502 lines
13 KiB
C
502 lines
13 KiB
C
/*
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Copyright 1987, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall
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not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization
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from The Open Group.
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Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the name of Digital not be
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used in advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN action OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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*/
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#ifdef HAVE_DIX_CONFIG_H
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#include <dix-config.h>
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#endif
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#include <X11/X.h>
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#include "misc.h"
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#define NEED_EVENTS
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#include <X11/Xproto.h>
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#include "windowstr.h"
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#include "inputstr.h"
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#include "cursorstr.h"
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#include "dixgrabs.h"
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#define BITMASK(i) (((Mask)1) << ((i) & 31))
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#define MASKIDX(i) ((i) >> 5)
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#define MASKWORD(buf, i) buf[MASKIDX(i)]
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#define BITSET(buf, i) MASKWORD(buf, i) |= BITMASK(i)
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#define BITCLEAR(buf, i) MASKWORD(buf, i) &= ~BITMASK(i)
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#define GETBIT(buf, i) (MASKWORD(buf, i) & BITMASK(i))
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GrabPtr
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CreateGrab(
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int client,
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DeviceIntPtr device,
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WindowPtr window,
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Mask eventMask,
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Bool ownerEvents, Bool keyboardMode, Bool pointerMode,
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DeviceIntPtr modDevice,
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unsigned short modifiers,
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int type,
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KeyCode keybut, /* key or button */
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WindowPtr confineTo,
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CursorPtr cursor)
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{
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GrabPtr grab;
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grab = (GrabPtr)xalloc(sizeof(GrabRec));
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if (!grab)
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return (GrabPtr)NULL;
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grab->resource = FakeClientID(client);
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grab->device = device;
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grab->coreGrab = (type < LASTEvent);
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grab->window = window;
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grab->eventMask = eventMask;
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grab->deviceMask = 0;
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grab->ownerEvents = ownerEvents;
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grab->keyboardMode = keyboardMode;
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grab->pointerMode = pointerMode;
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grab->modifiersDetail.exact = modifiers;
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grab->modifiersDetail.pMask = NULL;
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grab->modifierDevice = modDevice;
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grab->coreMods = ((modDevice == inputInfo.keyboard) ||
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(modDevice == inputInfo.pointer));
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grab->type = type;
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grab->detail.exact = keybut;
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grab->detail.pMask = NULL;
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grab->confineTo = confineTo;
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grab->cursor = cursor;
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grab->genericMasks = NULL;
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grab->next = NULL;
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if (cursor)
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cursor->refcnt++;
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return grab;
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}
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static void
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FreeGrab(GrabPtr pGrab)
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{
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if (pGrab->modifiersDetail.pMask != NULL)
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xfree(pGrab->modifiersDetail.pMask);
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if (pGrab->detail.pMask != NULL)
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xfree(pGrab->detail.pMask);
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if (pGrab->cursor)
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FreeCursor(pGrab->cursor, (Cursor)0);
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xfree(pGrab);
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}
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int
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DeletePassiveGrab(pointer value, XID id)
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{
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GrabPtr g, prev;
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GrabPtr pGrab = (GrabPtr)value;
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/* it is OK if the grab isn't found */
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prev = 0;
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for (g = (wPassiveGrabs (pGrab->window)); g; g = g->next)
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{
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if (pGrab == g)
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{
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if (prev)
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prev->next = g->next;
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else
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if (!(pGrab->window->optional->passiveGrabs = g->next))
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CheckWindowOptionalNeed (pGrab->window);
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break;
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}
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prev = g;
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}
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FreeGrab(pGrab);
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return Success;
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}
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static Mask *
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DeleteDetailFromMask(Mask *pDetailMask, unsigned short detail)
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{
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Mask *mask;
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int i;
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mask = (Mask *)xalloc(sizeof(Mask) * MasksPerDetailMask);
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if (mask)
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{
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if (pDetailMask)
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for (i = 0; i < MasksPerDetailMask; i++)
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mask[i]= pDetailMask[i];
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else
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for (i = 0; i < MasksPerDetailMask; i++)
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mask[i]= ~0L;
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BITCLEAR(mask, detail);
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}
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return mask;
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}
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static Bool
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IsInGrabMask(
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DetailRec firstDetail,
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DetailRec secondDetail,
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unsigned short exception)
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{
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if (firstDetail.exact == exception)
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{
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if (firstDetail.pMask == NULL)
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return TRUE;
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/* (at present) never called with two non-null pMasks */
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if (secondDetail.exact == exception)
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return FALSE;
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if (GETBIT(firstDetail.pMask, secondDetail.exact))
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return TRUE;
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}
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return FALSE;
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}
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static Bool
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IdenticalExactDetails(
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unsigned short firstExact,
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unsigned short secondExact,
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unsigned short exception)
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{
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if ((firstExact == exception) || (secondExact == exception))
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return FALSE;
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if (firstExact == secondExact)
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return TRUE;
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return FALSE;
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}
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static Bool
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DetailSupersedesSecond(
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DetailRec firstDetail,
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DetailRec secondDetail,
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unsigned short exception)
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{
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if (IsInGrabMask(firstDetail, secondDetail, exception))
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return TRUE;
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if (IdenticalExactDetails(firstDetail.exact, secondDetail.exact,
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exception))
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return TRUE;
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return FALSE;
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}
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static Bool
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GrabSupersedesSecond(GrabPtr pFirstGrab, GrabPtr pSecondGrab)
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{
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if (!DetailSupersedesSecond(pFirstGrab->modifiersDetail,
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pSecondGrab->modifiersDetail,
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(unsigned short)AnyModifier))
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return FALSE;
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if (DetailSupersedesSecond(pFirstGrab->detail,
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pSecondGrab->detail, (unsigned short)AnyKey))
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return TRUE;
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return FALSE;
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}
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/**
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* Compares two grabs and returns TRUE if the first grab matches the second
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* grab.
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*
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* A match is when
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* - the devices set for the grab are equal (this is optional).
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* - the event types for both grabs are equal.
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* - XXX
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*
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* @param ignoreDevice TRUE if the device settings on the grabs are to be
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* ignored.
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* @return TRUE if the grabs match or FALSE otherwise.
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*/
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Bool
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GrabMatchesSecond(GrabPtr pFirstGrab, GrabPtr pSecondGrab, Bool ignoreDevice)
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{
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if (!ignoreDevice &&
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((pFirstGrab->device != pSecondGrab->device) ||
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(pFirstGrab->modifierDevice != pSecondGrab->modifierDevice)))
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return FALSE;
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if (pFirstGrab->type != pSecondGrab->type)
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return FALSE;
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if (GrabSupersedesSecond(pFirstGrab, pSecondGrab) ||
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GrabSupersedesSecond(pSecondGrab, pFirstGrab))
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return TRUE;
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if (DetailSupersedesSecond(pSecondGrab->detail, pFirstGrab->detail,
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(unsigned short)AnyKey)
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&&
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DetailSupersedesSecond(pFirstGrab->modifiersDetail,
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pSecondGrab->modifiersDetail,
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(unsigned short)AnyModifier))
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return TRUE;
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if (DetailSupersedesSecond(pFirstGrab->detail, pSecondGrab->detail,
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(unsigned short)AnyKey)
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&&
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DetailSupersedesSecond(pSecondGrab->modifiersDetail,
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pFirstGrab->modifiersDetail,
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(unsigned short)AnyModifier))
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return TRUE;
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return FALSE;
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}
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static Bool
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GrabsAreIdentical(GrabPtr pFirstGrab, GrabPtr pSecondGrab)
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{
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if (pFirstGrab->device != pSecondGrab->device ||
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(pFirstGrab->modifierDevice != pSecondGrab->modifierDevice) ||
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(pFirstGrab->type != pSecondGrab->type))
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return FALSE;
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if (!(DetailSupersedesSecond(pFirstGrab->detail,
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pSecondGrab->detail,
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(unsigned short)AnyKey) &&
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DetailSupersedesSecond(pSecondGrab->detail,
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pFirstGrab->detail,
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(unsigned short)AnyKey)))
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return FALSE;
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if (!(DetailSupersedesSecond(pFirstGrab->modifiersDetail,
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pSecondGrab->modifiersDetail,
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(unsigned short)AnyModifier) &&
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DetailSupersedesSecond(pSecondGrab->modifiersDetail,
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pFirstGrab->modifiersDetail,
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(unsigned short)AnyModifier)))
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return FALSE;
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return TRUE;
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}
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/**
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* Prepend the new grab to the list of passive grabs on the window.
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* Any previously existing grab that matches the new grab will be removed.
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* Adding a new grab that would override another client's grab will result in
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* a BadAccess.
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*
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* @return Success or X error code on failure.
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*/
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int
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AddPassiveGrabToList(GrabPtr pGrab)
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{
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GrabPtr grab;
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for (grab = wPassiveGrabs(pGrab->window); grab; grab = grab->next)
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{
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if (GrabMatchesSecond(pGrab, grab, FALSE))
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{
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if (CLIENT_BITS(pGrab->resource) != CLIENT_BITS(grab->resource))
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{
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FreeGrab(pGrab);
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return BadAccess;
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}
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}
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}
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/* Remove all grabs that match the new one exactly */
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for (grab = wPassiveGrabs(pGrab->window); grab; grab = grab->next)
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{
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if (GrabsAreIdentical(pGrab, grab))
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{
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DeletePassiveGrabFromList(grab);
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break;
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}
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}
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if (!pGrab->window->optional && !MakeWindowOptional (pGrab->window))
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{
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FreeGrab(pGrab);
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return BadAlloc;
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}
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pGrab->next = pGrab->window->optional->passiveGrabs;
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pGrab->window->optional->passiveGrabs = pGrab;
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if (AddResource(pGrab->resource, RT_PASSIVEGRAB, (pointer)pGrab))
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return Success;
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return BadAlloc;
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}
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/* the following is kinda complicated, because we need to be able to back out
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* if any allocation fails
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*/
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Bool
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DeletePassiveGrabFromList(GrabPtr pMinuendGrab)
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{
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GrabPtr grab;
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GrabPtr *deletes, *adds;
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Mask ***updates, **details;
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int i, ndels, nadds, nups;
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Bool ok;
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#define UPDATE(mask,exact) \
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if (!(details[nups] = DeleteDetailFromMask(mask, exact))) \
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ok = FALSE; \
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else \
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updates[nups++] = &(mask)
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i = 0;
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for (grab = wPassiveGrabs(pMinuendGrab->window); grab; grab = grab->next)
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i++;
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if (!i)
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return TRUE;
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deletes = (GrabPtr *)ALLOCATE_LOCAL(i * sizeof(GrabPtr));
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adds = (GrabPtr *)ALLOCATE_LOCAL(i * sizeof(GrabPtr));
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updates = (Mask ***)ALLOCATE_LOCAL(i * sizeof(Mask **));
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details = (Mask **)ALLOCATE_LOCAL(i * sizeof(Mask *));
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if (!deletes || !adds || !updates || !details)
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{
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if (details) DEALLOCATE_LOCAL(details);
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if (updates) DEALLOCATE_LOCAL(updates);
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if (adds) DEALLOCATE_LOCAL(adds);
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if (deletes) DEALLOCATE_LOCAL(deletes);
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return FALSE;
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}
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ndels = nadds = nups = 0;
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ok = TRUE;
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for (grab = wPassiveGrabs(pMinuendGrab->window);
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grab && ok;
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grab = grab->next)
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{
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if ((CLIENT_BITS(grab->resource) != CLIENT_BITS(pMinuendGrab->resource)) ||
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!GrabMatchesSecond(grab, pMinuendGrab, (grab->coreGrab)))
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continue;
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if (GrabSupersedesSecond(pMinuendGrab, grab))
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{
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deletes[ndels++] = grab;
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}
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else if ((grab->detail.exact == AnyKey)
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&& (grab->modifiersDetail.exact != AnyModifier))
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{
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UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact);
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}
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else if ((grab->modifiersDetail.exact == AnyModifier)
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&& (grab->detail.exact != AnyKey))
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{
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UPDATE(grab->modifiersDetail.pMask,
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pMinuendGrab->modifiersDetail.exact);
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}
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else if ((pMinuendGrab->detail.exact != AnyKey)
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&& (pMinuendGrab->modifiersDetail.exact != AnyModifier))
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{
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GrabPtr pNewGrab;
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UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact);
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pNewGrab = CreateGrab(CLIENT_ID(grab->resource), grab->device,
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grab->window, (Mask)grab->eventMask,
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(Bool)grab->ownerEvents,
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(Bool)grab->keyboardMode,
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(Bool)grab->pointerMode,
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grab->modifierDevice,
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AnyModifier, (int)grab->type,
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pMinuendGrab->detail.exact,
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grab->confineTo, grab->cursor);
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if (!pNewGrab)
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ok = FALSE;
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else if (!(pNewGrab->modifiersDetail.pMask =
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DeleteDetailFromMask(grab->modifiersDetail.pMask,
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pMinuendGrab->modifiersDetail.exact))
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||
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(!pNewGrab->window->optional &&
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!MakeWindowOptional(pNewGrab->window)))
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{
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FreeGrab(pNewGrab);
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ok = FALSE;
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}
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else if (!AddResource(pNewGrab->resource, RT_PASSIVEGRAB,
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(pointer)pNewGrab))
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ok = FALSE;
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else
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adds[nadds++] = pNewGrab;
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}
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else if (pMinuendGrab->detail.exact == AnyKey)
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{
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UPDATE(grab->modifiersDetail.pMask,
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pMinuendGrab->modifiersDetail.exact);
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}
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else
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{
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UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact);
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}
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}
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if (!ok)
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{
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for (i = 0; i < nadds; i++)
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FreeResource(adds[i]->resource, RT_NONE);
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for (i = 0; i < nups; i++)
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xfree(details[i]);
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}
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else
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{
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for (i = 0; i < ndels; i++)
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FreeResource(deletes[i]->resource, RT_NONE);
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for (i = 0; i < nadds; i++)
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{
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grab = adds[i];
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grab->next = grab->window->optional->passiveGrabs;
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grab->window->optional->passiveGrabs = grab;
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}
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for (i = 0; i < nups; i++)
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{
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xfree(*updates[i]);
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*updates[i] = details[i];
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}
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}
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DEALLOCATE_LOCAL(details);
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DEALLOCATE_LOCAL(updates);
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DEALLOCATE_LOCAL(adds);
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DEALLOCATE_LOCAL(deletes);
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return ok;
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#undef UPDATE
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}
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