| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 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 |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | /* General mouse handling code for SDL */ |
| 25 | |
| 26 | #include "SDL_events.h" |
| 27 | #include "SDL_events_c.h" |
| 28 | #include "../video/SDL_cursor_c.h" |
| 29 | #include "../video/SDL_sysvideo.h" |
| 30 | |
| 31 | |
| 32 | /* These are static for our mouse handling code */ |
| 33 | static Sint16 SDL_MouseX = 0; |
| 34 | static Sint16 SDL_MouseY = 0; |
| 35 | static Sint16 SDL_DeltaX = 0; |
| 36 | static Sint16 SDL_DeltaY = 0; |
| 37 | static Sint16 SDL_MouseMaxX = 0; |
| 38 | static Sint16 SDL_MouseMaxY = 0; |
| 39 | static Uint8 SDL_ButtonState = 0; |
| 40 | |
| 41 | |
| 42 | /* Public functions */ |
| 43 | int SDL_MouseInit(void) |
| 44 | { |
| 45 | /* The mouse is at (0,0) */ |
| 46 | SDL_MouseX = 0; |
| 47 | SDL_MouseY = 0; |
| 48 | SDL_DeltaX = 0; |
| 49 | SDL_DeltaY = 0; |
| 50 | SDL_MouseMaxX = 0; |
| 51 | SDL_MouseMaxY = 0; |
| 52 | SDL_ButtonState = 0; |
| 53 | |
| 54 | /* That's it! */ |
| 55 | return(0); |
| 56 | } |
| 57 | void SDL_MouseQuit(void) |
| 58 | { |
| 59 | } |
| 60 | |
| 61 | /* We lost the mouse, so post button up messages for all pressed buttons */ |
| 62 | void SDL_ResetMouse(void) |
| 63 | { |
| 64 | Uint8 i; |
| 65 | for ( i = 0; i < sizeof(SDL_ButtonState)*8; ++i ) { |
| 66 | if ( SDL_ButtonState & SDL_BUTTON(i) ) { |
| 67 | SDL_PrivateMouseButton(SDL_RELEASED, i, 0, 0); |
| 68 | } |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | Uint8 SDL_GetMouseState (int *x, int *y) |
| 73 | { |
| 74 | if ( x ) { |
| 75 | *x = SDL_MouseX; |
| 76 | } |
| 77 | if ( y ) { |
| 78 | *y = SDL_MouseY; |
| 79 | } |
| 80 | return(SDL_ButtonState); |
| 81 | } |
| 82 | |
| 83 | Uint8 SDL_GetRelativeMouseState (int *x, int *y) |
| 84 | { |
| 85 | if ( x ) |
| 86 | *x = SDL_DeltaX; |
| 87 | if ( y ) |
| 88 | *y = SDL_DeltaY; |
| 89 | SDL_DeltaX = 0; |
| 90 | SDL_DeltaY = 0; |
| 91 | return(SDL_ButtonState); |
| 92 | } |
| 93 | |
| 94 | static void ClipOffset(Sint16 *x, Sint16 *y) |
| 95 | { |
| 96 | /* This clips absolute mouse coordinates when the apparent |
| 97 | display surface is smaller than the real display surface. |
| 98 | */ |
| 99 | if ( SDL_VideoSurface && SDL_VideoSurface->offset ) { |
| 100 | *y -= SDL_VideoSurface->offset/SDL_VideoSurface->pitch; |
| 101 | *x -= (SDL_VideoSurface->offset%SDL_VideoSurface->pitch)/ |
| 102 | SDL_VideoSurface->format->BytesPerPixel; |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | void SDL_SetMouseRange(int maxX, int maxY) |
| 107 | { |
| 108 | SDL_MouseMaxX = (Sint16)maxX; |
| 109 | SDL_MouseMaxY = (Sint16)maxY; |
| 110 | } |
| 111 | |
| 112 | /* These are global for SDL_eventloop.c */ |
| 113 | int SDL_PrivateMouseMotion(Uint8 buttonstate, int relative, Sint16 x, Sint16 y) |
| 114 | { |
| 115 | int posted; |
| 116 | Uint16 X, Y; |
| 117 | Sint16 Xrel; |
| 118 | Sint16 Yrel; |
| 119 | |
| 120 | /* Default buttonstate is the current one */ |
| 121 | if ( ! buttonstate ) { |
| 122 | buttonstate = SDL_ButtonState; |
| 123 | } |
| 124 | |
| 125 | Xrel = x; |
| 126 | Yrel = y; |
| 127 | if ( relative ) { |
| 128 | /* Push the cursor around */ |
| 129 | x = (SDL_MouseX+x); |
| 130 | y = (SDL_MouseY+y); |
| 131 | } else { |
| 132 | /* Do we need to clip {x,y} ? */ |
| 133 | ClipOffset(&x, &y); |
| 134 | } |
| 135 | |
| 136 | /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ |
| 137 | if ( x < 0 ) |
| 138 | X = 0; |
| 139 | else |
| 140 | if ( x >= SDL_MouseMaxX ) |
| 141 | X = SDL_MouseMaxX-1; |
| 142 | else |
| 143 | X = (Uint16)x; |
| 144 | |
| 145 | if ( y < 0 ) |
| 146 | Y = 0; |
| 147 | else |
| 148 | if ( y >= SDL_MouseMaxY ) |
| 149 | Y = SDL_MouseMaxY-1; |
| 150 | else |
| 151 | Y = (Uint16)y; |
| 152 | |
| 153 | /* If not relative mode, generate relative motion from clamped X/Y. |
| 154 | This prevents lots of extraneous large delta relative motion when |
| 155 | the screen is windowed mode and the mouse is outside the window. |
| 156 | */ |
| 157 | if ( ! relative ) { |
| 158 | Xrel = X-SDL_MouseX; |
| 159 | Yrel = Y-SDL_MouseY; |
| 160 | } |
| 161 | |
| 162 | /* Drop events that don't change state */ |
| 163 | if ( ! Xrel && ! Yrel ) { |
| 164 | #if 0 |
| 165 | printf("Mouse event didn't change state - dropped!\n"); |
| 166 | #endif |
| 167 | return(0); |
| 168 | } |
| 169 | |
| 170 | /* Update internal mouse state */ |
| 171 | SDL_ButtonState = buttonstate; |
| 172 | SDL_MouseX = X; |
| 173 | SDL_MouseY = Y; |
| 174 | SDL_DeltaX += Xrel; |
| 175 | SDL_DeltaY += Yrel; |
| 176 | SDL_MoveCursor(SDL_MouseX, SDL_MouseY); |
| 177 | |
| 178 | /* Post the event, if desired */ |
| 179 | posted = 0; |
| 180 | if ( SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE ) { |
| 181 | SDL_Event event; |
| 182 | SDL_memset(&event, 0, sizeof(event)); |
| 183 | event.type = SDL_MOUSEMOTION; |
| 184 | event.motion.state = buttonstate; |
| 185 | event.motion.x = X; |
| 186 | event.motion.y = Y; |
| 187 | event.motion.xrel = Xrel; |
| 188 | event.motion.yrel = Yrel; |
| 189 | if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { |
| 190 | posted = 1; |
| 191 | SDL_PushEvent(&event); |
| 192 | } |
| 193 | } |
| 194 | return(posted); |
| 195 | } |
| 196 | |
| 197 | int SDL_PrivateMouseButton(Uint8 state, Uint8 button, Sint16 x, Sint16 y) |
| 198 | { |
| 199 | SDL_Event event; |
| 200 | int posted; |
| 201 | int move_mouse; |
| 202 | Uint8 buttonstate; |
| 203 | |
| 204 | SDL_memset(&event, 0, sizeof(event)); |
| 205 | |
| 206 | /* Check parameters */ |
| 207 | if ( x || y ) { |
| 208 | ClipOffset(&x, &y); |
| 209 | move_mouse = 1; |
| 210 | /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ |
| 211 | if ( x < 0 ) |
| 212 | x = 0; |
| 213 | else |
| 214 | if ( x >= SDL_MouseMaxX ) |
| 215 | x = SDL_MouseMaxX-1; |
| 216 | |
| 217 | if ( y < 0 ) |
| 218 | y = 0; |
| 219 | else |
| 220 | if ( y >= SDL_MouseMaxY ) |
| 221 | y = SDL_MouseMaxY-1; |
| 222 | } else { |
| 223 | move_mouse = 0; |
| 224 | } |
| 225 | if ( ! x ) |
| 226 | x = SDL_MouseX; |
| 227 | if ( ! y ) |
| 228 | y = SDL_MouseY; |
| 229 | |
| 230 | /* Figure out which event to perform */ |
| 231 | buttonstate = SDL_ButtonState; |
| 232 | switch ( state ) { |
| 233 | case SDL_PRESSED: |
| 234 | event.type = SDL_MOUSEBUTTONDOWN; |
| 235 | buttonstate |= SDL_BUTTON(button); |
| 236 | break; |
| 237 | case SDL_RELEASED: |
| 238 | event.type = SDL_MOUSEBUTTONUP; |
| 239 | buttonstate &= ~SDL_BUTTON(button); |
| 240 | break; |
| 241 | default: |
| 242 | /* Invalid state -- bail */ |
| 243 | return(0); |
| 244 | } |
| 245 | |
| 246 | /* Update internal mouse state */ |
| 247 | SDL_ButtonState = buttonstate; |
| 248 | if ( move_mouse ) { |
| 249 | SDL_MouseX = x; |
| 250 | SDL_MouseY = y; |
| 251 | SDL_MoveCursor(SDL_MouseX, SDL_MouseY); |
| 252 | } |
| 253 | |
| 254 | /* Post the event, if desired */ |
| 255 | posted = 0; |
| 256 | if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { |
| 257 | event.button.state = state; |
| 258 | event.button.button = button; |
| 259 | event.button.x = x; |
| 260 | event.button.y = y; |
| 261 | if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { |
| 262 | posted = 1; |
| 263 | SDL_PushEvent(&event); |
| 264 | } |
| 265 | } |
| 266 | return(posted); |
| 267 | } |
| 268 | |