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annotate include/SDL_keyboard.h @ 2288:e9bcf004c324

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Merged fix for bug #482 from SDL 1.2 revision 3492.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 29 Dec 2007 20:13:23 +0000
parents 4baee598306d
children d87417504c75
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /**
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24 * \file SDL_keyboard.h
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25 *
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26 * Include file for SDL keyboard event handling
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27 */
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28
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29 #ifndef _SDL_keyboard_h
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30 #define _SDL_keyboard_h
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31
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32 #include "SDL_stdinc.h"
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33 #include "SDL_error.h"
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34 #include "SDL_keysym.h"
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35
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36 #include "begin_code.h"
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37 /* Set up for C function definitions, even when using C++ */
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38 #ifdef __cplusplus
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39 /* *INDENT-OFF* */
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40 extern "C" {
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41 /* *INDENT-ON* */
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42 #endif
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43
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44 /**
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45 * \struct SDL_keysym
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46 *
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47 * \brief The SDL keysym structure, used in key events.
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48 */
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49 typedef struct SDL_keysym
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50 {
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51 Uint8 scancode; /**< keyboard specific scancode */
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52 Uint8 padding[3]; /**< alignment padding */
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53 SDLKey sym; /**< SDL virtual key code - see ::SDLKey for details */
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54 Uint16 mod; /**< current key modifiers */
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55 Uint32 unicode; /**< OBSOLETE, use SDL_TextInputEvent instead */
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56 } SDL_keysym;
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57
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58 /* Function prototypes */
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59
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60 /**
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61 * \fn int SDL_GetNumKeyboards(void)
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62 *
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63 * \brief Get the number of keyboard input devices available.
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64 *
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65 * \sa SDL_SelectKeyboard()
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66 */
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67 extern DECLSPEC int SDLCALL SDL_GetNumKeyboards(void);
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68
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69 /**
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70 * \fn int SDL_SelectKeyboard(int index)
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71 *
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72 * \brief Set the index of the currently selected keyboard.
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73 *
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74 * \return The index of the previously selected keyboard.
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75 *
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76 * \note You can query the currently selected keyboard by passing an index of -1.
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77 *
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78 * \sa SDL_GetNumKeyboards()
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79 */
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80 extern DECLSPEC int SDLCALL SDL_SelectKeyboard(int index);
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81
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82 /**
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83 * \fn int SDL_EnableUNICODE(int enable)
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84 *
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85 * \brief Enable/Disable UNICODE translation of keyboard input.
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86 *
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87 * \param enable 1 to enable translation, 0 to disable translation, -1 to query translation
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88 *
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89 * \return The previous state of keyboard translation
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90 *
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91 * \note This translation has some overhead, so translation defaults off.
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92 */
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93 extern DECLSPEC int SDLCALL SDL_EnableUNICODE(int enable);
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94
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95 /**
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96 * \fn Uint8 *SDL_GetKeyState(int *numkeys)
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97 *
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98 * \brief Get a snapshot of the current state of the selected keyboard.
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99 *
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100 * \param numkeys if non-NULL, receives the length of the returned array.
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101 *
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102 * \return An array of key states. Indexes into this array are obtained by using the SDLK_INDEX() macro on the \link ::SDLPhysicalKey SDLK_* \endlink syms.
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103 *
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104 * Example:
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105 * Uint8 *keystate = SDL_GetKeyState(NULL);
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106 * if ( keystate[SDLK_INDEX(SDLK_RETURN)] ) ... <RETURN> is pressed.
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107 */
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108 extern DECLSPEC Uint8 *SDLCALL SDL_GetKeyState(int *numkeys);
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109
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110 /**
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111 * \fn SDLMod SDL_GetModState(void)
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112 *
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113 * \brief Get the current key modifier state for the selected keyboard.
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114 */
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115 extern DECLSPEC SDLMod SDLCALL SDL_GetModState(void);
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116
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117 /**
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118 * \fn void SDL_SetModState(SDLMod modstate)
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119 *
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120 * \brief Set the current key modifier state for the selected keyboard.
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121 *
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122 * \note This does not change the keyboard state, only the key modifier flags.
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123 */
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124 extern DECLSPEC void SDLCALL SDL_SetModState(SDLMod modstate);
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125
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126 /**
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127 * \fn SDLKey SDL_GetLayoutKey(SDLKey physicalKey)
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128 *
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129 * \brief Get the layout key code corresponding to the given physical key code according to the current keyboard layout.
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130 *
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131 * See ::SDLKey for details.
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132 *
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133 * If \a physicalKey is not a physical key code, it is returned unchanged.
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134 *
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135 * \sa SDL_GetKeyName()
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136 */
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137 extern DECLSPEC SDLKey SDLCALL SDL_GetLayoutKey(SDLKey physicalKey);
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138
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139 /**
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140 * \fn const char *SDL_GetKeyName(SDLKey layoutKey)
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141 *
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142 * \brief Get a human-readable name for a key.
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143 *
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144 * \param layoutKey An SDL layout key code.
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145 *
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146 * If what you have is a physical key code, e.g. from the \link SDL_keysym::sym key.keysym.sym \endlink field of the SDL_Event structure, convert it to a layout key code using SDL_GetLayoutKey() first. Doing this ensures that the returned name matches what users see on their keyboards. Calling this function directly on a physical key code (that is not also a layout key code) is possible, but is not recommended except for debugging purposes. The name returned in that case is the name of the \link ::SDLPhysicalKey SDLK_* \endlink constant and is not suitable for display to users.
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147 *
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148 * \return A pointer to a UTF-8 string that stays valid at least until the next call to this function. If you need it around any longer, you must copy it. Always non-NULL.
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149 *
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150 * \sa SDLKey
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151 */
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152 extern DECLSPEC const char *SDLCALL SDL_GetKeyName(SDLKey layoutKey);
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153
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154
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155 /* Ends C function definitions when using C++ */
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156 #ifdef __cplusplus
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157 /* *INDENT-OFF* */
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158 }
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159 /* *INDENT-ON* */
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160 #endif
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161 #include "close_code.h"
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162
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163 #endif /* _SDL_keyboard_h */
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164
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165 /* vi: set ts=4 sw=4 expandtab: */