gdk.c 104 KB
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/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
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 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
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 */
#include "../config.h"

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/* If you don't want to use gdk's signal handlers define this */
/* #define I_NEED_TO_ACTUALLY_DEBUG_MY_PROGRAMS 1 */

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#include <X11/Xlocale.h>
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#include <ctype.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
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#ifdef USE_XIM
#include <stdarg.h>
#endif
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#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif /* HAVE_SYS_SELECT_H_ */

#define XLIB_ILLEGAL_ACCESS
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xos.h>
#include <X11/Xutil.h>
#include <X11/Xmu/WinUtil.h>
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#ifdef USE_XIM
#include <X11/Xresource.h>
#endif
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#include <X11/cursorfont.h>
#include "gdk.h"
#include "gdkprivate.h"
#include "gdkinput.h"
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#ifdef USE_XIM
#include "gdkx.h"
#include "gdkkeysyms.h"
#endif
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#include "gdki18n.h"
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#ifndef X_GETTIMEOFDAY
#define X_GETTIMEOFDAY(tv)  gettimeofday (tv, NULL)
#endif /* X_GETTIMEOFDAY */


#define DOUBLE_CLICK_TIME      250
#define TRIPLE_CLICK_TIME      500
#define DOUBLE_CLICK_DIST      5
#define TRIPLE_CLICK_DIST      5


#ifndef NO_FD_SET
#  define SELECT_MASK fd_set
#else
#  ifndef _AIX
     typedef long fd_mask;
#  endif
#  if defined(_IBMR2)
#    define SELECT_MASK void
#  else
#    define SELECT_MASK int
#  endif
#endif


typedef struct _GdkInput      GdkInput;
typedef struct _GdkPredicate  GdkPredicate;

struct _GdkInput
{
  gint tag;
  gint source;
  GdkInputCondition condition;
  GdkInputFunction function;
  gpointer data;
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  GdkDestroyNotify destroy;
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};

struct _GdkPredicate
{
  GdkEventFunc func;
  gpointer data;
};

/* 
 * Private function declarations
 */
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static GdkEvent *gdk_event_new          (void);
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static gint      gdk_event_wait         (void);
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static gint      gdk_event_apply_filters (XEvent *xevent,
					  GdkEvent *event,
					  GList *filters);
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static gint      gdk_event_translate    (GdkEvent     *event, 
				         XEvent       *xevent);
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#if 0
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static Bool      gdk_event_get_type     (Display      *display, 
					 XEvent       *xevent, 
					 XPointer      arg);
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#endif
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static void      gdk_synthesize_click   (GdkEvent     *event, 
					 gint          nclicks);

static void      gdk_dnd_drag_begin     (GdkWindow    *initial_window);
static void      gdk_dnd_drag_enter     (Window        dest);
static void      gdk_dnd_drag_leave     (Window        dest);
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static void      gdk_dnd_drag_end       (Window        dest,
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					 GdkPoint      coords);
static GdkAtom   gdk_dnd_check_types    (GdkWindow    *window,
					 XEvent       *xevent);
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#ifdef DEBUG_DND
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static void      gdk_print_atom         (GdkAtom       anatom);
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#endif
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/* 
 * old junk from offix, we might use it though so leave it 
 */
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Window       gdk_get_client_window   (Display     *dpy, 
				      Window       win);
#ifdef WE_HAVE_MOTIF_DROPS_DONE
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static GdkWindow *  gdk_drop_get_real_window     (GdkWindow   *w, 
						  guint16     *x,
						  guint16     *y);
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#endif
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static void         gdk_exit_func                (void);
static int          gdk_x_error                  (Display     *display, 
						  XErrorEvent *error);
static int          gdk_x_io_error               (Display     *display);
static RETSIGTYPE   gdk_signal                   (int          signum);


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#ifdef USE_XIM
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static guint         gdk_im_va_count     (va_list list);
static XVaNestedList gdk_im_va_to_nested (va_list list, 
                                          guint   count);

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static GdkIM  gdk_im_get		(void);
static gint   gdk_im_open		(XrmDatabase db,
					 gchar* res_name,
					 gchar* rec_class);
static void   gdk_im_close		(void);
static void   gdk_ic_cleanup 		(void);
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#endif /* USE_XIM */

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/* Private variable declarations
 */
static int initialized = 0;                         /* 1 if the library is initialized,
						     * 0 otherwise.
						     */
static int connection_number = 0;                   /* The file descriptor number of our
						     *  connection to the X server. This
						     *  is used so that we may determine
						     *  when events are pending by using
						     *  the "select" system call.
						     */


static struct timeval start;                        /* The time at which the library was
						     *  last initialized.
						     */
static struct timeval timer;                        /* Timeout interval to use in the call
						     *  to "select". This is used in
						     *  conjunction with "timerp" to create
						     *  a maximum time to wait for an event
						     *  to arrive.
						     */
static struct timeval *timerp;                      /* The actual timer passed to "select"
						     *  This may be NULL, in which case
						     *  "select" will block until an event
						     *  arrives.
						     */
static guint32 timer_val;                           /* The timeout length as specified by
						     *  the user in milliseconds.
						     */
static GList *inputs;                               /* A list of the input file descriptors
						     *  that we care about. Each list node
						     *  contains a GdkInput struct that describes
						     *  when we are interested in the specified
						     *  file descriptor. That is, when it is
						     *  available for read, write or has an
						     *  exception pending.
						     */
static guint32 button_click_time[2];                /* The last 2 button click times. Used
						     *  to determine if the latest button click
						     *  is part of a double or triple click.
						     */
static GdkWindow *button_window[2];                 /* The last 2 windows to receive button presses.
						     *  Also used to determine if the latest button
						     *  click is part of a double or triple click.
						     */
static guint button_number[2];                      /* The last 2 buttons to be pressed.
						     */
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static GdkWindowPrivate *xgrab_window = NULL;	    /* Window that currently holds the
						     *  x pointer grab
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						     */
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#ifdef USE_XIM
static gint xim_using;				/* using XIM Protocol if TRUE */
static GdkIM xim_im;				/* global IM */
static XIMStyles* xim_styles;			/* im supports these styles */
static XIMStyle xim_best_allowed_style;
static GdkICPrivate *xim_ic;			/* currently using IC */
static GdkWindow* xim_window;			/* currently using Widow */
static GList* xim_ic_list;

#endif

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static GList *putback_events = NULL;

static gulong base_id;
static gint autorepeat;

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#ifdef G_ENABLE_DEBUG
static GDebugKey gdk_debug_keys[] = {
  {"events",        GDK_DEBUG_EVENTS},
  {"misc",          GDK_DEBUG_MISC},
  {"dnd",           GDK_DEBUG_DND},
  {"color-context", GDK_DEBUG_COLOR_CONTEXT},
  {"xim",           GDK_DEBUG_XIM}
};
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static const int gdk_ndebug_keys = sizeof(gdk_debug_keys)/sizeof(GDebugKey);

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#endif /* G_ENABLE_DEBUG */
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/*
 *--------------------------------------------------------------
 * gdk_init
 *
 *   Initialize the library for use.
 *
 * Arguments:
 *   "argc" is the number of arguments.
 *   "argv" is an array of strings.
 *
 * Results:
 *   "argc" and "argv" are modified to reflect any arguments
 *   which were not handled. (Such arguments should either
 *   be handled by the application or dismissed).
 *
 * Side effects:
 *   The library is initialized.
 *
 *--------------------------------------------------------------
 */

void
gdk_init (int    *argc,
	  char ***argv)
{
  XKeyboardState keyboard_state;
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  gint synchronize;
  gint i, j, k;
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  XClassHint *class_hint;
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  gint argc_orig = *argc;
  gchar **argv_orig;
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  argv_orig = g_malloc ((argc_orig + 1) * sizeof (char*));
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  for (i = 0; i < argc_orig; i++)
    argv_orig[i] = g_strdup ((*argv)[i]);
  argv_orig[argc_orig] = NULL;

  X_GETTIMEOFDAY (&start);

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#ifndef I_NEED_TO_ACTUALLY_DEBUG_MY_PROGRAMS
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  signal (SIGHUP, gdk_signal);
  signal (SIGINT, gdk_signal);
  signal (SIGQUIT, gdk_signal);
  signal (SIGBUS, gdk_signal);
  signal (SIGSEGV, gdk_signal);
  signal (SIGPIPE, gdk_signal);
  signal (SIGTERM, gdk_signal);
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#endif
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  gdk_display_name = NULL;

  XSetErrorHandler (gdk_x_error);
  XSetIOErrorHandler (gdk_x_io_error);

  synchronize = FALSE;

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#ifdef G_ENABLE_DEBUG
  {
    gchar *debug_string = getenv("GDK_DEBUG");
    if (debug_string != NULL)
      gdk_debug_flags = g_parse_debug_string (debug_string,
					      gdk_debug_keys,
					      gdk_ndebug_keys);
  }
#endif	/* G_ENABLE_DEBUG */

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  if (argc && argv)
    {
      if (*argc > 0)
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	{
	  gchar *d;

	  d = strrchr((*argv)[0],'/');
	  if (d != NULL)
	    gdk_progname = g_strdup (d + 1);
	  else
	    gdk_progname = g_strdup ((*argv)[0]);
	  GDK_NOTE (MISC,
		    g_print ("Gdk: progname: \"%s\"\n", gdk_progname));
	}
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      for (i = 1; i < *argc;)
	{
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#ifdef G_ENABLE_DEBUG	  
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	  if ((strcmp ("--gdk-debug", (*argv)[i]) == 0) ||
	      (strncmp ("--gdk-debug=", (*argv)[i], 12) == 0))
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	    {
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	      gchar *equal_pos = strchr ((*argv)[i], '=');
	      
	      if (equal_pos != NULL)
		{
		  gdk_debug_flags |= g_parse_debug_string (equal_pos+1,
							   gdk_debug_keys,
							   gdk_ndebug_keys);
		}
	      else if ((i + 1) < *argc && (*argv)[i + 1])
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		{
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		  gdk_debug_flags |= g_parse_debug_string ((*argv)[i+1],
							   gdk_debug_keys,
							   gdk_ndebug_keys);
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		  (*argv)[i] = NULL;
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		  i += 1;
		}
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	      (*argv)[i] = NULL;
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	    }
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	  else if ((strcmp ("--gdk-no-debug", (*argv)[i]) == 0) ||
		   (strncmp ("--gdk-no-debug=", (*argv)[i], 15) == 0))
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	    {
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	      gchar *equal_pos = strchr ((*argv)[i], '=');
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	      if (equal_pos != NULL)
		{
		  gdk_debug_flags &= ~g_parse_debug_string (equal_pos+1,
							    gdk_debug_keys,
							    gdk_ndebug_keys);
		}
	      else if ((i + 1) < *argc && (*argv)[i + 1])
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		{
		  gdk_debug_flags &= ~g_parse_debug_string ((*argv)[i+1],
							    gdk_debug_keys,
							    gdk_ndebug_keys);
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		  (*argv)[i] = NULL;
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		  i += 1;
		}
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	      (*argv)[i] = NULL;
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	    }
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	  else 
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#endif /* G_ENABLE_DEBUG */
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	    if (strcmp ("--display", (*argv)[i]) == 0)
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	    {
	      (*argv)[i] = NULL;
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	      if ((i + 1) < *argc && (*argv)[i + 1])
		{
		  gdk_display_name = g_strdup ((*argv)[i + 1]);
		  (*argv)[i + 1] = NULL;
		  i += 1;
		}
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	    }
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	  else if (strcmp ("--sync", (*argv)[i]) == 0)
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	    {
	      (*argv)[i] = NULL;
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	      synchronize = TRUE;
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	    }
	  else if (strcmp ("--no-xshm", (*argv)[i]) == 0)
	    {
	      (*argv)[i] = NULL;
	      gdk_use_xshm = FALSE;
	    }
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	  else if (strcmp ("--name", (*argv)[i]) == 0)
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	    {
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	      if ((i + 1) < *argc && (*argv)[i + 1])
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		{
		  (*argv)[i++] = NULL;
		  gdk_progname = (*argv)[i];
		  (*argv)[i] = NULL;
		}
	    }
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	  else if (strcmp ("--class", (*argv)[i]) == 0)
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	    {
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	      if ((i + 1) < *argc && (*argv)[i + 1])
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		{
		  (*argv)[i++] = NULL;
		  gdk_progclass = (*argv)[i];
		  (*argv)[i] = NULL;
		}
	    }
#ifdef XINPUT_GXI
	  else if (strcmp ("--gxid_host", (*argv)[i]) == 0)
	    {
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	      if ((i + 1) < *argc && (*argv)[i + 1])
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		{
		  (*argv)[i++] = NULL;
		  gdk_input_gxid_host = ((*argv)[i]);
		  (*argv)[i] = NULL;
		}
	    }
	  else if (strcmp ("--gxid_port", (*argv)[i]) == 0)
	    {
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	      if ((i + 1) < *argc && (*argv)[i + 1])
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		{
		  (*argv)[i++] = NULL;
		  gdk_input_gxid_port = atoi ((*argv)[i]);
		  (*argv)[i] = NULL;
		}
	    }
#endif
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#ifdef USE_XIM
	  else if (strcmp ("--xim-preedit", (*argv)[i]) == 0)
	    {
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	      if ((i + 1) < *argc && (*argv)[i + 1])
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		{
		  (*argv)[i++] = NULL;
		  if (strcmp ("none", (*argv)[i]) == 0)
		    gdk_im_set_best_style (GdkIMPreeditNone);
		  else if (strcmp ("nothing", (*argv)[i]) == 0)
		    gdk_im_set_best_style (GdkIMPreeditNothing);
		  else if (strcmp ("area", (*argv)[i]) == 0)
		    gdk_im_set_best_style (GdkIMPreeditArea);
		  else if (strcmp ("position", (*argv)[i]) == 0)
		    gdk_im_set_best_style (GdkIMPreeditPosition);
		  else if (strcmp ("callbacks", (*argv)[i]) == 0)
		    gdk_im_set_best_style (GdkIMPreeditCallbacks);
		}
	    }
	  else if (strcmp ("--xim-status", (*argv)[i]) == 0)
	    {
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	      if ((i + 1) < *argc && (*argv)[i + 1])
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		{
		  (*argv)[i++] = NULL;
		  if (strcmp ("none", (*argv)[i]) == 0)
		    gdk_im_set_best_style (GdkIMStatusNone);
		  else if (strcmp ("nothing", (*argv)[i]) == 0)
		    gdk_im_set_best_style (GdkIMStatusNothing);
		  else if (strcmp ("area", (*argv)[i]) == 0)
		    gdk_im_set_best_style (GdkIMStatusArea);
		  else if (strcmp ("callbacks", (*argv)[i]) == 0)
		    gdk_im_set_best_style (GdkIMStatusCallbacks);
		}
	    }
#endif

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	  i += 1;
	}

      for (i = 1; i < *argc; i++)
	{
	  for (k = i; k < *argc; k++)
	    if ((*argv)[k] != NULL)
	      break;

	  if (k > i)
	    {
	      k -= i;
	      for (j = i + k; j < *argc; j++)
		(*argv)[j-k] = (*argv)[j];
	      *argc -= k;
	    }
	}
    }
  else
    {
      gdk_progname = "<unknown>";
    }

  gdk_display = XOpenDisplay (gdk_display_name);
  if (!gdk_display)
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    {
      g_warning ("cannot open display: %s", XDisplayName (gdk_display_name));
      exit(1);
    }
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  /* This is really crappy. We have to look into the display structure
   *  to find the base resource id. This is only needed for recording
   *  and playback of events.
   */
  /* base_id = RESOURCE_BASE; */
  base_id = 0;
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  GDK_NOTE (EVENTS, g_print ("base id: %lu\n", base_id));
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  connection_number = ConnectionNumber (gdk_display);
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  GDK_NOTE (MISC,
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    g_print ("Gdk: connection number: %d\n", connection_number));
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  if (synchronize)
    XSynchronize (gdk_display, True);

  gdk_screen = DefaultScreen (gdk_display);
  gdk_root_window = RootWindow (gdk_display, gdk_screen);

  gdk_leader_window = XCreateSimpleWindow(gdk_display, gdk_root_window,
					  10, 10, 10, 10, 0, 0 , 0);
  class_hint = XAllocClassHint();
  class_hint->res_name = gdk_progname;
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  if (gdk_progclass == NULL)
    {
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      gdk_progclass = g_strdup (gdk_progname);
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      gdk_progclass[0] = toupper (gdk_progclass[0]);
    }
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  class_hint->res_class = gdk_progclass;
  XSetClassHint(gdk_display, gdk_leader_window, class_hint);
  XSetCommand(gdk_display, gdk_leader_window, argv_orig, argc_orig);
  XFree (class_hint);
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  for (i = 0; i < argc_orig; i++)
    g_free(argv_orig[i]);
  g_free(argv_orig);
  
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  gdk_wm_delete_window = XInternAtom (gdk_display, "WM_DELETE_WINDOW", True);
  gdk_wm_take_focus = XInternAtom (gdk_display, "WM_TAKE_FOCUS", True);
  gdk_wm_protocols = XInternAtom (gdk_display, "WM_PROTOCOLS", True);
  gdk_wm_window_protocols[0] = gdk_wm_delete_window;
  gdk_wm_window_protocols[1] = gdk_wm_take_focus;
  gdk_selection_property = XInternAtom (gdk_display, "GDK_SELECTION", False);

  gdk_dnd.gdk_XdeEnter = gdk_atom_intern("_XDE_ENTER", FALSE);
  gdk_dnd.gdk_XdeLeave = gdk_atom_intern("_XDE_LEAVE", FALSE);
  gdk_dnd.gdk_XdeRequest = gdk_atom_intern("_XDE_REQUEST", FALSE);
  gdk_dnd.gdk_XdeDataAvailable = gdk_atom_intern("_XDE_DATA_AVAILABLE", FALSE);
  gdk_dnd.gdk_XdeTypelist = gdk_atom_intern("_XDE_TYPELIST", FALSE);
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  gdk_dnd.c->gdk_cursor_dragdefault = XCreateFontCursor(gdk_display, XC_bogosity);
  gdk_dnd.c->gdk_cursor_dragok = XCreateFontCursor(gdk_display, XC_heart);
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  XGetKeyboardControl (gdk_display, &keyboard_state);
  autorepeat = keyboard_state.global_auto_repeat;

  timer.tv_sec = 0;
  timer.tv_usec = 0;
  timerp = NULL;

  button_click_time[0] = 0;
  button_click_time[1] = 0;
  button_window[0] = NULL;
  button_window[1] = NULL;
  button_number[0] = -1;
  button_number[1] = -1;

  if (ATEXIT (gdk_exit_func))
    g_warning ("unable to register exit function");

  gdk_visual_init ();
  gdk_window_init ();
  gdk_image_init ();
  gdk_input_init ();

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#ifdef USE_XIM
  /* initialize XIM Protocol variables */
  xim_using = FALSE;
  xim_im = NULL;
  xim_styles = NULL;
  if (!(xim_best_allowed_style & GdkIMPreeditMask))
    gdk_im_set_best_style (GdkIMPreeditCallbacks);
  if (!(xim_best_allowed_style & GdkIMStatusMask))
    gdk_im_set_best_style (GdkIMStatusCallbacks);
  xim_ic = NULL;
  xim_window = (GdkWindow*)NULL;

  gdk_im_open (NULL, NULL, NULL);
#endif

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  initialized = 1;
}

/*
 *--------------------------------------------------------------
 * gdk_exit
 *
 *   Restores the library to an un-itialized state and exits
 *   the program using the "exit" system call.
 *
 * Arguments:
 *   "errorcode" is the error value to pass to "exit".
 *
 * Results:
 *   Allocated structures are freed and the program exits
 *   cleanly.
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

void
gdk_exit (int errorcode)
{
 /* de-initialisation is done by the gdk_exit_funct(),
    no need to do this here (Alex J.) */
 exit (errorcode);
}

/*
 *--------------------------------------------------------------
 * gdk_set_locale
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

gchar*
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gdk_set_locale (void)
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{
  if (!setlocale (LC_ALL,""))
    g_print ("locale not supported by C library\n");

  if (!XSupportsLocale ())
    {
      g_print ("locale not supported by Xlib, locale set to C\n");
      setlocale (LC_ALL, "C");
    }

  if (!XSetLocaleModifiers (""))
    {
      g_print ("can not set locale modifiers\n");
    }

  return setlocale (LC_ALL,NULL);
}

/*
 *--------------------------------------------------------------
 * gdk_events_pending
 *
 *   Returns the number of events pending on the queue.
 *   These events have already been read from the server
 *   connection.
 *
 * Arguments:
 *
 * Results:
 *   Returns the number of events on XLib's event queue.
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

gint
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gdk_events_pending (void)
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{
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  gint result;
  GList *tmp_list;

  result = XPending (gdk_display);

  tmp_list = putback_events;
  while (tmp_list)
    {
      result++;
      tmp_list = tmp_list->next;
    }
  
  return result;
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}

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/*
 *--------------------------------------------------------------
 * gdk_event_get_graphics_expose
 *
 *   Waits for a GraphicsExpose or NoExpose event
 *
 * Arguments:
 *
 * Results: 
 *   For GraphicsExpose events, returns a pointer to the event
 *   converted into a GdkEvent Otherwise, returns NULL.
 *
 * Side effects:
 *
 *-------------------------------------------------------------- */

static Bool
graphics_expose_predicate  (Display  *display,
			    XEvent   *xevent,
			    XPointer  arg)
{
  GdkWindowPrivate *private = (GdkWindowPrivate *)arg;
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  g_return_val_if_fail (private != NULL, False);
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  if ((xevent->xany.window == private->xwindow) &&
      ((xevent->xany.type == GraphicsExpose) ||
       (xevent->xany.type == NoExpose)))
    return True;
  else
    return False;
}

GdkEvent *
gdk_event_get_graphics_expose (GdkWindow *window)
{
  XEvent xevent;
  GdkEvent *event;
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  g_return_val_if_fail (window != NULL, NULL);
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  XIfEvent (gdk_display, &xevent, graphics_expose_predicate, (XPointer)window);

  if (xevent.xany.type == GraphicsExpose)
    {
      event = gdk_event_new ();

      if (gdk_event_translate (event, &xevent))
	return event;
      else
	gdk_event_free (event);
    }
  
  return NULL;  
}

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/*
 *--------------------------------------------------------------
 * gdk_event_get
 *
 *   Gets the next event.
 *
 * Arguments:
 *
 * Results:
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 *   If an event was received that we care about, returns 
 *   a pointer to that event, to be freed with gdk_event_free.
 *   Otherwise, returns NULL. This function will also return
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 *   before an event is received if the timeout interval
 *   runs out.
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

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GdkEvent *
gdk_event_get (void)
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{
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  GdkEvent *event;
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  GList *temp_list;
  XEvent xevent;

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#if 0
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  if (pred)
    {
      temp_list = putback_events;
      while (temp_list)
	{
	  temp_event = temp_list->data;

	  if ((* pred) (temp_event, data))
	    {
	      if (event)
		*event = *temp_event;
	      putback_events = g_list_remove_link (putback_events, temp_list);
	      g_list_free (temp_list);
	      return TRUE;
	    }

	  temp_list = temp_list->next;
	}

      event_pred.func = pred;
      event_pred.data = data;

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      if (XCheckIfEvent (gdk_display, &xevent, gdk_event_get_type, (XPointer) & event_pred))
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	if (event)
	  return gdk_event_translate (event, &xevent);
    }
  else
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#endif
  if (putback_events)
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    {
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      event = putback_events->data;
      
      temp_list = putback_events;
      putback_events = g_list_remove_link (putback_events, temp_list);
      g_list_free_1 (temp_list);
      
      return event;
    }
  
  /* Wait for an event to occur or the timeout to elapse.
   * If an event occurs "gdk_event_wait" will return TRUE.
   *  If the timeout elapses "gdk_event_wait" will return
   *  FALSE.
   */
  if (gdk_event_wait ())
    {
      /* If we get here we can rest assurred that an event
       *  has occurred. Read it.
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       */
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#ifdef USE_XIM
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      gint filter_status;
      if (xim_using && xim_window)
	do
	  {		/* don't dispatch events used by IM */
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	    XNextEvent (gdk_display, &xevent);
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	    filter_status = XFilterEvent (&xevent, 
					  GDK_WINDOW_XWINDOW (xim_window));
	  } while (filter_status == True);
      else
	XNextEvent (gdk_display, &xevent);
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#else
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      XNextEvent (gdk_display, &xevent);
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#endif
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      event = gdk_event_new ();
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      event->any.type = GDK_NOTHING;
      event->any.window = NULL;
      event->any.send_event = FALSE;
      event->any.send_event = xevent.xany.send_event;
      
      if (gdk_event_translate (event, &xevent))
	return event;
      else
	gdk_event_free (event);
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    }

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  return NULL;
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}

void
gdk_event_put (GdkEvent *event)
{
  GdkEvent *new_event;

  g_return_if_fail (event != NULL);

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  new_event = gdk_event_copy (event);
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  putback_events = g_list_prepend (putback_events, new_event);
}

/*
 *--------------------------------------------------------------
 * gdk_event_copy
 *
 *   Copy a event structure into new storage.
 *
 * Arguments:
 *   "event" is the event struct to copy.
 *
 * Results:
 *   A new event structure.  Free it with gdk_event_free.
 *
 * Side effects:
 *   The reference count of the window in the event is increased.
 *
 *--------------------------------------------------------------
 */

static GMemChunk *event_chunk;

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static GdkEvent*
gdk_event_new (void)
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{
  GdkEvent *new_event;
  
  if (event_chunk == NULL)
    event_chunk = g_mem_chunk_new ("events",
				   sizeof (GdkEvent),
				   4096,
				   G_ALLOC_AND_FREE);

  new_event = g_chunk_new (GdkEvent, event_chunk);
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  return new_event;
}

GdkEvent*
gdk_event_copy (GdkEvent *event)
{
  GdkEvent *new_event;
  
  g_return_val_if_fail (event != NULL, NULL);

  new_event = gdk_event_new ();

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  *new_event = *event;
  gdk_window_ref (new_event->any.window);
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  switch (event->any.type)
    {
    case GDK_KEY_PRESS:
    case GDK_KEY_RELEASE:
      new_event->key.string = g_strdup (event->key.string);
      break;

    case GDK_ENTER_NOTIFY:
    case GDK_LEAVE_NOTIFY:
      if (event->crossing.subwindow != NULL)
	gdk_window_ref (event->crossing.subwindow);
      break;

    case GDK_DROP_DATA_AVAIL:
      new_event->dropdataavailable.data_type = g_strdup (event->dropdataavailable.data_type);
      new_event->dropdataavailable.data = g_malloc (event->dropdataavailable.data_numbytes);
      memcpy (new_event->dropdataavailable.data,
	      event->dropdataavailable.data, 
	      event->dropdataavailable.data_numbytes);
      break;
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    default:
      break;
    }
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  return new_event;
}

/*
 *--------------------------------------------------------------
 * gdk_event_free
 *
 *   Free a event structure obtained from gdk_event_copy.  Do not use
 *   with other event structures.
 *
 * Arguments:
 *   "event" is the event struct to free.
 *
 * Results:
 *
 * Side effects:
 *   The reference count of the window in the event is decreased and
 *   might be freed, too.
 *
 *-------------------------------------------------------------- */

void
gdk_event_free (GdkEvent *event)
{
  g_assert (event_chunk != NULL);
  g_return_if_fail (event != NULL);

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  if (event->any.window)
    gdk_window_unref (event->any.window);

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  switch (event->any.type)
    {
    case GDK_KEY_PRESS:
    case GDK_KEY_RELEASE:
      g_free (event->key.string);
      break;

    case GDK_ENTER_NOTIFY:
    case GDK_LEAVE_NOTIFY:
      if (event->crossing.subwindow != NULL)
	gdk_window_unref (event->crossing.subwindow);
      break;

    case GDK_DROP_DATA_AVAIL:
      g_free (event->dropdataavailable.data_type);
      g_free (event->dropdataavailable.data);
      break;

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    case GDK_DRAG_REQUEST:
      g_free (event->dragrequest.data_type);
      break;

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    default:
      break;
    }
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  g_mem_chunk_free (event_chunk, event);
}

/*
 *--------------------------------------------------------------
 * gdk_set_show_events
 *
 *   Turns on/off the showing of events.
 *
 * Arguments:
 *   "show_events" is a boolean describing whether or
 *   not to show the events gdk receives.
 *
 * Results:
 *
 * Side effects:
 *   When "show_events" is TRUE, calls to "gdk_event_get"
 *   will output debugging informatin regarding the event
 *   received to stdout.
 *
 *--------------------------------------------------------------
 */

void
gdk_set_show_events (int show_events)
{
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  if (show_events)
    gdk_debug_flags |= GDK_DEBUG_EVENTS;
  else
    gdk_debug_flags &= ~GDK_DEBUG_EVENTS;
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}

void
gdk_set_use_xshm (gint use_xshm)
{
  gdk_use_xshm = use_xshm;
}

gint
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gdk_get_show_events (void)
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{
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  return gdk_debug_flags & GDK_DEBUG_EVENTS;
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}

gint
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gdk_get_use_xshm (void)
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{
  return gdk_use_xshm;
}

/*
 *--------------------------------------------------------------
 * gdk_time_get
 *
 *   Get the number of milliseconds since the library was
 *   initialized.
 *
 * Arguments:
 *
 * Results:
 *   The time since the library was initialized is returned.
 *   This time value is accurate to milliseconds even though
 *   a more accurate time down to the microsecond could be
 *   returned.
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

guint32
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gdk_time_get (void)
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{
  struct timeval end;
  struct timeval elapsed;
  guint32 milliseconds;

  X_GETTIMEOFDAY (&end);

  if (start.tv_usec > end.tv_usec)
    {
      end.tv_usec += 1000000;
      end.tv_sec--;
    }
  elapsed.tv_sec = end.tv_sec - start.tv_sec;
  elapsed.tv_usec = end.tv_usec - start.tv_usec;

  milliseconds = (elapsed.tv_sec * 1000) + (elapsed.tv_usec / 1000);

  return milliseconds;
}

/*
 *--------------------------------------------------------------
 * gdk_timer_get
 *
 *   Returns the current timer.
 *
 * Arguments:
 *
 * Results:
 *   Returns the current timer interval. This interval is
 *   in units of milliseconds.
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

guint32
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gdk_timer_get (void)
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{
  return timer_val;
}

/*
 *--------------------------------------------------------------
 * gdk_timer_set
 *
 *   Sets the timer interval.
 *
 * Arguments:
 *   "milliseconds" is the new value for the timer.
 *
 * Results:
 *
 * Side effects:
 *   Calls to "gdk_event_get" will last for a maximum
 *   of time of "milliseconds". However, a value of 0
 *   milliseconds will cause "gdk_event_get" to block
 *   indefinately until an event is received.
 *
 *--------------------------------------------------------------
 */

void
gdk_timer_set (guint32 milliseconds)
{
  timer_val = milliseconds;
  timer.tv_sec = milliseconds / 1000;
  timer.tv_usec = (milliseconds % 1000) * 1000;

}

void
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gdk_timer_enable (void)
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{
  timerp = &timer;
}

void
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gdk_timer_disable (void)
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{
  timerp = NULL;
}

gint
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gdk_input_add_full (gint              source,
		    GdkInputCondition condition,
		    GdkInputFunction  function,
		    gpointer          data,
		    GdkDestroyNotify  destroy)
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{
  static gint next_tag = 1;
  GList *list;
  GdkInput *input;
  gint tag;

  tag = 0;
  list = inputs;

  while (list)
    {
      input = list->data;
      list = list->next;

      if ((input->source == source) && (input->condition == condition))
	{
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	  if (input->destroy)
	    (input->destroy) (input->data);
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	  input->function = function;
	  input->data = data;
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	  input->destroy = destroy;
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	  tag = input->tag;
	}
    }

  if (!tag)
    {
      input = g_new (GdkInput, 1);
      input->tag = next_tag++;
      input->source = source;
      input->condition = condition;
      input->function = function;
      input->data = data;
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      input->destroy = destroy;
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      tag = input->tag;

      inputs = g_list_prepend (inputs, input);
    }

  return tag;
}

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gint
gdk_input_add (gint              source,
	       GdkInputCondition condition,
	       GdkInputFunction  function,
	       gpointer          data)
{
  return gdk_input_add_interp (source, condition, function, data, NULL);
}

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void
gdk_input_remove (gint tag)
{
  GList *list;
  GList *temp_list;
  GdkInput *input;

  list = inputs;
  while (list)
    {
      input = list->data;

      if (input->tag == tag)
	{
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	  if (input->destroy)
	    (input->destroy) (input->data);

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	  temp_list = list;

	  if (list->next)
	    list->next->prev = list->prev;
	  if (list->prev)
	    list->prev->next = list->next;
	  if (inputs == list)
	    inputs = list->next;

	  temp_list->next = NULL;
	  temp_list->prev = NULL;

	  g_free (temp_list->data);
	  g_list_free (temp_list);
	  break;
	}

      list = list->next;
    }
}

/*
 *--------------------------------------------------------------
 * gdk_pointer_grab
 *
 *   Grabs the pointer to a specific window
 *
 * Arguments:
 *   "window" is the window which will receive the grab
 *   "owner_events" specifies whether events will be reported as is,
 *     or relative to "window"
 *   "event_mask" masks only interesting events
 *   "confine_to" limits the cursor movement to the specified window
 *   "cursor" changes the cursor for the duration of the grab
 *   "time" specifies the time
 *
 * Results:
 *
 * Side effects:
 *   requires a corresponding call to gdk_pointer_ungrab
 *
 *--------------------------------------------------------------
 */

gint
gdk_pointer_grab (GdkWindow *     window,
		  gint            owner_events,
		  GdkEventMask    event_mask,
		  GdkWindow *     confine_to,
		  GdkCursor *     cursor,
		  guint32         time)
{
  /*  From gdkwindow.c  */
  extern int nevent_masks;
  extern int event_mask_table[];

  gint return_val;
  GdkWindowPrivate *window_private;
  GdkWindowPrivate *confine_to_private;
  GdkCursorPrivate *cursor_private;
  guint xevent_mask;
  Window xwindow;
  Window xconfine_to;
  Cursor xcursor;
  int i;

  g_return_val_if_fail (window != NULL, 0);

  window_private = (GdkWindowPrivate*) window;
  confine_to_private = (GdkWindowPrivate*) confine_to;
  cursor_private = (GdkCursorPrivate*) cursor;

  xwindow = window_private->xwindow;

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  if (!confine_to || confine_to_private->destroyed)
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    xconfine_to = None;
  else
    xconfine_to = confine_to_private->xwindow;

  if (!cursor)
    xcursor = None;
  else
    xcursor = cursor_private->xcursor;


  xevent_mask = 0;
  for (i = 0; i < nevent_masks; i++)
    {
      if (event_mask & (1 << (i + 1)))
	xevent_mask |= event_mask_table[i];
    }

  if (((GdkWindowPrivate *)window)->extension_events &&
      gdk_input_vtable.grab_pointer)
    return_val = gdk_input_vtable.grab_pointer (window,
						owner_events,
						event_mask,
						confine_to,
						time);
  else
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    return_val = Success;
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  if (return_val == Success)
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    {
      if (!window_private->destroyed)
	return_val = XGrabPointer (window_private->xdisplay,
				   xwindow,
				   owner_events,
				   xevent_mask,
				   GrabModeAsync, GrabModeAsync,
				   xconfine_to,
				   xcursor,
				   time);
      else
	return_val = AlreadyGrabbed;
    }

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  if (return_val == GrabSuccess)
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    xgrab_window = window_private;
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  return return_val;
}

/*
 *--------------------------------------------------------------
 * gdk_pointer_ungrab
 *
 *   Releases any pointer grab
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

void
gdk_pointer_ungrab (guint32 time)
{
  if (gdk_input_vtable.ungrab_pointer)
    gdk_input_vtable.ungrab_pointer (time);

  XUngrabPointer (gdk_display, time);
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  xgrab_window = NULL;
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}

/*
 *--------------------------------------------------------------
 * gdk_pointer_is_grabbed
 *
 *   Tell wether there is an active x pointer grab in effect
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

gint
gdk_pointer_is_grabbed (void)
{
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  return xgrab_window != NULL;
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}

/*
 *--------------------------------------------------------------
 * gdk_keyboard_grab
 *
 *   Grabs the keyboard to a specific window
 *
 * Arguments:
 *   "window" is the window which will receive the grab
 *   "owner_events" specifies whether events will be reported as is,
 *     or relative to "window"
 *   "time" specifies the time
 *
 * Results:
 *
 * Side effects:
 *   requires a corresponding call to gdk_keyboard_ungrab
 *
 *--------------------------------------------------------------
 */

gint
gdk_keyboard_grab (GdkWindow *     window,
                   gint            owner_events,
                   guint32         time)
{
  GdkWindowPrivate *window_private;
  Window xwindow;

  g_return_val_if_fail (window != NULL, 0);

  window_private = (GdkWindowPrivate*) window;
  xwindow = window_private->xwindow;

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  if (!window_private->destroyed)
    return XGrabKeyboard (window_private->xdisplay,
			  xwindow,
			  owner_events,
			  GrabModeAsync, GrabModeAsync,
			  time);
  else
    return AlreadyGrabbed;
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}

/*
 *--------------------------------------------------------------
 * gdk_keyboard_ungrab
 *
 *   Releases any keyboard grab
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

void
gdk_keyboard_ungrab (guint32 time)
{
  XUngrabKeyboard (gdk_display, time);
}

/*
 *--------------------------------------------------------------
 * gdk_screen_width
 *
 *   Return the width of the screen.
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

gint
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gdk_screen_width (void)
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{
  gint return_val;

  return_val = DisplayWidth (gdk_display, gdk_screen);

  return return_val;
}

/*
 *--------------------------------------------------------------
 * gdk_screen_height
 *
 *   Return the height of the screen.
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

gint
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gdk_screen_height (void)
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{
  gint return_val;

  return_val = DisplayHeight (gdk_display, gdk_screen);

  return return_val;
}

void
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gdk_key_repeat_disable (void)
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{
  XAutoRepeatOff (gdk_display);
}

void
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gdk_key_repeat_restore (void)
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{
  if (autorepeat)
    XAutoRepeatOn (gdk_display);
  else
    XAutoRepeatOff (gdk_display);
}


/*
 *--------------------------------------------------------------
 * gdk_flush
 *
 *   Flushes the Xlib output buffer and then waits
 *   until all requests have been received and processed
 *   by the X server. The only real use for this function
 *   is in dealing with XShm.
 *
 * Arguments:
 *
 * Results:
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

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void gdk_flush (void)
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{
  XSync (gdk_display, False);
}


void
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gdk_beep (void)
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{
  XBell(gdk_display, 100);
}


/*
 *--------------------------------------------------------------
 * gdk_event_wait
 *
 *   Waits until an event occurs or the timer runs out.
 *
 * Arguments:
 *
 * Results:
 *   Returns TRUE if an event is ready to be read and FALSE
 *   if the timer ran out.
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

static gint
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gdk_event_wait (void)
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{
  GList *list;
  GdkInput *input;
  GdkInputCondition condition;
  SELECT_MASK readfds;
  SELECT_MASK writefds;
  SELECT_MASK exceptfds;
  int max_input;
  int nfd;

  /* If there are no events pending we will wait for an event.
   * The time we wait is dependant on the "timer". If no timer
   *  has been specified then we'll block until an event arrives.
   *  If a timer has been specified we'll block until an event
   *  arrives or the timer expires. (This is all done using the
   *  "select" system call).
   */

  if (XPending (gdk_display) == 0)
    {
      FD_ZERO (&readfds);
      FD_ZERO (&writefds);
      FD_ZERO (&exceptfds);

      FD_SET (connection_number, &readfds);
      max_input = connection_number;

      list = inputs;
      while (list)
	{
	  input = list->data;
	  list = list->next;

	  if (input->condition & GDK_INPUT_READ)
	    FD_SET (input->source, &readfds);
	  if (input->condition & GDK_INPUT_WRITE)
	    FD_SET (input->source, &writefds);
	  if (input->condition & GDK_INPUT_EXCEPTION)
	    FD_SET (input->source, &exceptfds);

	  max_input = MAX (max_input, input->source);
	}

      nfd = select (max_input+1, &readfds, &writefds, &exceptfds, timerp);

      timerp = NULL;
      timer_val = 0;

      if (nfd > 0)
	{
	  if (FD_ISSET (connection_number, &readfds))
	    {
	      if (XPending (gdk_display) == 0)
		{
		  if (nfd == 1)
		    {
		      XNoOp (gdk_display);
		      XFlush (gdk_display);
		    }
		  return FALSE;
		}
	      else
		return TRUE;
	    }

	  list = inputs;
	  while (list)
	    {
	      input = list->data;
	      list = list->next;

	      condition = 0;
	      if (FD_ISSET (input->source, &readfds))
		condition |= GDK_INPUT_READ;
	      if (FD_ISSET (input->source, &writefds))
		condition |= GDK_INPUT_WRITE;
	      if (FD_ISSET (input->source, &exceptfds))
		condition |= GDK_INPUT_EXCEPTION;

	      if (condition && input->function)
		(* input->function) (input->data, input->source, condition);
	    }
	}
    }
  else
    return TRUE;

  return FALSE;
}

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static gint
gdk_event_apply_filters (XEvent *xevent,
			 GdkEvent *event,
			 GList *filters)
{
  GdkEventFilter *filter;
  GList *tmp_list;
  GdkFilterReturn result;

  tmp_list = filters;
  
  while (tmp_list)
    {
      filter = (GdkEventFilter *)tmp_list->data;

      result = (*filter->function)(xevent, event, filter->data);
      if (result !=  GDK_FILTER_CONTINUE)
	return result;
	
      tmp_list = tmp_list->next;
    }

  return GDK_FILTER_CONTINUE;
}

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static gint
gdk_event_translate (GdkEvent *event,
		     XEvent   *xevent)
{

  GdkWindow *window;
  GdkWindowPrivate *window_private;
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  static XComposeStatus compose;
  KeySym keysym;
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  int charcount;
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#ifdef USE_XIM
  static gchar* buf = NULL;
  static gint buf_len= 0;
#else
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  char buf[16];
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#endif
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  gint return_val;

  return_val = FALSE;

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  /* We need to play catch-up with the dnd motion events */
  if(gdk_dnd.drag_really && xevent->type == MotionNotify)
	while (XCheckTypedEvent(xevent->xany.display,MotionNotify,xevent));

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  /* Find the GdkWindow that this event occurred in.
   * All events occur in some GdkWindow (otherwise, why
   *  would we be receiving them). It really is an error
   *  to receive an event for which we cannot find the
   *  corresponding GdkWindow. We handle events with window=None
   *  specially - they are generated by XFree86's XInput under
   *  some circumstances.
   */

  if ((xevent->xany.window == None) &&
      gdk_input_vtable.window_none_event)
    {
      return_val = gdk_input_vtable.window_none_event (event,xevent);

      if (return_val >= 0)	/* was handled */
	return return_val;
      else
	return_val = FALSE;
    }

  window = gdk_window_lookup (xevent->xany.window);
  window_private = (GdkWindowPrivate *) window;

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  if (window != NULL)
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    gdk_window_ref (window);
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  else if(gdk_null_window_warnings) /* Special purpose programs that
				       get events for other windows may
				       want to disable this */
    g_warning ("%#lx -> NULL\n", xevent->xany.window);
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  /* Check for filters for this window */

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  {
    GdkFilterReturn result;
    result = gdk_event_apply_filters (xevent, event,
				      window_private
				      ?window_private->filters
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				      :gdk_default_filters);
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    if (result != GDK_FILTER_CONTINUE)
      {
	return (result == GDK_FILTER_TRANSLATE) ? TRUE : FALSE;
      }
  }
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  /* We do a "manual" conversion of the XEvent to a
   *  GdkEvent. The structures are mostly the same so
   *  the conversion is fairly straightforward. We also
   *  optionally print debugging info regarding events
   *  received.
   */
  /* Addendum:
   * During drag & drop you get events where the pointer is
   * in other windows. Need to just do finer-grained checking
   */
  switch (xevent->type)
    {
    case KeyPress:
      /* Lookup the string corresponding to the given keysym.
       */
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#ifdef USE_XIM
      if (buf_len == 0) 
        {
	  buf_len = 128;