gtkimcontextxim.c 35.9 KB
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/* GTK - The GIMP Toolkit
 * Copyright (C) 2000 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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.
 */

#include "locale.h"
#include <string.h>

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#include "gtk/gtkintl.h"
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#include "gtk/gtklabel.h"
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#include "gtk/gtksignal.h"
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#include "gtk/gtkwindow.h"
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#include "gtkimcontextxim.h"

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typedef struct _StatusWindow StatusWindow;

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struct _GtkXIMInfo
{
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  GdkScreen *screen;
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  XIM im;
  char *locale;
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  XIMStyle preedit_style_setting;
  XIMStyle status_style_setting;
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  XIMStyle style;
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  GtkSettings *settings;
  gulong status_set;
  gulong preedit_set;
  XIMStyles *xim_styles;
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  GSList *ics;
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};

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/* A context status window; these are kept in the status_windows list. */
struct _StatusWindow
{
  GtkWidget *window;
  
  /* Toplevel window to which the status window corresponds */
  GtkWidget *toplevel;
  
  /* Signal connection ids; we connect to the toplevel */
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  gulong destroy_handler_id;
  gulong configure_handler_id;
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};

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static void     gtk_im_context_xim_class_init         (GtkIMContextXIMClass  *class);
static void     gtk_im_context_xim_init               (GtkIMContextXIM       *im_context_xim);
static void     gtk_im_context_xim_finalize           (GObject               *obj);
static void     gtk_im_context_xim_set_client_window  (GtkIMContext          *context,
						       GdkWindow             *client_window);
static gboolean gtk_im_context_xim_filter_keypress    (GtkIMContext          *context,
						       GdkEventKey           *key);
static void     gtk_im_context_xim_reset              (GtkIMContext          *context);
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static void     gtk_im_context_xim_focus_in           (GtkIMContext          *context);
static void     gtk_im_context_xim_focus_out          (GtkIMContext          *context);
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static void     gtk_im_context_xim_set_cursor_location (GtkIMContext          *context,
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						       GdkRectangle		*area);
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static void     gtk_im_context_xim_set_use_preedit    (GtkIMContext          *context,
						       gboolean		      use_preedit);
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static void     gtk_im_context_xim_get_preedit_string (GtkIMContext          *context,
						       gchar                **str,
						       PangoAttrList        **attrs,
						       gint                  *cursor_pos);

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static void reinitialize_ic      (GtkIMContextXIM *context_xim,
				  gboolean         send_signal);
static void set_ic_client_window (GtkIMContextXIM *context_xim,
				  GdkWindow       *client_window,
				  gboolean         send_signal);

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static void setup_styles (GtkXIMInfo *info);

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static void status_window_show     (GtkIMContextXIM *context_xim);
static void status_window_hide     (GtkIMContextXIM *context_xim);
static void status_window_set_text (GtkIMContextXIM *context_xim,
				    const gchar     *text);

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static XIC       gtk_im_context_xim_get_ic            (GtkIMContextXIM *context_xim);
static GObjectClass *parent_class;

GType gtk_type_im_context_xim = 0;

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GSList *open_ims = NULL;
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/* List of status windows for different toplevels */
static GSList *status_windows = NULL;

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void
gtk_im_context_xim_register_type (GTypeModule *type_module)
{
  static const GTypeInfo im_context_xim_info =
  {
    sizeof (GtkIMContextXIMClass),
    (GBaseInitFunc) NULL,
    (GBaseFinalizeFunc) NULL,
    (GClassInitFunc) gtk_im_context_xim_class_init,
    NULL,           /* class_finalize */    
    NULL,           /* class_data */
    sizeof (GtkIMContextXIM),
    0,
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    (GInstanceInitFunc) gtk_im_context_xim_init,
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  };

  gtk_type_im_context_xim = 
    g_type_module_register_type (type_module,
				 GTK_TYPE_IM_CONTEXT,
				 "GtkIMContextXIM",
				 &im_context_xim_info, 0);
}

#define PREEDIT_MASK (XIMPreeditCallbacks | XIMPreeditPosition | \
		      XIMPreeditArea | XIMPreeditNothing | XIMPreeditNone)
#define STATUS_MASK (XIMStatusCallbacks | XIMStatusArea | \
		      XIMStatusNothing | XIMStatusNone)
#define ALLOWED_MASK (XIMPreeditCallbacks | XIMPreeditNothing | XIMPreeditNone | \
		      XIMStatusCallbacks | XIMStatusNothing | XIMStatusNone)

static XIMStyle 
choose_better_style (XIMStyle style1, XIMStyle style2) 
{
  XIMStyle s1, s2, u; 
  
  if (style1 == 0) return style2;
  if (style2 == 0) return style1;
  if ((style1 & (PREEDIT_MASK | STATUS_MASK))
    	== (style2 & (PREEDIT_MASK | STATUS_MASK)))
    return style1;

  s1 = style1 & PREEDIT_MASK;
  s2 = style2 & PREEDIT_MASK;
  u = s1 | s2;
  if (s1 != s2) {
    if (u & XIMPreeditCallbacks)
      return (s1 == XIMPreeditCallbacks) ? style1 : style2;
    else if (u & XIMPreeditPosition)
      return (s1 == XIMPreeditPosition) ? style1 :style2;
    else if (u & XIMPreeditArea)
      return (s1 == XIMPreeditArea) ? style1 : style2;
    else if (u & XIMPreeditNothing)
      return (s1 == XIMPreeditNothing) ? style1 : style2;
  } else {
    s1 = style1 & STATUS_MASK;
    s2 = style2 & STATUS_MASK;
    u = s1 | s2;
    if (u & XIMStatusCallbacks)
      return (s1 == XIMStatusCallbacks) ? style1 : style2;
    else if (u & XIMStatusArea)
      return (s1 == XIMStatusArea) ? style1 : style2;
    else if (u & XIMStatusNothing)
      return (s1 == XIMStatusNothing) ? style1 : style2;
    else if (u & XIMStatusNone)
      return (s1 == XIMStatusNone) ? style1 : style2;
  }
  return 0; /* Get rid of stupid warning */
}

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static void
reinitialize_all_ics (GtkXIMInfo *info)
{
  GSList *tmp_list;

  for (tmp_list = info->ics; tmp_list; tmp_list = tmp_list->next)
    reinitialize_ic (tmp_list->data, TRUE);
}

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static void
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status_style_change (GtkXIMInfo *info)
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{
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  GtkIMStatusStyle status_style;
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  g_object_get (info->settings,
		"gtk-im-status-style", &status_style,
		NULL);
  if (status_style == GTK_IM_STATUS_CALLBACK)
    info->status_style_setting = XIMStatusCallbacks;
  else if (status_style == GTK_IM_STATUS_NOTHING)
    info->status_style_setting = XIMStatusNothing;
  else
    return;
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  setup_styles (info);
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  reinitialize_all_ics (info);
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}
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static void
preedit_style_change (GtkXIMInfo *info)
{
  GtkIMPreeditStyle preedit_style;
  g_object_get (info->settings,
		"gtk-im-preedit-style", &preedit_style,
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		NULL);
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  if (preedit_style == GTK_IM_PREEDIT_CALLBACK)
    info->preedit_style_setting = XIMPreeditCallbacks;
  else if (preedit_style == GTK_IM_PREEDIT_NOTHING)
    info->preedit_style_setting = XIMPreeditNothing;
  else
    return;

  setup_styles (info);
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  reinitialize_all_ics (info);
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}
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static void
setup_styles (GtkXIMInfo *info)
{
  int i;
  unsigned long settings_preference;
  XIMStyles *xim_styles = info->xim_styles;

  settings_preference = info->status_style_setting|info->preedit_style_setting;
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  if (xim_styles)
    {
      for (i = 0; i < xim_styles->count_styles; i++)
	if ((xim_styles->supported_styles[i] & ALLOWED_MASK) == xim_styles->supported_styles[i])
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	  {
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	    if (settings_preference == xim_styles->supported_styles[i])
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	      {
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		info->style = settings_preference;
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		break;
	      }
	    info->style = choose_better_style (info->style,
					       xim_styles->supported_styles[i]);
	  }
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    }
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}

static void
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setup_im (GtkXIMInfo *info)
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{
  XIMValuesList *ic_values = NULL;

  XGetIMValues (info->im,
		XNQueryInputStyle, &info->xim_styles,
		XNQueryICValuesList, &ic_values,
		NULL);
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  info->settings = gtk_settings_get_for_screen (info->screen);
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  if (!g_object_class_find_property (G_OBJECT_GET_CLASS (info->settings),
				     "gtk-im-preedit-style"))
    gtk_settings_install_property (g_param_spec_enum ("gtk-im-preedit-style",
						      _("IM Preedit style"),
						      _("How to draw the input method preedit string"),
						      GTK_TYPE_IM_PREEDIT_STYLE,
						      GTK_IM_PREEDIT_CALLBACK,
						      G_PARAM_READWRITE));

  if (!g_object_class_find_property (G_OBJECT_GET_CLASS (info->settings),
				     "gtk-im-status-style"))
    gtk_settings_install_property (g_param_spec_enum ("gtk-im-status-style",
						      _("IM Status style"),
						      _("How to draw the input method statusbar"),
						      GTK_TYPE_IM_STATUS_STYLE,
						      GTK_IM_STATUS_CALLBACK,
						      G_PARAM_READWRITE));
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  info->status_set = g_signal_connect_swapped (info->settings,
					       "notify::gtk-im-status-style",
					       G_CALLBACK (status_style_change),
					       info);
  info->preedit_set = g_signal_connect_swapped (info->settings,
						"notify::gtk-im-preedit-style",
						G_CALLBACK (preedit_style_change),
						info);

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  status_style_change (info);
  preedit_style_change (info);
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#if 0
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  if (ic_values)
    {
      for (i = 0; i < ic_values->count_values; i++)
	g_print ("%s\n", ic_values->supported_values[i]);
      for (i = 0; i < xim_styles->count_styles; i++)
	g_print ("%#x\n", xim_styles->supported_styles[i]);
    }
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#endif

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  if (ic_values)
    XFree (ic_values);
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}

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static void
xim_info_display_closed (GdkDisplay *display,
			 gboolean    is_error,
			 GtkXIMInfo *info)
{
  GSList *ics, *tmp_list;

  open_ims = g_slist_remove (open_ims, info);

  ics = info->ics;
  info->ics = NULL;

  for (tmp_list = ics; tmp_list; tmp_list = tmp_list->next)
    set_ic_client_window (tmp_list->data, NULL, TRUE);

  g_slist_free (tmp_list);
  
  g_signal_handler_disconnect (info->settings, info->status_set);
  g_signal_handler_disconnect (info->settings, info->preedit_set);
  
  XFree (info->xim_styles->supported_styles);
  XFree (info->xim_styles);
  g_free (info->locale);
  XCloseIM (info->im);

  g_free (info);
}

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static GtkXIMInfo *
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get_im (GdkWindow *client_window,
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	const char *locale)
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{
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  GSList *tmp_list;
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  GtkXIMInfo *info;
  XIM im = NULL;
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  GdkScreen *screen = gdk_drawable_get_screen (client_window);
  GdkDisplay *display = gdk_screen_get_display (screen);
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  tmp_list = open_ims;
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  while (tmp_list)
    {
      info = tmp_list->data;
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      if (info->screen == screen &&
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	  strcmp (info->locale, locale) == 0)
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	return info;

      tmp_list = tmp_list->next;
    }

  info = NULL;

  if (XSupportsLocale ())
    {
      if (!XSetLocaleModifiers (""))
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	g_warning ("Unable to set locale modifiers with XSetLocaleModifiers()");
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      im = XOpenIM (GDK_DISPLAY_XDISPLAY (display), NULL, NULL, NULL);
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      if (!im)
	g_warning ("Unable to open XIM input method, falling back to XLookupString()");

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      if (im)
	{
	  info = g_new (GtkXIMInfo, 1);
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	  open_ims = g_slist_prepend (open_ims, info);
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	  info->screen = screen;
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	  info->locale = g_strdup (locale);
	  info->im = im;
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	  info->xim_styles = NULL;
	  info->preedit_style_setting = 0;
	  info->status_style_setting = 0;
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	  info->settings = NULL;
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	  info->preedit_set = 0;
	  info->status_set = 0;

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	  setup_im (info);

	  g_signal_connect_swapped (display, "closed",
				    G_CALLBACK (xim_info_display_closed), info);
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	}
    }

  return info;
}

static void
gtk_im_context_xim_class_init (GtkIMContextXIMClass *class)
{
  GtkIMContextClass *im_context_class = GTK_IM_CONTEXT_CLASS (class);
  GObjectClass *gobject_class = G_OBJECT_CLASS (class);

  parent_class = g_type_class_peek_parent (class);

  im_context_class->set_client_window = gtk_im_context_xim_set_client_window;
  im_context_class->filter_keypress = gtk_im_context_xim_filter_keypress;
  im_context_class->reset = gtk_im_context_xim_reset;
  im_context_class->get_preedit_string = gtk_im_context_xim_get_preedit_string;
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  im_context_class->focus_in = gtk_im_context_xim_focus_in;
  im_context_class->focus_out = gtk_im_context_xim_focus_out;
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  im_context_class->set_cursor_location = gtk_im_context_xim_set_cursor_location;
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  im_context_class->set_use_preedit = gtk_im_context_xim_set_use_preedit;
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  gobject_class->finalize = gtk_im_context_xim_finalize;
}

static void
gtk_im_context_xim_init (GtkIMContextXIM *im_context_xim)
{
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  im_context_xim->use_preedit = TRUE;
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  im_context_xim->filter_key_release = FALSE;
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}

static void
gtk_im_context_xim_finalize (GObject *obj)
{
  GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (obj);

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  set_ic_client_window (context_xim, NULL, FALSE);
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  g_free (context_xim->locale);
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  g_free (context_xim->mb_charset);
}

static void
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reinitialize_ic (GtkIMContextXIM *context_xim,
		 gboolean         send_signal)
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{
  if (context_xim->ic)
    {
      XDestroyIC (context_xim->ic);
      context_xim->ic = NULL;
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      if (context_xim->preedit_length)
	{
	  context_xim->preedit_length = 0;
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	  if (send_signal)
	    g_signal_emit_by_name (context_xim, "preedit_changed");
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	}
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    }
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}

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static void
set_ic_client_window (GtkIMContextXIM *context_xim,
		      GdkWindow       *client_window,
		      gboolean         send_signal)
{
  reinitialize_ic (context_xim, send_signal);
  if (context_xim->client_window)
    {
      context_xim->im_info->ics = g_slist_remove (context_xim->im_info->ics, context_xim);
      context_xim->im_info = NULL;
    }
  
  context_xim->client_window = client_window;

  if (context_xim->client_window)
    {
      context_xim->im_info = get_im (context_xim->client_window, context_xim->locale);
      context_xim->im_info->ics = g_slist_prepend (context_xim->im_info->ics, context_xim);
    }
}

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static void
gtk_im_context_xim_set_client_window (GtkIMContext          *context,
				      GdkWindow             *client_window)
{
  GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
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  set_ic_client_window (context_xim, client_window, TRUE);
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}

GtkIMContext *
gtk_im_context_xim_new (void)
{
  GtkIMContextXIM *result;
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  const gchar *charset;
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  result = GTK_IM_CONTEXT_XIM (g_object_new (GTK_TYPE_IM_CONTEXT_XIM, NULL));
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  result->locale = g_strdup (setlocale (LC_CTYPE, NULL));
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  g_get_charset (&charset);
  result->mb_charset = g_strdup (charset);

  return GTK_IM_CONTEXT (result);
}

static char *
mb_to_utf8 (GtkIMContextXIM *context_xim,
	    const char      *str)
{
  GError *error = NULL;
  gchar *result;

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  if (strcmp (context_xim->mb_charset, "UTF-8") == 0)
    result = g_strdup (str);
  else
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    {
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      result = g_convert (str, -1,
			  "UTF-8", context_xim->mb_charset,
			  NULL, NULL, &error);
      if (!result)
	{
	  g_warning ("Error converting text from IM to UTF-8: %s\n", error->message);
	  g_error_free (error);
	}
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    }
  
  return result;
}

static gboolean
gtk_im_context_xim_filter_keypress (GtkIMContext *context,
				    GdkEventKey  *event)
{
  GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
  XIC ic = gtk_im_context_xim_get_ic (context_xim);
  gchar static_buffer[256];
  gchar *buffer = static_buffer;
  gint buffer_size = sizeof(static_buffer) - 1;
  gint num_bytes = 0;
  KeySym keysym;
  Status status;
  gboolean result = FALSE;
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  GdkWindow *root_window = gdk_screen_get_root_window (gdk_drawable_get_screen (event->window));
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  XKeyPressedEvent xevent;

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  if (event->type == GDK_KEY_RELEASE && !context_xim->filter_key_release)
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    return FALSE;

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  xevent.type = (event->type == GDK_KEY_PRESS) ? KeyPress : KeyRelease;
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  xevent.serial = 0;		/* hope it doesn't matter */
  xevent.send_event = event->send_event;
  xevent.display = GDK_DRAWABLE_XDISPLAY (event->window);
  xevent.window = GDK_DRAWABLE_XID (event->window);
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  xevent.root = GDK_DRAWABLE_XID (root_window);
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  xevent.subwindow = xevent.window;
  xevent.time = event->time;
  xevent.x = xevent.x_root = 0;
  xevent.y = xevent.y_root = 0;
  xevent.state = event->state;
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  xevent.keycode = event->hardware_keycode;
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  xevent.same_screen = True;
  
  if (XFilterEvent ((XEvent *)&xevent, GDK_DRAWABLE_XID (context_xim->client_window)))
    return TRUE;
  
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  if (ic)
    num_bytes = XmbLookupString (ic, &xevent, buffer, buffer_size, &keysym, &status);
  else
    {
      num_bytes = XLookupString (&xevent, buffer, buffer_size, &keysym, NULL);
      status = XLookupBoth;
    }
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  if (status == XBufferOverflow)
    {
      buffer_size = num_bytes;
      buffer = g_malloc (num_bytes + 1);
      goto again;
    }

  /* I don't know how we should properly handle XLookupKeysym or XLookupBoth
   * here ... do input methods actually change the keysym? we can't really
   * feed it back to accelerator processing at this point...
   */
  if (status == XLookupChars || status == XLookupBoth)
    {
      char *result_utf8;

      buffer[num_bytes] = '\0';

      result_utf8 = mb_to_utf8 (context_xim, buffer);
      if (result_utf8)
	{
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	  if ((guchar)result_utf8[0] >= 0x20 &&
	      result_utf8[0] != 0x7f) /* Some IM have a nasty habit of converting
				       * control characters into strings
				       */
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	    {
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	      g_signal_emit_by_name (context, "commit", result_utf8);
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	      result = TRUE;
	    }
	  
	  g_free (result_utf8);
	}
    }

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  return result;
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}

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static void
gtk_im_context_xim_focus_in (GtkIMContext *context)
{
  GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
  XIC ic = gtk_im_context_xim_get_ic (context_xim);

  if (!ic)
    return;

  XSetICFocus (ic);
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  status_window_show (context_xim);

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  return;
}

static void
gtk_im_context_xim_focus_out (GtkIMContext *context)
{
  GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
  XIC ic = gtk_im_context_xim_get_ic (context_xim);

  if (!ic)
    return;

  XUnsetICFocus (ic);
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  status_window_hide (context_xim);

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  return;
}

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static void
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gtk_im_context_xim_set_cursor_location (GtkIMContext *context,
					GdkRectangle *area)
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{
  GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
  XIC ic = gtk_im_context_xim_get_ic (context_xim);

  XVaNestedList preedit_attr;
  XPoint          spot;

  if (!ic)
    return;

  spot.x = area->x;
  spot.y = area->y;

  preedit_attr = XVaCreateNestedList (0,
				      XNSpotLocation, &spot,
				      0);
  XSetICValues (ic,
		XNPreeditAttributes, preedit_attr,
		NULL);
  XFree(preedit_attr);

  return;
}

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static void
gtk_im_context_xim_set_use_preedit (GtkIMContext *context,
				    gboolean      use_preedit)
{
  GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);

  use_preedit = use_preedit != FALSE;

  if (context_xim->use_preedit != use_preedit)
    {
      context_xim->use_preedit = use_preedit;
661
      reinitialize_ic (context_xim, TRUE);
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    }

  return;
}

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static void
gtk_im_context_xim_reset (GtkIMContext *context)
{
  GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
  XIC ic = gtk_im_context_xim_get_ic (context_xim);
  gchar *result;

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  /* restore conversion state after resetting ic later */
  XIMPreeditState preedit_state = XIMPreeditUnKnown;
  XVaNestedList preedit_attr;
  gboolean have_preedit_state = FALSE;

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  if (!ic)
    return;
  
682

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  if (context_xim->preedit_length == 0)
    return;

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  preedit_attr = XVaCreateNestedList(0,
                                     XNPreeditState, &preedit_state,
                                     0);
  if (!XGetICValues(ic,
                    XNPreeditAttributes, preedit_attr,
                    NULL))
    have_preedit_state = TRUE;

  XFree(preedit_attr);

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  result = XmbResetIC (ic);

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  preedit_attr = XVaCreateNestedList(0,
                                     XNPreeditState, preedit_state,
                                     0);
  if (have_preedit_state)
    XSetICValues(ic,
		 XNPreeditAttributes, preedit_attr,
		 NULL);

  XFree(preedit_attr);

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  if (result)
    {
      char *result_utf8 = mb_to_utf8 (context_xim, result);
      if (result_utf8)
	{
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	  g_signal_emit_by_name (context, "commit", result_utf8);
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	  g_free (result_utf8);
	}
    }

  if (context_xim->preedit_length)
    {
      context_xim->preedit_length = 0;
721
      g_signal_emit_by_name (context, "preedit_changed");
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    }

  XFree (result);
}

/* Mask of feedback bits that we render
 */
#define FEEDBACK_MASK (XIMReverse | XIMUnderline)

static void
add_feedback_attr (PangoAttrList *attrs,
		   const gchar   *str,
		   XIMFeedback    feedback,
		   gint           start_pos,
		   gint           end_pos)
{
  PangoAttribute *attr;
  
  gint start_index = g_utf8_offset_to_pointer (str, start_pos) - str;
  gint end_index = g_utf8_offset_to_pointer (str, end_pos) - str;

  if (feedback & XIMUnderline)
    {
      attr = pango_attr_underline_new (PANGO_UNDERLINE_SINGLE);
      attr->start_index = start_index;
      attr->end_index = end_index;

      pango_attr_list_change (attrs, attr);
    }

  if (feedback & XIMReverse)
    {
      attr = pango_attr_foreground_new (0xffff, 0xffff, 0xffff);
      attr->start_index = start_index;
      attr->end_index = end_index;

      pango_attr_list_change (attrs, attr);

      attr = pango_attr_background_new (0, 0, 0);
      attr->start_index = start_index;
      attr->end_index = end_index;

      pango_attr_list_change (attrs, attr);
    }

  if (feedback & ~FEEDBACK_MASK)
    g_warning ("Unrendered feedback style: %#lx", feedback & ~FEEDBACK_MASK);
}

static void     
gtk_im_context_xim_get_preedit_string (GtkIMContext   *context,
				       gchar         **str,
				       PangoAttrList **attrs,
				       gint           *cursor_pos)
{
  GtkIMContextXIM *context_xim = GTK_IM_CONTEXT_XIM (context);
778
  gchar *utf8 = g_ucs4_to_utf8 (context_xim->preedit_chars, context_xim->preedit_length, NULL, NULL, NULL);
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  if (attrs)
    {
      int i;
      XIMFeedback last_feedback = 0;
      gint start = -1;
      
      *attrs = pango_attr_list_new ();

      for (i = 0; i < context_xim->preedit_length; i++)
	{
	  XIMFeedback new_feedback = context_xim->feedbacks[i] & FEEDBACK_MASK;
	  if (new_feedback != last_feedback)
	    {
	      if (start >= 0)
		add_feedback_attr (*attrs, utf8, last_feedback, start, i);
	      
	      last_feedback = new_feedback;
	      start = i;
	    }
	}

      if (start >= 0)
	add_feedback_attr (*attrs, utf8, last_feedback, start, i);
    }

  if (str)
    *str = utf8;
  else
    g_free (utf8);

  if (cursor_pos)
    *cursor_pos = context_xim->preedit_cursor;
}

static void
preedit_start_callback (XIC      xic,
			XPointer client_data,
			XPointer call_data)
{
  GtkIMContext *context = GTK_IM_CONTEXT (client_data);
  
821
  g_signal_emit_by_name (context, "preedit_start");
822 823 824 825 826 827 828 829 830
}		     

static void
preedit_done_callback (XIC      xic,
		     XPointer client_data,
		     XPointer call_data)
{
  GtkIMContext *context = GTK_IM_CONTEXT (client_data);
  
831
  g_signal_emit_by_name (context, "preedit_end");  
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}		     

static gint
xim_text_to_utf8 (GtkIMContextXIM *context, XIMText *xim_text, gchar **text)
{
  gint text_length = 0;
  GError *error = NULL;
  gchar *result = NULL;

  if (xim_text && xim_text->string.multi_byte)
    {
      if (xim_text->encoding_is_wchar)
	{
	  g_warning ("Wide character return from Xlib not currently supported");
	  *text = NULL;
	  return 0;
	}

850 851 852 853 854 855 856 857
      if (strcmp (context->mb_charset, "UTF-8") == 0)
	result = g_strdup (xim_text->string.multi_byte);
      else
	result = g_convert (xim_text->string.multi_byte,
			    -1,
			    "UTF-8",
			    context->mb_charset,
			    NULL, NULL, &error);
858 859 860 861 862 863 864 865 866 867 868 869 870 871
      
      if (result)
	{
	  text_length = g_utf8_strlen (result, -1);
	  
	  if (text_length != xim_text->length)
	    {
	      g_warning ("Size mismatch when converting text from input method: supplied length = %d\n, result length = %d", xim_text->length, text_length);
	    }
	}
      else
	{
	  g_warning ("Error converting text from IM to UCS-4: %s", error->message);
	  g_error_free (error);
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	  *text = NULL;
	  return 0;
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	}

      *text = result;
      return text_length;
    }
  else
    {
      *text = NULL;
      return 0;
    }
}

static void
preedit_draw_callback (XIC                           xic, 
		       XPointer                      client_data,
		       XIMPreeditDrawCallbackStruct *call_data)
{
  GtkIMContextXIM *context = GTK_IM_CONTEXT_XIM (client_data);

  XIMText *new_xim_text = call_data->text;
  gint new_text_length;
  gunichar *new_text = NULL;
  gint i;
  gint diff;
  gint new_length;
  gchar *tmp;
  
  gint chg_first = CLAMP (call_data->chg_first, 0, context->preedit_length);
  gint chg_length = CLAMP (call_data->chg_length, 0, context->preedit_length - chg_first);

  context->preedit_cursor = call_data->caret;
  
  if (chg_first != call_data->chg_first || chg_length != call_data->chg_length)
    g_warning ("Invalid change to preedit string, first=%d length=%d (orig length == %d)",
	       call_data->chg_first, call_data->chg_length, context->preedit_length);

  new_text_length = xim_text_to_utf8 (context, new_xim_text, &tmp);
  if (tmp)
    {
914
      new_text = g_utf8_to_ucs4_fast (tmp, -1, NULL);
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      g_free (tmp);
    }
  
  diff = new_text_length - chg_length;
  new_length = context->preedit_length + diff;

  if (new_length > context->preedit_size)
    {
      context->preedit_size = new_length;
      context->preedit_chars = g_renew (gunichar, context->preedit_chars, new_length);
      context->feedbacks = g_renew (XIMFeedback, context->feedbacks, new_length);
    }

  if (diff < 0)
    {
      for (i = chg_first + chg_length ; i < context->preedit_length; i++)
	{
	  context->preedit_chars[i + diff] = context->preedit_chars[i];
	  context->feedbacks[i + diff] = context->feedbacks[i];
	}
    }
  else
    {
      for (i = context->preedit_length - 1; i >= chg_first + chg_length ; i--)
	{
	  context->preedit_chars[i + diff] = context->preedit_chars[i];
	  context->feedbacks[i + diff] = context->feedbacks[i];
	}
    }

  for (i = 0; i < new_text_length; i++)
    {
      context->preedit_chars[chg_first + i] = new_text[i];
      context->feedbacks[chg_first + i] = new_xim_text->feedback[i];
    }

  context->preedit_length += diff;

  if (new_text)
    g_free (new_text);

956
  g_signal_emit_by_name (context, "preedit_changed");
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}
    

static void
preedit_caret_callback (XIC                            xic,
			XPointer                       client_data,
			XIMPreeditCaretCallbackStruct *call_data)
{
  GtkIMContextXIM *context = GTK_IM_CONTEXT_XIM (client_data);
  
  if (call_data->direction == XIMAbsolutePosition)
    {
      context->preedit_cursor = call_data->position;
970
      g_signal_emit_by_name (context, "preedit_changed");
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    }
  else
    {
      g_warning ("Caret movement command: %d %d %d not supported",
		 call_data->position, call_data->direction, call_data->style);
    }
}	     

static void
status_start_callback (XIC      xic,
		       XPointer client_data,
		       XPointer call_data)
{
984
  return;
985 986 987 988 989 990 991
} 

static void
status_done_callback (XIC      xic,
		      XPointer client_data,
		      XPointer call_data)
{
992
  return;
993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
}

static void
status_draw_callback (XIC      xic,
		      XPointer client_data,
		      XIMStatusDrawCallbackStruct *call_data)
{
  GtkIMContextXIM *context = GTK_IM_CONTEXT_XIM (client_data);

  if (call_data->type == XIMTextType)
    {
      gchar *text;
      xim_text_to_utf8 (context, call_data->data.text, &text);

      if (text)
1008 1009 1010
	status_window_set_text (context, text);
      else
	status_window_set_text (context, "");
1011 1012 1013
    }
  else				/* bitmap */
    {
1014
      g_print ("Status drawn with bitmap - id = %#lx\n", call_data->data.bitmap);
1015 1016 1017
    }
}

1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
static XVaNestedList
set_preedit_callback (GtkIMContextXIM *context_xim)
{
  context_xim->preedit_start_callback.client_data = (XPointer)context_xim;
  context_xim->preedit_start_callback.callback = (XIMProc)preedit_start_callback;
  context_xim->preedit_done_callback.client_data = (XPointer)context_xim;
  context_xim->preedit_done_callback.callback = (XIMProc)preedit_done_callback;
  context_xim->preedit_draw_callback.client_data = (XPointer)context_xim;
  context_xim->preedit_draw_callback.callback = (XIMProc)preedit_draw_callback;
  context_xim->preedit_caret_callback.client_data = (XPointer)context_xim;
  context_xim->preedit_caret_callback.callback = (XIMProc)preedit_caret_callback;
  return XVaCreateNestedList (0,
			      XNPreeditStartCallback, &context_xim->preedit_start_callback,
			      XNPreeditDoneCallback, &context_xim->preedit_done_callback,
			      XNPreeditDrawCallback, &context_xim->preedit_draw_callback,
			      XNPreeditCaretCallback, &context_xim->preedit_caret_callback,
			      NULL);
}

static XVaNestedList
set_status_callback (GtkIMContextXIM *context_xim)
{
  context_xim->status_start_callback.client_data = (XPointer)context_xim;
  context_xim->status_start_callback.callback = (XIMProc)status_start_callback;
  context_xim->status_done_callback.client_data = (XPointer)context_xim;
  context_xim->status_done_callback.callback = (XIMProc)status_done_callback;
  context_xim->status_draw_callback.client_data = (XPointer)context_xim;
  context_xim->status_draw_callback.callback = (XIMProc)status_draw_callback;
	  
  return XVaCreateNestedList (0,
			      XNStatusStartCallback, &context_xim->status_start_callback,
			      XNStatusDoneCallback, &context_xim->status_done_callback,
			      XNStatusDrawCallback, &context_xim->status_draw_callback,
			      NULL);
}

1054
static XIC
1055
get_ic_real (GtkIMContextXIM *context_xim)
1056
{
1057
  XIC xic = 0;
1058
  const char *name1 = NULL;
1059
  XVaNestedList list1 = NULL;
1060
  const char *name2 = NULL;
1061
  XVaNestedList list2 = NULL;
1062
  XIMStyle im_style = 0;
1063

1064 1065
  if (context_xim->use_preedit &&
      (context_xim->im_info->style & PREEDIT_MASK) == XIMPreeditCallbacks)
1066
    {
1067
      im_style |= XIMPreeditCallbacks;
1068
      name1 = XNPreeditAttributes;
1069
      list1 = set_preedit_callback (context_xim);
1070
    }
1071 1072
  else
    im_style |= XIMPreeditNothing;
1073 1074 1075

  if ((context_xim->im_info->style & STATUS_MASK) == XIMStatusCallbacks)
    {
1076
      im_style |= XIMStatusCallbacks;
1077
      if (name1 == NULL)
1078
	{
1079
	  name1 = XNStatusAttributes;
1080
	  list1 = set_status_callback (context_xim);
1081
	}
1082
      else
1083
	{
1084
	  name2 = XNStatusAttributes;
1085
	  list2 = set_status_callback (context_xim);
1086
	}
1087
    }
1088 1089
  else
    im_style |= XIMStatusNothing;
1090

1091
  xic = XCreateIC (context_xim->im_info->im,
1092
		   XNInputStyle, im_style,
1093 1094 1095 1096 1097 1098 1099 1100 1101
		   XNClientWindow, GDK_DRAWABLE_XID (context_xim->client_window),
		   name1, list1,
		   name2, list2,
		   NULL);
  if (list1)
    XFree (list1);
  if (list2)
    XFree (list2);

1102 1103 1104 1105 1106 1107 1108 1109 1110
  if (xic)
    {
      /* Don't filter key released events with XFilterEvents unless
       * input methods ask for. This is a workaround for Solaris input
       * method bug in C and European locales. It doubles each key
       * stroke if both key pressed and released events are filtered.
       * (bugzilla #81759)
       */
      gulong mask = 0;
1111
      XGetICValues (xic,
1112
		    XNFilterEvents, &mask,
1113
		    NULL);
1114 1115 1116 1117
      context_xim->filter_key_release = (mask & KeyReleaseMask);
    }

  return xic;
1118 1119 1120 1121 1122 1123
}

static XIC
gtk_im_context_xim_get_ic (GtkIMContextXIM *context_xim)
{
  if (!context_xim->ic && context_xim->im_info)
1124 1125
    context_xim->ic = get_ic_real (context_xim);
  
1126 1127
  return context_xim->ic;
}
1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163

/**************************
 *                        *
 * Status Window handling *
 *                        *
 **************************/

static gboolean
status_window_expose_event (GtkWidget      *widget,
			    GdkEventExpose *event)
{
  gdk_draw_rectangle (widget->window,
		      widget->style->base_gc [GTK_STATE_NORMAL],
		      TRUE,
		      0, 0,
		      widget->allocation.width, widget->allocation.height);
  gdk_draw_rectangle (widget->window,
		      widget->style->text_gc [GTK_STATE_NORMAL],
		      FALSE,
		      0, 0,
		      widget->allocation.width - 1, widget->allocation.height - 1);

  return FALSE;
}

static void
status_window_style_set (GtkWidget *toplevel,
			 GtkStyle  *previous_style,
			 GtkWidget *label)
{
  gint i;
  
  for (i = 0; i < 5; i++)
    gtk_widget_modify_fg (label, i, &toplevel->style->text[i]);
}

1164
/* Frees a status window and removes its link from the status_windows list */
1165
static void
1166
status_window_free (StatusWindow *status_window)
1167
{
1168 1169 1170 1171 1172 1173 1174 1175
  status_windows = g_slist_remove (status_windows, status_window);
 
  g_signal_handler_disconnect (status_window->toplevel, status_window->destroy_handler_id);
  g_signal_handler_disconnect (status_window->toplevel, status_window->configure_handler_id);
  gtk_widget_destroy (status_window->window);
  g_object_set_data (G_OBJECT (status_window->toplevel), "gtk-im-xim-status-window", NULL);
 
  g_free (status_window);
1176 1177 1178 1179 1180
}

static gboolean
status_window_configure (GtkWidget         *toplevel,
			 GdkEventConfigure *event,
1181
  			 StatusWindow      *status_window)
1182 1183 1184 1185
{
  GdkRectangle rect;
  GtkRequisition requisition;
  gint y;
1186 1187
  gint height = gdk_screen_get_height (gtk_widget_get_screen (toplevel));
  
1188
  gdk_window_get_frame_extents (toplevel->window, &rect);
1189
  gtk_widget_size_request (status_window->window, &requisition);
1190

1191
  if (rect.y + rect.height + requisition.height < height)
1192 1193
    y = rect.y + rect.height;
  else
1194
    y = height - requisition.height;
1195
  
1196
  gtk_window_move (GTK_WINDOW (status_window->window), rect.x, y);
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206

  return FALSE;
}

static GtkWidget *
status_window_get (GtkIMContextXIM *context_xim,
		   gboolean         create)
{
  GdkWindow *toplevel_gdk;
  GtkWidget *toplevel;
1207 1208
  GtkWidget *window;
  StatusWindow *status_window;
1209
  GtkWidget *status_label;
1210 1211
  GdkScreen *screen;
  GdkWindow *root_window;
1212 1213 1214 1215 1216
  
  if (!context_xim->client_window)
    return NULL;

  toplevel_gdk = context_xim->client_window;
1217 1218 1219
  screen = gdk_drawable_get_screen (toplevel_gdk);
  root_window = gdk_screen_get_root_window (screen);
  
1220 1221 1222
  while (TRUE)
    {
      GdkWindow *parent = gdk_window_get_parent (toplevel_gdk);
1223
      if (parent == root_window)
1224 1225 <