1 /* |
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2 SDL - Simple DirectMedia Layer |
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3 Copyright (C) 1997-2012 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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18 |
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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_events.h |
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25 * Include file for SDL event handling |
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26 */ |
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27 |
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28 #ifndef _SDL_events_h |
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29 #define _SDL_events_h |
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30 |
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31 #include "SDL_stdinc.h" |
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32 #include "SDL_error.h" |
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33 #include "SDL_active.h" |
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34 #include "SDL_keyboard.h" |
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35 #include "SDL_mouse.h" |
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36 #include "SDL_joystick.h" |
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37 #include "SDL_quit.h" |
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38 |
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39 #include "begin_code.h" |
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40 /* Set up for C function definitions, even when using C++ */ |
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41 #ifdef __cplusplus |
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42 extern "C" { |
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43 #endif |
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44 |
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45 /** @name General keyboard/mouse state definitions */ |
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46 /*@{*/ |
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47 #define SDL_RELEASED 0 |
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48 #define SDL_PRESSED 1 |
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49 /*@}*/ |
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50 |
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51 /** Event enumerations */ |
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52 typedef enum { |
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53 SDL_NOEVENT = 0, /**< Unused (do not remove) */ |
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54 SDL_ACTIVEEVENT, /**< Application loses/gains visibility */ |
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55 SDL_KEYDOWN, /**< Keys pressed */ |
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56 SDL_KEYUP, /**< Keys released */ |
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57 SDL_MOUSEMOTION, /**< Mouse moved */ |
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58 SDL_MOUSEBUTTONDOWN, /**< Mouse button pressed */ |
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59 SDL_MOUSEBUTTONUP, /**< Mouse button released */ |
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60 SDL_JOYAXISMOTION, /**< Joystick axis motion */ |
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61 SDL_JOYBALLMOTION, /**< Joystick trackball motion */ |
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62 SDL_JOYHATMOTION, /**< Joystick hat position change */ |
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63 SDL_JOYBUTTONDOWN, /**< Joystick button pressed */ |
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64 SDL_JOYBUTTONUP, /**< Joystick button released */ |
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65 SDL_QUIT, /**< User-requested quit */ |
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66 SDL_SYSWMEVENT, /**< System specific event */ |
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67 SDL_EVENT_RESERVEDA, /**< Reserved for future use.. */ |
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68 SDL_EVENT_RESERVEDB, /**< Reserved for future use.. */ |
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69 SDL_VIDEORESIZE, /**< User resized video mode */ |
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70 SDL_VIDEOEXPOSE, /**< Screen needs to be redrawn */ |
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71 SDL_EVENT_RESERVED2, /**< Reserved for future use.. */ |
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72 SDL_EVENT_RESERVED3, /**< Reserved for future use.. */ |
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73 SDL_EVENT_RESERVED4, /**< Reserved for future use.. */ |
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74 SDL_EVENT_RESERVED5, /**< Reserved for future use.. */ |
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75 SDL_EVENT_RESERVED6, /**< Reserved for future use.. */ |
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76 SDL_EVENT_RESERVED7, /**< Reserved for future use.. */ |
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77 /** Events SDL_USEREVENT through SDL_MAXEVENTS-1 are for your use */ |
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78 SDL_USEREVENT = 24, |
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79 /** This last event is only for bounding internal arrays |
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80 * It is the number of bits in the event mask datatype -- Uint32 |
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81 */ |
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82 SDL_NUMEVENTS = 32 |
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83 } SDL_EventType; |
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84 |
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85 /** @name Predefined event masks */ |
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86 /*@{*/ |
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87 #define SDL_EVENTMASK(X) (1<<(X)) |
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88 typedef enum { |
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89 SDL_ACTIVEEVENTMASK = SDL_EVENTMASK(SDL_ACTIVEEVENT), |
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90 SDL_KEYDOWNMASK = SDL_EVENTMASK(SDL_KEYDOWN), |
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91 SDL_KEYUPMASK = SDL_EVENTMASK(SDL_KEYUP), |
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92 SDL_KEYEVENTMASK = SDL_EVENTMASK(SDL_KEYDOWN)| |
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93 SDL_EVENTMASK(SDL_KEYUP), |
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94 SDL_MOUSEMOTIONMASK = SDL_EVENTMASK(SDL_MOUSEMOTION), |
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95 SDL_MOUSEBUTTONDOWNMASK = SDL_EVENTMASK(SDL_MOUSEBUTTONDOWN), |
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96 SDL_MOUSEBUTTONUPMASK = SDL_EVENTMASK(SDL_MOUSEBUTTONUP), |
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97 SDL_MOUSEEVENTMASK = SDL_EVENTMASK(SDL_MOUSEMOTION)| |
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98 SDL_EVENTMASK(SDL_MOUSEBUTTONDOWN)| |
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99 SDL_EVENTMASK(SDL_MOUSEBUTTONUP), |
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100 SDL_JOYAXISMOTIONMASK = SDL_EVENTMASK(SDL_JOYAXISMOTION), |
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101 SDL_JOYBALLMOTIONMASK = SDL_EVENTMASK(SDL_JOYBALLMOTION), |
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102 SDL_JOYHATMOTIONMASK = SDL_EVENTMASK(SDL_JOYHATMOTION), |
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103 SDL_JOYBUTTONDOWNMASK = SDL_EVENTMASK(SDL_JOYBUTTONDOWN), |
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104 SDL_JOYBUTTONUPMASK = SDL_EVENTMASK(SDL_JOYBUTTONUP), |
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105 SDL_JOYEVENTMASK = SDL_EVENTMASK(SDL_JOYAXISMOTION)| |
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106 SDL_EVENTMASK(SDL_JOYBALLMOTION)| |
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107 SDL_EVENTMASK(SDL_JOYHATMOTION)| |
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108 SDL_EVENTMASK(SDL_JOYBUTTONDOWN)| |
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109 SDL_EVENTMASK(SDL_JOYBUTTONUP), |
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110 SDL_VIDEORESIZEMASK = SDL_EVENTMASK(SDL_VIDEORESIZE), |
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111 SDL_VIDEOEXPOSEMASK = SDL_EVENTMASK(SDL_VIDEOEXPOSE), |
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112 SDL_QUITMASK = SDL_EVENTMASK(SDL_QUIT), |
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113 SDL_SYSWMEVENTMASK = SDL_EVENTMASK(SDL_SYSWMEVENT) |
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114 } SDL_EventMask ; |
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115 #define SDL_ALLEVENTS 0xFFFFFFFF |
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116 /*@}*/ |
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117 |
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118 /** Application visibility event structure */ |
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119 typedef struct SDL_ActiveEvent { |
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120 Uint8 type; /**< SDL_ACTIVEEVENT */ |
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121 Uint8 gain; /**< Whether given states were gained or lost (1/0) */ |
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122 Uint8 state; /**< A mask of the focus states */ |
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123 } SDL_ActiveEvent; |
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124 |
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125 /** Keyboard event structure */ |
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126 typedef struct SDL_KeyboardEvent { |
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127 Uint8 type; /**< SDL_KEYDOWN or SDL_KEYUP */ |
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128 Uint8 which; /**< The keyboard device index */ |
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129 Uint8 state; /**< SDL_PRESSED or SDL_RELEASED */ |
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130 SDL_keysym keysym; |
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131 } SDL_KeyboardEvent; |
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132 |
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133 /** Mouse motion event structure */ |
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134 typedef struct SDL_MouseMotionEvent { |
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135 Uint8 type; /**< SDL_MOUSEMOTION */ |
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136 Uint8 which; /**< The mouse device index */ |
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137 Uint8 state; /**< The current button state */ |
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138 Uint16 x, y; /**< The X/Y coordinates of the mouse */ |
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139 Sint16 xrel; /**< The relative motion in the X direction */ |
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140 Sint16 yrel; /**< The relative motion in the Y direction */ |
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141 } SDL_MouseMotionEvent; |
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142 |
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143 /** Mouse button event structure */ |
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144 typedef struct SDL_MouseButtonEvent { |
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145 Uint8 type; /**< SDL_MOUSEBUTTONDOWN or SDL_MOUSEBUTTONUP */ |
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146 Uint8 which; /**< The mouse device index */ |
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147 Uint8 button; /**< The mouse button index */ |
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148 Uint8 state; /**< SDL_PRESSED or SDL_RELEASED */ |
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149 Uint16 x, y; /**< The X/Y coordinates of the mouse at press time */ |
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150 } SDL_MouseButtonEvent; |
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151 |
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152 /** Joystick axis motion event structure */ |
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153 typedef struct SDL_JoyAxisEvent { |
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154 Uint8 type; /**< SDL_JOYAXISMOTION */ |
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155 Uint8 which; /**< The joystick device index */ |
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156 Uint8 axis; /**< The joystick axis index */ |
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157 Sint16 value; /**< The axis value (range: -32768 to 32767) */ |
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158 } SDL_JoyAxisEvent; |
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159 |
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160 /** Joystick trackball motion event structure */ |
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161 typedef struct SDL_JoyBallEvent { |
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162 Uint8 type; /**< SDL_JOYBALLMOTION */ |
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163 Uint8 which; /**< The joystick device index */ |
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164 Uint8 ball; /**< The joystick trackball index */ |
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165 Sint16 xrel; /**< The relative motion in the X direction */ |
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166 Sint16 yrel; /**< The relative motion in the Y direction */ |
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167 } SDL_JoyBallEvent; |
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168 |
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169 /** Joystick hat position change event structure */ |
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170 typedef struct SDL_JoyHatEvent { |
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171 Uint8 type; /**< SDL_JOYHATMOTION */ |
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172 Uint8 which; /**< The joystick device index */ |
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173 Uint8 hat; /**< The joystick hat index */ |
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174 Uint8 value; /**< The hat position value: |
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175 * SDL_HAT_LEFTUP SDL_HAT_UP SDL_HAT_RIGHTUP |
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176 * SDL_HAT_LEFT SDL_HAT_CENTERED SDL_HAT_RIGHT |
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177 * SDL_HAT_LEFTDOWN SDL_HAT_DOWN SDL_HAT_RIGHTDOWN |
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178 * Note that zero means the POV is centered. |
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179 */ |
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180 } SDL_JoyHatEvent; |
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181 |
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182 /** Joystick button event structure */ |
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183 typedef struct SDL_JoyButtonEvent { |
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184 Uint8 type; /**< SDL_JOYBUTTONDOWN or SDL_JOYBUTTONUP */ |
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185 Uint8 which; /**< The joystick device index */ |
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186 Uint8 button; /**< The joystick button index */ |
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187 Uint8 state; /**< SDL_PRESSED or SDL_RELEASED */ |
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188 } SDL_JoyButtonEvent; |
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189 |
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190 /** The "window resized" event |
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191 * When you get this event, you are responsible for setting a new video |
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192 * mode with the new width and height. |
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193 */ |
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194 typedef struct SDL_ResizeEvent { |
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195 Uint8 type; /**< SDL_VIDEORESIZE */ |
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196 int w; /**< New width */ |
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197 int h; /**< New height */ |
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198 } SDL_ResizeEvent; |
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199 |
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200 /** The "screen redraw" event */ |
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201 typedef struct SDL_ExposeEvent { |
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202 Uint8 type; /**< SDL_VIDEOEXPOSE */ |
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203 } SDL_ExposeEvent; |
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204 |
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205 /** The "quit requested" event */ |
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206 typedef struct SDL_QuitEvent { |
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207 Uint8 type; /**< SDL_QUIT */ |
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208 } SDL_QuitEvent; |
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209 |
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210 /** A user-defined event type */ |
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211 typedef struct SDL_UserEvent { |
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212 Uint8 type; /**< SDL_USEREVENT through SDL_NUMEVENTS-1 */ |
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213 int code; /**< User defined event code */ |
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214 void *data1; /**< User defined data pointer */ |
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215 void *data2; /**< User defined data pointer */ |
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216 } SDL_UserEvent; |
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217 |
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218 /** If you want to use this event, you should include SDL_syswm.h */ |
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219 struct SDL_SysWMmsg; |
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220 typedef struct SDL_SysWMmsg SDL_SysWMmsg; |
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221 typedef struct SDL_SysWMEvent { |
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222 Uint8 type; |
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223 SDL_SysWMmsg *msg; |
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224 } SDL_SysWMEvent; |
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225 |
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226 /** General event structure */ |
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227 typedef union SDL_Event { |
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228 Uint8 type; |
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229 SDL_ActiveEvent active; |
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230 SDL_KeyboardEvent key; |
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231 SDL_MouseMotionEvent motion; |
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232 SDL_MouseButtonEvent button; |
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233 SDL_JoyAxisEvent jaxis; |
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234 SDL_JoyBallEvent jball; |
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235 SDL_JoyHatEvent jhat; |
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236 SDL_JoyButtonEvent jbutton; |
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237 SDL_ResizeEvent resize; |
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238 SDL_ExposeEvent expose; |
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239 SDL_QuitEvent quit; |
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240 SDL_UserEvent user; |
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241 SDL_SysWMEvent syswm; |
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242 } SDL_Event; |
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243 |
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244 |
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245 /* Function prototypes */ |
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246 |
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247 /** Pumps the event loop, gathering events from the input devices. |
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248 * This function updates the event queue and internal input device state. |
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249 * This should only be run in the thread that sets the video mode. |
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250 */ |
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251 extern DECLSPEC void SDLCALL SDL_PumpEvents(void); |
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252 |
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253 typedef enum { |
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254 SDL_ADDEVENT, |
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255 SDL_PEEKEVENT, |
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256 SDL_GETEVENT |
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257 } SDL_eventaction; |
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258 |
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259 /** |
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260 * Checks the event queue for messages and optionally returns them. |
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261 * |
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262 * If 'action' is SDL_ADDEVENT, up to 'numevents' events will be added to |
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263 * the back of the event queue. |
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264 * If 'action' is SDL_PEEKEVENT, up to 'numevents' events at the front |
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265 * of the event queue, matching 'mask', will be returned and will not |
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266 * be removed from the queue. |
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267 * If 'action' is SDL_GETEVENT, up to 'numevents' events at the front |
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268 * of the event queue, matching 'mask', will be returned and will be |
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269 * removed from the queue. |
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270 * |
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271 * @return |
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272 * This function returns the number of events actually stored, or -1 |
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273 * if there was an error. |
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274 * |
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275 * This function is thread-safe. |
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276 */ |
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277 extern DECLSPEC int SDLCALL SDL_PeepEvents(SDL_Event *events, int numevents, |
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278 SDL_eventaction action, Uint32 mask); |
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279 |
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280 /** Polls for currently pending events, and returns 1 if there are any pending |
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281 * events, or 0 if there are none available. If 'event' is not NULL, the next |
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282 * event is removed from the queue and stored in that area. |
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283 */ |
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284 extern DECLSPEC int SDLCALL SDL_PollEvent(SDL_Event *event); |
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285 |
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286 /** Waits indefinitely for the next available event, returning 1, or 0 if there |
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287 * was an error while waiting for events. If 'event' is not NULL, the next |
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288 * event is removed from the queue and stored in that area. |
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289 */ |
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290 extern DECLSPEC int SDLCALL SDL_WaitEvent(SDL_Event *event); |
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291 |
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292 /** Add an event to the event queue. |
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293 * This function returns 0 on success, or -1 if the event queue was full |
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294 * or there was some other error. |
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295 */ |
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296 extern DECLSPEC int SDLCALL SDL_PushEvent(SDL_Event *event); |
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297 |
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298 /** @name Event Filtering */ |
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299 /*@{*/ |
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300 typedef int (SDLCALL *SDL_EventFilter)(const SDL_Event *event); |
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301 /** |
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302 * This function sets up a filter to process all events before they |
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303 * change internal state and are posted to the internal event queue. |
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304 * |
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305 * The filter is protypted as: |
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306 * @code typedef int (SDLCALL *SDL_EventFilter)(const SDL_Event *event); @endcode |
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307 * |
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308 * If the filter returns 1, then the event will be added to the internal queue. |
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309 * If it returns 0, then the event will be dropped from the queue, but the |
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310 * internal state will still be updated. This allows selective filtering of |
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311 * dynamically arriving events. |
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312 * |
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313 * @warning Be very careful of what you do in the event filter function, as |
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314 * it may run in a different thread! |
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315 * |
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316 * There is one caveat when dealing with the SDL_QUITEVENT event type. The |
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317 * event filter is only called when the window manager desires to close the |
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318 * application window. If the event filter returns 1, then the window will |
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319 * be closed, otherwise the window will remain open if possible. |
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320 * If the quit event is generated by an interrupt signal, it will bypass the |
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321 * internal queue and be delivered to the application at the next event poll. |
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322 */ |
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323 extern DECLSPEC void SDLCALL SDL_SetEventFilter(SDL_EventFilter filter); |
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324 |
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325 /** |
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326 * Return the current event filter - can be used to "chain" filters. |
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327 * If there is no event filter set, this function returns NULL. |
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328 */ |
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329 extern DECLSPEC SDL_EventFilter SDLCALL SDL_GetEventFilter(void); |
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330 /*@}*/ |
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331 |
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332 /** @name Event State */ |
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333 /*@{*/ |
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334 #define SDL_QUERY -1 |
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335 #define SDL_IGNORE 0 |
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336 #define SDL_DISABLE 0 |
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337 #define SDL_ENABLE 1 |
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338 /*@}*/ |
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339 |
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340 /** |
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341 * This function allows you to set the state of processing certain events. |
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342 * If 'state' is set to SDL_IGNORE, that event will be automatically dropped |
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343 * from the event queue and will not event be filtered. |
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344 * If 'state' is set to SDL_ENABLE, that event will be processed normally. |
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345 * If 'state' is set to SDL_QUERY, SDL_EventState() will return the |
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346 * current processing state of the specified event. |
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347 */ |
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348 extern DECLSPEC Uint8 SDLCALL SDL_EventState(Uint8 type, int state); |
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349 |
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350 /* Ends C function definitions when using C++ */ |
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351 #ifdef __cplusplus |
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352 } |
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353 #endif |
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354 #include "close_code.h" |
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355 |
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356 #endif /* _SDL_events_h */ |
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