Mercurial > sdl-ios-xcode
annotate src/events/SDL_mouse.c @ 1379:c0a74f199ecf
Use only safe string functions
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 19 Feb 2006 23:46:34 +0000 |
| parents | 19418e4422cb |
| children | d910939febfa |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 /* General mouse handling code for SDL */ | |
| 24 | |
| 25 #include "SDL_events.h" | |
| 26 #include "SDL_events_c.h" | |
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27 #include "../video/SDL_cursor_c.h" |
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28 #include "../video/SDL_sysvideo.h" |
| 0 | 29 |
| 30 | |
| 31 /* These are static for our mouse handling code */ | |
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32 static Sint16 SDL_MouseX = -1; |
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33 static Sint16 SDL_MouseY = -1; |
| 0 | 34 static Sint16 SDL_DeltaX = 0; |
| 35 static Sint16 SDL_DeltaY = 0; | |
| 36 static Uint8 SDL_ButtonState = 0; | |
| 37 | |
| 38 | |
| 39 /* Public functions */ | |
| 40 int SDL_MouseInit(void) | |
| 41 { | |
| 42 /* The mouse is at (0,0) */ | |
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43 SDL_MouseX = -1; |
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44 SDL_MouseY = -1; |
| 0 | 45 SDL_DeltaX = 0; |
| 46 SDL_DeltaY = 0; | |
| 47 SDL_ButtonState = 0; | |
| 48 | |
| 49 /* That's it! */ | |
| 50 return(0); | |
| 51 } | |
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52 void SDL_MouseQuit(void) |
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53 { |
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54 } |
| 0 | 55 |
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56 /* We lost the mouse, so post button up messages for all pressed buttons */ |
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57 void SDL_ResetMouse(void) |
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58 { |
| 518 | 59 Uint8 i; |
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60 for ( i = 0; i < sizeof(SDL_ButtonState)*8; ++i ) { |
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61 if ( SDL_ButtonState & SDL_BUTTON(i) ) { |
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62 SDL_PrivateMouseButton(SDL_RELEASED, i, 0, 0); |
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63 } |
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64 } |
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65 } |
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66 |
| 0 | 67 Uint8 SDL_GetMouseState (int *x, int *y) |
| 68 { | |
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69 if ( x ) { |
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70 if ( SDL_MouseX < 0 ) { |
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71 *x = 0; |
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72 } else { |
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73 *x = SDL_MouseX; |
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74 } |
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75 } |
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76 if ( y ) { |
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77 if ( SDL_MouseY < 0 ) { |
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78 *y = 0; |
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79 } else { |
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80 *y = SDL_MouseY; |
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81 } |
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82 } |
| 0 | 83 return(SDL_ButtonState); |
| 84 } | |
| 85 | |
| 86 Uint8 SDL_GetRelativeMouseState (int *x, int *y) | |
| 87 { | |
| 88 if ( x ) | |
| 89 *x = SDL_DeltaX; | |
| 90 if ( y ) | |
| 91 *y = SDL_DeltaY; | |
| 92 SDL_DeltaX = 0; | |
| 93 SDL_DeltaY = 0; | |
| 94 return(SDL_ButtonState); | |
| 95 } | |
| 96 | |
| 97 static void ClipOffset(Sint16 *x, Sint16 *y) | |
| 98 { | |
| 99 /* This clips absolute mouse coordinates when the apparent | |
| 100 display surface is smaller than the real display surface. | |
| 101 */ | |
| 102 if ( SDL_VideoSurface->offset ) { | |
| 103 *y -= SDL_VideoSurface->offset/SDL_VideoSurface->pitch; | |
| 104 *x -= (SDL_VideoSurface->offset%SDL_VideoSurface->pitch)/ | |
| 105 SDL_VideoSurface->format->BytesPerPixel; | |
| 106 } | |
| 107 } | |
| 108 | |
| 109 /* These are global for SDL_eventloop.c */ | |
| 110 int SDL_PrivateMouseMotion(Uint8 buttonstate, int relative, Sint16 x, Sint16 y) | |
| 111 { | |
| 112 int posted; | |
| 113 Uint16 X, Y; | |
| 114 Sint16 Xrel; | |
| 115 Sint16 Yrel; | |
| 116 | |
| 117 /* Don't handle mouse motion if there's no cursor surface */ | |
| 118 if ( SDL_VideoSurface == NULL ) { | |
| 119 return(0); | |
| 120 } | |
| 121 | |
| 122 /* Default buttonstate is the current one */ | |
| 123 if ( ! buttonstate ) { | |
| 124 buttonstate = SDL_ButtonState; | |
| 125 } | |
| 126 | |
| 127 Xrel = x; | |
| 128 Yrel = y; | |
| 129 if ( relative ) { | |
| 130 /* Push the cursor around */ | |
| 131 x = (SDL_MouseX+x); | |
| 132 y = (SDL_MouseY+y); | |
| 133 } else { | |
| 134 /* Do we need to clip {x,y} ? */ | |
| 135 ClipOffset(&x, &y); | |
| 136 } | |
| 137 | |
| 138 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ | |
| 139 if ( x < 0 ) | |
| 140 X = 0; | |
| 141 else | |
| 142 if ( x >= SDL_VideoSurface->w ) | |
| 143 X = SDL_VideoSurface->w-1; | |
| 144 else | |
| 145 X = (Uint16)x; | |
| 146 | |
| 147 if ( y < 0 ) | |
| 148 Y = 0; | |
| 149 else | |
| 150 if ( y >= SDL_VideoSurface->h ) | |
| 151 Y = SDL_VideoSurface->h-1; | |
| 152 else | |
| 153 Y = (Uint16)y; | |
| 154 | |
| 155 /* If not relative mode, generate relative motion from clamped X/Y. | |
| 156 This prevents lots of extraneous large delta relative motion when | |
| 157 the screen is windowed mode and the mouse is outside the window. | |
| 158 */ | |
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159 if ( ! relative && SDL_MouseX >= 0 && SDL_MouseY >= 0 ) { |
| 0 | 160 Xrel = X-SDL_MouseX; |
| 161 Yrel = Y-SDL_MouseY; | |
| 162 } | |
| 163 | |
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164 /* Drop events that don't change state */ |
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165 if ( ! Xrel && ! Yrel ) { |
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166 #if 0 |
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167 printf("Mouse event didn't change state - dropped!\n"); |
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168 #endif |
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169 return(0); |
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170 } |
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171 |
| 0 | 172 /* Update internal mouse state */ |
| 173 SDL_ButtonState = buttonstate; | |
| 174 SDL_MouseX = X; | |
| 175 SDL_MouseY = Y; | |
| 176 SDL_DeltaX += Xrel; | |
| 177 SDL_DeltaY += Yrel; | |
| 178 SDL_MoveCursor(SDL_MouseX, SDL_MouseY); | |
| 179 | |
| 180 /* Post the event, if desired */ | |
| 181 posted = 0; | |
| 182 if ( SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE ) { | |
| 183 SDL_Event event; | |
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184 SDL_memset(&event, 0, sizeof(event)); |
| 0 | 185 event.type = SDL_MOUSEMOTION; |
| 186 event.motion.state = buttonstate; | |
| 187 event.motion.x = X; | |
| 188 event.motion.y = Y; | |
| 189 event.motion.xrel = Xrel; | |
| 190 event.motion.yrel = Yrel; | |
| 191 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 192 posted = 1; | |
| 193 SDL_PushEvent(&event); | |
| 194 } | |
| 195 } | |
| 196 return(posted); | |
| 197 } | |
| 198 | |
| 199 int SDL_PrivateMouseButton(Uint8 state, Uint8 button, Sint16 x, Sint16 y) | |
| 200 { | |
| 201 SDL_Event event; | |
| 202 int posted; | |
| 203 int move_mouse; | |
| 204 Uint8 buttonstate; | |
| 205 | |
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206 SDL_memset(&event, 0, sizeof(event)); |
| 0 | 207 |
| 208 /* Check parameters */ | |
| 209 if ( x || y ) { | |
| 210 ClipOffset(&x, &y); | |
| 211 move_mouse = 1; | |
| 212 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ | |
| 213 if ( x < 0 ) | |
| 214 x = 0; | |
| 215 else | |
| 216 if ( x >= SDL_VideoSurface->w ) | |
| 217 x = SDL_VideoSurface->w-1; | |
| 218 | |
| 219 if ( y < 0 ) | |
| 220 y = 0; | |
| 221 else | |
| 222 if ( y >= SDL_VideoSurface->h ) | |
| 223 y = SDL_VideoSurface->h-1; | |
| 224 } else { | |
| 225 move_mouse = 0; | |
| 226 } | |
| 227 if ( ! x ) | |
| 228 x = SDL_MouseX; | |
| 229 if ( ! y ) | |
| 230 y = SDL_MouseY; | |
| 231 | |
| 232 /* Figure out which event to perform */ | |
| 233 buttonstate = SDL_ButtonState; | |
| 234 switch ( state ) { | |
| 235 case SDL_PRESSED: | |
| 236 event.type = SDL_MOUSEBUTTONDOWN; | |
| 237 buttonstate |= SDL_BUTTON(button); | |
| 238 break; | |
| 239 case SDL_RELEASED: | |
| 240 event.type = SDL_MOUSEBUTTONUP; | |
| 241 buttonstate &= ~SDL_BUTTON(button); | |
| 242 break; | |
| 243 default: | |
| 244 /* Invalid state -- bail */ | |
| 245 return(0); | |
| 246 } | |
| 247 | |
| 248 /* Update internal mouse state */ | |
| 249 SDL_ButtonState = buttonstate; | |
| 250 if ( move_mouse ) { | |
| 251 SDL_MouseX = x; | |
| 252 SDL_MouseY = y; | |
| 253 SDL_MoveCursor(SDL_MouseX, SDL_MouseY); | |
| 254 } | |
| 255 | |
| 256 /* Post the event, if desired */ | |
| 257 posted = 0; | |
| 258 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { | |
| 259 event.button.state = state; | |
| 260 event.button.button = button; | |
| 261 event.button.x = x; | |
| 262 event.button.y = y; | |
| 263 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 264 posted = 1; | |
| 265 SDL_PushEvent(&event); | |
| 266 } | |
| 267 } | |
| 268 return(posted); | |
| 269 } | |
| 270 |