Xlib â C Language X Interface

More documents

Recommendations

Info

<strong>Xlib</strong> − C LibraryX11, Release 6.7 DRAFTthe keyboard, pointer, orselection. By providing the timestamp from the event in the request, youcan arrange that the operation not take effect if someone else has performed an operation in themeanwhile.Atimestamp is a time value, expressed in milliseconds. It typically is the time since the lastserver reset. Timestamp values wrap around (after about 49.7 days). The server, given its currenttime is represented by timestamp T, always interprets timestamps from clients by treating half ofthe timestamp space as being later in time than T. One timestamp value, named CurrentTime, isnever generated by the server. This value is reserved for use in requests to represent the currentserver time.For many functions in this section, you pass pointer event mask bits. The valid pointer eventmask bits are: ButtonPressMask, ButtonReleaseMask, EnterWindowMask, LeaveWindow-Mask, PointerMotionMask, PointerMotionHintMask, Button1MotionMask, Button2MotionMask,Button3MotionMask, Button4MotionMask, Button5MotionMask, ButtonMotionMask,and KeyMapStateMask. For other functions in this section, you passkeymask bits. The valid keymask bits are: ShiftMask, LockMask, ControlMask, Mod1Mask,Mod2Mask, Mod3Mask, Mod4Mask, and Mod5Mask.To grab the pointer, use XGrabPointer.int XGrabPointer(display, grab_window, owner_events, event_mask, pointer_mode,keyboard_mode, confine_to, cursor, time)Display *display;Window grab_window;Bool owner_events;unsigned int event_mask;int pointer_mode, keyboard_mode;Window confine_to;Cursor cursor;Time time;displaygrab_windowowner_eventsevent_maskpointer_modekeyboard_modeconfine_tocursortimeSpecifies the connection to the X server.Specifies the grab window.Specifies a Boolean value that indicates whether the pointer events are to bereported as usual or reported with respect to the grab window ifselected by theevent mask.Specifies which pointer events are reported to the client. The mask is the bitwiseinclusive OR ofthe valid pointer event mask bits.Specifies further processing of pointer events. You can pass GrabModeSync orGrabModeAsync.Specifies further processing of keyboard events. You can pass GrabModeSyncor GrabModeAsync.Specifies the window toconfine the pointer in or None.Specifies the cursor that is to be displayed during the grab or None.Specifies the time. Youcan pass either a timestamp or CurrentTime.The XGrabPointer function actively grabs control of the pointer and returns GrabSuccess if the249
<strong>Xlib</strong> − C LibraryX11, Release 6.7 DRAFTgrab was successful. Further pointer events are reported only to the grabbing client. XGrab-Pointer overrides any active pointer grab by this client. If owner_events is False, all generatedpointer events are reported with respect to grab_window and are reported only if selected byevent_mask. If owner_events is True and if a generated pointer event would normally bereported to this client, it is reported as usual. Otherwise, the event is reported with respect to thegrab_window and is reported only if selected by event_mask. For either value of owner_events,unreported events are discarded.If the pointer_mode is GrabModeAsync, pointer event processing continues as usual. If thepointer is currently frozen by this client, the processing of events for the pointer is resumed. Ifthe pointer_mode is GrabModeSync, the state of the pointer, asseen by client applications,appears to freeze, and the X server generates no further pointer events until the grabbing clientcalls XAllowEvents or until the pointer grab is released. Actual pointer changes are not lostwhile the pointer is frozen; they are simply queued in the server for later processing.If the keyboard_mode is GrabModeAsync, keyboard event processing is unaffected by activationof the grab. Ifthe keyboard_mode is GrabModeSync, the state of the keyboard, as seenby client applications, appears to freeze, and the X server generates no further keyboard eventsuntil the grabbing client calls XAllowEvents or until the pointer grab is released. Actualkeyboard changes are not lost while the pointer is frozen; they are simply queued in the server forlater processing.If a cursor is specified, it is displayed regardless of what window the pointer is in. If None isspecified, the normal cursor for that window isdisplayed when the pointer is in grab_window orone of its subwindows; otherwise, the cursor for grab_window isdisplayed.If a confine_to window isspecified, the pointer is restricted to stay contained in that window. Theconfine_to window need have no relationship to the grab_window. Ifthe pointer is not initially inthe confine_to window, itiswarped automatically to the closest edge just before the grab activatesand enter/leave events are generated as usual. If the confine_to window issubsequently reconfigured,the pointer is warped automatically, asnecessary, tokeep it contained in the window.The time argument allows you to avoid certain circumstances that come up if applications take along time to respond or if there are long network delays. Consider a situation where you havetwo applications, both of which normally grab the pointer when clicked on. If both applicationsspecify the timestamp from the event, the second application may wake upfaster and successfullygrab the pointer before the first application. The first application then will get an indication thatthe other application grabbed the pointer before its request was processed.XGrabPointer generates EnterNotify and LeaveNotify events.Either if grab_window orconfine_to window isnot viewable or if the confine_to window liescompletely outside the boundaries of the root window, XGrabPointer fails and returns Grab-NotViewable. Ifthe pointer is actively grabbed by some other client, it fails and returnsAlreadyGrabbed. Ifthe pointer is frozen by an active grab of another client, it fails and returnsGrabFrozen. Ifthe specified time is earlier than the last-pointer-grab time or later than the currentX server time, it fails and returns GrabInvalidTime. Otherwise, the last-pointer-grab timeis set to the specified time (CurrentTime is replaced by the current X server time).XGrabPointer can generate BadCursor, BadValue, and BadWindow errors.To ungrab the pointer, use XUngrabPointer.250
Page 3 and 4:
AcknowledgmentsThe design and imple
Page 5 and 6:
Release 6Stephen Gildea (X Consorti
Page 7 and 8:
Xlib − C LibraryX11, Release 6.7
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Page 33 and 34:
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
Page 139 and 140:
Page 141 and 142:
Page 143 and 144:
Page 145 and 146:
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
Page 161 and 162:
Page 163 and 164:
Page 165 and 166:
Page 167 and 168:
Page 169 and 170:
Page 171 and 172:
Page 173 and 174:
Page 175 and 176:
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 203 and 204: Xlib − C LibraryX11, Release 6.7
Page 253: Xlib − C LibraryX11, Release 6.7
Page 305 and 306:
Page 307 and 308:
Page 309 and 310:
Page 311 and 312:
Page 313 and 314:
Page 315 and 316:
Page 317 and 318:
Page 319 and 320:
Page 321 and 322:
Page 323 and 324:
Page 325 and 326:
Page 327 and 328:
Page 329 and 330:
Page 331 and 332:
Page 333 and 334:
Page 335 and 336:
Page 337 and 338:
Page 339 and 340:
Page 341 and 342:
Page 343 and 344:
Page 345 and 346:
Page 347 and 348:
Page 349 and 350:
Page 351 and 352:
Page 353 and 354:
Page 355 and 356:
Page 357 and 358:
Page 359 and 360:
Page 361 and 362:
Page 363 and 364:
Page 365 and 366:
Page 367 and 368:
Page 369 and 370:
Page 371 and 372:
Page 373 and 374:
Page 375 and 376:
Page 377 and 378:
Page 379 and 380:
Page 381 and 382:
Page 383 and 384:
Page 385 and 386:
Page 387 and 388:
Page 389 and 390:
Page 391 and 392:
Page 393 and 394:
Page 395 and 396:
Page 397 and 398:
Page 399 and 400:
Page 401 and 402:
Page 403 and 404:
Page 405 and 406:
Page 407 and 408:
Page 409 and 410:
Page 411 and 412:
Page 413 and 414:
Page 415 and 416:
Page 417 and 418:
Page 419 and 420:
Page 421 and 422:
Page 423 and 424:
Page 425 and 426:
Page 427 and 428:
Page 429 and 430:
Page 431 and 432:
Page 433 and 434:
Page 435 and 436:
Page 437 and 438:
Page 439 and 440:
Page 441 and 442:
Page 443 and 444:
Page 445 and 446:
Page 447 and 448:
Page 449 and 450:
Page 451 and 452:
Page 453 and 454:
Page 455 and 456:
Page 457 and 458:
Page 459 and 460:
Page 461 and 462:
Page 463 and 464:
Page 465 and 466:
Page 467 and 468:
Page 469 and 470:
Page 471 and 472:
Page 473 and 474:
Page 475 and 476:
Page 477 and 478:
Page 479 and 480:
Page 481 and 482:
Page 483 and 484:
Page 485 and 486:
Page 487 and 488:
Page 489 and 490:
Page 491 and 492:
Page 493 and 494:
Page 495 and 496:
4.2. Translating Screen Coordinates
Page 497 and 498:
10.7. Input Focus Events . . . . .
Page 499 and 500:
13.5.6.1. Input Style . . . . . . .
show all

Xlib â C Language X Interface

Create successful ePaper yourself

Delete template?

Save as template?

Xlib â C Language X Interface