Mercurial > sdl-ios-xcode
annotate src/events/SDL_mouse.c @ 844:cd0c77df70a4
*** empty log message ***
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 18 Feb 2004 03:57:13 +0000 |
| parents | b8d311d90021 |
| children | 715c32d8f26c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 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 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
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Updated the source with the correct e-mail address
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* General mouse handling code for SDL */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <stdlib.h> | |
| 32 #include <string.h> | |
| 33 | |
| 34 #include "SDL_events.h" | |
| 35 #include "SDL_events_c.h" | |
| 36 #include "SDL_cursor_c.h" | |
| 37 #include "SDL_sysvideo.h" | |
| 38 | |
| 39 | |
| 40 /* These are static for our mouse handling code */ | |
| 41 static Sint16 SDL_MouseX = 0; | |
| 42 static Sint16 SDL_MouseY = 0; | |
| 43 static Sint16 SDL_DeltaX = 0; | |
| 44 static Sint16 SDL_DeltaY = 0; | |
| 45 static Uint8 SDL_ButtonState = 0; | |
| 46 | |
| 47 | |
| 48 /* Public functions */ | |
| 49 int SDL_MouseInit(void) | |
| 50 { | |
| 51 /* The mouse is at (0,0) */ | |
| 52 SDL_MouseX = 0; | |
| 53 SDL_MouseY = 0; | |
| 54 SDL_DeltaX = 0; | |
| 55 SDL_DeltaY = 0; | |
| 56 SDL_ButtonState = 0; | |
| 57 | |
| 58 /* That's it! */ | |
| 59 return(0); | |
| 60 } | |
| 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 { |
| 518 | 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 |
| 0 | 73 Uint8 SDL_GetMouseState (int *x, int *y) |
| 74 { | |
| 75 if ( x ) | |
| 76 *x = SDL_MouseX; | |
| 77 if ( y ) | |
| 78 *y = SDL_MouseY; | |
| 79 return(SDL_ButtonState); | |
| 80 } | |
| 81 | |
| 82 Uint8 SDL_GetRelativeMouseState (int *x, int *y) | |
| 83 { | |
| 84 if ( x ) | |
| 85 *x = SDL_DeltaX; | |
| 86 if ( y ) | |
| 87 *y = SDL_DeltaY; | |
| 88 SDL_DeltaX = 0; | |
| 89 SDL_DeltaY = 0; | |
| 90 return(SDL_ButtonState); | |
| 91 } | |
| 92 | |
| 93 static void ClipOffset(Sint16 *x, Sint16 *y) | |
| 94 { | |
| 95 /* This clips absolute mouse coordinates when the apparent | |
| 96 display surface is smaller than the real display surface. | |
| 97 */ | |
| 98 if ( SDL_VideoSurface->offset ) { | |
| 99 *y -= SDL_VideoSurface->offset/SDL_VideoSurface->pitch; | |
| 100 *x -= (SDL_VideoSurface->offset%SDL_VideoSurface->pitch)/ | |
| 101 SDL_VideoSurface->format->BytesPerPixel; | |
| 102 } | |
| 103 } | |
| 104 | |
| 105 /* These are global for SDL_eventloop.c */ | |
| 106 int SDL_PrivateMouseMotion(Uint8 buttonstate, int relative, Sint16 x, Sint16 y) | |
| 107 { | |
| 108 int posted; | |
| 109 Uint16 X, Y; | |
| 110 Sint16 Xrel; | |
| 111 Sint16 Yrel; | |
| 112 | |
| 113 /* Don't handle mouse motion if there's no cursor surface */ | |
| 114 if ( SDL_VideoSurface == NULL ) { | |
| 115 return(0); | |
| 116 } | |
| 117 | |
| 118 /* Default buttonstate is the current one */ | |
| 119 if ( ! buttonstate ) { | |
| 120 buttonstate = SDL_ButtonState; | |
| 121 } | |
| 122 | |
| 123 Xrel = x; | |
| 124 Yrel = y; | |
| 125 if ( relative ) { | |
| 126 /* Push the cursor around */ | |
| 127 x = (SDL_MouseX+x); | |
| 128 y = (SDL_MouseY+y); | |
| 129 } else { | |
| 130 /* Do we need to clip {x,y} ? */ | |
| 131 ClipOffset(&x, &y); | |
| 132 } | |
| 133 | |
| 134 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ | |
| 135 if ( x < 0 ) | |
| 136 X = 0; | |
| 137 else | |
| 138 if ( x >= SDL_VideoSurface->w ) | |
| 139 X = SDL_VideoSurface->w-1; | |
| 140 else | |
| 141 X = (Uint16)x; | |
| 142 | |
| 143 if ( y < 0 ) | |
| 144 Y = 0; | |
| 145 else | |
| 146 if ( y >= SDL_VideoSurface->h ) | |
| 147 Y = SDL_VideoSurface->h-1; | |
| 148 else | |
| 149 Y = (Uint16)y; | |
| 150 | |
| 151 /* If not relative mode, generate relative motion from clamped X/Y. | |
| 152 This prevents lots of extraneous large delta relative motion when | |
| 153 the screen is windowed mode and the mouse is outside the window. | |
| 154 */ | |
| 155 if ( ! relative ) { | |
| 156 Xrel = X-SDL_MouseX; | |
| 157 Yrel = Y-SDL_MouseY; | |
| 158 } | |
| 159 | |
| 160 /* Update internal mouse state */ | |
| 161 SDL_ButtonState = buttonstate; | |
| 162 SDL_MouseX = X; | |
| 163 SDL_MouseY = Y; | |
| 164 SDL_DeltaX += Xrel; | |
| 165 SDL_DeltaY += Yrel; | |
| 166 SDL_MoveCursor(SDL_MouseX, SDL_MouseY); | |
| 167 | |
| 168 /* Post the event, if desired */ | |
| 169 posted = 0; | |
| 170 if ( SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE ) { | |
| 171 SDL_Event event; | |
| 172 memset(&event, 0, sizeof(event)); | |
| 173 event.type = SDL_MOUSEMOTION; | |
| 174 event.motion.state = buttonstate; | |
| 175 event.motion.x = X; | |
| 176 event.motion.y = Y; | |
| 177 event.motion.xrel = Xrel; | |
| 178 event.motion.yrel = Yrel; | |
| 179 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 180 posted = 1; | |
| 181 SDL_PushEvent(&event); | |
| 182 } | |
| 183 } | |
| 184 return(posted); | |
| 185 } | |
| 186 | |
| 187 int SDL_PrivateMouseButton(Uint8 state, Uint8 button, Sint16 x, Sint16 y) | |
| 188 { | |
| 189 SDL_Event event; | |
| 190 int posted; | |
| 191 int move_mouse; | |
| 192 Uint8 buttonstate; | |
| 193 | |
| 194 memset(&event, 0, sizeof(event)); | |
| 195 | |
| 196 /* Check parameters */ | |
| 197 if ( x || y ) { | |
| 198 ClipOffset(&x, &y); | |
| 199 move_mouse = 1; | |
| 200 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ | |
| 201 if ( x < 0 ) | |
| 202 x = 0; | |
| 203 else | |
| 204 if ( x >= SDL_VideoSurface->w ) | |
| 205 x = SDL_VideoSurface->w-1; | |
| 206 | |
| 207 if ( y < 0 ) | |
| 208 y = 0; | |
| 209 else | |
| 210 if ( y >= SDL_VideoSurface->h ) | |
| 211 y = SDL_VideoSurface->h-1; | |
| 212 } else { | |
| 213 move_mouse = 0; | |
| 214 } | |
| 215 if ( ! x ) | |
| 216 x = SDL_MouseX; | |
| 217 if ( ! y ) | |
| 218 y = SDL_MouseY; | |
| 219 | |
| 220 /* Figure out which event to perform */ | |
| 221 buttonstate = SDL_ButtonState; | |
| 222 switch ( state ) { | |
| 223 case SDL_PRESSED: | |
| 224 event.type = SDL_MOUSEBUTTONDOWN; | |
| 225 buttonstate |= SDL_BUTTON(button); | |
| 226 break; | |
| 227 case SDL_RELEASED: | |
| 228 event.type = SDL_MOUSEBUTTONUP; | |
| 229 buttonstate &= ~SDL_BUTTON(button); | |
| 230 break; | |
| 231 default: | |
| 232 /* Invalid state -- bail */ | |
| 233 return(0); | |
| 234 } | |
| 235 | |
| 236 /* Update internal mouse state */ | |
| 237 SDL_ButtonState = buttonstate; | |
| 238 if ( move_mouse ) { | |
| 239 SDL_MouseX = x; | |
| 240 SDL_MouseY = y; | |
| 241 SDL_MoveCursor(SDL_MouseX, SDL_MouseY); | |
| 242 } | |
| 243 | |
| 244 /* Post the event, if desired */ | |
| 245 posted = 0; | |
| 246 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { | |
| 247 event.button.state = state; | |
| 248 event.button.button = button; | |
| 249 event.button.x = x; | |
| 250 event.button.y = y; | |
| 251 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 252 posted = 1; | |
| 253 SDL_PushEvent(&event); | |
| 254 } | |
| 255 } | |
| 256 return(posted); | |
| 257 } | |
| 258 |