e14743d1 |
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 | |