Mercurial > sdl-ios-xcode
annotate src/events/SDL_mouse.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | f214b6fae45a |
| children | 450721ad5436 |
| 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 <stdio.h> | |
| 26 #include <stdlib.h> | |
| 27 #include <string.h> | |
| 28 | |
| 29 #include "SDL_events.h" | |
| 30 #include "SDL_events_c.h" | |
| 31 #include "SDL_cursor_c.h" | |
| 32 #include "SDL_sysvideo.h" | |
| 33 | |
| 34 | |
| 35 /* These are static for our mouse handling code */ | |
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36 static Sint16 SDL_MouseX = -1; |
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37 static Sint16 SDL_MouseY = -1; |
| 0 | 38 static Sint16 SDL_DeltaX = 0; |
| 39 static Sint16 SDL_DeltaY = 0; | |
| 40 static Uint8 SDL_ButtonState = 0; | |
| 41 | |
| 42 | |
| 43 /* Public functions */ | |
| 44 int SDL_MouseInit(void) | |
| 45 { | |
| 46 /* The mouse is at (0,0) */ | |
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47 SDL_MouseX = -1; |
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48 SDL_MouseY = -1; |
| 0 | 49 SDL_DeltaX = 0; |
| 50 SDL_DeltaY = 0; | |
| 51 SDL_ButtonState = 0; | |
| 52 | |
| 53 /* That's it! */ | |
| 54 return(0); | |
| 55 } | |
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56 void SDL_MouseQuit(void) |
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57 { |
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58 } |
| 0 | 59 |
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60 /* We lost the mouse, so post button up messages for all pressed buttons */ |
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61 void SDL_ResetMouse(void) |
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62 { |
| 518 | 63 Uint8 i; |
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64 for ( i = 0; i < sizeof(SDL_ButtonState)*8; ++i ) { |
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65 if ( SDL_ButtonState & SDL_BUTTON(i) ) { |
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66 SDL_PrivateMouseButton(SDL_RELEASED, i, 0, 0); |
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67 } |
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68 } |
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69 } |
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70 |
| 0 | 71 Uint8 SDL_GetMouseState (int *x, int *y) |
| 72 { | |
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73 if ( x ) { |
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74 if ( SDL_MouseX < 0 ) { |
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75 *x = 0; |
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76 } else { |
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77 *x = SDL_MouseX; |
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78 } |
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79 } |
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80 if ( y ) { |
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81 if ( SDL_MouseY < 0 ) { |
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82 *y = 0; |
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83 } else { |
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84 *y = SDL_MouseY; |
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85 } |
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86 } |
| 0 | 87 return(SDL_ButtonState); |
| 88 } | |
| 89 | |
| 90 Uint8 SDL_GetRelativeMouseState (int *x, int *y) | |
| 91 { | |
| 92 if ( x ) | |
| 93 *x = SDL_DeltaX; | |
| 94 if ( y ) | |
| 95 *y = SDL_DeltaY; | |
| 96 SDL_DeltaX = 0; | |
| 97 SDL_DeltaY = 0; | |
| 98 return(SDL_ButtonState); | |
| 99 } | |
| 100 | |
| 101 static void ClipOffset(Sint16 *x, Sint16 *y) | |
| 102 { | |
| 103 /* This clips absolute mouse coordinates when the apparent | |
| 104 display surface is smaller than the real display surface. | |
| 105 */ | |
| 106 if ( SDL_VideoSurface->offset ) { | |
| 107 *y -= SDL_VideoSurface->offset/SDL_VideoSurface->pitch; | |
| 108 *x -= (SDL_VideoSurface->offset%SDL_VideoSurface->pitch)/ | |
| 109 SDL_VideoSurface->format->BytesPerPixel; | |
| 110 } | |
| 111 } | |
| 112 | |
| 113 /* These are global for SDL_eventloop.c */ | |
| 114 int SDL_PrivateMouseMotion(Uint8 buttonstate, int relative, Sint16 x, Sint16 y) | |
| 115 { | |
| 116 int posted; | |
| 117 Uint16 X, Y; | |
| 118 Sint16 Xrel; | |
| 119 Sint16 Yrel; | |
| 120 | |
| 121 /* Don't handle mouse motion if there's no cursor surface */ | |
| 122 if ( SDL_VideoSurface == NULL ) { | |
| 123 return(0); | |
| 124 } | |
| 125 | |
| 126 /* Default buttonstate is the current one */ | |
| 127 if ( ! buttonstate ) { | |
| 128 buttonstate = SDL_ButtonState; | |
| 129 } | |
| 130 | |
| 131 Xrel = x; | |
| 132 Yrel = y; | |
| 133 if ( relative ) { | |
| 134 /* Push the cursor around */ | |
| 135 x = (SDL_MouseX+x); | |
| 136 y = (SDL_MouseY+y); | |
| 137 } else { | |
| 138 /* Do we need to clip {x,y} ? */ | |
| 139 ClipOffset(&x, &y); | |
| 140 } | |
| 141 | |
| 142 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ | |
| 143 if ( x < 0 ) | |
| 144 X = 0; | |
| 145 else | |
| 146 if ( x >= SDL_VideoSurface->w ) | |
| 147 X = SDL_VideoSurface->w-1; | |
| 148 else | |
| 149 X = (Uint16)x; | |
| 150 | |
| 151 if ( y < 0 ) | |
| 152 Y = 0; | |
| 153 else | |
| 154 if ( y >= SDL_VideoSurface->h ) | |
| 155 Y = SDL_VideoSurface->h-1; | |
| 156 else | |
| 157 Y = (Uint16)y; | |
| 158 | |
| 159 /* If not relative mode, generate relative motion from clamped X/Y. | |
| 160 This prevents lots of extraneous large delta relative motion when | |
| 161 the screen is windowed mode and the mouse is outside the window. | |
| 162 */ | |
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163 if ( ! relative && SDL_MouseX >= 0 && SDL_MouseY >= 0 ) { |
| 0 | 164 Xrel = X-SDL_MouseX; |
| 165 Yrel = Y-SDL_MouseY; | |
| 166 } | |
| 167 | |
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168 /* Drop events that don't change state */ |
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169 if ( ! Xrel && ! Yrel ) { |
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170 #if 0 |
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171 printf("Mouse event didn't change state - dropped!\n"); |
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172 #endif |
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173 return(0); |
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174 } |
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175 |
| 0 | 176 /* Update internal mouse state */ |
| 177 SDL_ButtonState = buttonstate; | |
| 178 SDL_MouseX = X; | |
| 179 SDL_MouseY = Y; | |
| 180 SDL_DeltaX += Xrel; | |
| 181 SDL_DeltaY += Yrel; | |
| 182 SDL_MoveCursor(SDL_MouseX, SDL_MouseY); | |
| 183 | |
| 184 /* Post the event, if desired */ | |
| 185 posted = 0; | |
| 186 if ( SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE ) { | |
| 187 SDL_Event event; | |
| 188 memset(&event, 0, sizeof(event)); | |
| 189 event.type = SDL_MOUSEMOTION; | |
| 190 event.motion.state = buttonstate; | |
| 191 event.motion.x = X; | |
| 192 event.motion.y = Y; | |
| 193 event.motion.xrel = Xrel; | |
| 194 event.motion.yrel = Yrel; | |
| 195 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 196 posted = 1; | |
| 197 SDL_PushEvent(&event); | |
| 198 } | |
| 199 } | |
| 200 return(posted); | |
| 201 } | |
| 202 | |
| 203 int SDL_PrivateMouseButton(Uint8 state, Uint8 button, Sint16 x, Sint16 y) | |
| 204 { | |
| 205 SDL_Event event; | |
| 206 int posted; | |
| 207 int move_mouse; | |
| 208 Uint8 buttonstate; | |
| 209 | |
| 210 memset(&event, 0, sizeof(event)); | |
| 211 | |
| 212 /* Check parameters */ | |
| 213 if ( x || y ) { | |
| 214 ClipOffset(&x, &y); | |
| 215 move_mouse = 1; | |
| 216 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ | |
| 217 if ( x < 0 ) | |
| 218 x = 0; | |
| 219 else | |
| 220 if ( x >= SDL_VideoSurface->w ) | |
| 221 x = SDL_VideoSurface->w-1; | |
| 222 | |
| 223 if ( y < 0 ) | |
| 224 y = 0; | |
| 225 else | |
| 226 if ( y >= SDL_VideoSurface->h ) | |
| 227 y = SDL_VideoSurface->h-1; | |
| 228 } else { | |
| 229 move_mouse = 0; | |
| 230 } | |
| 231 if ( ! x ) | |
| 232 x = SDL_MouseX; | |
| 233 if ( ! y ) | |
| 234 y = SDL_MouseY; | |
| 235 | |
| 236 /* Figure out which event to perform */ | |
| 237 buttonstate = SDL_ButtonState; | |
| 238 switch ( state ) { | |
| 239 case SDL_PRESSED: | |
| 240 event.type = SDL_MOUSEBUTTONDOWN; | |
| 241 buttonstate |= SDL_BUTTON(button); | |
| 242 break; | |
| 243 case SDL_RELEASED: | |
| 244 event.type = SDL_MOUSEBUTTONUP; | |
| 245 buttonstate &= ~SDL_BUTTON(button); | |
| 246 break; | |
| 247 default: | |
| 248 /* Invalid state -- bail */ | |
| 249 return(0); | |
| 250 } | |
| 251 | |
| 252 /* Update internal mouse state */ | |
| 253 SDL_ButtonState = buttonstate; | |
| 254 if ( move_mouse ) { | |
| 255 SDL_MouseX = x; | |
| 256 SDL_MouseY = y; | |
| 257 SDL_MoveCursor(SDL_MouseX, SDL_MouseY); | |
| 258 } | |
| 259 | |
| 260 /* Post the event, if desired */ | |
| 261 posted = 0; | |
| 262 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { | |
| 263 event.button.state = state; | |
| 264 event.button.button = button; | |
| 265 event.button.x = x; | |
| 266 event.button.y = y; | |
| 267 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 268 posted = 1; | |
| 269 SDL_PushEvent(&event); | |
| 270 } | |
| 271 } | |
| 272 return(posted); | |
| 273 } | |
| 274 |