gdkevents-win32.c 79.7 KB
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/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 * Copyright (C) 1998-1999 Tor Lillqvist
 *
 * 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
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include "config.h"

#include <stdio.h>
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#include <gdk/gdk.h>
#include <gdk/gdkkeysyms.h>
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#include "gdkx.h"
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#ifdef HAVE_WINTAB
#include <wintab.h>
#endif
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#include "gdkinput.h"

#define PING() printf("%s: %d\n",__FILE__,__LINE__),fflush(stdout)

typedef struct _GdkIOClosure GdkIOClosure;
typedef struct _GdkEventPrivate GdkEventPrivate;

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

typedef enum
{
  /* Following flag is set for events on the event queue during
   * translation and cleared afterwards.
   */
  GDK_EVENT_PENDING = 1 << 0
} GdkEventFlags;

struct _GdkIOClosure
{
  GdkInputFunction function;
  GdkInputCondition condition;
  GdkDestroyNotify notify;
  gpointer data;
};

struct _GdkEventPrivate
{
  GdkEvent event;
  guint    flags;
};

/* 
 * Private function declarations
 */

static GdkEvent *gdk_event_new		(void);
static gint	 gdk_event_apply_filters(MSG      *xevent,
					 GdkEvent *event,
					 GList    *filters);
static gint	 gdk_event_translate	(GdkEvent *event, 
					 MSG      *xevent,
					 gboolean *ret_val_flagp,
					 gint     *ret_valp);
static void      gdk_events_queue       (void);
static GdkEvent *gdk_event_unqueue      (void);
static gboolean  gdk_event_prepare      (gpointer  source_data, 
				 	 GTimeVal *current_time,
					 gint     *timeout);
static gboolean  gdk_event_check        (gpointer  source_data,
				 	 GTimeVal *current_time);
static gboolean  gdk_event_dispatch     (gpointer  source_data,
					 GTimeVal *current_time,
					 gpointer  user_data);

static void	 gdk_synthesize_click	(GdkEvent     *event, 
					 gint	       nclicks);

/* Private variable declarations
 */

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.
					     */
static GdkWindowPrivate *p_grab_window = NULL; /* Window that currently
						* holds the pointer grab
						*/

static GdkWindowPrivate *k_grab_window = NULL; /* Window the holds the
						* keyboard grab
						*/

static GList *client_filters;	/* Filters for client messages */

static gboolean p_grab_automatic;
static GdkEventMask p_grab_event_mask;
static gboolean p_grab_owner_events, k_grab_owner_events;
static HCURSOR p_grab_cursor;

static GdkEventFunc   event_func = NULL;    /* Callback for events */
static gpointer       event_data = NULL;
static GDestroyNotify event_notify = NULL;

static GList *client_filters;	            /* Filters for client messages */

/* FIFO's for event queue, and for events put back using
 * gdk_event_put().
 */
static GList *queued_events = NULL;
static GList *queued_tail = NULL;

static GSourceFuncs event_funcs = {
  gdk_event_prepare,
  gdk_event_check,
  gdk_event_dispatch,
  (GDestroyNotify)g_free
};

GPollFD event_poll_fd;

static GdkWindow *curWnd = NULL;
static HWND active = NULL;
static gint curX, curY;
static gdouble curXroot, curYroot;
static UINT gdk_ping_msg;
static gboolean ignore_WM_CHAR = FALSE;
static gboolean is_AltGr_key = FALSE;

LRESULT CALLBACK 
gdk_WindowProc(HWND hwnd,
	       UINT message,
	       WPARAM wParam,
	       LPARAM lParam)
{
  GdkEvent event;
  GdkEvent *eventp;
  MSG msg;
  DWORD pos;
  gint ret_val;
  gboolean ret_val_flag;

  GDK_NOTE (EVENTS, g_print ("gdk_WindowProc: %#x\n", message));

  msg.hwnd = hwnd;
  msg.message = message;
  msg.wParam = wParam;
  msg.lParam = lParam;
  msg.time = GetTickCount ();
  pos = GetMessagePos ();
  msg.pt.x = LOWORD (pos);
  msg.pt.y = HIWORD (pos);

  if (gdk_event_translate (&event, &msg, &ret_val_flag, &ret_val))
    {
#if 1
      /* Compress configure events */
      if (event.any.type == GDK_CONFIGURE)
	{
	  GList *list = queued_events;

	  while (list != NULL
		 && (((GdkEvent *)list->data)->any.type != GDK_CONFIGURE
		     || ((GdkEvent *)list->data)->any.window != event.any.window))
	    list = list->next;
	  if (list != NULL)
	    {
	      *((GdkEvent *)list->data) = event;
	      gdk_window_unref (event.any.window);
	      /* Wake up WaitMessage */
	      PostMessage (NULL, gdk_ping_msg, 0, 0);
	      return FALSE;
	    }
	}
#endif
      eventp = gdk_event_new ();
      *eventp = event;

      gdk_event_queue_append (eventp);
#if 1
      /* Wake up WaitMessage */
      PostMessage (NULL, gdk_ping_msg, 0, 0);
#endif
      if (ret_val_flag)
	return ret_val;
      else
	return FALSE;
    }

  if (ret_val_flag)
    return ret_val;
  else
    return DefWindowProc (hwnd, message, wParam, lParam);
}

/*********************************************
 * Functions for maintaining the event queue *
 *********************************************/

/*************************************************************
 * gdk_event_queue_find_first:
 *     Find the first event on the queue that is not still
 *     being filled in.
 *   arguments:
 *     
 *   results:
 *     Pointer to the list node for that event, or NULL
 *************************************************************/

static GList*
gdk_event_queue_find_first (void)
{
  GList *tmp_list = queued_events;

  while (tmp_list)
    {
      GdkEventPrivate *event = tmp_list->data;
      if (!(event->flags & GDK_EVENT_PENDING))
	return tmp_list;

      tmp_list = g_list_next (tmp_list);
    }

  return NULL;
}

/*************************************************************
 * gdk_event_queue_remove_link:
 *     Remove a specified list node from the event queue.
 *   arguments:
 *     node: Node to remove.
 *   results:
 *************************************************************/

static void
gdk_event_queue_remove_link (GList *node)
{
  if (node->prev)
    node->prev->next = node->next;
  else
    queued_events = node->next;
  
  if (node->next)
    node->next->prev = node->prev;
  else
    queued_tail = node->prev;
  
}

/*************************************************************
 * gdk_event_queue_append:
 *     Append an event onto the tail of the event queue.
 *   arguments:
 *     event: Event to append.
 *   results:
 *************************************************************/

void
gdk_event_queue_append (GdkEvent *event)
{
  queued_tail = g_list_append (queued_tail, event);
  
  if (!queued_events)
    queued_events = queued_tail;
  else
    queued_tail = queued_tail->next;
}

void 
gdk_events_init (void)
{
  if (g_pipe_readable_msg == 0)
    g_pipe_readable_msg = RegisterWindowMessage ("g-pipe-readable");

  g_source_add (GDK_PRIORITY_EVENTS, TRUE, &event_funcs, NULL, NULL, NULL);

  event_poll_fd.fd = G_WIN32_MSG_HANDLE;
  event_poll_fd.events = G_IO_IN;
  
  g_main_add_poll (&event_poll_fd, GDK_PRIORITY_EVENTS);

  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;

  gdk_ping_msg = RegisterWindowMessage ("gdk-ping");
}

/*
 *--------------------------------------------------------------
 * gdk_events_pending
 *
 *   Returns if events are pending on the queue.
 *
 * Arguments:
 *
 * Results:
 *   Returns TRUE if events are pending
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

gboolean
gdk_events_pending (void)
{
  MSG msg;

  return (gdk_event_queue_find_first() || PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE));
}

/*
 *--------------------------------------------------------------
 * 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:
 *
 *-------------------------------------------------------------- */

GdkEvent*
gdk_event_get_graphics_expose (GdkWindow *window)
{
  MSG xevent;
  GdkEvent *event;
  GdkWindowPrivate *private = (GdkWindowPrivate *) window;

  g_return_val_if_fail (window != NULL, NULL);
  
  GDK_NOTE (EVENTS, g_print ("gdk_event_get_graphics_expose\n"));

#if 1
  /* Some nasty bugs here, just return NULL for now. */
  return NULL;
#else
  if (GetMessage (&xevent, private->xwindow, WM_PAINT, WM_PAINT))
    {
      event = gdk_event_new ();
      
      if (gdk_event_translate (event, &xevent, NULL, NULL))
	return event;
      else
	gdk_event_free (event);
    }
  
  return NULL;	
#endif
}

/************************
 * Exposure compression *
 ************************/

/* I don't bother with exposure compression on Win32. Windows compresses
 * WM_PAINT events by itself.
 */

/*************************************************************
 * gdk_event_handler_set:
 *     
 *   arguments:
 *     func: Callback function to be called for each event.
 *     data: Data supplied to the function
 *     notify: function called when function is no longer needed
 * 
 *   results:
 *************************************************************/

void 
gdk_event_handler_set (GdkEventFunc   func,
		       gpointer       data,
		       GDestroyNotify notify)
{
  if (event_notify)
    (*event_notify) (event_data);

  event_func = func;
  event_data = data;
  event_notify = notify;
}

/*
 *--------------------------------------------------------------
 * gdk_event_get
 *
 *   Gets the next event.
 *
 * Arguments:
 *
 * Results:
 *   If an event is waiting that we care about, returns 
 *   a pointer to that event, to be freed with gdk_event_free.
 *   Otherwise, returns NULL.
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

GdkEvent*
gdk_event_get (void)
{
  gdk_events_queue();

  return gdk_event_unqueue();
}

/*
 *--------------------------------------------------------------
 * gdk_event_peek
 *
 *   Gets the next event.
 *
 * Arguments:
 *
 * Results:
 *   If an event is waiting that we care about, returns 
 *   a copy of that event, but does not remove it from
 *   the queue. The pointer is to be freed with gdk_event_free.
 *   Otherwise, returns NULL.
 *
 * Side effects:
 *
 *--------------------------------------------------------------
 */

GdkEvent*
gdk_event_peek (void)
{
  GList *tmp_list;

  tmp_list = gdk_event_queue_find_first ();
  
  if (tmp_list)
    return gdk_event_copy (tmp_list->data);
  else
    return NULL;
}

void
gdk_event_put (GdkEvent *event)
{
  GdkEvent *new_event;
  GList *tmp_list;
  
  g_return_if_fail (event != NULL);
  
  new_event = gdk_event_copy (event);

  gdk_event_queue_append (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 = NULL;

static GdkEvent*
gdk_event_new (void)
{
  GdkEventPrivate *new_event;
  
  if (event_chunk == NULL)
    event_chunk = g_mem_chunk_new ("events",
				   sizeof (GdkEventPrivate),
				   4096,
				   G_ALLOC_AND_FREE);
  
  new_event = g_chunk_new (GdkEventPrivate, event_chunk);
  new_event->flags = 0;
  
  return (GdkEvent *) new_event;
}

GdkEvent*
gdk_event_copy (GdkEvent *event)
{
  GdkEvent *new_event;
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  gchar *s;
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  g_return_val_if_fail (event != NULL, NULL);
  
  new_event = gdk_event_new ();
  
  *new_event = *event;
  gdk_window_ref (new_event->any.window);
  
  switch (event->any.type)
    {
    case GDK_KEY_PRESS:
    case GDK_KEY_RELEASE:
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      if (event->key.length > 0)
	{
	  s = event->key.string;
	  new_event->key.string = g_malloc (event->key.length + 1);
	  memcpy (new_event->key.string, s, event->key.length + 1);
	}
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      break;
      
    case GDK_ENTER_NOTIFY:
    case GDK_LEAVE_NOTIFY:
      if (event->crossing.subwindow != NULL)
	gdk_window_ref (event->crossing.subwindow);
      break;
      
    case GDK_DRAG_ENTER:
    case GDK_DRAG_LEAVE:
    case GDK_DRAG_MOTION:
    case GDK_DRAG_STATUS:
    case GDK_DROP_START:
    case GDK_DROP_FINISHED:
      gdk_drag_context_ref (event->dnd.context);
      break;
      
    default:
      break;
    }
  
  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_return_if_fail (event != NULL);

  g_assert (event_chunk != NULL); /* paranoid */
  
  if (event->any.window)
    gdk_window_unref (event->any.window);
  
  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_DRAG_ENTER:
    case GDK_DRAG_LEAVE:
    case GDK_DRAG_MOTION:
    case GDK_DRAG_STATUS:
    case GDK_DROP_START:
    case GDK_DROP_FINISHED:
      gdk_drag_context_unref (event->dnd.context);
      break;
      
    default:
      break;
    }
  
  g_mem_chunk_free (event_chunk, event);
}

/*
 *--------------------------------------------------------------
 * gdk_event_get_time:
 *    Get the timestamp from an event.
 *   arguments:
 *     event:
 *   results:
 *    The event's time stamp, if it has one, otherwise
 *    GDK_CURRENT_TIME.
 *--------------------------------------------------------------
 */

guint32
gdk_event_get_time (GdkEvent *event)
{
  if (event)
    switch (event->type)
      {
      case GDK_MOTION_NOTIFY:
	return event->motion.time;
      case GDK_BUTTON_PRESS:
      case GDK_2BUTTON_PRESS:
      case GDK_3BUTTON_PRESS:
      case GDK_BUTTON_RELEASE:
	return event->button.time;
      case GDK_KEY_PRESS:
      case GDK_KEY_RELEASE:
	return event->key.time;
      case GDK_ENTER_NOTIFY:
      case GDK_LEAVE_NOTIFY:
	return event->crossing.time;
      case GDK_PROPERTY_NOTIFY:
	return event->property.time;
      case GDK_SELECTION_CLEAR:
      case GDK_SELECTION_REQUEST:
      case GDK_SELECTION_NOTIFY:
	return event->selection.time;
      case GDK_PROXIMITY_IN:
      case GDK_PROXIMITY_OUT:
	return event->proximity.time;
      case GDK_DRAG_ENTER:
      case GDK_DRAG_LEAVE:
      case GDK_DRAG_MOTION:
      case GDK_DRAG_STATUS:
      case GDK_DROP_START:
      case GDK_DROP_FINISHED:
	return event->dnd.time;
      default:			/* use current time */
	break;
      }
  
  return GDK_CURRENT_TIME;
}

/*
 *--------------------------------------------------------------
 * 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 (gint show_events)
{
  if (show_events)
    gdk_debug_flags |= GDK_DEBUG_EVENTS;
  else
    gdk_debug_flags &= ~GDK_DEBUG_EVENTS;
}

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

/*
 *--------------------------------------------------------------
 * 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)
{
  GdkWindowPrivate *window_private;
  HWND xwindow;
  HWND xconfine_to;
  HCURSOR xcursor;
  GdkWindowPrivate *confine_to_private;
  GdkCursorPrivate *cursor_private;
  gint return_val;

  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;
  
  if (!confine_to || confine_to_private->destroyed)
    xconfine_to = NULL;
  else
    xconfine_to = confine_to_private->xwindow;
  
  if (!cursor)
    xcursor = NULL;
  else
    xcursor = cursor_private->xcursor;
  
  if (gdk_input_vtable.grab_pointer)
    return_val = gdk_input_vtable.grab_pointer (window,
						owner_events,
						event_mask,
						confine_to,
						time);
  else
    return_val = Success;
  
  if (return_val == Success)
    {
      if (!window_private->destroyed)
      {
	GDK_NOTE (EVENTS, g_print ("gdk_pointer_grab: %#x %s %#x\n",
				   xwindow,
				   (owner_events ? "TRUE" : "FALSE"),
				   xcursor));
	p_grab_event_mask = event_mask;
	p_grab_owner_events = owner_events != 0;
	p_grab_automatic = FALSE;

#if 0 /* Menus don't work if we use mouse capture. Pity, because many other
       * things work better with mouse capture.
       */
	SetCapture (xwindow);
#endif
	return_val = GrabSuccess;
      }
      else
	return_val = AlreadyGrabbed;
    }
  
  if (return_val == GrabSuccess)
    {
      p_grab_window = window_private;
      p_grab_cursor = xcursor;
    }
  
  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);
#if 0
  if (GetCapture () != NULL)
    ReleaseCapture ();
#endif
  GDK_NOTE (EVENTS, g_print ("gdk_pointer_ungrab\n"));

  p_grab_window = NULL;
}

/*
 *--------------------------------------------------------------
 * 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)
{
  return p_grab_window != NULL;
}

/*
 *--------------------------------------------------------------
 * 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;
  gint return_val;
  
  g_return_val_if_fail (window != NULL, 0);
  
  window_private = (GdkWindowPrivate*) window;
  
  GDK_NOTE (EVENTS, g_print ("gdk_keyboard_grab %#x\n",
			     window_private->xwindow));

  if (!window_private->destroyed)
    {
      k_grab_owner_events = owner_events != 0;
      return_val = GrabSuccess;
    }
  else
    return_val = AlreadyGrabbed;

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

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

void
gdk_keyboard_ungrab (guint32 time)
{
  GDK_NOTE (EVENTS, g_print ("gdk_keyboard_ungrab\n"));

  k_grab_window = NULL;
}

static void
gdk_io_destroy (gpointer data)
{
  GdkIOClosure *closure = data;

  if (closure->notify)
    closure->notify (closure->data);

  g_free (closure);
}

static gboolean  
gdk_io_invoke (GIOChannel   *source,
	       GIOCondition  condition,
	       gpointer      data)
{
  GdkIOClosure *closure = data;
  GdkInputCondition gdk_cond = 0;

  if (condition & (G_IO_IN | G_IO_PRI))
    gdk_cond |= GDK_INPUT_READ;
  if (condition & G_IO_OUT)
    gdk_cond |= GDK_INPUT_WRITE;
  if (condition & (G_IO_ERR | G_IO_HUP | G_IO_NVAL))
    gdk_cond |= GDK_INPUT_EXCEPTION;

  if (closure->condition & gdk_cond)
    closure->function (closure->data, g_io_channel_unix_get_fd (source), gdk_cond);

  return TRUE;
}

gint
gdk_input_add_full (gint	      source,
		    GdkInputCondition condition,
		    GdkInputFunction  function,
		    gpointer	      data,
		    GdkDestroyNotify  destroy)
{
  guint result;
  GdkIOClosure *closure = g_new (GdkIOClosure, 1);
  GIOChannel *channel;
  GIOCondition cond = 0;

  closure->function = function;
  closure->condition = condition;
  closure->notify = destroy;
  closure->data = data;

  if (condition & GDK_INPUT_READ)
    cond |= (G_IO_IN | G_IO_PRI);
  if (condition & GDK_INPUT_WRITE)
    cond |= G_IO_OUT;
  if (condition & GDK_INPUT_EXCEPTION)
    cond |= G_IO_ERR|G_IO_HUP|G_IO_NVAL;

  channel = g_io_channel_unix_new (source);
  result = g_io_add_watch_full (channel, G_PRIORITY_DEFAULT, cond,
				gdk_io_invoke,
				closure, gdk_io_destroy);
  g_io_channel_unref (channel);

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