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annotate include/SDL_events.h @ 4681:5378f2d0754f

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Fixed some Gesture bugs
author Jim Grandpre <jim.tla@gmail.com>
date Mon, 02 Aug 2010 00:14:53 -0400
parents f8431f66613d
children 15dfe42edbfd
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2010 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 *
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26 * Include file for SDL event handling.
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27 */
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28
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29 #ifndef _SDL_events_h
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30 #define _SDL_events_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_video.h"
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35 #include "SDL_keyboard.h"
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36 #include "SDL_mouse.h"
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37 #include "SDL_joystick.h"
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38 #include "SDL_quit.h"
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39 #include "SDL_gesture.h"
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40 #include "SDL_touch.h"
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41
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42 #include "begin_code.h"
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43 /* Set up for C function definitions, even when using C++ */
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44 #ifdef __cplusplus
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45 /* *INDENT-OFF* */
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46 extern "C" {
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47 /* *INDENT-ON* */
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48 #endif
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49
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50 /* General keyboard/mouse state definitions */
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51 #define SDL_RELEASED 0
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52 #define SDL_PRESSED 1
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53
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54 /**
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55 * \brief The types of events that can be delivered.
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56 */
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57 typedef enum
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58 {
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59 SDL_FIRSTEVENT = 0, /**< Unused (do not remove) */
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60
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61 /* Application events */
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62 SDL_QUIT = 0x100, /**< User-requested quit */
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63
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64 /* Window events */
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65 SDL_WINDOWEVENT = 0x200, /**< Window state change */
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66 SDL_SYSWMEVENT, /**< System specific event */
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67
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68 /* Keyboard events */
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69 SDL_KEYDOWN = 0x300, /**< Keys pressed */
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70 SDL_KEYUP, /**< Keys released */
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71 SDL_TEXTEDITING, /**< Keyboard text editing (composition) */
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72 SDL_TEXTINPUT, /**< Keyboard text input */
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73
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74 /* Mouse events */
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75 SDL_MOUSEMOTION = 0x400, /**< Mouse moved */
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76 SDL_MOUSEBUTTONDOWN, /**< Mouse button pressed */
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77 SDL_MOUSEBUTTONUP, /**< Mouse button released */
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78 SDL_MOUSEWHEEL, /**< Mouse wheel motion */
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79
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80 /* Tablet or multiple mice input device events */
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81 SDL_INPUTMOTION = 0x500, /**< Input moved */
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82 SDL_INPUTBUTTONDOWN, /**< Input button pressed */
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83 SDL_INPUTBUTTONUP, /**< Input button released */
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84 SDL_INPUTWHEEL, /**< Input wheel motion */
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85 SDL_INPUTPROXIMITYIN, /**< Input pen entered proximity */
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86 SDL_INPUTPROXIMITYOUT, /**< Input pen left proximity */
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87
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88 /* Joystick events */
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89 SDL_JOYAXISMOTION = 0x600, /**< Joystick axis motion */
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90 SDL_JOYBALLMOTION, /**< Joystick trackball motion */
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91 SDL_JOYHATMOTION, /**< Joystick hat position change */
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92 SDL_JOYBUTTONDOWN, /**< Joystick button pressed */
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93 SDL_JOYBUTTONUP, /**< Joystick button released */
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94
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95 /* Touch events */
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96 SDL_FINGERDOWN = 0x700,
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97 SDL_FINGERUP,
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98 SDL_FINGERMOTION,
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99 SDL_TOUCHBUTTONDOWN,
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100 SDL_TOUCHBUTTONUP,
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101
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102 /* Gesture events */
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103 SDL_DOLLARGESTURE = 0x800,
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104 SDL_DOLLARRECORD,
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105 SDL_MULTIGESTURE,
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106
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107 /* Clipboard events */
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108
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109 SDL_CLIPBOARDUPDATE = 0x900, /**< The clipboard changed */
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110
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111 /* Obsolete events */
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112 SDL_EVENT_COMPAT1 = 0x7000, /**< SDL 1.2 events for compatibility */
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113 SDL_EVENT_COMPAT2,
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114 SDL_EVENT_COMPAT3,
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115
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116
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117 /** Events ::SDL_USEREVENT through ::SDL_LASTEVENT are for your use,
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118 * and should be allocated with SDL_RegisterEvents()
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119 */
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120 SDL_USEREVENT = 0x8000,
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121
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122 /**
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123 * This last event is only for bounding internal arrays
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124 */
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125 SDL_LASTEVENT = 0xFFFF
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126 } SDL_EventType;
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127
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128 /**
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129 * \brief Window state change event data (event.window.*)
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130 */
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131 typedef struct SDL_WindowEvent
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132 {
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133 Uint32 type; /**< ::SDL_WINDOWEVENT */
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134 Uint32 windowID; /**< The associated window */
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135 Uint8 event; /**< ::SDL_WindowEventID */
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136 Uint8 padding1;
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137 Uint8 padding2;
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138 Uint8 padding3;
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139 int data1; /**< event dependent data */
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140 int data2; /**< event dependent data */
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141 } SDL_WindowEvent;
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142
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143 /**
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144 * \brief Keyboard button event structure (event.key.*)
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145 */
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146 typedef struct SDL_KeyboardEvent
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147 {
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148 Uint32 type; /**< ::SDL_KEYDOWN or ::SDL_KEYUP */
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149 Uint32 windowID; /**< The window with keyboard focus, if any */
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150 Uint8 state; /**< ::SDL_PRESSED or ::SDL_RELEASED */
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151 Uint8 padding1;
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152 Uint8 padding2;
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153 Uint8 padding3;
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154 SDL_keysym keysym; /**< The key that was pressed or released */
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155 } SDL_KeyboardEvent;
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156
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157 #define SDL_TEXTEDITINGEVENT_TEXT_SIZE (32)
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158 /**
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159 * \brief Keyboard text editing event structure (event.edit.*)
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160 */
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161 typedef struct SDL_TextEditingEvent
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162 {
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163 Uint32 type; /**< ::SDL_TEXTEDITING */
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164 Uint32 windowID; /**< The window with keyboard focus, if any */
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165 char text[SDL_TEXTEDITINGEVENT_TEXT_SIZE]; /**< The editing text */
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166 int start; /**< The start cursor of selected editing text */
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167 int length; /**< The length of selected editing text */
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168 } SDL_TextEditingEvent;
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169
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170
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171 #define SDL_TEXTINPUTEVENT_TEXT_SIZE (32)
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172 /**
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173 * \brief Keyboard text input event structure (event.text.*)
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174 */
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175 typedef struct SDL_TextInputEvent
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176 {
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177 Uint32 type; /**< ::SDL_TEXTINPUT */
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178 Uint32 windowID; /**< The window with keyboard focus, if any */
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179 char text[SDL_TEXTINPUTEVENT_TEXT_SIZE]; /**< The input text */
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180 } SDL_TextInputEvent;
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181
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182 /**
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183 * \brief Mouse motion event structure (event.motion.*)
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184 */
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185 typedef struct SDL_MouseMotionEvent
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186 {
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187 Uint32 type; /**< ::SDL_MOUSEMOTION */
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188 Uint32 windowID; /**< The window with mouse focus, if any */
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189 Uint8 state; /**< The current button state */
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190 Uint8 padding1;
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191 Uint8 padding2;
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192 Uint8 padding3;
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193 int x; /**< X coordinate, relative to window */
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194 int y; /**< Y coordinate, relative to window */
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195 int xrel; /**< The relative motion in the X direction */
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196 int yrel; /**< The relative motion in the Y direction */
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197 } SDL_MouseMotionEvent;
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198
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199 /**
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200 * \brief Mouse button event structure (event.button.*)
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201 */
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202 typedef struct SDL_MouseButtonEvent
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203 {
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204 Uint32 type; /**< ::SDL_MOUSEBUTTONDOWN or ::SDL_MOUSEBUTTONUP */
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205 Uint32 windowID; /**< The window with mouse focus, if any */
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206 Uint8 button; /**< The mouse button index */
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207 Uint8 state; /**< ::SDL_PRESSED or ::SDL_RELEASED */
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208 Uint8 padding1;
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209 Uint8 padding2;
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210 int x; /**< X coordinate, relative to window */
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211 int y; /**< Y coordinate, relative to window */
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212 } SDL_MouseButtonEvent;
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213
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214 /**
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215 * \brief Mouse wheel event structure (event.wheel.*)
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216 */
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217 typedef struct SDL_MouseWheelEvent
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218 {
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219 Uint32 type; /**< ::SDL_MOUSEWHEEL */
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220 Uint32 windowID; /**< The window with mouse focus, if any */
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221 int x; /**< The amount scrolled horizontally */
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222 int y; /**< The amount scrolled vertically */
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223 } SDL_MouseWheelEvent;
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224
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225 /**
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226 * \brief Joystick axis motion event structure (event.jaxis.*)
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227 */
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228 typedef struct SDL_JoyAxisEvent
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229 {
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230 Uint32 type; /**< ::SDL_JOYAXISMOTION */
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231 Uint8 which; /**< The joystick device index */
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232 Uint8 axis; /**< The joystick axis index */
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233 Uint8 padding1;
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234 Uint8 padding2;
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235 int value; /**< The axis value (range: -32768 to 32767) */
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236 } SDL_JoyAxisEvent;
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237
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238 /**
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239 * \brief Joystick trackball motion event structure (event.jball.*)
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240 */
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241 typedef struct SDL_JoyBallEvent
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242 {
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243 Uint32 type; /**< ::SDL_JOYBALLMOTION */
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244 Uint8 which; /**< The joystick device index */
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245 Uint8 ball; /**< The joystick trackball index */
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246 Uint8 padding1;
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247 Uint8 padding2;
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248 int xrel; /**< The relative motion in the X direction */
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249 int yrel; /**< The relative motion in the Y direction */
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250 } SDL_JoyBallEvent;
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251
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252 /**
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253 * \brief Joystick hat position change event structure (event.jhat.*)
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254 */
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255 typedef struct SDL_JoyHatEvent
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256 {
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257 Uint32 type; /**< ::SDL_JOYHATMOTION */
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258 Uint8 which; /**< The joystick device index */
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259 Uint8 hat; /**< The joystick hat index */
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260 Uint8 value; /**< The hat position value.
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261 * \sa ::SDL_HAT_LEFTUP ::SDL_HAT_UP ::SDL_HAT_RIGHTUP
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262 * \sa ::SDL_HAT_LEFT ::SDL_HAT_CENTERED ::SDL_HAT_RIGHT
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263 * \sa ::SDL_HAT_LEFTDOWN ::SDL_HAT_DOWN ::SDL_HAT_RIGHTDOWN
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264 *
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265 * Note that zero means the POV is centered.
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266 */
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267 Uint8 padding1;
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268 } SDL_JoyHatEvent;
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269
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270 /**
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271 * \brief Joystick button event structure (event.jbutton.*)
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272 */
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273 typedef struct SDL_JoyButtonEvent
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274 {
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275 Uint32 type; /**< ::SDL_JOYBUTTONDOWN or ::SDL_JOYBUTTONUP */
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276 Uint8 which; /**< The joystick device index */
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277 Uint8 button; /**< The joystick button index */
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278 Uint8 state; /**< ::SDL_PRESSED or ::SDL_RELEASED */
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279 Uint8 padding1;
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280 } SDL_JoyButtonEvent;
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281
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282
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283 /**
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284 * \brief Touch finger motion/finger event structure (event.tmotion.*)
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285 */
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286 typedef struct SDL_TouchFingerEvent
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287 {
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288 Uint32 type; /**< ::SDL_FINGERMOTION OR
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289 SDL_FINGERDOWN OR SDL_FINGERUP*/
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290 Uint32 windowID; /**< The window with mouse focus, if any */
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291 SDL_TouchID touchId; /**< The touch device id */
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292 SDL_FingerID fingerId;
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293 Uint8 state; /**< The current button state */
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294 Uint8 padding1;
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295 Uint8 padding2;
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296 Uint8 padding3;
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297 Uint16 x;
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298 Uint16 y;
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299 Uint16 pressure;
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300 } SDL_TouchFingerEvent;
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301
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302
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303 /**
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304 * \brief Touch finger motion/finger event structure (event.tmotion.*)
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305 */
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306 typedef struct SDL_TouchButtonEvent
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307 {
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308 Uint32 type; /**< ::SDL_TOUCHBUTTONUP OR SDL_TOUCHBUTTONDOWN */
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309 Uint32 windowID; /**< The window with mouse focus, if any */
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310 SDL_TouchID touchId; /**< The touch device index */
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311 Uint8 state; /**< The current button state */
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312 Uint8 button; /**< The button changing state */
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313 Uint8 padding1;
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314 Uint8 padding2;
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315 } SDL_TouchButtonEvent;
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316
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317
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318
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319 /**
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320 * \brief Multiple Finger Gesture Event
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321 */
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322 typedef struct SDL_MultiGestureEvent
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323 {
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324 Uint32 type; /**< ::SDL_MULTIGESTURE */
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325 Uint32 windowID; /**< The window with mouse focus, if any */
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326 SDL_TouchID touchId; /**< The touch device index */
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327 float dTheta;
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328 float dDist;
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329 float x; //currently 0...1. Change to screen coords?
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330 float y;
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331
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332 } SDL_MultiGestureEvent;
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333
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334 typedef struct SDL_DollarGestureEvent
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335 {
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336 Uint32 type; /**< ::SDL_DOLLARGESTURE */
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337 Uint32 windowID; /**< The window with mouse focus, if any */
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338 SDL_TouchID touchId; /**< The touch device index */
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339 SDL_GestureID gestureId;
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340 float error;
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341 /*
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342 //TODO: Enable to give location?
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343 float x; //currently 0...1. Change to screen coords?
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344 float y;
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345 */
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346 } SDL_DollarGestureEvent;
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347
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348
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349
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350
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351 /**
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352 * \brief The "quit requested" event
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353 */
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354 typedef struct SDL_QuitEvent
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355 {
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356 Uint32 type; /**< ::SDL_QUIT */
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357 } SDL_QuitEvent;
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358
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359 /**
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360 * \brief A user-defined event type (event.user.*)
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361 */
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362 typedef struct SDL_UserEvent
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363 {
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364 Uint32 type; /**< ::SDL_USEREVENT through ::SDL_NUMEVENTS-1 */
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365 Uint32 windowID; /**< The associated window if any */
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366 int code; /**< User defined event code */
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367 void *data1; /**< User defined data pointer */
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368 void *data2; /**< User defined data pointer */
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369 } SDL_UserEvent;
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370
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371 struct SDL_SysWMmsg;
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372 typedef struct SDL_SysWMmsg SDL_SysWMmsg;
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373
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374 /**
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375 * \brief A video driver dependent system event (event.syswm.*)
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376 *
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377 * \note If you want to use this event, you should include SDL_syswm.h.
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378 */
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379 typedef struct SDL_SysWMEvent
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380 {
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381 Uint32 type; /**< ::SDL_SYSWMEVENT */
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382 SDL_SysWMmsg *msg; /**< driver dependent data, defined in SDL_syswm.h */
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383 } SDL_SysWMEvent;
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384
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385 #ifndef SDL_NO_COMPAT
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386 /**
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387 * \addtogroup Compatibility
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388 */
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389 /*@{*/
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390
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391 /**
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392 * \name Typedefs for backwards compatibility
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393 */
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394 /*@{*/
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395 typedef struct SDL_ActiveEvent
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396 {
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397 Uint32 type;
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398 Uint8 gain;
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399 Uint8 state;
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400 } SDL_ActiveEvent;
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401
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402 typedef struct SDL_ResizeEvent
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403 {
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404 Uint32 type;
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405 int w;
0c85abc61e47 Added a #ifndef SDL_NO_COMPAT around SDL_ActiveEvent and SDL_ResizeEvent so that code
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diff changeset
406 int h;
0c85abc61e47 Added a #ifndef SDL_NO_COMPAT around SDL_ActiveEvent and SDL_ResizeEvent so that code
Bob Pendleton <bob@pendleton.com>
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diff changeset
407 } SDL_ResizeEvent;
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408 /*@}*/
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diff changeset
409
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diff changeset
410 /*@}*//*Compatibility*/
3167
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diff changeset
411 #endif
0c85abc61e47 Added a #ifndef SDL_NO_COMPAT around SDL_ActiveEvent and SDL_ResizeEvent so that code
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parents: 3072
diff changeset
412
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diff changeset
413 /**
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414 * \brief General event structure
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415 */
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416 typedef union SDL_Event
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417 {
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418 Uint32 type; /**< Event type, shared with all events */
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419 SDL_WindowEvent window; /**< Window event data */
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420 SDL_KeyboardEvent key; /**< Keyboard event data */
3280
00cace2d9080 Merged a cleaned up version of Jiang's code changes from Google Summer of Code 2009
Sam Lantinga <slouken@libsdl.org>
parents: 3191
diff changeset
421 SDL_TextEditingEvent edit; /**< Text editing event data */
2300
c97ad1abe05b Minimal implementation of textinput events for x11. It only works for latin-1.
Bob Pendleton <bob@pendleton.com>
parents: 2152
diff changeset
422 SDL_TextInputEvent text; /**< Text input event data */
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423 SDL_MouseMotionEvent motion; /**< Mouse motion event data */
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424 SDL_MouseButtonEvent button; /**< Mouse button event data */
2300
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Bob Pendleton <bob@pendleton.com>
parents: 2152
diff changeset
425 SDL_MouseWheelEvent wheel; /**< Mouse wheel event data */
1895
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426 SDL_JoyAxisEvent jaxis; /**< Joystick axis event data */
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427 SDL_JoyBallEvent jball; /**< Joystick ball event data */
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428 SDL_JoyHatEvent jhat; /**< Joystick hat event data */
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429 SDL_JoyButtonEvent jbutton; /**< Joystick button event data */
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430 SDL_QuitEvent quit; /**< Quit request event data */
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431 SDL_UserEvent user; /**< Custom event data */
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432 SDL_SysWMEvent syswm; /**< System dependent window event data */
4641
49a97daea6ec Added touch event definitions. Heavily modified events/SDL_touch*.
Jim Grandpre <jim.tla@gmail.com>
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diff changeset
433 SDL_TouchFingerEvent tfinger; /**< Touch finger event data */
49a97daea6ec Added touch event definitions. Heavily modified events/SDL_touch*.
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diff changeset
434 SDL_TouchButtonEvent tbutton; /**< Touch button event data */
4657
eed063a0bf5b Moved Multi finger gesture recognition into the library.
Jim Grandpre <jim.tla@gmail.com>
parents: 4644
diff changeset
435 SDL_MultiGestureEvent mgesture; /**< Multi Finger Gesture data*/
4658
454385d76845 Moved $1 Gestures into the SDL Library
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parents: 4657
diff changeset
436 SDL_DollarGestureEvent dgesture; /**< Multi Finger Gesture data*/
1895
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437
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438 /** Temporarily here for backwards compatibility */
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diff changeset
439 /*@{*/
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Bob Pendleton <bob@pendleton.com>
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440 #ifndef SDL_NO_COMPAT
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441 SDL_ActiveEvent active;
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442 SDL_ResizeEvent resize;
3167
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443 #endif
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444 /*@}*/
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445 } SDL_Event;
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446
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parents:
diff changeset
447
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diff changeset
448 /* Function prototypes */
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449
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450 /**
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diff changeset
451 * Pumps the event loop, gathering events from the input devices.
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diff changeset
452 *
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diff changeset
453 * This function updates the event queue and internal input device state.
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454 *
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diff changeset
455 * This should only be run in the thread that sets the video mode.
d3baf5ac4e37 Partial fix for bug #859
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diff changeset
456 */
337
9154ec9ca3d2 Explicitly specify the SDL API calling convention (C by default)
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diff changeset
457 extern DECLSPEC void SDLCALL SDL_PumpEvents(void);
0
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458
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diff changeset
459 /*@{*/
1895
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diff changeset
460 typedef enum
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diff changeset
461 {
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diff changeset
462 SDL_ADDEVENT,
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diff changeset
463 SDL_PEEKEVENT,
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diff changeset
464 SDL_GETEVENT
0
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465 } SDL_eventaction;
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diff changeset
466
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467 /**
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diff changeset
468 * Checks the event queue for messages and optionally returns them.
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469 *
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470 * If \c action is ::SDL_ADDEVENT, up to \c numevents events will be added to
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471 * the back of the event queue.
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472 *
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diff changeset
473 * If \c action is ::SDL_PEEKEVENT, up to \c numevents events at the front
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474 * of the event queue, matching \c mask, will be returned and will not
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475 * be removed from the queue.
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476 *
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parents: 3280
diff changeset
477 * If \c action is ::SDL_GETEVENT, up to \c numevents events at the front
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478 * of the event queue, matching \c mask, will be returned and will be
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479 * removed from the queue.
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480 *
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481 * \return The number of events actually stored, or -1 if there was an error.
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482 *
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483 * This function is thread-safe.
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484 */
1895
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diff changeset
485 extern DECLSPEC int SDLCALL SDL_PeepEvents(SDL_Event * events, int numevents,
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486 SDL_eventaction action,
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487 Uint32 minType, Uint32 maxType);
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488 /*@}*/
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489
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490 /**
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diff changeset
491 * Checks to see if certain event types are in the event queue.
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492 */
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diff changeset
493 extern DECLSPEC SDL_bool SDLCALL SDL_HasEvent(Uint32 type);
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diff changeset
494 extern DECLSPEC SDL_bool SDLCALL SDL_HasEvents(Uint32 minType, Uint32 maxType);
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diff changeset
495
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diff changeset
496 /**
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diff changeset
497 * This function clears events from the event queue
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diff changeset
498 */
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diff changeset
499 extern DECLSPEC void SDLCALL SDL_FlushEvent(Uint32 type);
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diff changeset
500 extern DECLSPEC void SDLCALL SDL_FlushEvents(Uint32 minType, Uint32 maxType);
0
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diff changeset
501
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diff changeset
502 /**
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diff changeset
503 * \brief Polls for currently pending events.
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diff changeset
504 *
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diff changeset
505 * \return 1 if there are any pending events, or 0 if there are none available.
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diff changeset
506 *
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diff changeset
507 * \param event If not NULL, the next event is removed from the queue and
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diff changeset
508 * stored in that area.
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509 */
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diff changeset
510 extern DECLSPEC int SDLCALL SDL_PollEvent(SDL_Event * event);
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parents:
diff changeset
511
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diff changeset
512 /**
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diff changeset
513 * \brief Waits indefinitely for the next available event.
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diff changeset
514 *
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diff changeset
515 * \return 1, or 0 if there was an error while waiting for events.
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diff changeset
516 *
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diff changeset
517 * \param event If not NULL, the next event is removed from the queue and
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diff changeset
518 * stored in that area.
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parents:
diff changeset
519 */
1895
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diff changeset
520 extern DECLSPEC int SDLCALL SDL_WaitEvent(SDL_Event * event);
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diff changeset
521
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diff changeset
522 /**
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diff changeset
523 * \brief Waits until the specified timeout (in milliseconds) for the next
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diff changeset
524 * available event.
d3baf5ac4e37 Partial fix for bug #859
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diff changeset
525 *
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diff changeset
526 * \return 1, or 0 if there was an error while waiting for events.
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diff changeset
527 *
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diff changeset
528 * \param event If not NULL, the next event is removed from the queue and
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diff changeset
529 * stored in that area.
3072
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Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
530 */
9da8f57ab92c Fixed bug #684
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
531 extern DECLSPEC int SDLCALL SDL_WaitEventTimeout(SDL_Event * event,
9da8f57ab92c Fixed bug #684
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
532 int timeout);
9da8f57ab92c Fixed bug #684
Sam Lantinga <slouken@libsdl.org>
parents: 2859
diff changeset
533
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diff changeset
534 /**
d3baf5ac4e37 Partial fix for bug #859
Sam Lantinga <slouken@libsdl.org>
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diff changeset
535 * \brief Add an event to the event queue.
d3baf5ac4e37 Partial fix for bug #859
Sam Lantinga <slouken@libsdl.org>
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diff changeset
536 *
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Sam Lantinga <slouken@libsdl.org>
parents: 3280
diff changeset
537 * \return 1 on success, 0 if the event was filtered, or -1 if the event queue
d3baf5ac4e37 Partial fix for bug #859
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diff changeset
538 * was full or there was some other error.
0
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diff changeset
539 */
1895
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
540 extern DECLSPEC int SDLCALL SDL_PushEvent(SDL_Event * event);
0
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
541
3407
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diff changeset
542 typedef int (SDLCALL * SDL_EventFilter) (void *userdata, SDL_Event * event);
0
74212992fb08 Initial revision
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parents:
diff changeset
543
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544 /**
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545 * Sets up a filter to process all events before they change internal state and
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546 * are posted to the internal event queue.
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547 *
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548 * The filter is protypted as:
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549 * \code
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550 * int SDL_EventFilter(void *userdata, SDL_Event * event);
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551 * \endcode
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552 *
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553 * If the filter returns 1, then the event will be added to the internal queue.
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554 * If it returns 0, then the event will be dropped from the queue, but the
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555 * internal state will still be updated. This allows selective filtering of
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556 * dynamically arriving events.
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557 *
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558 * \warning Be very careful of what you do in the event filter function, as
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559 * it may run in a different thread!
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560 *
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561 * There is one caveat when dealing with the ::SDL_QUITEVENT event type. The
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562 * event filter is only called when the window manager desires to close the
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563 * application window. If the event filter returns 1, then the window will
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564 * be closed, otherwise the window will remain open if possible.
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565 *
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566 * If the quit event is generated by an interrupt signal, it will bypass the
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567 * internal queue and be delivered to the application at the next event poll.
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568 */
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569 extern DECLSPEC void SDLCALL SDL_SetEventFilter(SDL_EventFilter filter,
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570 void *userdata);
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571
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572 /**
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573 * Return the current event filter - can be used to "chain" filters.
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574 * If there is no event filter set, this function returns SDL_FALSE.
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575 */
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576 extern DECLSPEC SDL_bool SDLCALL SDL_GetEventFilter(SDL_EventFilter * filter,
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577 void **userdata);
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578
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579 /**
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580 * Run the filter function on the current event queue, removing any
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581 * events for which the filter returns 0.
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582 */
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583 extern DECLSPEC void SDLCALL SDL_FilterEvents(SDL_EventFilter filter,
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584 void *userdata);
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585
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586 /*@{*/
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587 #define SDL_QUERY -1
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588 #define SDL_IGNORE 0
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589 #define SDL_DISABLE 0
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590 #define SDL_ENABLE 1
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591
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592 /**
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593 * This function allows you to set the state of processing certain events.
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594 * - If \c state is set to ::SDL_IGNORE, that event will be automatically
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595 * dropped from the event queue and will not event be filtered.
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596 * - If \c state is set to ::SDL_ENABLE, that event will be processed
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597 * normally.
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598 * - If \c state is set to ::SDL_QUERY, SDL_EventState() will return the
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599 * current processing state of the specified event.
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600 */
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601 extern DECLSPEC Uint8 SDLCALL SDL_EventState(Uint32 type, int state);
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602 /*@}*/
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603 #define SDL_GetEventState(type) SDL_EventState(type, SDL_QUERY)
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604
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605 /**
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606 * This function allocates a set of user-defined events, and returns
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607 * the beginning event number for that set of events.
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608 *
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609 * If there aren't enough user-defined events left, this function
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610 * returns (Uint32)-1
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611 */
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612 extern DECLSPEC Uint32 SDLCALL SDL_RegisterEvents(int numevents);
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613
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614 /* Ends C function definitions when using C++ */
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615 #ifdef __cplusplus
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616 /* *INDENT-OFF* */
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617 }
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618 /* *INDENT-ON* */
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619 #endif
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620 #include "close_code.h"
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621
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622 #endif /* _SDL_events_h */
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623
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624 /* vi: set ts=4 sw=4 expandtab: */