Mercurial > sdl-ios-xcode
annotate src/events/SDL_mouse.c @ 1501:73dc5d39bbf8
Added UTF-8 <-> UTF-16 <-> UTF-32 <-> UCS-2 <-> UCS-4 conversion capability
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 13 Mar 2006 01:08:00 +0000 |
| parents | e3242177fe4a |
| children | 23a347cfbed8 |
| 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 */ | |
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33 static Sint16 SDL_MouseX = -1; |
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34 static Sint16 SDL_MouseY = -1; |
| 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) */ | |
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44 SDL_MouseX = -1; |
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45 SDL_MouseY = -1; |
| 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 ) { |
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71 if ( SDL_MouseX < 0 ) { |
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72 *x = 0; |
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73 } else { |
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74 *x = SDL_MouseX; |
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75 } |
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76 } |
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77 if ( y ) { |
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78 if ( SDL_MouseY < 0 ) { |
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79 *y = 0; |
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80 } else { |
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81 *y = SDL_MouseY; |
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82 } |
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83 } |
| 0 | 84 return(SDL_ButtonState); |
| 85 } | |
| 86 | |
| 87 Uint8 SDL_GetRelativeMouseState (int *x, int *y) | |
| 88 { | |
| 89 if ( x ) | |
| 90 *x = SDL_DeltaX; | |
| 91 if ( y ) | |
| 92 *y = SDL_DeltaY; | |
| 93 SDL_DeltaX = 0; | |
| 94 SDL_DeltaY = 0; | |
| 95 return(SDL_ButtonState); | |
| 96 } | |
| 97 | |
| 98 static void ClipOffset(Sint16 *x, Sint16 *y) | |
| 99 { | |
| 100 /* This clips absolute mouse coordinates when the apparent | |
| 101 display surface is smaller than the real display surface. | |
| 102 */ | |
| 103 if ( SDL_VideoSurface->offset ) { | |
| 104 *y -= SDL_VideoSurface->offset/SDL_VideoSurface->pitch; | |
| 105 *x -= (SDL_VideoSurface->offset%SDL_VideoSurface->pitch)/ | |
| 106 SDL_VideoSurface->format->BytesPerPixel; | |
| 107 } | |
| 108 } | |
| 109 | |
| 110 /* These are global for SDL_eventloop.c */ | |
| 111 int SDL_PrivateMouseMotion(Uint8 buttonstate, int relative, Sint16 x, Sint16 y) | |
| 112 { | |
| 113 int posted; | |
| 114 Uint16 X, Y; | |
| 115 Sint16 Xrel; | |
| 116 Sint16 Yrel; | |
| 117 | |
| 118 /* Don't handle mouse motion if there's no cursor surface */ | |
| 119 if ( SDL_VideoSurface == NULL ) { | |
| 120 return(0); | |
| 121 } | |
| 122 | |
| 123 /* Default buttonstate is the current one */ | |
| 124 if ( ! buttonstate ) { | |
| 125 buttonstate = SDL_ButtonState; | |
| 126 } | |
| 127 | |
| 128 Xrel = x; | |
| 129 Yrel = y; | |
| 130 if ( relative ) { | |
| 131 /* Push the cursor around */ | |
| 132 x = (SDL_MouseX+x); | |
| 133 y = (SDL_MouseY+y); | |
| 134 } else { | |
| 135 /* Do we need to clip {x,y} ? */ | |
| 136 ClipOffset(&x, &y); | |
| 137 } | |
| 138 | |
| 139 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ | |
| 140 if ( x < 0 ) | |
| 141 X = 0; | |
| 142 else | |
| 143 if ( x >= SDL_VideoSurface->w ) | |
| 144 X = SDL_VideoSurface->w-1; | |
| 145 else | |
| 146 X = (Uint16)x; | |
| 147 | |
| 148 if ( y < 0 ) | |
| 149 Y = 0; | |
| 150 else | |
| 151 if ( y >= SDL_VideoSurface->h ) | |
| 152 Y = SDL_VideoSurface->h-1; | |
| 153 else | |
| 154 Y = (Uint16)y; | |
| 155 | |
| 156 /* If not relative mode, generate relative motion from clamped X/Y. | |
| 157 This prevents lots of extraneous large delta relative motion when | |
| 158 the screen is windowed mode and the mouse is outside the window. | |
| 159 */ | |
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160 if ( ! relative && SDL_MouseX >= 0 && SDL_MouseY >= 0 ) { |
| 0 | 161 Xrel = X-SDL_MouseX; |
| 162 Yrel = Y-SDL_MouseY; | |
| 163 } | |
| 164 | |
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165 /* Drop events that don't change state */ |
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166 if ( ! Xrel && ! Yrel ) { |
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167 #if 0 |
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168 printf("Mouse event didn't change state - dropped!\n"); |
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169 #endif |
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170 return(0); |
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171 } |
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172 |
| 0 | 173 /* Update internal mouse state */ |
| 174 SDL_ButtonState = buttonstate; | |
| 175 SDL_MouseX = X; | |
| 176 SDL_MouseY = Y; | |
| 177 SDL_DeltaX += Xrel; | |
| 178 SDL_DeltaY += Yrel; | |
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179 SDL_MoveCursor(SDL_MouseX, SDL_MouseY); |
| 0 | 180 |
| 181 /* Post the event, if desired */ | |
| 182 posted = 0; | |
| 183 if ( SDL_ProcessEvents[SDL_MOUSEMOTION] == SDL_ENABLE ) { | |
| 184 SDL_Event event; | |
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185 SDL_memset(&event, 0, sizeof(event)); |
| 0 | 186 event.type = SDL_MOUSEMOTION; |
| 187 event.motion.state = buttonstate; | |
| 188 event.motion.x = X; | |
| 189 event.motion.y = Y; | |
| 190 event.motion.xrel = Xrel; | |
| 191 event.motion.yrel = Yrel; | |
| 192 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 193 posted = 1; | |
| 194 SDL_PushEvent(&event); | |
| 195 } | |
| 196 } | |
| 197 return(posted); | |
| 198 } | |
| 199 | |
| 200 int SDL_PrivateMouseButton(Uint8 state, Uint8 button, Sint16 x, Sint16 y) | |
| 201 { | |
| 202 SDL_Event event; | |
| 203 int posted; | |
| 204 int move_mouse; | |
| 205 Uint8 buttonstate; | |
| 206 | |
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207 SDL_memset(&event, 0, sizeof(event)); |
| 0 | 208 |
| 209 /* Check parameters */ | |
| 210 if ( x || y ) { | |
| 211 ClipOffset(&x, &y); | |
| 212 move_mouse = 1; | |
| 213 /* Mouse coordinates range from 0 - width-1 and 0 - height-1 */ | |
| 214 if ( x < 0 ) | |
| 215 x = 0; | |
| 216 else | |
| 217 if ( x >= SDL_VideoSurface->w ) | |
| 218 x = SDL_VideoSurface->w-1; | |
| 219 | |
| 220 if ( y < 0 ) | |
| 221 y = 0; | |
| 222 else | |
| 223 if ( y >= SDL_VideoSurface->h ) | |
| 224 y = SDL_VideoSurface->h-1; | |
| 225 } else { | |
| 226 move_mouse = 0; | |
| 227 } | |
| 228 if ( ! x ) | |
| 229 x = SDL_MouseX; | |
| 230 if ( ! y ) | |
| 231 y = SDL_MouseY; | |
| 232 | |
| 233 /* Figure out which event to perform */ | |
| 234 buttonstate = SDL_ButtonState; | |
| 235 switch ( state ) { | |
| 236 case SDL_PRESSED: | |
| 237 event.type = SDL_MOUSEBUTTONDOWN; | |
| 238 buttonstate |= SDL_BUTTON(button); | |
| 239 break; | |
| 240 case SDL_RELEASED: | |
| 241 event.type = SDL_MOUSEBUTTONUP; | |
| 242 buttonstate &= ~SDL_BUTTON(button); | |
| 243 break; | |
| 244 default: | |
| 245 /* Invalid state -- bail */ | |
| 246 return(0); | |
| 247 } | |
| 248 | |
| 249 /* Update internal mouse state */ | |
| 250 SDL_ButtonState = buttonstate; | |
| 251 if ( move_mouse ) { | |
| 252 SDL_MouseX = x; | |
| 253 SDL_MouseY = y; | |
| 254 SDL_MoveCursor(SDL_MouseX, SDL_MouseY); | |
| 255 } | |
| 256 | |
| 257 /* Post the event, if desired */ | |
| 258 posted = 0; | |
| 259 if ( SDL_ProcessEvents[event.type] == SDL_ENABLE ) { | |
| 260 event.button.state = state; | |
| 261 event.button.button = button; | |
| 262 event.button.x = x; | |
| 263 event.button.y = y; | |
| 264 if ( (SDL_EventOK == NULL) || (*SDL_EventOK)(&event) ) { | |
| 265 posted = 1; | |
| 266 SDL_PushEvent(&event); | |
| 267 } | |
| 268 } | |
| 269 return(posted); | |
| 270 } | |
| 271 |