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annotate libui/ui/theme.h @ 148:c577c15df07f

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misc: split libraries, closes #2496
author David Demelier <markand@malikania.fr>
date Thu, 15 Oct 2020 10:32:18 +0200
parents libcore/core/theme.h@b386d25832c8
children b19d076856d2
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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 */
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26
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27 #include <stdbool.h>
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28
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29 struct checkbox;
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30 struct button;
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31 struct font;
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32 struct frame;
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33 struct label;
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34
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35 /**
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36 * \brief Font component.
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37 */
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38 enum theme_font {
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39 THEME_FONT_DEBUG, /*!< Font for debug messages. */
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40 THEME_FONT_INTERFACE, /*!< Font for interface elements. */
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41 THEME_FONT_LAST /*!< Unused. */
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42 };
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43
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44 /**
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45 * \brief Theme colors.
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46 */
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47 enum theme_color {
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48 THEME_COLOR_DEBUG, /*!< Debug color font. */
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49 THEME_COLOR_NORMAL, /*!< Normal font color. */
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50 THEME_COLOR_SELECTED, /*!< Font color for selected elements. */
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51 THEME_COLOR_SHADOW, /*!< Shadow color. */
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52 THEME_COLOR_LAST /*!< Unused. */
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53 };
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54
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55 /**
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56 * \brief Abstract theme structure.
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57 */
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58 struct theme {
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59 /**
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60 * (+&) Fonts catalog.
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61 */
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62 struct font *fonts[THEME_FONT_LAST];
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63
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64 /**
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65 * (+) Miscellaneous colors.
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66 */
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67 unsigned long colors[THEME_COLOR_LAST];
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68
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69 /**
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70 * (+) Padding between GUI elements.
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71 */
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72 unsigned int padding;
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73
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74 /**
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75 * (+) Draw a frame.
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76 *
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77 * This function is used to draw a box usually as a container where UI
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78 * elements will be put.
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79 *
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80 * \see \ref theme_draw_frame
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81 */
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82 void (*draw_frame)(struct theme *, const struct frame *);
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83
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84 /**
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85 * (+) Draw a label.
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86 *
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87 * \see \ref theme_draw_label
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88 */
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89 void (*draw_label)(struct theme *, const struct label *);
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90
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91 /**
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92 * (+) Draw a button.
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93 *
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94 * \see \ref theme_draw_button
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95 */
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96 void (*draw_button)(struct theme *, const struct button *);
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97
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98 /**
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99 * (+) Draw a checkbox.
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100 *
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101 * \see \ref theme_draw_button
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102 */
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103 void (*draw_checkbox)(struct theme *t, const struct checkbox *);
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104 };
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105
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106 /**
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107 * Initialize the theming system.
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108 *
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109 * \return false on errors
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110 * \warning This function must be called before any other theme functions.
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111 */
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112 bool
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113 theme_init(void);
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114
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115 /**
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116 * Get a reference to the default theme.
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117 *
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118 * \return A non-owning pointer to a static storage for the default theme
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119 */
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120 struct theme *
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121 theme_default(void);
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122
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123 /**
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124 * Convenient shortcut to shallow copy src into dst.
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125 *
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126 * Use this function when you want your own local copy of a theme because you
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127 * want to modify some attributes.
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128 *
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129 * This is a shortcut to `memcpy(dst, src, sizeof (*src))`.
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130 *
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131 * \pre dst != NULL
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132 * \param dst the destination theme
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133 * \param src the source theme (may be NULL)
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134 * \note Resources are not cloned, internal pointers will adress the same
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135 * regions.
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136 */
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137 void
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138 theme_shallow(struct theme *dst, const struct theme *src);
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139
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140 /**
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141 * Get the desired padding between GUI elements.
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142 *
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143 * \param t the theme to use (may be NULL)
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144 * \return the padding in pixels
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145 */
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146 unsigned int
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147 theme_padding(const struct theme *t);
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148
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149 /**
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150 * Draw a frame.
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151 *
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152 * \pre frame != NULL
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153 * \param t the theme to use (may be NULL)
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154 * \param frame the frame
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155 */
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156 void
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157 theme_draw_frame(struct theme *t, const struct frame *frame);
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158
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159 /**
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160 * Draw a label.
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161 *
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162 * \pre label != NULL
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163 * \param t the theme to use (may be NULL)
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164 * \param label the label
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165 */
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166 void
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167 theme_draw_label(struct theme *t, const struct label *label);
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168
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169 /**
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170 * Draw a button.
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171 *
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172 * \pre button != NULL
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173 * \param t the theme to use (may be NULL)
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174 * \param button the button
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175 */
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176 void
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177 theme_draw_button(struct theme *t, const struct button *button);
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178
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179 /**
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180 * Draw a checkbox.
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181 *
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182 * \param t the theme to use (may be NULL)
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183 * \param cb the checkbox
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184 */
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185 void
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186 theme_draw_checkbox(struct theme *t, const struct checkbox *cb);
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187
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188 /**
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189 * Close associated resources.
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190 */
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191 void
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192 theme_finish(void);
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193
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194 #endif /* !MOLKO_THEME_H */