events.c

远程桌面连接工具

/************************************************************

Copyright (c) 1987  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

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
X CONSORTIUM 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 X Consortium 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 X Consortium.


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.

********************************************************/


/* $XConsortium: events.c /main/187 1996/09/25 00:47:41 dpw $ */
/* $XFree86: xc/programs/Xserver/dix/events.c,v 3.11 1996/12/24 02:23:45 dawes Exp $ */

#include "X.h"
#include "misc.h"
#include "resource.h"
#define NEED_EVENTS
#define NEED_REPLIES
#include "Xproto.h"
#include "windowstr.h"
#include "inputstr.h"
#include "scrnintstr.h"
#include "cursorstr.h"

#include "dixstruct.h"

#ifdef XKB
#include "XKBsrv.h"
#endif

#ifdef XCSECURITY
#define _SECURITY_SERVER
#include "extensions/security.h"
#endif

#include "XIproto.h"
#include "exevents.h"
#include "extnsionst.h"

#include "dixevents.h"
#include "dixgrabs.h"
#include "dispatch.h"

extern WindowPtr *WindowTable;

#define EXTENSION_EVENT_BASE  64

#define NoSuchEvent 0x80000000	/* so doesn't match NoEventMask */
#define StructureAndSubMask ( StructureNotifyMask | SubstructureNotifyMask )
#define AllButtonsMask ( \
	Button1Mask | Button2Mask | Button3Mask | Button4Mask | Button5Mask )
#define MotionMask ( \
	PointerMotionMask | Button1MotionMask | \
	Button2MotionMask | Button3MotionMask | Button4MotionMask | \
	Button5MotionMask | ButtonMotionMask )
#define PropagateMask ( \
	KeyPressMask | KeyReleaseMask | ButtonPressMask | ButtonReleaseMask | \
	MotionMask )
#define PointerGrabMask ( \
	ButtonPressMask | ButtonReleaseMask | \
	EnterWindowMask | LeaveWindowMask | \
	PointerMotionHintMask | KeymapStateMask | \
	MotionMask )
#define AllModifiersMask ( \
	ShiftMask | LockMask | ControlMask | Mod1Mask | Mod2Mask | \
	Mod3Mask | Mod4Mask | Mod5Mask )
#define AllEventMasks (lastEventMask|(lastEventMask-1))
/*
 * The following relies on the fact that the Button<n>MotionMasks are equal
 * to the corresponding Button<n>Masks from the current modifier/button state.
 */
#define Motion_Filter(class) (PointerMotionMask | \
			      (class)->state | (class)->motionMask)


#define WID(w) ((w) ? ((w)->drawable.id) : 0)

#define rClient(obj) (clients[CLIENT_ID((obj)->resource)])

CallbackListPtr EventCallback;
CallbackListPtr DeviceEventCallback;

#define DNPMCOUNT 8

Mask DontPropagateMasks[DNPMCOUNT];
static int DontPropagateRefCnts[DNPMCOUNT];

#ifdef DEBUG
static debug_events = 0;
#endif
InputInfo inputInfo;

static struct {
    QdEventPtr		pending, *pendtail;
    DeviceIntPtr	replayDev;	/* kludgy rock to put flag for */
    WindowPtr		replayWin;	/*   ComputeFreezes            */
    Bool		playingEvents;
    TimeStamp		time;
} syncEvents;

/*
 * The window trace information is used to avoid having to compute all the
 * windows between the root and the current pointer window each time a button
 * or key goes down. The grabs on each of those windows must be checked.
 */
static WindowPtr *spriteTrace = (WindowPtr *)NULL;
#define ROOT spriteTrace[0]
static int spriteTraceSize = 0;
static int spriteTraceGood;

typedef struct {
    int		x, y;
    ScreenPtr	pScreen;
} HotSpot;

static  struct {
    CursorPtr	current;
    BoxRec	hotLimits;	/* logical constraints of hot spot */
    Bool	confined;	/* confined to screen */
#ifdef SHAPE
    RegionPtr	hotShape;	/* additional logical shape constraint */
#endif
    BoxRec	physLimits;	/* physical constraints of hot spot */
    WindowPtr	win;		/* window of logical position */
    HotSpot	hot;		/* logical pointer position */
    HotSpot	hotPhys;	/* physical pointer position */
} sprite;			/* info about the cursor sprite */

static void DoEnterLeaveEvents(
#if NeedFunctionPrototypes
    WindowPtr /*fromWin*/,
    WindowPtr /*toWin*/,
    int /*mode*/
#endif
);

static WindowPtr XYToWindow(
#if NeedFunctionPrototypes
    int /*x*/,
    int /*y*/
#endif
);

extern Bool permitOldBugs;
extern Bool Must_have_memory;
extern int lastEvent;
#ifdef XINPUT
extern int DeviceMotionNotify, DeviceButtonPress, DeviceKeyPress;
#endif

static Mask lastEventMask;

#define CantBeFiltered NoEventMask
static Mask filters[128] =
{
	NoSuchEvent,		       /* 0 */
	NoSuchEvent,		       /* 1 */
	KeyPressMask,		       /* KeyPress */
	KeyReleaseMask,		       /* KeyRelease */
	ButtonPressMask,	       /* ButtonPress */
	ButtonReleaseMask,	       /* ButtonRelease */
	PointerMotionMask,	       /* MotionNotify (initial state) */
	EnterWindowMask,	       /* EnterNotify */
	LeaveWindowMask,	       /* LeaveNotify */
	FocusChangeMask,	       /* FocusIn */
	FocusChangeMask,	       /* FocusOut */
	KeymapStateMask,	       /* KeymapNotify */
	ExposureMask,		       /* Expose */
	CantBeFiltered,		       /* GraphicsExpose */
	CantBeFiltered,		       /* NoExpose */
	VisibilityChangeMask,	       /* VisibilityNotify */
	SubstructureNotifyMask,	       /* CreateNotify */
	StructureAndSubMask,	       /* DestroyNotify */
	StructureAndSubMask,	       /* UnmapNotify */
	StructureAndSubMask,	       /* MapNotify */
	SubstructureRedirectMask,      /* MapRequest */
	StructureAndSubMask,	       /* ReparentNotify */
	StructureAndSubMask,	       /* ConfigureNotify */
	SubstructureRedirectMask,      /* ConfigureRequest */
	StructureAndSubMask,	       /* GravityNotify */
	ResizeRedirectMask,	       /* ResizeRequest */
	StructureAndSubMask,	       /* CirculateNotify */
	SubstructureRedirectMask,      /* CirculateRequest */
	PropertyChangeMask,	       /* PropertyNotify */
	CantBeFiltered,		       /* SelectionClear */
	CantBeFiltered,		       /* SelectionRequest */
	CantBeFiltered,		       /* SelectionNotify */
	ColormapChangeMask,	       /* ColormapNotify */
	CantBeFiltered,		       /* ClientMessage */
	CantBeFiltered		       /* MappingNotify */
};

static CARD8 criticalEvents[32] =
{
    0x3c				/* key and button events */
};

Mask
GetNextEventMask()
{
    lastEventMask <<= 1;
    return lastEventMask;
}

void
SetMaskForEvent(mask, event)
    Mask mask;
    int event;
{
    if ((event < LASTEvent) || (event >= 128))
	FatalError("SetMaskForEvent: bogus event number");
    filters[event] = mask;
}

void
SetCriticalEvent(event)
    int event;
{
    if (event >= 128)
	FatalError("SetCriticalEvent: bogus event number");
    criticalEvents[event >> 3] |= 1 << (event & 7);
}

static void
#if NeedFunctionPrototypes
SyntheticMotion(int x, int y)
#else
SyntheticMotion(x, y)
    int x, y;
#endif
{
    xEvent xE;

    xE.u.keyButtonPointer.rootX = x;
    xE.u.keyButtonPointer.rootY = y;
    if (syncEvents.playingEvents)
	xE.u.keyButtonPointer.time = syncEvents.time.milliseconds;
    else
	xE.u.keyButtonPointer.time = currentTime.milliseconds;
    xE.u.u.type = MotionNotify;
    (*inputInfo.pointer->public.processInputProc)(&xE, inputInfo.pointer, 1);
}

#ifdef SHAPE
static void
#if NeedFunctionPrototypes
ConfineToShape(RegionPtr shape, int *px, int *py)
#else
ConfineToShape(shape, px, py)
    RegionPtr shape;
    int *px, *py;
#endif
{
    BoxRec box;
    int x = *px, y = *py;
    int incx = 1, incy = 1;

    if (POINT_IN_REGION(sprite.hot.pScreen, shape, x, y, &box))
	return;
    box = *REGION_EXTENTS(sprite.hot.pScreen, shape);
    /* this is rather crude */
    do {
	x += incx;
	if (x >= box.x2)
	{
	    incx = -1;
	    x = *px - 1;
	}
	else if (x < box.x1)
	{
	    incx = 1;
	    x = *px;
	    y += incy;
	    if (y >= box.y2)
	    {
		incy = -1;
		y = *py - 1;
	    }
	    else if (y < box.y1)
		return; /* should never get here! */
	}
    } while (!POINT_IN_REGION(sprite.hot.pScreen, shape, x, y, &box));
    *px = x;
    *py = y;
}
#endif

static void
#if NeedFunctionPrototypes
CheckPhysLimits(
    CursorPtr cursor,
    Bool generateEvents,
    Bool confineToScreen,
    ScreenPtr pScreen)
#else
CheckPhysLimits(cursor, generateEvents, confineToScreen, pScreen)
    CursorPtr cursor;
    Bool generateEvents;
    Bool confineToScreen;
    ScreenPtr pScreen;
#endif
{
    HotSpot new;

    if (!cursor)
	return;
    new = sprite.hotPhys;
    if (pScreen)
	new.pScreen = pScreen;
    else
	pScreen = new.pScreen;
    (*pScreen->CursorLimits) (pScreen, cursor, &sprite.hotLimits,
			      &sprite.physLimits);
    sprite.confined = confineToScreen;
    (* pScreen->ConstrainCursor)(pScreen, &sprite.physLimits);
    if (new.x < sprite.physLimits.x1)
	new.x = sprite.physLimits.x1;
    else
	if (new.x >= sprite.physLimits.x2)
	    new.x = sprite.physLimits.x2 - 1;
    if (new.y < sprite.physLimits.y1)
	new.y = sprite.physLimits.y1;
    else
	if (new.y >= sprite.physLimits.y2)
	    new.y = sprite.physLimits.y2 - 1;
#ifdef SHAPE
    if (sprite.hotShape)
	ConfineToShape(sprite.hotShape, &new.x, &new.y);
#endif
    if ((pScreen != sprite.hotPhys.pScreen) ||
	(new.x != sprite.hotPhys.x) || (new.y != sprite.hotPhys.y))
    {
	if (pScreen != sprite.hotPhys.pScreen)
	    sprite.hotPhys = new;
	(*pScreen->SetCursorPosition) (pScreen, new.x, new.y, generateEvents);
	if (!generateEvents)
	    SyntheticMotion(new.x, new.y);
    }
}

static void
#if NeedFunctionPrototypes
CheckVirtualMotion(
    register QdEventPtr qe,
    register WindowPtr pWin)
#else
CheckVirtualMotion(qe, pWin)
    register QdEventPtr qe;
    register WindowPtr pWin;
#endif
{

    if (qe)
    {
	sprite.hot.pScreen = qe->pScreen;
	sprite.hot.x = qe->event->u.keyButtonPointer.rootX;
	sprite.hot.y = qe->event->u.keyButtonPointer.rootY;
	pWin = inputInfo.pointer->grab ? inputInfo.pointer->grab->confineTo :
					 NullWindow;
    }
    if (pWin)
    {
	BoxRec lims;

	if (sprite.hot.pScreen != pWin->drawable.pScreen)
	{
	    sprite.hot.pScreen = pWin->drawable.pScreen;
	    sprite.hot.x = sprite.hot.y = 0;
	}
	lims = *REGION_EXTENTS(pWin->drawable.pScreen, &pWin->borderSize);
	if (sprite.hot.x < lims.x1)
	    sprite.hot.x = lims.x1;
	else if (sprite.hot.x >= lims.x2)
	    sprite.hot.x = lims.x2 - 1;
	if (sprite.hot.y < lims.y1)
	    sprite.hot.y = lims.y1;
	else if (sprite.hot.y >= lims.y2)
	    sprite.hot.y = lims.y2 - 1;
#ifdef SHAPE
	if (wBoundingShape(pWin))
	    ConfineToShape(&pWin->borderSize, &sprite.hot.x, &sprite.hot.y);
#endif
	if (qe)
	{
	    qe->pScreen = sprite.hot.pScreen;
	    qe->event->u.keyButtonPointer.rootX = sprite.hot.x;
	    qe->event->u.keyButtonPointer.rootY = sprite.hot.y;
	}
    }
    ROOT = WindowTable[sprite.hot.pScreen->myNum];
}

void
ConfineCursorToWindow(pWin, generateEvents, confineToScreen)
    WindowPtr pWin;
    Bool generateEvents;
    Bool confineToScreen;
{
    ScreenPtr pScreen = pWin->drawable.pScreen;

    if (syncEvents.playingEvents)
    {
	CheckVirtualMotion((QdEventPtr)NULL, pWin);
	SyntheticMotion(sprite.hot.x, sprite.hot.y);
    }
    else
    {
	sprite.hotLimits = *REGION_EXTENTS( pScreen, &pWin->borderSize);
#ifdef SHAPE
	sprite.hotShape = wBoundingShape(pWin) ? &pWin->borderSize
					       : NullRegion;
#endif
	CheckPhysLimits(sprite.current, generateEvents, confineToScreen,
			pScreen);
    }
}

Bool
PointerConfinedToScreen()
{
    return sprite.confined;
}

static void
#if NeedFunctionPrototypes
ChangeToCursor(CursorPtr cursor)
#else
ChangeToCursor(cursor)
    CursorPtr cursor;
#endif
{
    if (cursor != sprite.current)
    {
	if ((sprite.current->bits->xhot != cursor->bits->xhot) ||
		(sprite.current->bits->yhot != cursor->bits->yhot))
	    CheckPhysLimits(cursor, FALSE, PointerConfinedToScreen(),
			    (ScreenPtr)NULL);
	(*sprite.hotPhys.pScreen->DisplayCursor) (sprite.hotPhys.pScreen,
						  cursor);
	sprite.current = cursor;
    }
}

/* returns true if b is a descendent of a */
Bool
IsParent(a, b)
    register WindowPtr a, b;
{
    for (b = b->parent; b; b = b->parent)
	if (b == a) return TRUE;
    return FALSE;
}

static void
#if NeedFunctionPrototypes
PostNewCursor(void)
#else
PostNewCursor()
#endif
{