gtkimcontextxim.c 35.5 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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  GdkDisplay *display;
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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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};

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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);
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,
    (GtkObjectInitFunc) gtk_im_context_xim_init,
  };

  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 */
}

static void
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status_style_change (GtkXIMInfo *info)
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{
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  GtkIMStatusStyle status_style;
  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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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);
}

static void
status_style_change_notify (GtkIMContextXIM *context_xim)
{
  GtkXIMInfo *info = context_xim->im_info;
  status_style_change (info);

  reinitialize_ic (context_xim);
}

static void
preedit_style_change_notify (GtkIMContextXIM *context_xim)
{
  GtkXIMInfo *info = context_xim->im_info;
  preedit_style_change (info);

  reinitialize_ic (context_xim);
}
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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
setup_im (GtkXIMInfo *info, GdkWindow *window)
{
  XIMValuesList *ic_values = NULL;
  int i;
  GdkScreen *screen = gdk_drawable_get_screen (window);

  XGetIMValues (info->im,
		XNQueryInputStyle, &info->xim_styles,
		XNQueryICValuesList, &ic_values,
		NULL);
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  info->settings = gtk_settings_get_for_screen (screen);

  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));
  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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}

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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  GdkDisplay *display = gdk_drawable_get_display (client_window);
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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->display == display &&
	  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);
	  open_ims = g_slist_prepend (open_ims, im);
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	  info->display = display;
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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;
	  info->settings = 0;
	  info->preedit_set = 0;
	  info->status_set = 0;

	  setup_im (info, client_window);
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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;
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}

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);

  if (context_xim->ic)
    {
      XDestroyIC (context_xim->ic);
      context_xim->ic = NULL;
    }
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  if (context_xim->im_info)
    {
      GtkXIMInfo *info = context_xim->im_info;
      XFree (info->xim_styles->supported_styles);
      XFree (info->xim_styles);
      g_free (info->locale);
      g_signal_handler_disconnect (info->settings, info->status_set);
      g_signal_handler_disconnect (info->settings, info->preedit_set);
      XCloseIM (info->im);
    }

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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)
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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;
	  g_signal_emit_by_name (context_xim, "preedit_changed");
	}
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    }
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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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  reinitialize_ic (context_xim);
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  context_xim->client_window = client_window;
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  if (context_xim->client_window)
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    context_xim->im_info = get_im (context_xim->client_window, context_xim->locale);
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  else
    context_xim->im_info = NULL;
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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;
  
 again:
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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;
      reinitialize_ic (context_xim);
    }

  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;
  
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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;
677
      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);
734
  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);
  
777
  g_signal_emit_by_name (context, "preedit_start");
778 779 780 781 782 783 784 785 786
}		     

static void
preedit_done_callback (XIC      xic,
		     XPointer client_data,
		     XPointer call_data)
{
  GtkIMContext *context = GTK_IM_CONTEXT (client_data);
  
787
  g_signal_emit_by_name (context, "preedit_end");  
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
}		     

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;
	}

806 807 808 809 810 811 812 813
      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);
814 815 816 817 818 819 820 821 822 823 824 825 826 827
      
      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);
828 829 830

	  *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)
    {
870
      new_text = g_utf8_to_ucs4_fast (tmp, -1, NULL);
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911
      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);

912
  g_signal_emit_by_name (context, "preedit_changed");
913 914 915 916 917 918 919 920 921 922 923 924 925
}
    

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;
926
      g_signal_emit_by_name (context, "preedit_changed");
927 928 929 930 931 932 933 934 935 936 937 938 939
    }
  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)
{
940
  return;
941 942 943 944 945 946 947
} 

static void
status_done_callback (XIC      xic,
		      XPointer client_data,
		      XPointer call_data)
{
948
  return;
949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
}

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)
964 965 966
	status_window_set_text (context, text);
      else
	status_window_set_text (context, "");
967 968 969
    }
  else				/* bitmap */
    {
970
      g_print ("Status drawn with bitmap - id = %#lx\n", call_data->data.bitmap);
971 972 973
    }
}

974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
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);
}

1010
static XIC
1011
get_ic_real (GtkIMContextXIM *context_xim)
1012
{
1013
  XIC xic = 0;
1014
  const char *name1 = NULL;
1015
  XVaNestedList list1 = NULL;
1016
  const char *name2 = NULL;
1017
  XVaNestedList list2 = NULL;
1018
  XIMStyle im_style = 0;
1019

1020 1021
  if (context_xim->use_preedit &&
      (context_xim->im_info->style & PREEDIT_MASK) == XIMPreeditCallbacks)
1022
    {
1023
      im_style |= XIMPreeditCallbacks;
1024
      name1 = XNPreeditAttributes;
1025
      list1 = set_preedit_callback (context_xim);
1026
    }
1027 1028
  else
    im_style |= XIMPreeditNothing;
1029 1030 1031

  if ((context_xim->im_info->style & STATUS_MASK) == XIMStatusCallbacks)
    {
1032
      im_style |= XIMStatusCallbacks;
1033
      if (name1 == NULL)
1034
	{
1035
	  name1 = XNStatusAttributes;
1036
	  list1 = set_status_callback (context_xim);
1037
	}
1038
      else
1039
	{
1040
	  name2 = XNStatusAttributes;
1041
	  list2 = set_status_callback (context_xim);
1042
	}
1043
    }
1044 1045
  else
    im_style |= XIMStatusNothing;
1046

1047
  xic = XCreateIC (context_xim->im_info->im,
1048
		   XNInputStyle, im_style,
1049 1050 1051 1052 1053 1054 1055 1056 1057
		   XNClientWindow, GDK_DRAWABLE_XID (context_xim->client_window),
		   name1, list1,
		   name2, list2,
		   NULL);
  if (list1)
    XFree (list1);
  if (list2)
    XFree (list2);

1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
  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;
      XGetICValues (context_xim->ic,
		    XNFilterEvents, &mask,
1069
		    NULL);
1070 1071 1072 1073
      context_xim->filter_key_release = (mask & KeyReleaseMask);
    }

  return xic;
1074 1075 1076 1077 1078 1079 1080
}

static XIC
gtk_im_context_xim_get_ic (GtkIMContextXIM *context_xim)
{
  if (!context_xim->ic && context_xim->im_info)
    {
1081
      context_xim->ic = get_ic_real (context_xim);
1082

1083 1084 1085 1086 1087
      /* 
       * connect property-notify signal handlers to respond runtime
       * changes of status_style and preedit_style in the settings
       */
      if (context_xim->im_info->settings)
1088
	{
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102
	  GtkXIMInfo *info = context_xim->im_info;
	  if (info->status_set)
	    g_signal_handler_disconnect (info->settings, info->status_set);
	  if (info->preedit_set)
	    g_signal_handler_disconnect (info->settings, info->preedit_set);

	  info->status_set = g_signal_connect_swapped (info->settings,
						       "notify::gtk-im-status-style",
						       G_CALLBACK (status_style_change_notify),
						       context_xim);
	  info->preedit_set = g_signal_connect_swapped (info->settings,
							"notify::gtk-im-preedit-style",
							G_CALLBACK (preedit_style_change_notify),
							context_xim);
1103 1104 1105 1106
	}
    }
  return context_xim->ic;
}
1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142

/**************************
 *                        *
 * 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]);
}

1143
/* Frees a status window and removes its link from the status_windows list */
1144
static void
1145
status_window_free (StatusWindow *status_window)
1146
{
1147 1148 1149 1150 1151 1152 1153 1154
  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);
1155 1156 1157 1158 1159
}

static gboolean
status_window_configure (GtkWidget         *toplevel,
			 GdkEventConfigure *event,
1160
  			 StatusWindow      *status_window)
1161 1162 1163 1164
{
  GdkRectangle rect;
  GtkRequisition requisition;
  gint y;
1165 1166
  gint height = gdk_screen_get_height (gtk_widget_get_screen (toplevel));
  
1167
  gdk_window_get_frame_extents (toplevel->window, &rect);
1168
  gtk_widget_size_request (status_window->window, &requisition);
1169

1170
  if (rect.y + rect.height + requisition.height < height)
1171 1172
    y = rect.y + rect.height;
  else
1173
    y = height - requisition.height;
1174
  
1175
  gtk_window_move (GTK_WINDOW (status_window->window), rect.x, y);
1176 1177 1178 1179 1180 1181 1182 1183 1184 1185

  return FALSE;
}

static GtkWidget *
status_window_get (GtkIMContextXIM *context_xim,
		   gboolean         create)
{
  GdkWindow *toplevel_gdk;
  GtkWidget *toplevel;
1186 1187
  GtkWidget *window;
  StatusWindow *status_window;
1188
  GtkWidget *status_label;
1189 1190
  GdkScreen *screen;
  GdkWindow *root_window;
1191 1192 1193 1194 1195
  
  if (!context_xim->client_window)
    return NULL;

  toplevel_gdk = context_xim->client_window;
1196 1197 1198
  screen = gdk_drawable_get_screen (toplevel_gdk);
  root_window = gdk_screen_get_root_window (screen);
  
1199 1200 1201
  while (TRUE)
    {
      GdkWindow *parent = gdk_window_get_parent (toplevel_gdk);
1202
      if (parent == root_window)
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
	break;
      else
	toplevel_gdk = parent;
    }

  gdk_window_get_user_data (toplevel_gdk, (gpointer *)&toplevel);
  if (!toplevel)
    return NULL;

  status_window = g_object_get_data (G_OBJECT (toplevel), "gtk-im-xim-status-window");
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
  if (status_window)
    return status_window->window;
  else if (!create)
    return NULL;

  status_window = g_new (StatusWindow, 1);
  status_window->window = gtk_window_new (GTK_WINDOW_POPUP);
  status_window->toplevel = toplevel;

  status_windows = g_slist_prepend (status_windows, status_window);
1223

1224
  window = status_window->window;
1225

1226 1227
  gtk_window_set_policy (GTK_WINDOW (window), FALSE, FALSE, FALSE);
  gtk_widget_set_app_paintable (window, TRUE);
1228 1229 1230 1231 1232

  status_label = gtk_label_new ("");
  gtk_misc_set_padding (GTK_MISC (status_label), 1, 1);
  gtk_widget_show (status_label);
  
1233
  gtk_container_add (GTK_CONTAINER (window), status_label);
1234

1235 1236 1237 1238 1239 1240
  status_window->destroy_handler_id = g_signal_connect_swapped (toplevel, "destroy",
								G_CALLBACK (status_window_free),
								status_window);
  status_window->configure_handler_id = g_signal_connect (toplevel, "configure_event",
							  G_CALLBACK (status_window_configure),
							  status_window);
1241 1242

  status_window_configure (toplevel, NULL, status_window);
1243 1244

  g_signal_connect (window, "style_set",
1245
		    G_CALLBACK (status_window_style_set), status_label);
1246
  g_signal_connect (window, "expose_event",
1247
		    G_CALLBACK (status_window_expose_event), NULL);
1248

1249 1250
  g_object_set_data (G_OBJECT (toplevel), "gt