annotate src/events/SDL_mouse.c @ 943:715c32d8f26c

Date: Sun, 18 Jul 2004 00:22:07 -0400 From: "Philippe Anctil" Subject: [SDL] odd mouse event generated on init The mouse relative and absolute coordinates appear to be always equal for the first mouse event.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Aug 2004 12:38:50 +0000
parents b8d311d90021
children 28ac87a38c17
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
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62 /* We lost the mouse, so post button up messages for all pressed buttons */
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63 void SDL_ResetMouse(void)
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64 {
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65 Uint8 i;
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66 for ( i = 0; i < sizeof(SDL_ButtonState)*8; ++i ) {
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67 if ( SDL_ButtonState & SDL_BUTTON(i) ) {
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68 SDL_PrivateMouseButton(SDL_RELEASED, i, 0, 0);
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69 }
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70 }
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71 }
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72
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73 Uint8 SDL_GetMouseState (int *x, int *y)
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74 {
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75 if ( x ) {
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76 if ( SDL_MouseX < 0 ) {
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77 *x = 0;
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78 } else {
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79 *x = SDL_MouseX;
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80 }
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81 }
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82 if ( y ) {
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83 if ( SDL_MouseY < 0 ) {
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84 *y = 0;
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85 } else {
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86 *y = SDL_MouseY;
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87 }
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88 }
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89 return(SDL_ButtonState);
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90 }
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91
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92 Uint8 SDL_GetRelativeMouseState (int *x, int *y)
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93 {
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94 if ( x )
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95 *x = SDL_DeltaX;
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96 if ( y )
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97 *y = SDL_DeltaY;
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98 SDL_DeltaX = 0;
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99 SDL_DeltaY = 0;
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100 return(SDL_ButtonState);
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101 }
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102
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103 static void ClipOffset(Sint16 *x, Sint16 *y)
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104 {
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105 /* This clips absolute mouse coordinates when the apparent
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106 display surface is smaller than the real display surface.
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107 */
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108 if ( SDL_VideoSurface->offset ) {
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109 *y -= SDL_VideoSurface->offset/SDL_VideoSurface->pitch;
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110 *x -= (SDL_VideoSurface->offset%SDL_VideoSurface->pitch)/
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111 SDL_VideoSurface->format->BytesPerPixel;
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112 }
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113 }
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114
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115 /* These are global for SDL_eventloop.c */
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116 int SDL_PrivateMouseMotion(Uint8 buttonstate, int relative, Sint16 x, Sint16 y)
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117 {
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118 int posted;
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119 Uint16 X, Y;
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120 Sint16 Xrel;
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121 Sint16 Yrel;
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122
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123 /* Don't handle mouse motion if there's no cursor surface */
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124 if ( SDL_VideoSurface == NULL ) {
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125 return(0);
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126 }
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127
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128 /* Default buttonstate is the current one */
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129 if ( ! buttonstate ) {
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130 buttonstate = SDL_ButtonState;
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131 }
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132
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133 Xrel = x;
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134 Yrel = y;
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135 if ( relative ) {
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136 /* Push the cursor around */
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137 x = (SDL_MouseX+x);
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138 y = (SDL_MouseY+y);
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139 } else {
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140 /* Do we need to clip {x,y} ? */
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141 ClipOffset(&x, &y);
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142 }
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143
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144 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */
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145 if ( x < 0 )
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146 X = 0;
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147 else
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148 if ( x >= SDL_VideoSurface->w )
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149 X = SDL_VideoSurface->w-1;
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150 else
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151 X = (Uint16)x;
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152
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153 if ( y < 0 )
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154 Y = 0;
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155 else
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156 if ( y >= SDL_VideoSurface->h )
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157 Y = SDL_VideoSurface->h-1;
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158 else
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159 Y = (Uint16)y;
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160
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161 /* If not relative mode, generate relative motion from clamped X/Y.
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162 This prevents lots of extraneous large delta relative motion when
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163 the screen is windowed mode and the mouse is outside the window.
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164 */
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715c32d8f26c Date: Sun, 18 Jul 2004 00:22:07 -0400
Sam Lantinga <slouken@libsdl.org>
parents: 769
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165 if ( ! relative && SDL_MouseX >= 0 && SDL_MouseY >= 0 ) {
0
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166 Xrel = X-SDL_MouseX;
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167 Yrel = Y-SDL_MouseY;
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168 }
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169
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170 /* Update internal mouse state */
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171 SDL_ButtonState = buttonstate;
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172 SDL_MouseX = X;
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173 SDL_MouseY = Y;
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174 SDL_DeltaX += Xrel;
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175 SDL_DeltaY += Yrel;
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176 SDL_MoveCursor(SDL_MouseX, SDL_MouseY);
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177
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178 /* Post the event, if desired */
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179 posted = 0;
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180 if ( SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE ) {
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181 SDL_Event event;
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182 memset(&event, 0, sizeof(event));
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183 event.type = SDL_MOUSEMOTION;
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184 event.motion.state = buttonstate;
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185 event.motion.x = X;
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186 event.motion.y = Y;
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187 event.motion.xrel = Xrel;
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188 event.motion.yrel = Yrel;
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189 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
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190 posted = 1;
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191 SDL_PushEvent(&event);
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192 }
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193 }
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194 return(posted);
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195 }
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196
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197 int SDL_PrivateMouseButton(Uint8 state, Uint8 button, Sint16 x, Sint16 y)
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198 {
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199 SDL_Event event;
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200 int posted;
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201 int move_mouse;
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202 Uint8 buttonstate;
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203
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204 memset(&event, 0, sizeof(event));
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205
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206 /* Check parameters */
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207 if ( x || y ) {
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208 ClipOffset(&x, &y);
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209 move_mouse = 1;
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210 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */
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211 if ( x < 0 )
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212 x = 0;
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213 else
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214 if ( x >= SDL_VideoSurface->w )
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215 x = SDL_VideoSurface->w-1;
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216
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217 if ( y < 0 )
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218 y = 0;
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219 else
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220 if ( y >= SDL_VideoSurface->h )
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221 y = SDL_VideoSurface->h-1;
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222 } else {
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223 move_mouse = 0;
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224 }
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225 if ( ! x )
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226 x = SDL_MouseX;
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227 if ( ! y )
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228 y = SDL_MouseY;
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229
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230 /* Figure out which event to perform */
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231 buttonstate = SDL_ButtonState;
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232 switch ( state ) {
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233 case SDL_PRESSED:
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234 event.type = SDL_MOUSEBUTTONDOWN;
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235 buttonstate |= SDL_BUTTON(button);
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236 break;
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237 case SDL_RELEASED:
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238 event.type = SDL_MOUSEBUTTONUP;
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239 buttonstate &= ~SDL_BUTTON(button);
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240 break;
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241 default:
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242 /* Invalid state -- bail */
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243 return(0);
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244 }
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245
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246 /* Update internal mouse state */
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247 SDL_ButtonState = buttonstate;
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248 if ( move_mouse ) {
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249 SDL_MouseX = x;
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250 SDL_MouseY = y;
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251 SDL_MoveCursor(SDL_MouseX, SDL_MouseY);
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252 }
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253
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254 /* Post the event, if desired */
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255 posted = 0;
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256 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) {
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257 event.button.state = state;
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258 event.button.button = button;
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259 event.button.x = x;
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260 event.button.y = y;
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261 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) {
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262 posted = 1;
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263 SDL_PushEvent(&event);
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264 }
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265 }
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266 return(posted);
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267 }
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268