annotate src/events/SDL_mouse.c @ 1123:28ac87a38c17

Date: Fri, 08 Jul 2005 22:43:48 +0200 (CEST) From: Jiri Svoboda Subject: [SDL] signal handling bug I encountered the following bug: SDL doesn't reset signal handlers for SIGTERM and SIGINT, after calling SDL_Quit these remain hooked to the handler in SDL_quit.c, being translated into SDL_QUIT events. Consequently an application that issues a SDL_Quit and remains running will ignore any SIGTERM or SIGINT., and specifically CTRL-C presses.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 21 Aug 2005 06:18:54 +0000
parents 715c32d8f26c
children f214b6fae45a
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* General mouse handling code for SDL */
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29
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30 #include <stdio.h>
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31 #include <stdlib.h>
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32 #include <string.h>
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33
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34 #include "SDL_events.h"
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35 #include "SDL_events_c.h"
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36 #include "SDL_cursor_c.h"
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37 #include "SDL_sysvideo.h"
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38
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39
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40 /* These are static for our mouse handling code */
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41 static Sint16 SDL_MouseX = -1;
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42 static Sint16 SDL_MouseY = -1;
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43 static Sint16 SDL_DeltaX = 0;
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44 static Sint16 SDL_DeltaY = 0;
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45 static Uint8 SDL_ButtonState = 0;
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46
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47
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48 /* Public functions */
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49 int SDL_MouseInit(void)
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50 {
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51 /* The mouse is at (0,0) */
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52 SDL_MouseX = -1;
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53 SDL_MouseY = -1;
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54 SDL_DeltaX = 0;
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55 SDL_DeltaY = 0;
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56 SDL_ButtonState = 0;
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57
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58 /* That's it! */
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59 return(0);
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60 }
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61 void SDL_MouseQuit(void)
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62 {
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63 }
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64
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65 /* We lost the mouse, so post button up messages for all pressed buttons */
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66 void SDL_ResetMouse(void)
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67 {
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68 Uint8 i;
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69 for ( i = 0; i < sizeof(SDL_ButtonState)*8; ++i ) {
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70 if ( SDL_ButtonState & SDL_BUTTON(i) ) {
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71 SDL_PrivateMouseButton(SDL_RELEASED, i, 0, 0);
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72 }
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73 }
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74 }
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75
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76 Uint8 SDL_GetMouseState (int *x, int *y)
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77 {
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78 if ( x ) {
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79 if ( SDL_MouseX < 0 ) {
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80 *x = 0;
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81 } else {
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82 *x = SDL_MouseX;
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83 }
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84 }
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85 if ( y ) {
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86 if ( SDL_MouseY < 0 ) {
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87 *y = 0;
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88 } else {
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89 *y = SDL_MouseY;
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90 }
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91 }
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92 return(SDL_ButtonState);
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93 }
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94
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95 Uint8 SDL_GetRelativeMouseState (int *x, int *y)
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96 {
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97 if ( x )
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98 *x = SDL_DeltaX;
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99 if ( y )
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100 *y = SDL_DeltaY;
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101 SDL_DeltaX = 0;
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102 SDL_DeltaY = 0;
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103 return(SDL_ButtonState);
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104 }
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105
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106 static void ClipOffset(Sint16 *x, Sint16 *y)
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107 {
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108 /* This clips absolute mouse coordinates when the apparent
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109 display surface is smaller than the real display surface.
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110 */
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111 if ( SDL_VideoSurface->offset ) {
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112 *y -= SDL_VideoSurface->offset/SDL_VideoSurface->pitch;
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113 *x -= (SDL_VideoSurface->offset%SDL_VideoSurface->pitch)/
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114 SDL_VideoSurface->format->BytesPerPixel;
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115 }
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116 }
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117
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118 /* These are global for SDL_eventloop.c */
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119 int SDL_PrivateMouseMotion(Uint8 buttonstate, int relative, Sint16 x, Sint16 y)
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120 {
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121 int posted;
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122 Uint16 X, Y;
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123 Sint16 Xrel;
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124 Sint16 Yrel;
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125
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126 /* Don't handle mouse motion if there's no cursor surface */
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127 if ( SDL_VideoSurface == NULL ) {
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128 return(0);
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129 }
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130
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131 /* Default buttonstate is the current one */
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132 if ( ! buttonstate ) {
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133 buttonstate = SDL_ButtonState;
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134 }
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135
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136 Xrel = x;
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137 Yrel = y;
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138 if ( relative ) {
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139 /* Push the cursor around */
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140 x = (SDL_MouseX+x);
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141 y = (SDL_MouseY+y);
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142 } else {
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143 /* Do we need to clip {x,y} ? */
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144 ClipOffset(&x, &y);
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145 }
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146
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147 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */
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148 if ( x < 0 )
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149 X = 0;
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150 else
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151 if ( x >= SDL_VideoSurface->w )
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152 X = SDL_VideoSurface->w-1;
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153 else
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154 X = (Uint16)x;
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155
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156 if ( y < 0 )
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157 Y = 0;
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158 else
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159 if ( y >= SDL_VideoSurface->h )
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160 Y = SDL_VideoSurface->h-1;
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161 else
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162 Y = (Uint16)y;
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163
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164 /* If not relative mode, generate relative motion from clamped X/Y.
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165 This prevents lots of extraneous large delta relative motion when
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166 the screen is windowed mode and the mouse is outside the window.
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167 */
943
715c32d8f26c Date: Sun, 18 Jul 2004 00:22:07 -0400
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168 if ( ! relative && SDL_MouseX >= 0 && SDL_MouseY >= 0 ) {
0
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169 Xrel = X-SDL_MouseX;
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170 Yrel = Y-SDL_MouseY;
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171 }
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172
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173 /* Update internal mouse state */
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174 SDL_ButtonState = buttonstate;
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175 SDL_MouseX = X;
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176 SDL_MouseY = Y;
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177 SDL_DeltaX += Xrel;
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178 SDL_DeltaY += Yrel;
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179 SDL_MoveCursor(SDL_MouseX, SDL_MouseY);
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180
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181 /* Post the event, if desired */
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182 posted = 0;
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183 if ( SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE ) {
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184 SDL_Event event;
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185 memset(&event, 0, sizeof(event));
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186 event.type = SDL_MOUSEMOTION;
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187 event.motion.state = buttonstate;
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188 event.motion.x = X;
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189 event.motion.y = Y;
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190 event.motion.xrel = Xrel;
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191 event.motion.yrel = Yrel;
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192 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
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193 posted = 1;
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194 SDL_PushEvent(&event);
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195 }
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196 }
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197 return(posted);
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198 }
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199
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200 int SDL_PrivateMouseButton(Uint8 state, Uint8 button, Sint16 x, Sint16 y)
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201 {
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202 SDL_Event event;
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203 int posted;
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204 int move_mouse;
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205 Uint8 buttonstate;
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206
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207 memset(&event, 0, sizeof(event));
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208
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209 /* Check parameters */
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210 if ( x || y ) {
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211 ClipOffset(&x, &y);
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212 move_mouse = 1;
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213 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */
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214 if ( x < 0 )
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215 x = 0;
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216 else
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217 if ( x >= SDL_VideoSurface->w )
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218 x = SDL_VideoSurface->w-1;
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219
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220 if ( y < 0 )
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221 y = 0;
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222 else
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223 if ( y >= SDL_VideoSurface->h )
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224 y = SDL_VideoSurface->h-1;
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225 } else {
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226 move_mouse = 0;
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227 }
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228 if ( ! x )
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229 x = SDL_MouseX;
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230 if ( ! y )
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231 y = SDL_MouseY;
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232
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233 /* Figure out which event to perform */
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234 buttonstate = SDL_ButtonState;
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235 switch ( state ) {
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236 case SDL_PRESSED:
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237 event.type = SDL_MOUSEBUTTONDOWN;
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238 buttonstate |= SDL_BUTTON(button);
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239 break;
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240 case SDL_RELEASED:
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241 event.type = SDL_MOUSEBUTTONUP;
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242 buttonstate &= ~SDL_BUTTON(button);
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243 break;
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244 default:
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245 /* Invalid state -- bail */
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246 return(0);
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247 }
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248
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249 /* Update internal mouse state */
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250 SDL_ButtonState = buttonstate;
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251 if ( move_mouse ) {
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252 SDL_MouseX = x;
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253 SDL_MouseY = y;
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254 SDL_MoveCursor(SDL_MouseX, SDL_MouseY);
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255 }
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256
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257 /* Post the event, if desired */
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258 posted = 0;
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259 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) {
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260 event.button.state = state;
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261 event.button.button = button;
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262 event.button.x = x;
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263 event.button.y = y;
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264 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
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265 posted = 1;
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266 SDL_PushEvent(&event);
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267 }
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268 }
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269 return(posted);
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270 }
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271