This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_mouse.c
495 lines (419 loc) · 11.1 KB
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2011 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
11
12
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13
Lesser General Public License for more details.
14
15
16
17
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
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
25
26
27
/* General mouse handling code for SDL */
#include "SDL_events.h"
#include "SDL_events_c.h"
28
#include "default_cursor.h"
29
#include "../video/SDL_sysvideo.h"
30
31
32
/* The mouse state */
33
static SDL_Mouse SDL_mouse;
34
35
36
/* Public functions */
37
int
38
SDL_MouseInit(void)
39
{
40
41
42
43
SDL_Mouse *mouse = SDL_GetMouse();
mouse->cursor_shown = SDL_TRUE;
44
return (0);
45
46
}
47
48
49
50
51
52
SDL_Mouse *
SDL_GetMouse(void)
{
return &SDL_mouse;
}
53
SDL_Window *
54
SDL_GetMouseFocus(void)
55
{
56
SDL_Mouse *mouse = SDL_GetMouse();
57
58
return mouse->focus;
59
60
}
61
void
62
SDL_SetMouseFocus(SDL_Window * window)
63
{
64
SDL_Mouse *mouse = SDL_GetMouse();
65
66
if (mouse->focus == window) {
67
68
69
70
71
return;
}
/* See if the current window has lost focus */
if (mouse->focus) {
72
SDL_SendWindowEvent(mouse->focus, SDL_WINDOWEVENT_LEAVE, 0, 0);
73
74
}
75
mouse->focus = window;
76
77
if (mouse->focus) {
78
SDL_SendWindowEvent(mouse->focus, SDL_WINDOWEVENT_ENTER, 0, 0);
79
80
81
82
}
}
int
83
SDL_SendMouseMotion(SDL_Window * window, int relative, int x, int y)
84
{
85
SDL_Mouse *mouse = SDL_GetMouse();
86
87
88
int posted;
int xrel;
int yrel;
89
int x_max = 0, y_max = 0;
90
91
92
93
94
if (window) {
SDL_SetMouseFocus(window);
}
95
/* the relative motion is calculated regarding the system cursor last position */
96
97
98
if (relative) {
xrel = x;
yrel = y;
99
100
x = (mouse->last_x + x);
y = (mouse->last_y + y);
101
} else {
102
103
xrel = x - mouse->last_x;
yrel = y - mouse->last_y;
104
}
105
106
107
/* Drop events that don't change state */
if (!xrel && !yrel) {
108
#if 0
109
printf("Mouse event didn't change state - dropped!\n");
110
#endif
111
112
113
return 0;
}
114
115
/* Update internal mouse coordinates */
if (mouse->relative_mode == SDL_FALSE) {
116
117
mouse->x = x;
mouse->y = y;
118
} else {
119
120
121
mouse->x += xrel;
mouse->y += yrel;
}
122
123
SDL_GetWindowSize(mouse->focus, &x_max, &y_max);
124
125
--x_max;
--y_max;
126
127
128
/* make sure that the pointers find themselves inside the windows */
/* only check if mouse->xmax is set ! */
129
if (mouse->x > x_max) {
130
mouse->x = x_max;
131
132
}
if (mouse->x < 0) {
133
134
135
mouse->x = 0;
}
136
if (mouse->y > y_max) {
137
mouse->y = y_max;
138
139
}
if (mouse->y < 0) {
140
mouse->y = 0;
141
}
142
143
144
145
mouse->xdelta += xrel;
mouse->ydelta += yrel;
146
#if 0 /* FIXME */
147
148
149
150
151
/* Move the mouse cursor, if needed */
if (mouse->cursor_shown && !mouse->relative_mode &&
mouse->MoveCursor && mouse->cur_cursor) {
mouse->MoveCursor(mouse->cur_cursor);
}
152
#endif
153
154
155
/* Post the event, if desired */
posted = 0;
156
if (SDL_GetEventState(SDL_MOUSEMOTION) == SDL_ENABLE) {
157
158
SDL_Event event;
event.motion.type = SDL_MOUSEMOTION;
159
event.motion.windowID = mouse->focus ? mouse->focus->id : 0;
160
161
162
event.motion.state = mouse->buttonstate;
event.motion.x = mouse->x;
event.motion.y = mouse->y;
163
164
event.motion.xrel = xrel;
event.motion.yrel = yrel;
165
166
posted = (SDL_PushEvent(&event) > 0);
}
167
168
mouse->last_x = mouse->x;
mouse->last_y = mouse->y;
169
170
171
172
return posted;
}
int
173
SDL_SendMouseButton(SDL_Window * window, Uint8 state, Uint8 button)
174
{
175
SDL_Mouse *mouse = SDL_GetMouse();
176
int posted;
177
Uint32 type;
178
179
180
181
182
if (window) {
SDL_SetMouseFocus(window);
}
183
184
185
186
187
188
189
190
191
192
193
/* Figure out which event to perform */
switch (state) {
case SDL_PRESSED:
if (mouse->buttonstate & SDL_BUTTON(button)) {
/* Ignore this event, no state change */
return 0;
}
type = SDL_MOUSEBUTTONDOWN;
mouse->buttonstate |= SDL_BUTTON(button);
break;
case SDL_RELEASED:
194
if (!(mouse->buttonstate & SDL_BUTTON(button))) {
195
196
197
/* Ignore this event, no state change */
return 0;
}
198
199
200
201
202
203
204
205
206
207
type = SDL_MOUSEBUTTONUP;
mouse->buttonstate &= ~SDL_BUTTON(button);
break;
default:
/* Invalid state -- bail */
return 0;
}
/* Post the event, if desired */
posted = 0;
208
if (SDL_GetEventState(type) == SDL_ENABLE) {
209
210
211
212
213
214
SDL_Event event;
event.type = type;
event.button.state = state;
event.button.button = button;
event.button.x = mouse->x;
event.button.y = mouse->y;
215
event.button.windowID = mouse->focus ? mouse->focus->id : 0;
216
217
218
219
220
221
posted = (SDL_PushEvent(&event) > 0);
}
return posted;
}
int
222
SDL_SendMouseWheel(SDL_Window * window, int x, int y)
223
{
224
SDL_Mouse *mouse = SDL_GetMouse();
225
226
int posted;
227
228
229
230
if (window) {
SDL_SetMouseFocus(window);
}
231
if (!x && !y) {
232
233
234
235
236
return 0;
}
/* Post the event, if desired */
posted = 0;
237
if (SDL_GetEventState(SDL_MOUSEWHEEL) == SDL_ENABLE) {
238
239
SDL_Event event;
event.type = SDL_MOUSEWHEEL;
240
event.wheel.windowID = mouse->focus ? mouse->focus->id : 0;
241
242
event.wheel.x = x;
event.wheel.y = y;
243
244
245
246
247
248
posted = (SDL_PushEvent(&event) > 0);
}
return posted;
}
void
249
SDL_MouseQuit(void)
250
{
251
}
252
253
254
255
Uint8
SDL_GetMouseState(int *x, int *y)
{
256
SDL_Mouse *mouse = SDL_GetMouse();
257
258
259
260
261
262
if (x) {
*x = mouse->x;
}
if (y) {
*y = mouse->y;
263
}
264
265
266
267
268
269
return mouse->buttonstate;
}
Uint8
SDL_GetRelativeMouseState(int *x, int *y)
{
270
SDL_Mouse *mouse = SDL_GetMouse();
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
if (x) {
*x = mouse->xdelta;
}
if (y) {
*y = mouse->ydelta;
}
mouse->xdelta = 0;
mouse->ydelta = 0;
return mouse->buttonstate;
}
void
SDL_WarpMouseInWindow(SDL_Window * window, int x, int y)
{
286
SDL_Mouse *mouse = SDL_GetMouse();
287
288
if (mouse->WarpMouse) {
289
mouse->WarpMouse(window, x, y);
290
} else {
291
SDL_SendMouseMotion(window, 0, x, y);
292
293
294
295
296
297
}
}
int
SDL_SetRelativeMouseMode(SDL_bool enabled)
{
298
SDL_Mouse *mouse = SDL_GetMouse();
299
300
301
302
303
304
305
306
307
308
/* Flush pending mouse motion */
SDL_FlushEvent(SDL_MOUSEMOTION);
/* Set the relative mode */
mouse->relative_mode = enabled;
if (!enabled) {
/* Restore the expected mouse position */
SDL_WarpMouseInWindow(mouse->focus, mouse->x, mouse->y);
309
}
310
311
312
313
314
315
316
317
318
319
/* Update cursor visibility */
SDL_SetCursor(NULL);
return 0;
}
SDL_bool
SDL_GetRelativeMouseMode()
{
320
SDL_Mouse *mouse = SDL_GetMouse();
321
322
return mouse->relative_mode;
323
324
325
326
327
328
}
SDL_Cursor *
SDL_CreateCursor(const Uint8 * data, const Uint8 * mask,
int w, int h, int hot_x, int hot_y)
{
329
SDL_Mouse *mouse = SDL_GetMouse();
330
331
332
333
SDL_Surface *surface;
SDL_Cursor *cursor;
int x, y;
Uint32 *pixel;
334
Uint8 datab = 0, maskb = 0;
335
336
337
338
339
const Uint32 black = 0xFF000000;
const Uint32 white = 0xFFFFFFFF;
const Uint32 transparent = 0x00000000;
if (!mouse->CreateCursor) {
340
SDL_SetError("Cursors are not currently supported");
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
return NULL;
}
/* Sanity check the hot spot */
if ((hot_x < 0) || (hot_y < 0) || (hot_x >= w) || (hot_y >= h)) {
SDL_SetError("Cursor hot spot doesn't lie within cursor");
return NULL;
}
/* Make sure the width is a multiple of 8 */
w = ((w + 7) & ~7);
/* Create the surface from a bitmap */
surface =
SDL_CreateRGBSurface(0, w, h, 32, 0x00FF0000, 0x0000FF00, 0x000000FF,
0xFF000000);
if (!surface) {
return NULL;
}
for (y = 0; y < h; ++y) {
pixel = (Uint32 *) ((Uint8 *) surface->pixels + y * surface->pitch);
for (x = 0; x < w; ++x) {
if ((x % 8) == 0) {
datab = *data++;
maskb = *mask++;
}
if (maskb & 0x80) {
*pixel++ = (datab & 0x80) ? black : white;
} else {
*pixel++ = (datab & 0x80) ? black : transparent;
}
datab <<= 1;
maskb <<= 1;
}
}
cursor = mouse->CreateCursor(surface, hot_x, hot_y);
if (cursor) {
cursor->next = mouse->cursors;
mouse->cursors = cursor;
}
SDL_FreeSurface(surface);
return cursor;
}
/* SDL_SetCursor(NULL) can be used to force the cursor redraw,
if this is desired for any reason. This is used when setting
the video mode and when the SDL window gains the mouse focus.
*/
void
SDL_SetCursor(SDL_Cursor * cursor)
{
395
SDL_Mouse *mouse = SDL_GetMouse();
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
/* Set the new cursor */
if (cursor) {
/* Make sure the cursor is still valid for this mouse */
SDL_Cursor *found;
for (found = mouse->cursors; found; found = found->next) {
if (found == cursor) {
break;
}
}
if (!found) {
SDL_SetError("Cursor not associated with the current mouse");
return;
}
mouse->cur_cursor = cursor;
} else {
cursor = mouse->cur_cursor;
}
if (cursor && mouse->cursor_shown && !mouse->relative_mode) {
if (mouse->ShowCursor) {
mouse->ShowCursor(cursor);
}
} else {
if (mouse->ShowCursor) {
mouse->ShowCursor(NULL);
}
}
}
SDL_Cursor *
SDL_GetCursor(void)
{
429
SDL_Mouse *mouse = SDL_GetMouse();
430
431
432
433
434
435
436
437
438
439
if (!mouse) {
return NULL;
}
return mouse->cur_cursor;
}
void
SDL_FreeCursor(SDL_Cursor * cursor)
{
440
SDL_Mouse *mouse = SDL_GetMouse();
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
SDL_Cursor *curr, *prev;
if (!cursor) {
return;
}
if (cursor == mouse->def_cursor) {
return;
}
if (cursor == mouse->cur_cursor) {
SDL_SetCursor(mouse->def_cursor);
}
for (prev = NULL, curr = mouse->cursors; curr;
prev = curr, curr = curr->next) {
if (curr == cursor) {
if (prev) {
prev->next = curr->next;
} else {
mouse->cursors = curr->next;
}
if (mouse->FreeCursor) {
mouse->FreeCursor(curr);
}
return;
}
}
469
470
}
471
472
int
SDL_ShowCursor(int toggle)
473
{
474
SDL_Mouse *mouse = SDL_GetMouse();
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
SDL_bool shown;
if (!mouse) {
return 0;
}
shown = mouse->cursor_shown;
if (toggle >= 0) {
if (toggle) {
mouse->cursor_shown = SDL_TRUE;
} else {
mouse->cursor_shown = SDL_FALSE;
}
if (mouse->cursor_shown != shown) {
SDL_SetCursor(NULL);
}
}
return shown;
493
494
}
495
/* vi: set ts=4 sw=4 expandtab: */