This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
/
SDL_mouse.c
497 lines (422 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
return (0);
41
42
}
43
44
45
46
47
48
SDL_Mouse *
SDL_GetMouse(void)
{
return &SDL_mouse;
}
49
50
void
SDL_ResetMouse(void)
51
{
52
/* FIXME */
53
}
54
55
SDL_Window *
56
SDL_GetMouseFocus(void)
57
{
58
SDL_Mouse *mouse = SDL_GetMouse();
59
60
return mouse->focus;
61
62
}
63
void
64
SDL_SetMouseFocus(SDL_Window * window)
65
{
66
SDL_Mouse *mouse = SDL_GetMouse();
67
68
if (mouse->focus == window) {
69
70
71
72
73
return;
}
/* See if the current window has lost focus */
if (mouse->focus) {
74
SDL_SendWindowEvent(mouse->focus, SDL_WINDOWEVENT_LEAVE, 0, 0);
75
76
}
77
mouse->focus = window;
78
79
if (mouse->focus) {
80
SDL_SendWindowEvent(mouse->focus, SDL_WINDOWEVENT_ENTER, 0, 0);
81
82
83
84
}
}
int
85
SDL_SendMouseMotion(SDL_Window * window, int relative, int x, int y)
86
{
87
SDL_Mouse *mouse = SDL_GetMouse();
88
89
90
int posted;
int xrel;
int yrel;
91
int x_max = 0, y_max = 0;
92
93
94
95
96
if (window) {
SDL_SetMouseFocus(window);
}
97
/* the relative motion is calculated regarding the system cursor last position */
98
99
100
if (relative) {
xrel = x;
yrel = y;
101
102
x = (mouse->last_x + x);
y = (mouse->last_y + y);
103
} else {
104
105
xrel = x - mouse->last_x;
yrel = y - mouse->last_y;
106
}
107
108
109
/* Drop events that don't change state */
if (!xrel && !yrel) {
110
#if 0
111
printf("Mouse event didn't change state - dropped!\n");
112
#endif
113
114
115
return 0;
}
116
117
/* Update internal mouse coordinates */
if (mouse->relative_mode == SDL_FALSE) {
118
119
mouse->x = x;
mouse->y = y;
120
} else {
121
122
123
mouse->x += xrel;
mouse->y += yrel;
}
124
125
SDL_GetWindowSize(mouse->focus, &x_max, &y_max);
126
127
--x_max;
--y_max;
128
129
130
/* make sure that the pointers find themselves inside the windows */
/* only check if mouse->xmax is set ! */
131
if (mouse->x > x_max) {
132
mouse->x = x_max;
133
134
}
if (mouse->x < 0) {
135
136
137
mouse->x = 0;
}
138
if (mouse->y > y_max) {
139
mouse->y = y_max;
140
141
}
if (mouse->y < 0) {
142
mouse->y = 0;
143
}
144
145
146
147
mouse->xdelta += xrel;
mouse->ydelta += yrel;
148
#if 0 /* FIXME */
149
150
151
152
153
/* Move the mouse cursor, if needed */
if (mouse->cursor_shown && !mouse->relative_mode &&
mouse->MoveCursor && mouse->cur_cursor) {
mouse->MoveCursor(mouse->cur_cursor);
}
154
#endif
155
156
157
/* Post the event, if desired */
posted = 0;
158
if (SDL_GetEventState(SDL_MOUSEMOTION) == SDL_ENABLE) {
159
160
SDL_Event event;
event.motion.type = SDL_MOUSEMOTION;
161
event.motion.windowID = mouse->focus ? mouse->focus->id : 0;
162
163
164
event.motion.state = mouse->buttonstate;
event.motion.x = mouse->x;
event.motion.y = mouse->y;
165
166
event.motion.xrel = xrel;
event.motion.yrel = yrel;
167
168
posted = (SDL_PushEvent(&event) > 0);
}
169
170
mouse->last_x = mouse->x;
mouse->last_y = mouse->y;
171
172
173
174
return posted;
}
int
175
SDL_SendMouseButton(SDL_Window * window, Uint8 state, Uint8 button)
176
{
177
SDL_Mouse *mouse = SDL_GetMouse();
178
int posted;
179
Uint32 type;
180
181
182
183
184
if (window) {
SDL_SetMouseFocus(window);
}
185
186
187
188
189
190
191
192
193
194
195
/* 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:
196
if (!(mouse->buttonstate & SDL_BUTTON(button))) {
197
198
199
/* Ignore this event, no state change */
return 0;
}
200
201
202
203
204
205
206
207
208
209
type = SDL_MOUSEBUTTONUP;
mouse->buttonstate &= ~SDL_BUTTON(button);
break;
default:
/* Invalid state -- bail */
return 0;
}
/* Post the event, if desired */
posted = 0;
210
if (SDL_GetEventState(type) == SDL_ENABLE) {
211
212
213
214
215
216
SDL_Event event;
event.type = type;
event.button.state = state;
event.button.button = button;
event.button.x = mouse->x;
event.button.y = mouse->y;
217
event.button.windowID = mouse->focus ? mouse->focus->id : 0;
218
219
220
221
222
223
posted = (SDL_PushEvent(&event) > 0);
}
return posted;
}
int
224
SDL_SendMouseWheel(SDL_Window * window, int x, int y)
225
{
226
SDL_Mouse *mouse = SDL_GetMouse();
227
228
int posted;
229
230
231
232
if (window) {
SDL_SetMouseFocus(window);
}
233
if (!x && !y) {
234
235
236
237
238
return 0;
}
/* Post the event, if desired */
posted = 0;
239
if (SDL_GetEventState(SDL_MOUSEWHEEL) == SDL_ENABLE) {
240
241
SDL_Event event;
event.type = SDL_MOUSEWHEEL;
242
event.wheel.windowID = mouse->focus ? mouse->focus->id : 0;
243
244
event.wheel.x = x;
event.wheel.y = y;
245
246
247
248
249
250
posted = (SDL_PushEvent(&event) > 0);
}
return posted;
}
void
251
SDL_MouseQuit(void)
252
{
253
}
254
255
256
257
Uint8
SDL_GetMouseState(int *x, int *y)
{
258
SDL_Mouse *mouse = SDL_GetMouse();
259
260
261
262
263
264
if (x) {
*x = mouse->x;
}
if (y) {
*y = mouse->y;
265
}
266
267
268
269
270
271
return mouse->buttonstate;
}
Uint8
SDL_GetRelativeMouseState(int *x, int *y)
{
272
SDL_Mouse *mouse = SDL_GetMouse();
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
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)
{
288
SDL_Mouse *mouse = SDL_GetMouse();
289
290
if (mouse->WarpMouse) {
291
mouse->WarpMouse(window, x, y);
292
} else {
293
SDL_SendMouseMotion(window, 0, x, y);
294
295
296
297
298
299
}
}
int
SDL_SetRelativeMouseMode(SDL_bool enabled)
{
300
SDL_Mouse *mouse = SDL_GetMouse();
301
302
303
304
305
306
307
308
309
310
/* 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);
311
}
312
313
314
315
316
317
318
319
320
321
/* Update cursor visibility */
SDL_SetCursor(NULL);
return 0;
}
SDL_bool
SDL_GetRelativeMouseMode()
{
322
SDL_Mouse *mouse = SDL_GetMouse();
323
324
return mouse->relative_mode;
325
326
327
328
329
330
}
SDL_Cursor *
SDL_CreateCursor(const Uint8 * data, const Uint8 * mask,
int w, int h, int hot_x, int hot_y)
{
331
SDL_Mouse *mouse = SDL_GetMouse();
332
333
334
335
SDL_Surface *surface;
SDL_Cursor *cursor;
int x, y;
Uint32 *pixel;
336
Uint8 datab = 0, maskb = 0;
337
338
339
340
341
const Uint32 black = 0xFF000000;
const Uint32 white = 0xFFFFFFFF;
const Uint32 transparent = 0x00000000;
if (!mouse->CreateCursor) {
342
SDL_SetError("Cursors are not currently supported");
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
395
396
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)
{
397
SDL_Mouse *mouse = SDL_GetMouse();
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
429
430
/* 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)
{
431
SDL_Mouse *mouse = SDL_GetMouse();
432
433
434
435
436
437
438
439
440
441
if (!mouse) {
return NULL;
}
return mouse->cur_cursor;
}
void
SDL_FreeCursor(SDL_Cursor * cursor)
{
442
SDL_Mouse *mouse = SDL_GetMouse();
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
469
470
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;
}
}
471
472
}
473
474
int
SDL_ShowCursor(int toggle)
475
{
476
SDL_Mouse *mouse = SDL_GetMouse();
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
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;
495
496
}
497
/* vi: set ts=4 sw=4 expandtab: */