/* $Xorg: grabs.c,v 1.4 2001/02/09 02:04:40 xorgcvs Exp $ */ /* Copyright 1987, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts, All Rights Reserved Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Digital not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN action OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include "X.h" #include "misc.h" #define NEED_EVENTS #include "Xproto.h" #include "windowstr.h" #include "inputstr.h" #include "cursorstr.h" extern InputInfo inputInfo; #define BITMASK(i) (((Mask)1) << ((i) & 31)) #define MASKIDX(i) ((i) >> 5) #define MASKWORD(buf, i) buf[MASKIDX(i)] #define BITSET(buf, i) MASKWORD(buf, i) |= BITMASK(i) #define BITCLEAR(buf, i) MASKWORD(buf, i) &= ~BITMASK(i) #define GETBIT(buf, i) (MASKWORD(buf, i) & BITMASK(i)) GrabPtr CreateGrab(client, device, window, eventMask, ownerEvents, keyboardMode, pointerMode, modDevice, modifiers, type, keybut, confineTo, cursor) int client; DeviceIntPtr device; WindowPtr window; Mask eventMask; Bool ownerEvents, keyboardMode, pointerMode; DeviceIntPtr modDevice; unsigned short modifiers; int type; KeyCode keybut; /* key or button */ WindowPtr confineTo; CursorPtr cursor; { GrabPtr grab; grab = (GrabPtr)xalloc(sizeof(GrabRec)); if (!grab) return (GrabPtr)NULL; grab->resource = FakeClientID(client); grab->device = device; grab->coreGrab = ((device == inputInfo.keyboard) || (device == inputInfo.pointer)); grab->window = window; grab->eventMask = eventMask; grab->ownerEvents = ownerEvents; grab->keyboardMode = keyboardMode; grab->pointerMode = pointerMode; grab->modifiersDetail.exact = modifiers; grab->modifiersDetail.pMask = NULL; grab->modifierDevice = modDevice; grab->coreMods = ((modDevice == inputInfo.keyboard) || (modDevice == inputInfo.pointer)); grab->type = type; grab->detail.exact = keybut; grab->detail.pMask = NULL; grab->confineTo = confineTo; grab->cursor = cursor; if (cursor) cursor->refcnt++; return grab; } static void FreeGrab(pGrab) GrabPtr pGrab; { if (pGrab->modifiersDetail.pMask != NULL) xfree(pGrab->modifiersDetail.pMask); if (pGrab->detail.pMask != NULL) xfree(pGrab->detail.pMask); if (pGrab->cursor) FreeCursor(pGrab->cursor, (Cursor)0); xfree(pGrab); } /*ARGSUSED*/ int DeletePassiveGrab(value, id) pointer value; XID id; { register GrabPtr g, prev; GrabPtr pGrab = (GrabPtr)value; /* it is OK if the grab isn't found */ prev = 0; for (g = (wPassiveGrabs (pGrab->window)); g; g = g->next) { if (pGrab == g) { if (prev) prev->next = g->next; else if (!(pGrab->window->optional->passiveGrabs = g->next)) CheckWindowOptionalNeed (pGrab->window); break; } prev = g; } FreeGrab(pGrab); return Success; } static Mask * DeleteDetailFromMask(pDetailMask, detail) Mask *pDetailMask; unsigned short detail; { register Mask *mask; register int i; mask = (Mask *)xalloc(sizeof(Mask) * MasksPerDetailMask); if (mask) { if (pDetailMask) for (i = 0; i < MasksPerDetailMask; i++) mask[i]= pDetailMask[i]; else for (i = 0; i < MasksPerDetailMask; i++) mask[i]= ~0L; BITCLEAR(mask, detail); } return mask; } static Bool IsInGrabMask(firstDetail, secondDetail, exception) DetailRec firstDetail, secondDetail; unsigned short exception; { if (firstDetail.exact == exception) { if (firstDetail.pMask == NULL) return TRUE; /* (at present) never called with two non-null pMasks */ if (secondDetail.exact == exception) return FALSE; if (GETBIT(firstDetail.pMask, secondDetail.exact)) return TRUE; } return FALSE; } static Bool IdenticalExactDetails(firstExact, secondExact, exception) unsigned short firstExact, secondExact, exception; { if ((firstExact == exception) || (secondExact == exception)) return FALSE; if (firstExact == secondExact) return TRUE; return FALSE; } static Bool DetailSupersedesSecond(firstDetail, secondDetail, exception) DetailRec firstDetail, secondDetail; unsigned short exception; { if (IsInGrabMask(firstDetail, secondDetail, exception)) return TRUE; if (IdenticalExactDetails(firstDetail.exact, secondDetail.exact, exception)) return TRUE; return FALSE; } static Bool GrabSupersedesSecond(pFirstGrab, pSecondGrab) GrabPtr pFirstGrab, pSecondGrab; { if (!DetailSupersedesSecond(pFirstGrab->modifiersDetail, pSecondGrab->modifiersDetail, (unsigned short)AnyModifier)) return FALSE; if (DetailSupersedesSecond(pFirstGrab->detail, pSecondGrab->detail, (unsigned short)AnyKey)) return TRUE; return FALSE; } Bool GrabMatchesSecond(pFirstGrab, pSecondGrab) GrabPtr pFirstGrab, pSecondGrab; { if ((pFirstGrab->device != pSecondGrab->device) || (pFirstGrab->modifierDevice != pSecondGrab->modifierDevice) || (pFirstGrab->type != pSecondGrab->type)) return FALSE; if (GrabSupersedesSecond(pFirstGrab, pSecondGrab) || GrabSupersedesSecond(pSecondGrab, pFirstGrab)) return TRUE; if (DetailSupersedesSecond(pSecondGrab->detail, pFirstGrab->detail, (unsigned short)AnyKey) && DetailSupersedesSecond(pFirstGrab->modifiersDetail, pSecondGrab->modifiersDetail, (unsigned short)AnyModifier)) return TRUE; if (DetailSupersedesSecond(pFirstGrab->detail, pSecondGrab->detail, (unsigned short)AnyKey) && DetailSupersedesSecond(pSecondGrab->modifiersDetail, pFirstGrab->modifiersDetail, (unsigned short)AnyModifier)) return TRUE; return FALSE; } int AddPassiveGrabToList(pGrab) GrabPtr pGrab; { GrabPtr grab; for (grab = wPassiveGrabs(pGrab->window); grab; grab = grab->next) { if (GrabMatchesSecond(pGrab, grab)) { if (CLIENT_BITS(pGrab->resource) != CLIENT_BITS(grab->resource)) { FreeGrab(pGrab); return BadAccess; } } } if (!pGrab->window->optional && !MakeWindowOptional (pGrab->window)) { FreeGrab(pGrab); return BadAlloc; } pGrab->next = pGrab->window->optional->passiveGrabs; pGrab->window->optional->passiveGrabs = pGrab; if (AddResource(pGrab->resource, RT_PASSIVEGRAB, (pointer)pGrab)) return Success; return BadAlloc; } /* the following is kinda complicated, because we need to be able to back out * if any allocation fails */ Bool DeletePassiveGrabFromList(pMinuendGrab) GrabPtr pMinuendGrab; { register GrabPtr grab; GrabPtr *deletes, *adds; Mask ***updates, **details; int i, ndels, nadds, nups; Bool ok; #define UPDATE(mask,exact) \ if (!(details[nups] = DeleteDetailFromMask(mask, exact))) \ ok = FALSE; \ else \ updates[nups++] = &(mask) i = 0; for (grab = wPassiveGrabs(pMinuendGrab->window); grab; grab = grab->next) i++; if (!i) return TRUE; deletes = (GrabPtr *)ALLOCATE_LOCAL(i * sizeof(GrabPtr)); adds = (GrabPtr *)ALLOCATE_LOCAL(i * sizeof(GrabPtr)); updates = (Mask ***)ALLOCATE_LOCAL(i * sizeof(Mask **)); details = (Mask **)ALLOCATE_LOCAL(i * sizeof(Mask *)); if (!deletes || !adds || !updates || !details) { if (details) DEALLOCATE_LOCAL(details); if (updates) DEALLOCATE_LOCAL(updates); if (adds) DEALLOCATE_LOCAL(adds); if (deletes) DEALLOCATE_LOCAL(deletes); return FALSE; } ndels = nadds = nups = 0; ok = TRUE; for (grab = wPassiveGrabs(pMinuendGrab->window); grab && ok; grab = grab->next) { if ((CLIENT_BITS(grab->resource) != CLIENT_BITS(pMinuendGrab->resource)) || !GrabMatchesSecond(grab, pMinuendGrab)) continue; if (GrabSupersedesSecond(pMinuendGrab, grab)) { deletes[ndels++] = grab; } else if ((grab->detail.exact == AnyKey) && (grab->modifiersDetail.exact != AnyModifier)) { UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact); } else if ((grab->modifiersDetail.exact == AnyModifier) && (grab->detail.exact != AnyKey)) { UPDATE(grab->modifiersDetail.pMask, pMinuendGrab->modifiersDetail.exact); } else if ((pMinuendGrab->detail.exact != AnyKey) && (pMinuendGrab->modifiersDetail.exact != AnyModifier)) { GrabPtr pNewGrab; UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact); pNewGrab = CreateGrab(CLIENT_ID(grab->resource), grab->device, grab->window, (Mask)grab->eventMask, (Bool)grab->ownerEvents, (Bool)grab->keyboardMode, (Bool)grab->pointerMode, grab->modifierDevice, AnyModifier, (int)grab->type, pMinuendGrab->detail.exact, grab->confineTo, grab->cursor); if (!pNewGrab) ok = FALSE; else if (!(pNewGrab->modifiersDetail.pMask = DeleteDetailFromMask(grab->modifiersDetail.pMask, pMinuendGrab->modifiersDetail.exact)) || (!pNewGrab->window->optional && !MakeWindowOptional(pNewGrab->window))) { FreeGrab(pNewGrab); ok = FALSE; } else if (!AddResource(pNewGrab->resource, RT_PASSIVEGRAB, (pointer)pNewGrab)) ok = FALSE; else adds[nadds++] = pNewGrab; } else if (pMinuendGrab->detail.exact == AnyKey) { UPDATE(grab->modifiersDetail.pMask, pMinuendGrab->modifiersDetail.exact); } else { UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact); } } if (!ok) { for (i = 0; i < nadds; i++) FreeResource(adds[i]->resource, RT_NONE); for (i = 0; i < nups; i++) xfree(details[i]); } else { for (i = 0; i < ndels; i++) FreeResource(deletes[i]->resource, RT_NONE); for (i = 0; i < nadds; i++) { grab = adds[i]; grab->next = grab->window->optional->passiveGrabs; grab->window->optional->passiveGrabs = grab; } for (i = 0; i < nups; i++) { xfree(*updates[i]); *updates[i] = details[i]; } } DEALLOCATE_LOCAL(details); DEALLOCATE_LOCAL(updates); DEALLOCATE_LOCAL(adds); DEALLOCATE_LOCAL(deletes); return ok; #undef UPDATE }