86 * (+) Draw a label.
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87 *
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88 * \see \ref theme_draw_label
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89 */
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90 void (*draw_label)(struct theme *, const struct label *);
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91
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92 /**
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93 * (+) Draw a button.
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94 *
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95 * \see \ref theme_draw_button
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96 */
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97 void (*draw_button)(struct theme *, const struct button *);
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98
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99 /**
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100 * (+) Draw a checkbox.
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101 *
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102 * \see \ref theme_draw_button
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103 */
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104 void (*draw_checkbox)(struct theme *t, const struct checkbox *);
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105 };
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106
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107 /**
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108 * Initialize the theming system.
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109 *
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110 * \return false on errors
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111 * \warning This function must be called before any other theme functions.
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112 */
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113 bool
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114 theme_init(void);
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115
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116 /**
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117 * Get a reference to the default theme.
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118 *
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119 * \return A non-owning pointer to a static storage for the default theme
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120 */
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121 struct theme *
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122 theme_default(void);
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123
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124 /**
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125 * Convenient shortcut to shallow copy src into dst.
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126 *
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127 * Use this function when you want your own local copy of a theme because you
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128 * want to modify some attributes.
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129 *
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130 * This is a shortcut to `memcpy(dst, src, sizeof (*src))`.
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131 *
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132 * \pre dst != NULL
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133 * \param dst the destination theme
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134 * \param src the source theme (may be NULL)
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135 * \note Resources are not cloned, internal pointers will adress the same
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136 * regions.
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137 */
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138 void
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139 theme_shallow(struct theme *dst, const struct theme *src);
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140
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141 /**
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142 * Draw a frame.
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143 *
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144 * \pre frame != NULL
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145 * \param t the theme to use (may be NULL)
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146 * \param frame the frame
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147 */
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148 void
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149 theme_draw_frame(struct theme *t, const struct frame *frame);
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150
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151 /**
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152 * Draw a label.
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153 *
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154 * \pre label != NULL
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155 * \param t the theme to use (may be NULL)
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156 * \param label the label
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157 */
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158 void
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159 theme_draw_label(struct theme *t, const struct label *label);
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160
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161 /**
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162 * Draw a button.
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163 *
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164 * \pre button != NULL
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165 * \param t the theme to use (may be NULL)
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166 * \param button the button
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167 */
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168 void
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169 theme_draw_button(struct theme *t, const struct button *button);
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170
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171 /**
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172 * Draw a checkbox.
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173 *
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174 * \param t the theme to use (may be NULL)
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175 * \param cb the checkbox
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176 */
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177 void
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178 theme_draw_checkbox(struct theme *t, const struct checkbox *cb);
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179
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180 /**
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181 * Close associated resources.
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182 */
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183 void
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184 theme_finish(void);
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185
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186 #endif /* !MOLKO_THEME_H */