darwinEvents.c   [plain text]

/*
 * Darwin event queue and event handling
 */
/*
Copyright (c) 2002-2004 Torrey T. Lyons. All Rights Reserved.
Copyright 2004 Kaleb S. KEITHLEY. All Rights Reserved.

This file is based on mieq.c by Keith Packard,
which contains the following copyright:
Copyright 1990, 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.
 */

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#define NEED_EVENTS
#include   <X11/X.h>
#include   <X11/Xmd.h>
#include   <X11/Xproto.h>
#include   "misc.h"
#include   "windowstr.h"
#include   "pixmapstr.h"
#include   "inputstr.h"
#include   "mi.h"
#include   "scrnintstr.h"
#include   "mipointer.h"
#include "darwin.h"
#include "quartz.h"
#include "darwinKeyboard.h"

#include <sys/types.h>
#include <sys/uio.h>
#include <unistd.h>
#include <IOKit/hidsystem/IOLLEvent.h>

#define QUEUE_SIZE 256

typedef struct _Event {
    xEvent      event;
    ScreenPtr   pScreen;
} EventRec, *EventPtr;

typedef struct _EventQueue {
    HWEventQueueType    head, tail; /* long for SetInputCheck */
    CARD32      lastEventTime;      /* to avoid time running backwards */
    Bool        lastMotion;
    EventRec    events[QUEUE_SIZE]; /* static allocation for signals */
    DevicePtr   pKbd, pPtr;         /* device pointer, to get funcs */
    ScreenPtr   pEnqueueScreen;     /* screen events are being delivered to */
    ScreenPtr   pDequeueScreen;     /* screen events are being dispatched to */
} EventQueueRec, *EventQueuePtr;

static EventQueueRec darwinEventQueue;
#define KeyPressed(k) (((DeviceIntPtr)darwinEventQueue.pKbd)->key->down[k >> 3] & (1 << (k & 7)))

#ifdef NX_DEVICELCTLKEYMASK
#define CONTROL_MASK(flags) (flags & (NX_DEVICELCTLKEYMASK|NX_DEVICERCTLKEYMASK))
#else
#define CONTROL_MASK(flags) (NX_CONTROLMASK)
#endif /* NX_DEVICELCTLKEYMASK */

#ifdef NX_DEVICELSHIFTKEYMASK
#define SHIFT_MASK(flags) (flags & (NX_DEVICELSHIFTKEYMASK|NX_DEVICERSHIFTKEYMASK))
#else
#define SHIFT_MASK(flags) (NX_SHIFTMASK)
#endif /* NX_DEVICELSHIFTKEYMASK */

#ifdef NX_DEVICELCMDKEYMASK
#define COMMAND_MASK(flags) (flags & (NX_DEVICELCMDKEYMASK|NX_DEVICERCMDKEYMASK))
#else
#define COMMAND_MASK(flags) (NX_COMMANDMASK)
#endif /* NX_DEVICELCMDKEYMASK */

#ifdef NX_DEVICELALTKEYMASK
#define ALTERNATE_MASK(flags) (flags & (NX_DEVICELALTKEYMASK|NX_DEVICERALTKEYMASK))
#else
#define ALTERNATE_MASK(flags) (NX_ALTERNATEMASK)
#endif /* NX_DEVICELALTKEYMASK */

#define KEYBOARD_MASK (NX_COMMANDMASK | NX_CONTROLMASK | NX_ALTERNATEMASK | NX_SHIFTMASK | \
                       NX_SECONDARYFNMASK | NX_ALPHASHIFTMASK | NX_NUMERICPADMASK | \
                       NX_HELPMASK | NX_DEVICELCTLKEYMASK | NX_DEVICELSHIFTKEYMASK | \
		       NX_DEVICERSHIFTKEYMASK | NX_DEVICELCMDKEYMASK | NX_DEVICERCMDKEYMASK | \
		       NX_DEVICELALTKEYMASK | NX_DEVICERALTKEYMASK | NX_DEVICERCTLKEYMASK)
                      
char * decode_event_flags(unsigned int modifiers) {
  char buf[1024];
  buf[0]='\0';
  if (modifiers & NX_DEVICELCTLKEYMASK)   strcat(buf, "NX_DEVICELCTLKEYMASK | ");
  if (modifiers & NX_DEVICELSHIFTKEYMASK) strcat(buf, "NX_DEVICELSHIFTKEYMASK | ");
  if (modifiers & NX_DEVICERSHIFTKEYMASK) strcat(buf, "NX_DEVICERSHIFTKEYMASK | ");
  if (modifiers & NX_DEVICELCMDKEYMASK)   strcat(buf, "NX_DEVICELCMDKEYMASK | ");
  if (modifiers & NX_DEVICERCMDKEYMASK)   strcat(buf, "NX_DEVICERCMDKEYMASK | ");
  if (modifiers & NX_DEVICELALTKEYMASK)   strcat(buf, "NX_DEVICELALTKEYMASK | ");
  if (modifiers & NX_DEVICERALTKEYMASK)   strcat(buf, "NX_DEVICERALTKEYMASK | ");
  if (modifiers & NX_DEVICERCTLKEYMASK)   strcat(buf, "NX_DEVICERCTLKEYMASK | ");

  if (modifiers & NX_ALPHASHIFTMASK)      strcat(buf, "NX_ALPHASHIFTMASK | ");
  if (modifiers & NX_SHIFTMASK)           strcat(buf, "NX_SHIFTMASK | ");
  if (modifiers & NX_CONTROLMASK)         strcat(buf, "NX_CONTROLMASK | ");
  if (modifiers & NX_ALTERNATEMASK)       strcat(buf, "NX_ALTERNATEMASK | ");
  if (modifiers & NX_COMMANDMASK)         strcat(buf, "NX_COMMANDMASK | ");
  if (modifiers & NX_NUMERICPADMASK)      strcat(buf, "NX_NUMERICPADMASK | ");
  if (modifiers & NX_HELPMASK)            strcat(buf, "NX_HELPMASK | ");
  if (modifiers & NX_SECONDARYFNMASK)     strcat(buf, "NX_SECONDARYFNMASK | ");

  if (modifiers & NX_STYLUSPROXIMITYMASK) strcat(buf, "NX_STYLUSPROXIMITYMASK | ");
  if (modifiers & NX_NONCOALSESCEDMASK)   strcat(buf, "NX_NONCOALSESCEDMASK | ");
  if (modifiers & NX_NULLEVENTMASK)       strcat(buf, "NX_NULLEVENTMASK | ");
  //  if (modifiers & NX_LMOUSEDOWNMASK)      strcat(buf, "NX_LMOUSEDOWNMASK | ");
  //  if (modifiers & NX_LMOUSEUPMASK)        strcat(buf, "NX_LMOUSEUPMASK | ");
  //  if (modifiers & NX_RMOUSEDOWNMASK)      strcat(buf, "NX_RMOUSEDOWNMASK | ");
  //  if (modifiers & NX_RMOUSEUPMASK)        strcat(buf, "NX_RMOUSEUPMASK | ");
  //  if (modifiers & NX_OMOUSEDOWNMASK)      strcat(buf, "NX_OMOUSEDOWNMASK | ");
  //  if (modifiers & NX_OMOUSEUPMASK)        strcat(buf, "NX_OMOUSEUPMASK | ");
  //  if (modifiers & NX_MOUSEMOVEDMASK)      strcat(buf, "NX_MOUSEMOVEDMASK | ");
  // if (modifiers & NX_LMOUSEDRAGGEDMASK)   strcat(buf, "NX_LMOUSEDRAGGEDMASK | ");
  //if (modifiers & NX_RMOUSEDRAGGEDMASK)   strcat(buf, "NX_RMOUSEDRAGGEDMASK | ");
  //if (modifiers & NX_OMOUSEDRAGGEDMASK)   strcat(buf, "NX_OMOUSEDRAGGEDMASK | ");
  //if (modifiers & NX_MOUSEENTEREDMASK)    strcat(buf, "NX_MOUSEENTEREDMASK | ");
  //if (modifiers & NX_MOUSEEXITEDMASK)     strcat(buf, "NX_MOUSEEXITEDMASK | ");
  if (modifiers & NX_KEYDOWNMASK)         strcat(buf, "NX_KEYDOWNMASK | ");
  if (modifiers & NX_KEYUPMASK)           strcat(buf, "NX_KEYUPMASK | ");
  if (modifiers & NX_FLAGSCHANGEDMASK)    strcat(buf, "NX_FLAGSCHANGEDMASK | ");
  if (modifiers & NX_KITDEFINEDMASK)      strcat(buf, "NX_KITDEFINEDMASK | ");
  if (modifiers & NX_SYSDEFINEDMASK)      strcat(buf, "NX_SYSDEFINEDMASK | ");
  if (modifiers & NX_APPDEFINEDMASK)      strcat(buf, "NX_APPDEFINEDMASK | ");
  
  if (strlen(buf) < 5) strcpy(buf, "(empty)");
  else buf[strlen(buf)-3]='\0';
  return strdup(buf);
}

char * get_keysym_name(int ks) {
  switch(ks) {
  case XK_Alt_L: return "XK_Alt_L";
  case XK_Alt_R: return "XK_Alt_R";
  case XK_Meta_L: return "XK_Meta_L";
  case XK_Meta_R: return "XK_Meta_R";
  case XK_Control_L: return "XK_Control_L";
  case XK_Control_R: return "XK_Control_R";
  case XK_Shift_L: return "XK_Shift_L";
  case XK_Shift_R: return "XK_Shift_R";
  case XK_Mode_switch: return "XK_Mode_switch";
  case XK_Caps_Lock: return "XK_Caps_Lock";
  }
  return "???";
}

/*
 * DarwinPressModifierMask
 *  Press or release the given modifier key, specified by its mask.
 */
static void DarwinPressModifierMask(
    xEvent *xe,     // must already have type, time and mouse location
    int mask)       // one of NX_*MASK constants
{
  int key, keycode;
  key = DarwinModifierNXMaskToNXKey(mask);
  if (key == -1) {
    ErrorF("DarwinPressModifierMask: can't find key for mask %x\n", mask);
    return;
  }
  keycode = DarwinModifierNXKeyToNXKeycode(key, 0);    
  if (keycode == 0) {
    ErrorF("DarwinPressModifierMask: can't find keycode for mask %x\n", mask);
    return;
  }
  
  DEBUG_LOG("%x: %s %s\n", mask, xe->u.u.type==KeyPress?"pressing":"releasing",
	    decode_event_flags(mask));
  
  xe->u.u.detail = keycode + MIN_KEYCODE;
  (*darwinEventQueue.pKbd->processInputProc)(xe,
           (DeviceIntPtr)darwinEventQueue.pKbd, 1);
}

/*
 * DarwinUpdateModifiers
 *  Send events to update the modifier state.
 */
static void DarwinUpdateModifiers(
    xEvent *xe,         // event template with time and mouse position set
    int pressed,        // KeyPress or KeyRelease
    unsigned int flags )         // modifier flags that have changed
{
  int i;
  DEBUG_LOG("DarwinUpdateModifiers(%p, %d, %x, %s)\n", xe, pressed, flags, decode_event_flags(flags));
  xe->u.u.type = pressed;
  /* If we have "device specific" flags -- meaning, left or right -- then strip out the generic flag */
  if (flags & (NX_DEVICELCTLKEYMASK | NX_DEVICERCTLKEYMASK)) flags &= ~NX_CONTROLMASK;
  if (flags & (NX_DEVICELALTKEYMASK | NX_DEVICERALTKEYMASK)) flags &= ~NX_ALTERNATEMASK;
  if (flags & (NX_DEVICELCMDKEYMASK | NX_DEVICERCMDKEYMASK)) flags &= ~NX_COMMANDMASK;
  if (flags & (NX_DEVICELSHIFTKEYMASK | NX_DEVICERSHIFTKEYMASK)) flags &= ~NX_SHIFTMASK;
  if (flags == NX_ALPHASHIFTMASK) {
    // Alpha shift only sees KeyDown when enabled and KeyUp when disabled,
    // but X11 wants to see a up/down pair to enable, and again to disable
    xe->u.u.type = KeyPress;
    DarwinPressModifierMask(xe, NX_ALPHASHIFTMASK);
    xe->u.u.type = KeyRelease;
    DarwinPressModifierMask(xe, NX_ALPHASHIFTMASK);
    flags &= ~NX_ALPHASHIFTMASK;
  }
  for(i=0; i < (sizeof(flags)*8); i++) 
    if (flags & (1 << i)) DarwinPressModifierMask(xe, flags & (1 << i));
}

/*
 * DarwinReleaseModifiers
 * This hacky function releases all modifier keys.  It should be called when X11.app
 * is deactivated (kXDarwinDeactivate) to prevent modifiers from getting stuck if they
 * are held down during a "context" switch -- otherwise, we would miss the KeyUp.
 */
void DarwinReleaseModifiers(void) {
  KeySym *map = NULL;
  xEvent ke;
  int i = 0; 
 
  DEBUG_LOG("DarwinReleaseModifiers(%p)\n", &keyInfo.keyMap);
  
  for (i = MIN_KEYCODE, map =keyInfo.keyMap;
       i < MAX_KEYCODE;
       i++, map += GLYPHS_PER_KEY) {
    if (KeyPressed(i)) {
      switch (*map) {
	/* Don't release the lock keys */
      case XK_Caps_Lock:
      case XK_Shift_Lock:
      case XK_Num_Lock:
      case XK_Scroll_Lock:
      case XK_Kana_Lock:
	break;
      default:
	DEBUG_LOG("DarwinReleaseModifiers: releasing key %d (%s)\n", i, get_keysym_name(*map));
	  ke.u.keyButtonPointer.time = GetTimeInMillis();
	  ke.u.keyButtonPointer.rootX = 0;
	  ke.u.keyButtonPointer.rootY = 0;
	  ke.u.u.type = KeyRelease;
	  ke.u.u.detail = i;
	  (*darwinEventQueue.pKbd->processInputProc)(&ke,
		    (DeviceIntPtr)darwinEventQueue.pKbd, 1);
	break;
      }
    }
  }
  ProcessInputEvents();
}

/*
 * DarwinSimulateMouseClick
 *  Send a mouse click to X when multiple mouse buttons are simulated
 *  with modifier-clicks, such as command-click for button 2. The dix
 *  layer is told that the previously pressed modifier key(s) are
 *  released, the simulated click event is sent. After the mouse button
 *  is released, the modifier keys are reverted to their actual state,
 *  which may or may not be pressed at that point. This is usually
 *  closest to what the user wants. Ie. the user typically wants to
 *  simulate a button 2 press instead of Command-button 2.
 */
static void DarwinSimulateMouseClick(
    xEvent *xe,         // event template with time and
                        // mouse position filled in
    int whichButton,    // mouse button to be pressed
    int modifierMask)   // modifiers used for the fake click
{
  DEBUG_LOG("DarwinSimulateMouseClick(%p, %d, %x)\n", xe, whichButton, modifierMask);
    // first fool X into forgetting about the keys
	// for some reason, it's not enough to tell X we released the Command key -- 
	// it has to be the *left* Command key.
	if (modifierMask & NX_COMMANDMASK) modifierMask |=NX_DEVICELCMDKEYMASK ;
    DarwinUpdateModifiers(xe, KeyRelease, modifierMask);

    // push the mouse button
    xe->u.u.type = ButtonPress;
    xe->u.u.detail = whichButton;
    (*darwinEventQueue.pPtr->processInputProc)
            (xe, (DeviceIntPtr)darwinEventQueue.pPtr, 1);
}


Bool
DarwinEQInit(
    DevicePtr pKbd,
    DevicePtr pPtr)
{
    darwinEventQueue.head = darwinEventQueue.tail = 0;
    darwinEventQueue.lastEventTime = GetTimeInMillis ();
    darwinEventQueue.pKbd = pKbd;
    darwinEventQueue.pPtr = pPtr;
    darwinEventQueue.pEnqueueScreen = screenInfo.screens[0];
    darwinEventQueue.pDequeueScreen = darwinEventQueue.pEnqueueScreen;
    SetInputCheck (&darwinEventQueue.head, &darwinEventQueue.tail);
    return TRUE;
}


/*
 * DarwinEQEnqueue
 *  Must be thread safe with ProcessInputEvents.
 *    DarwinEQEnqueue    - called from event gathering thread
 *    ProcessInputEvents - called from X server thread
 *  DarwinEQEnqueue should never be called from more than one thread.
 */
void
DarwinEQEnqueue(
    const xEvent *e)
{
    HWEventQueueType oldtail, newtail;
    char byte = 0;

    oldtail = darwinEventQueue.tail;

    // mieqEnqueue() collapses successive motion events into one event.
    // This is difficult to do in a thread-safe way and rarely useful.

    newtail = oldtail + 1;
    if (newtail == QUEUE_SIZE)
        newtail = 0;
    /* Toss events which come in late */
    if (newtail == darwinEventQueue.head)
        return;

    darwinEventQueue.events[oldtail].event = *e;
    /*
     * Make sure that event times don't go backwards - this
     * is "unnecessary", but very useful
     */
    if (e->u.keyButtonPointer.time < darwinEventQueue.lastEventTime &&
        darwinEventQueue.lastEventTime - e->u.keyButtonPointer.time < 10000)
    {
        darwinEventQueue.events[oldtail].event.u.keyButtonPointer.time =
        darwinEventQueue.lastEventTime;
    }
    darwinEventQueue.events[oldtail].pScreen = darwinEventQueue.pEnqueueScreen;

    // Update the tail after the event is prepared
    darwinEventQueue.tail = newtail;

    // Signal there is an event ready to handle
    write(darwinEventWriteFD, &byte, 1);
}


/*
 * DarwinEQPointerPost
 *  Post a pointer event. Used by the mipointer.c routines.
 */
void
DarwinEQPointerPost(
    xEvent *e)
{
    (*darwinEventQueue.pPtr->processInputProc)
            (e, (DeviceIntPtr)darwinEventQueue.pPtr, 1);
}


void
DarwinEQSwitchScreen(
    ScreenPtr   pScreen,
    Bool        fromDIX)
{
    darwinEventQueue.pEnqueueScreen = pScreen;
    if (fromDIX)
        darwinEventQueue.pDequeueScreen = pScreen;
}


/*
 * ProcessInputEvents
 *  Read and process events from the event queue until it is empty.
 */
void ProcessInputEvents(void)
{
    EventRec *e;
    int     x, y;
    xEvent  xe;
    static int  old_flags = 0;  // last known modifier state
    // button number and modifier mask of currently pressed fake button
    static int darwinFakeMouseButtonDown = 0;
    static int darwinFakeMouseButtonMask = 0;

    // Empty the signaling pipe
    x = sizeof(xe);
    while (x == sizeof(xe)) {
        x = read(darwinEventReadFD, &xe, sizeof(xe));
    }

    while (darwinEventQueue.head != darwinEventQueue.tail)
    {
        if (screenIsSaved == SCREEN_SAVER_ON)
            SaveScreens (SCREEN_SAVER_OFF, ScreenSaverReset);

        e = &darwinEventQueue.events[darwinEventQueue.head];
        xe = e->event;

        // Shift from global screen coordinates to coordinates relative to
        // the origin of the current screen.
        xe.u.keyButtonPointer.rootX -= darwinMainScreenX +
                dixScreenOrigins[miPointerCurrentScreen()->myNum].x;
        xe.u.keyButtonPointer.rootY -= darwinMainScreenY +
                dixScreenOrigins[miPointerCurrentScreen()->myNum].y;

        /*
         * Assumption - screen switching can only occur on motion events
         */
        if (e->pScreen != darwinEventQueue.pDequeueScreen)
        {
            darwinEventQueue.pDequeueScreen = e->pScreen;
            x = xe.u.keyButtonPointer.rootX;
            y = xe.u.keyButtonPointer.rootY;
            if (darwinEventQueue.head == QUEUE_SIZE - 1)
                darwinEventQueue.head = 0;
            else
                ++darwinEventQueue.head;
            NewCurrentScreen (darwinEventQueue.pDequeueScreen, x, y);
        }
        else
        {
            if (darwinEventQueue.head == QUEUE_SIZE - 1)
                darwinEventQueue.head = 0;
            else
                ++darwinEventQueue.head;
            switch (xe.u.u.type)
            {
            case KeyPress:
                if (old_flags == 0
                    && darwinSyncKeymap && darwinKeymapFile == NULL)
                {
                    /* See if keymap has changed. */

                    static unsigned int last_seed;
                    unsigned int this_seed;

                    this_seed = QuartzSystemKeymapSeed();
                    if (this_seed != last_seed)
                    {
                        last_seed = this_seed;
                        DarwinKeyboardReload(darwinKeyboard);
                    }
                }
                /* fall through */

            case KeyRelease:
                xe.u.u.detail += MIN_KEYCODE;
                (*darwinEventQueue.pKbd->processInputProc)
                    (&xe, (DeviceIntPtr)darwinEventQueue.pKbd, 1);
                break;

            case ButtonPress:
                miPointerAbsoluteCursor(xe.u.keyButtonPointer.rootX,
                                        xe.u.keyButtonPointer.rootY,
                                        xe.u.keyButtonPointer.time);
                if (darwinFakeButtons && xe.u.u.detail == 1) {
                    // Mimic multi-button mouse with modifier-clicks
                    // If both sets of modifiers are pressed,
                    // button 2 is clicked.
                    if ((old_flags & darwinFakeMouse2Mask) ==
                        darwinFakeMouse2Mask)
                    {
                        DarwinSimulateMouseClick(&xe, 2, darwinFakeMouse2Mask);
                        darwinFakeMouseButtonDown = 2;
                        darwinFakeMouseButtonMask = darwinFakeMouse2Mask;
                        break;
                    }
                    else if ((old_flags & darwinFakeMouse3Mask) ==
                             darwinFakeMouse3Mask)
                    {
                        DarwinSimulateMouseClick(&xe, 3, darwinFakeMouse3Mask);
                        darwinFakeMouseButtonDown = 3;
                        darwinFakeMouseButtonMask = darwinFakeMouse3Mask;
                        break;
                    }
                }
                (*darwinEventQueue.pPtr->processInputProc)
                        (&xe, (DeviceIntPtr)darwinEventQueue.pPtr, 1);
                break;

            case ButtonRelease:
                miPointerAbsoluteCursor(xe.u.keyButtonPointer.rootX,
                                        xe.u.keyButtonPointer.rootY,
                                        xe.u.keyButtonPointer.time);
                if (darwinFakeButtons && xe.u.u.detail == 1 &&
                    darwinFakeMouseButtonDown)
                {
                    // If last mousedown was a fake click, don't check for
                    // mouse modifiers here. The user may have released the
                    // modifiers before the mouse button.
                    xe.u.u.detail = darwinFakeMouseButtonDown;
                    darwinFakeMouseButtonDown = 0;
                    (*darwinEventQueue.pPtr->processInputProc)
                            (&xe, (DeviceIntPtr)darwinEventQueue.pPtr, 1);

                    // Bring modifiers back up to date
                    DarwinUpdateModifiers(&xe, KeyPress,
                            darwinFakeMouseButtonMask & old_flags);
                    darwinFakeMouseButtonMask = 0;
                } else {
                    (*darwinEventQueue.pPtr->processInputProc)
                            (&xe, (DeviceIntPtr)darwinEventQueue.pPtr, 1);
                }
                break;

            case MotionNotify:
                miPointerAbsoluteCursor(xe.u.keyButtonPointer.rootX,
                                        xe.u.keyButtonPointer.rootY,
                                        xe.u.keyButtonPointer.time);
                break;

            case kXDarwinUpdateModifiers:
            {
                // Update modifier state.
                // Any amount of modifiers may have changed.
	      unsigned int flags = xe.u.clientMessage.u.l.longs0 & ~NX_NONCOALSESCEDMASK; // ignore that one
		DEBUG_LOG("kxDarwinUpdateModifiers(%x, %x, %s)\n", old_flags, flags, decode_event_flags(flags));
		//		DEBUG_LOG("Ignoring these flags: %x %s\n", flags & ~KEYBOARD_MASK, decode_event_flags(flags & ~KEYBOARD_MASK));
		flags &= KEYBOARD_MASK;
                if (old_flags & ~flags) DarwinUpdateModifiers(&xe, KeyRelease,
							      old_flags & ~flags);
                if (~old_flags & flags) DarwinUpdateModifiers(&xe, KeyPress,
							      ~old_flags & flags);
                old_flags = flags;
                break;
            }

            case kXDarwinUpdateButtons:
            {
                long hwDelta = xe.u.clientMessage.u.l.longs0;
                long hwButtons = xe.u.clientMessage.u.l.longs1;
                int i;

                for (i = 1; i < 5; i++) {
                    if (hwDelta & (1 << i)) {
                        // IOKit and X have different numbering for the
                        // middle and right mouse buttons.
                        if (i == 1) {
                            xe.u.u.detail = 3;
                        } else if (i == 2) {
                            xe.u.u.detail = 2;
                        } else {
                            xe.u.u.detail = i + 1;
                        }
                        if (hwButtons & (1 << i)) {
                            xe.u.u.type = ButtonPress;
                        } else {
                            xe.u.u.type = ButtonRelease;
                        }
                        (*darwinEventQueue.pPtr->processInputProc)
                    (&xe, (DeviceIntPtr)darwinEventQueue.pPtr, 1);
                    }
                }
                break;
            }

	    case kXDarwinDeactivate:
	      DEBUG_LOG("kxDarwinDeactivate\n");
	      DarwinReleaseModifiers();
	      old_flags=0;
	      // fall through
            default:
                // Check for mode specific event
                QuartzProcessEvent(&xe);
            }
        }
    }

    miPointerUpdate();
}