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annotate libui/ui/theme.h @ 156:c3a40062acc2

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misc: create more generic startup function, closes #2500
author David Demelier <markand@malikania.fr>
date Fri, 16 Oct 2020 13:54:31 +0200
parents 1008a796a9e7
children 6992085d47fd
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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 * This function is automatically called from \ref ui_init and thus not
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111 * necessary from user.
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112 *
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113 * \return False on error.
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114 */
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115 bool
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116 theme_init(void);
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117
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118 /**
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119 * Get a reference to the default theme.
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120 *
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121 * \return A non-owning pointer to a static storage for the default theme
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122 */
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123 struct theme *
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124 theme_default(void);
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125
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126 /**
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127 * Convenient shortcut to shallow copy src into dst.
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128 *
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129 * Use this function when you want your own local copy of a theme because you
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130 * want to modify some attributes.
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131 *
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132 * This is a shortcut to `memcpy(dst, src, sizeof (*src))`.
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133 *
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134 * \pre dst != NULL
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135 * \param dst the destination theme
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136 * \param src the source theme (may be NULL)
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137 * \note Resources are not cloned, internal pointers will adress the same
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138 * regions.
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139 */
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140 void
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141 theme_shallow(struct theme *dst, const struct theme *src);
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142
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143 /**
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144 * Draw a frame.
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145 *
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146 * \pre frame != NULL
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147 * \param t the theme to use (may be NULL)
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148 * \param frame the frame
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149 */
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150 void
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151 theme_draw_frame(struct theme *t, const struct frame *frame);
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152
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153 /**
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154 * Draw a label.
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155 *
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156 * \pre label != NULL
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157 * \param t the theme to use (may be NULL)
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158 * \param label the label
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159 */
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160 void
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161 theme_draw_label(struct theme *t, const struct label *label);
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162
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163 /**
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164 * Draw a button.
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165 *
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166 * \pre button != NULL
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167 * \param t the theme to use (may be NULL)
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168 * \param button the button
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169 */
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170 void
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171 theme_draw_button(struct theme *t, const struct button *button);
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172
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173 /**
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174 * Draw a checkbox.
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175 *
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176 * \param t the theme to use (may be NULL)
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177 * \param cb the checkbox
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178 */
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179 void
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180 theme_draw_checkbox(struct theme *t, const struct checkbox *cb);
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181
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182 /**
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183 * This function is automatically called from \ref ui_finish and thus not
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184 * necessary from user.
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185 */
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186 void
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187 theme_finish(void);
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188
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189 #endif /* !MOLKO_THEME_H */