Mercurial > sdl-ios-xcode
annotate src/events/SDL_mouse.c @ 1604:bfba1ea4452a
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 23 Mar 2006 21:39:02 +0000 |
| parents | 23a347cfbed8 |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| 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 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* General mouse handling code for SDL */ | |
| 25 | |
| 26 #include "SDL_events.h" | |
| 27 #include "SDL_events_c.h" | |
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28 #include "../video/SDL_cursor_c.h" |
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29 #include "../video/SDL_sysvideo.h" |
| 0 | 30 |
| 31 | |
| 32 /* These are static for our mouse handling code */ | |
| 1525 | 33 static Sint16 SDL_MouseX = 0; |
| 34 static Sint16 SDL_MouseY = 0; | |
| 0 | 35 static Sint16 SDL_DeltaX = 0; |
| 36 static Sint16 SDL_DeltaY = 0; | |
| 37 static Uint8 SDL_ButtonState = 0; | |
| 38 | |
| 39 | |
| 40 /* Public functions */ | |
| 41 int SDL_MouseInit(void) | |
| 42 { | |
| 43 /* The mouse is at (0,0) */ | |
| 1525 | 44 SDL_MouseX = 0; |
| 45 SDL_MouseY = 0; | |
| 0 | 46 SDL_DeltaX = 0; |
| 47 SDL_DeltaY = 0; | |
| 48 SDL_ButtonState = 0; | |
| 49 | |
| 50 /* That's it! */ | |
| 51 return(0); | |
| 52 } | |
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53 void SDL_MouseQuit(void) |
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54 { |
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55 } |
| 0 | 56 |
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57 /* We lost the mouse, so post button up messages for all pressed buttons */ |
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58 void SDL_ResetMouse(void) |
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59 { |
| 518 | 60 Uint8 i; |
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61 for ( i = 0; i < sizeof(SDL_ButtonState)*8; ++i ) { |
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62 if ( SDL_ButtonState & SDL_BUTTON(i) ) { |
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63 SDL_PrivateMouseButton(SDL_RELEASED, i, 0, 0); |
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64 } |
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65 } |
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66 } |
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67 |
| 0 | 68 Uint8 SDL_GetMouseState (int *x, int *y) |
| 69 { | |
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70 if ( x ) { |
| 1525 | 71 *x = SDL_MouseX; |
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72 } |
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73 if ( y ) { |
| 1525 | 74 *y = SDL_MouseY; |
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75 } |
| 0 | 76 return(SDL_ButtonState); |
| 77 } | |
| 78 | |
| 79 Uint8 SDL_GetRelativeMouseState (int *x, int *y) | |
| 80 { | |
| 81 if ( x ) | |
| 82 *x = SDL_DeltaX; | |
| 83 if ( y ) | |
| 84 *y = SDL_DeltaY; | |
| 85 SDL_DeltaX = 0; | |
| 86 SDL_DeltaY = 0; | |
| 87 return(SDL_ButtonState); | |
| 88 } | |
| 89 | |
| 90 static void ClipOffset(Sint16 *x, Sint16 *y) | |
| 91 { | |
| 92 /* This clips absolute mouse coordinates when the apparent | |
| 93 display surface is smaller than the real display surface. | |
| 94 */ | |
| 95 if ( SDL_VideoSurface->offset ) { | |
| 96 *y -= SDL_VideoSurface->offset/SDL_VideoSurface->pitch; | |
| 97 *x -= (SDL_VideoSurface->offset%SDL_VideoSurface->pitch)/ | |
| 98 SDL_VideoSurface->format->BytesPerPixel; | |
| 99 } | |
| 100 } | |
| 101 | |
| 102 /* These are global for SDL_eventloop.c */ | |
| 103 int SDL_PrivateMouseMotion(Uint8 buttonstate, int relative, Sint16 x, Sint16 y) | |
| 104 { | |
| 105 int posted; | |
| 106 Uint16 X, Y; | |
| 107 Sint16 Xrel; | |
| 108 Sint16 Yrel; | |
| 109 | |
| 110 /* Don't handle mouse motion if there's no cursor surface */ | |
| 111 if ( SDL_VideoSurface == NULL ) { | |
| 112 return(0); | |
| 113 } | |
| 114 | |
| 115 /* Default buttonstate is the current one */ | |
| 116 if ( ! buttonstate ) { | |
| 117 buttonstate = SDL_ButtonState; | |
| 118 } | |
| 119 | |
| 120 Xrel = x; | |
| 121 Yrel = y; | |
| 122 if ( relative ) { | |
| 123 /* Push the cursor around */ | |
| 124 x = (SDL_MouseX+x); | |
| 125 y = (SDL_MouseY+y); | |
| 126 } else { | |
| 127 /* Do we need to clip {x,y} ? */ | |
| 128 ClipOffset(&x, &y); | |
| 129 } | |
| 130 | |
| 131 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ | |
| 132 if ( x < 0 ) | |
| 133 X = 0; | |
| 134 else | |
| 135 if ( x >= SDL_VideoSurface->w ) | |
| 136 X = SDL_VideoSurface->w-1; | |
| 137 else | |
| 138 X = (Uint16)x; | |
| 139 | |
| 140 if ( y < 0 ) | |
| 141 Y = 0; | |
| 142 else | |
| 143 if ( y >= SDL_VideoSurface->h ) | |
| 144 Y = SDL_VideoSurface->h-1; | |
| 145 else | |
| 146 Y = (Uint16)y; | |
| 147 | |
| 148 /* If not relative mode, generate relative motion from clamped X/Y. | |
| 149 This prevents lots of extraneous large delta relative motion when | |
| 150 the screen is windowed mode and the mouse is outside the window. | |
| 151 */ | |
| 1525 | 152 if ( ! relative ) { |
| 0 | 153 Xrel = X-SDL_MouseX; |
| 154 Yrel = Y-SDL_MouseY; | |
| 155 } | |
| 156 | |
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157 /* Drop events that don't change state */ |
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158 if ( ! Xrel && ! Yrel ) { |
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159 #if 0 |
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160 printf("Mouse event didn't change state - dropped!\n"); |
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161 #endif |
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162 return(0); |
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163 } |
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164 |
| 0 | 165 /* Update internal mouse state */ |
| 166 SDL_ButtonState = buttonstate; | |
| 167 SDL_MouseX = X; | |
| 168 SDL_MouseY = Y; | |
| 169 SDL_DeltaX += Xrel; | |
| 170 SDL_DeltaY += Yrel; | |
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171 SDL_MoveCursor(SDL_MouseX, SDL_MouseY); |
| 0 | 172 |
| 173 /* Post the event, if desired */ | |
| 174 posted = 0; | |
| 175 if ( SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE ) { | |
| 176 SDL_Event event; | |
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177 SDL_memset(&event, 0, sizeof(event)); |
| 0 | 178 event.type = SDL_MOUSEMOTION; |
| 179 event.motion.state = buttonstate; | |
| 180 event.motion.x = X; | |
| 181 event.motion.y = Y; | |
| 182 event.motion.xrel = Xrel; | |
| 183 event.motion.yrel = Yrel; | |
| 184 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 185 posted = 1; | |
| 186 SDL_PushEvent(&event); | |
| 187 } | |
| 188 } | |
| 189 return(posted); | |
| 190 } | |
| 191 | |
| 192 int SDL_PrivateMouseButton(Uint8 state, Uint8 button, Sint16 x, Sint16 y) | |
| 193 { | |
| 194 SDL_Event event; | |
| 195 int posted; | |
| 196 int move_mouse; | |
| 197 Uint8 buttonstate; | |
| 198 | |
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199 SDL_memset(&event, 0, sizeof(event)); |
| 0 | 200 |
| 201 /* Check parameters */ | |
| 202 if ( x || y ) { | |
| 203 ClipOffset(&x, &y); | |
| 204 move_mouse = 1; | |
| 205 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ | |
| 206 if ( x < 0 ) | |
| 207 x = 0; | |
| 208 else | |
| 209 if ( x >= SDL_VideoSurface->w ) | |
| 210 x = SDL_VideoSurface->w-1; | |
| 211 | |
| 212 if ( y < 0 ) | |
| 213 y = 0; | |
| 214 else | |
| 215 if ( y >= SDL_VideoSurface->h ) | |
| 216 y = SDL_VideoSurface->h-1; | |
| 217 } else { | |
| 218 move_mouse = 0; | |
| 219 } | |
| 220 if ( ! x ) | |
| 221 x = SDL_MouseX; | |
| 222 if ( ! y ) | |
| 223 y = SDL_MouseY; | |
| 224 | |
| 225 /* Figure out which event to perform */ | |
| 226 buttonstate = SDL_ButtonState; | |
| 227 switch ( state ) { | |
| 228 case SDL_PRESSED: | |
| 229 event.type = SDL_MOUSEBUTTONDOWN; | |
| 230 buttonstate |= SDL_BUTTON(button); | |
| 231 break; | |
| 232 case SDL_RELEASED: | |
| 233 event.type = SDL_MOUSEBUTTONUP; | |
| 234 buttonstate &= ~SDL_BUTTON(button); | |
| 235 break; | |
| 236 default: | |
| 237 /* Invalid state -- bail */ | |
| 238 return(0); | |
| 239 } | |
| 240 | |
| 241 /* Update internal mouse state */ | |
| 242 SDL_ButtonState = buttonstate; | |
| 243 if ( move_mouse ) { | |
| 244 SDL_MouseX = x; | |
| 245 SDL_MouseY = y; | |
| 246 SDL_MoveCursor(SDL_MouseX, SDL_MouseY); | |
| 247 } | |
| 248 | |
| 249 /* Post the event, if desired */ | |
| 250 posted = 0; | |
| 251 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { | |
| 252 event.button.state = state; | |
| 253 event.button.button = button; | |
| 254 event.button.x = x; | |
| 255 event.button.y = y; | |
| 256 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 257 posted = 1; | |
| 258 SDL_PushEvent(&event); | |
| 259 } | |
| 260 } | |
| 261 return(posted); | |
| 262 } | |
| 263 |