/* 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 "config.h"

#include <string.h>

#include "gtkimcontext.h"

#include "gtkmain.h"		/* For _gtk_boolean_handled_accumulator */

#include "gtkmarshalers.h"

#include "gtkintl.h"

#include "gtkalias.h"

/**

 * SECTION:gtkimcontext

 * @title: GtkIMContext

 * @short_description: Base class for input method contexts

 * @include: gtk/gtk.h,gtk/gtkimmodule.h

 *

 * #GtkIMContext defines the interface for GTK+ input methods. An input method

 * is used by GTK+ text input widgets like #GtkEntry to map from key events to

 * Unicode character strings.

 *

 * The user may change the current input method via a context menu, unless the   

 * #GtkSettings:gtk-show-input-method-menu GtkSettings property is set to FALSE. 

 * The default input method can be set programmatically via the 

 * #GtkSettings:gtk-im-module GtkSettings property. Alternatively, you may set 

 * the GTK_IM_MODULE environment variable as documented in #gtk-running.

 *

 * The #GtkEntry #GtkEntry:im-module and #GtkTextView #GtkTextView:im-module 

 * properties may also be used to set input methods for specific widget 

 * instances. For instance, a certain entry widget might be expected to contain 

 * certain characters which would be easier to input with a certain input 

 * method.

 *

 * An input method may consume multiple key events in sequence and finally

 * output the composed result. This is called preediting, and an input method

 * may provide feedback about this process by displaying the intermediate

 * composition states as preedit text. For instance, the default GTK+ input

 * method implements the input of arbitrary Unicode code points by holding down

 * the Control and Shift keys and then typing "U" followed by the hexadecimal

 * digits of the code point.  When releasing the Control and Shift keys,

 * preediting ends and the character is inserted as text. Ctrl+Shift+u20AC for

 * example results in the € sign.

 *

 * Additional input methods can be made available for use by GTK+ widgets as

 * loadable modules. An input method module is a small shared library which

 * implements a subclass of #GtkIMContext or #GtkIMContextSimple and exports

 * these four functions:

 *

 * <informalexample><programlisting>

 * void im_module_init(#GTypeModule *module);

 * </programlisting></informalexample>

 * This function should register the #GType of the #GtkIMContext subclass which

 * implements the input method by means of g_type_module_register_type(). Note

 * that g_type_register_static() cannot be used as the type needs to be

 * registered dynamically.

 *

 * <informalexample><programlisting>

 * void im_module_exit(void);

 * </programlisting></informalexample>

 * Here goes any cleanup code your input method might require on module unload.

 *

 * <informalexample><programlisting>

 * void im_module_list(const #GtkIMContextInfo ***contexts, int *n_contexts)

 * {

 *   *contexts = info_list;

 *   *n_contexts = G_N_ELEMENTS (info_list);

 * }

 * </programlisting></informalexample>

 * This function returns the list of input methods provided by the module. The

 * example implementation above shows a common solution and simply returns a

 * pointer to statically defined array of #GtkIMContextInfo items for each

 * provided input method.

 *

 * <informalexample><programlisting>

 * #GtkIMContext * im_module_create(const #gchar *context_id);

 * </programlisting></informalexample>

 * This function should return a pointer to a newly created instance of the

 * #GtkIMContext subclass identified by @context_id. The context ID is the same

 * as specified in the #GtkIMContextInfo array returned by im_module_list().

 *

 * After a new loadable input method module has been installed on the system,

 * the configuration file <filename>immodules.cache</filename> needs to be

 * regenerated by <link linkend="gtk-query-immodules-2.0">gtk-query-immodules-2.0</link>,

 * in order for the new input method to become available to GTK+ applications.

 */

enum {

  PREEDIT_START,

  PREEDIT_END,

  PREEDIT_CHANGED,

  COMMIT,

  RETRIEVE_SURROUNDING,

  DELETE_SURROUNDING,

  LAST_SIGNAL

};

static guint im_context_signals[LAST_SIGNAL] = { 0 };

static void     gtk_im_context_real_get_preedit_string (GtkIMContext   *context,

							gchar         **str,

							PangoAttrList **attrs,

							gint           *cursor_pos);

static gboolean gtk_im_context_real_filter_keypress    (GtkIMContext   *context,

							GdkEventKey    *event);

static gboolean gtk_im_context_real_get_surrounding    (GtkIMContext   *context,

							gchar         **text,

							gint           *cursor_index);

static void     gtk_im_context_real_set_surrounding    (GtkIMContext   *context,

							const char     *text,

							gint            len,

							gint            cursor_index);

G_DEFINE_ABSTRACT_TYPE (GtkIMContext, gtk_im_context, G_TYPE_OBJECT)

/**

 * GtkIMContextClass:

 * @preedit_start: Default handler of the #GtkIMContext::preedit-start signal.

 * @preedit_end: Default handler of the #GtkIMContext::preedit-end signal.

 * @preedit_changed: Default handler of the #GtkIMContext::preedit-changed

 *   signal.

 * @commit: Default handler of the #GtkIMContext::commit signal.

 * @retrieve_surrounding: Default handler of the

 *   #GtkIMContext::retrieve-surrounding signal.

 * @delete_surrounding: Default handler of the

 *   #GtkIMContext::delete-surrounding signal.

 * @set_client_window: Called via gtk_im_context_set_client_window() when the

 *   input window where the entered text will appear changes. Override this to

 *   keep track of the current input window, for instance for the purpose of

 *   positioning a status display of your input method.

 * @get_preedit_string: Called via gtk_im_context_get_preedit_string() to

 *   retrieve the text currently being preedited for display at the cursor

 *   position. Any input method which composes complex characters or any

 *   other compositions from multiple sequential key presses should override

 *   this method to provide feedback.

 * @filter_keypress: Called via gtk_im_context_filter_keypress() on every

 *   key press or release event. Every non-trivial input method needs to

 *   override this in order to implement the mapping from key events to text.

 *   A return value of %TRUE indicates to the caller that the event was

 *   consumed by the input method. In that case, the #GtkIMContext::commit

 *   signal should be emitted upon completion of a key sequence to pass the

 *   resulting text back to the input widget. Alternatively, %FALSE may be

 *   returned to indicate that the event wasn't handled by the input method.

 *   If a builtin mapping exists for the key, it is used to produce a

 *   character.

 * @focus_in: Called via gtk_im_context_focus_in() when the input widget

 *   has gained focus. May be overridden to keep track of the current focus.

 * @focus_out: Called via gtk_im_context_focus_in() when the input widget

 *   has lost focus. May be overridden to keep track of the current focus.

 * @reset: Called via gtk_im_context_reset() to signal a change such as a

 *   change in cursor position. An input method that implements preediting

 *   should override this method to clear the preedit state on reset.

 * @set_cursor_location: Called via gtk_im_context_set_cursor_location()

 *   to inform the input method of the current cursor location relative to

 *   the client window. May be overridden to implement the display of popup

 *   windows at the cursor position.

 * @set_use_preedit: Called via gtk_im_context_set_use_preedit() to control

 *   the use of the preedit string. Override this to display feedback by some

 *   other means if turned off.

 * @set_surrounding: Called via gtk_im_context_set_surrounding() in response

 *   to signal #GtkIMContext::retrieve-surrounding to update the input

 *   method's idea of the context around the cursor. It is not necessary to

 *   override this method even with input methods which implement

 *   context-dependent behavior. The base implementation is sufficient for

 *   gtk_im_context_get_surrounding() to work.

 * @get_surrounding: Called via gtk_im_context_get_surrounding() to update

 *   the context around the cursor location. It is not necessary to override

 *   this method even with input methods which implement context-dependent

 *   behavior. The base implementation emits

 *   #GtkIMContext::retrieve-surrounding and records the context received

 *   by the subsequent invocation of @get_surrounding.

 */

static void

gtk_im_context_class_init (GtkIMContextClass *klass)

{

  klass->get_preedit_string = gtk_im_context_real_get_preedit_string;

  klass->filter_keypress = gtk_im_context_real_filter_keypress;

  klass->get_surrounding = gtk_im_context_real_get_surrounding;

  klass->set_surrounding = gtk_im_context_real_set_surrounding;

  /**

   * GtkIMContext::preedit-start:

   * @context: the object on which the signal is emitted

   *

   * The ::preedit-start signal is emitted when a new preediting sequence

   * starts.

   */

  im_context_signals[PREEDIT_START] =

    g_signal_new (I_("preedit-start"),

		  G_TYPE_FROM_CLASS (klass),

		  G_SIGNAL_RUN_LAST,

		  G_STRUCT_OFFSET (GtkIMContextClass, preedit_start),

		  NULL, NULL,

		  _gtk_marshal_VOID__VOID,

		  G_TYPE_NONE, 0);

  /**

   * GtkIMContext::preedit-end:

   * @context: the object on which the signal is emitted

   *

   * The ::preedit-end signal is emitted when a preediting sequence

   * has been completed or canceled.

   */

  im_context_signals[PREEDIT_END] =

    g_signal_new (I_("preedit-end"),

		  G_TYPE_FROM_CLASS (klass),

		  G_SIGNAL_RUN_LAST,

		  G_STRUCT_OFFSET (GtkIMContextClass, preedit_end),

		  NULL, NULL,

		  _gtk_marshal_VOID__VOID,

		  G_TYPE_NONE, 0);

  /**

   * GtkIMContext::preedit-changed:

   * @context: the object on which the signal is emitted

   *

   * The ::preedit-changed signal is emitted whenever the preedit sequence

   * currently being entered has changed.  It is also emitted at the end of

   * a preedit sequence, in which case

   * gtk_im_context_get_preedit_string() returns the empty string.

   */

  im_context_signals[PREEDIT_CHANGED] =

    g_signal_new (I_("preedit-changed"),

		  G_TYPE_FROM_CLASS (klass),

		  G_SIGNAL_RUN_LAST,

		  G_STRUCT_OFFSET (GtkIMContextClass, preedit_changed),

		  NULL, NULL,

		  _gtk_marshal_VOID__VOID,

		  G_TYPE_NONE, 0);

  /**

   * GtkIMContext::commit:

   * @context: the object on which the signal is emitted

   * @str: the completed character(s) entered by the user

   *

   * The ::commit signal is emitted when a complete input sequence

   * has been entered by the user. This can be a single character

   * immediately after a key press or the final result of preediting.

   */

  im_context_signals[COMMIT] =

    g_signal_new (I_("commit"),

		  G_TYPE_FROM_CLASS (klass),

		  G_SIGNAL_RUN_LAST,

		  G_STRUCT_OFFSET (GtkIMContextClass, commit),

		  NULL, NULL,

		  _gtk_marshal_VOID__STRING,

		  G_TYPE_NONE, 1,

		  G_TYPE_STRING);

  /**

   * GtkIMContext::retrieve-surrounding:

   * @context: the object on which the signal is emitted

   *

   * The ::retrieve-surrounding signal is emitted when the input method

   * requires the context surrounding the cursor.  The callback should set

   * the input method surrounding context by calling the

   * gtk_im_context_set_surrounding() method.

   *

   * Return value: %TRUE if the signal was handled.

   */

  im_context_signals[RETRIEVE_SURROUNDING] =

    g_signal_new (I_("retrieve-surrounding"),

                  G_TYPE_FROM_CLASS (klass),

                  G_SIGNAL_RUN_LAST,

                  G_STRUCT_OFFSET (GtkIMContextClass, retrieve_surrounding),

                  _gtk_boolean_handled_accumulator, NULL,

                  _gtk_marshal_BOOLEAN__VOID,

                  G_TYPE_BOOLEAN, 0);

  /**

   * GtkIMContext::delete-surrounding:

   * @context: the object on which the signal is emitted

   * @offset:  the character offset from the cursor position of the text

   *           to be deleted. A negative value indicates a position before

   *           the cursor.

   * @n_chars: the number of characters to be deleted

   *

   * The ::delete-surrounding signal is emitted when the input method

   * needs to delete all or part of the context surrounding the cursor.

   *

   * Return value: %TRUE if the signal was handled.

   */

  im_context_signals[DELETE_SURROUNDING] =

    g_signal_new (I_("delete-surrounding"),

                  G_TYPE_FROM_CLASS (klass),

                  G_SIGNAL_RUN_LAST,

                  G_STRUCT_OFFSET (GtkIMContextClass, delete_surrounding),

                  _gtk_boolean_handled_accumulator, NULL,

                  _gtk_marshal_BOOLEAN__INT_INT,

                  G_TYPE_BOOLEAN, 2,

                  G_TYPE_INT,

		  G_TYPE_INT);

}

static void

gtk_im_context_init (GtkIMContext *im_context)

{

}

static void

gtk_im_context_real_get_preedit_string (GtkIMContext       *context,

					gchar             **str,

					PangoAttrList     **attrs,

					gint               *cursor_pos)

{

  if (str)

    *str = g_strdup ("");

  if (attrs)

    *attrs = pango_attr_list_new ();

  if (cursor_pos)

    *cursor_pos = 0;

}

static gboolean

gtk_im_context_real_filter_keypress (GtkIMContext       *context,

				     GdkEventKey        *event)

{

  return FALSE;

}

typedef struct

{

  gchar *text;

  gint cursor_index;

} SurroundingInfo;

static void

gtk_im_context_real_set_surrounding (GtkIMContext  *context,

				     const gchar   *text,

				     gint           len,

				     gint           cursor_index)

{

  SurroundingInfo *info = g_object_get_data (G_OBJECT (context),

                                             "gtk-im-surrounding-info");

  if (info)

    {

      g_free (info->text);

      info->text = g_strndup (text, len);

      info->cursor_index = cursor_index;

    }

}

static gboolean

gtk_im_context_real_get_surrounding (GtkIMContext *context,

				     gchar       **text,

				     gint         *cursor_index)

{

  gboolean result;

  gboolean info_is_local = FALSE;

  SurroundingInfo local_info = { NULL, 0 };

  SurroundingInfo *info;

  info = g_object_get_data (G_OBJECT (context), "gtk-im-surrounding-info");

  if (!info)

    {

      info = &local_info;

      g_object_set_data (G_OBJECT (context), I_("gtk-im-surrounding-info"), info);

      info_is_local = TRUE;

    }

  g_signal_emit (context,

		 im_context_signals[RETRIEVE_SURROUNDING], 0,

		 &result);

  if (result)

    {

      *text = g_strdup (info->text ? info->text : "");

      *cursor_index = info->cursor_index;

    }

  else

    {

      *text = NULL;

      *cursor_index = 0;

    }

  if (info_is_local)

    {

      g_free (info->text);

      g_object_set_data (G_OBJECT (context), I_("gtk-im-surrounding-info"), NULL);

    }

  return result;

}

/**

 * gtk_im_context_set_client_window:

 * @context: a #GtkIMContext

 * @window: (allow-none):  the client window. This may be %NULL to indicate

 *           that the previous client window no longer exists.

 * 

 * Set the client window for the input context; this is the

 * #GdkWindow in which the input appears. This window is

 * used in order to correctly position status windows, and may

 * also be used for purposes internal to the input method.

 **/

void

gtk_im_context_set_client_window (GtkIMContext *context,

				  GdkWindow    *window)

{

  GtkIMContextClass *klass;

  g_return_if_fail (GTK_IS_IM_CONTEXT (context));

  klass = GTK_IM_CONTEXT_GET_CLASS (context);

  if (klass->set_client_window)

    klass->set_client_window (context, window);

}

/**

 * gtk_im_context_get_preedit_string:

 * @context:    a #GtkIMContext

 * @str:        (out) (transfer full): location to store the retrieved

 *              string. The string retrieved must be freed with g_free().

 * @attrs:      (out) (transfer full): location to store the retrieved

 *              attribute list.  When you are done with this list, you

 *              must unreference it with pango_attr_list_unref().

 * @cursor_pos: (out): location to store position of cursor (in characters)

 *              within the preedit string.  

 * 

 * Retrieve the current preedit string for the input context,

 * and a list of attributes to apply to the string.

 * This string should be displayed inserted at the insertion

 * point.

 **/

void

gtk_im_context_get_preedit_string (GtkIMContext   *context,

				   gchar         **str,

				   PangoAttrList **attrs,

				   gint           *cursor_pos)

{

  GtkIMContextClass *klass;

  g_return_if_fail (GTK_IS_IM_CONTEXT (context));

  klass = GTK_IM_CONTEXT_GET_CLASS (context);

  klass->get_preedit_string (context, str, attrs, cursor_pos);

  g_return_if_fail (str == NULL || g_utf8_validate (*str, -1, NULL));

}

/**

 * gtk_im_context_filter_keypress:

 * @context: a #GtkIMContext

 * @event: the key event

 * 

 * Allow an input method to internally handle key press and release 

 * events. If this function returns %TRUE, then no further processing

 * should be done for this key event.

 * 

 * Return value: %TRUE if the input method handled the key event.

 *

 **/

gboolean

gtk_im_context_filter_keypress (GtkIMContext *context,

				GdkEventKey  *key)

{

  GtkIMContextClass *klass;

  g_return_val_if_fail (GTK_IS_IM_CONTEXT (context), FALSE);

  g_return_val_if_fail (key != NULL, FALSE);

  klass = GTK_IM_CONTEXT_GET_CLASS (context);

  return klass->filter_keypress (context, key);

}

/**

 * gtk_im_context_focus_in:

 * @context: a #GtkIMContext

 *

 * Notify the input method that the widget to which this

 * input context corresponds has gained focus. The input method

 * may, for example, change the displayed feedback to reflect

 * this change.

 **/

void

gtk_im_context_focus_in (GtkIMContext   *context)

{

  GtkIMContextClass *klass;

  g_return_if_fail (GTK_IS_IM_CONTEXT (context));

  klass = GTK_IM_CONTEXT_GET_CLASS (context);

  if (klass->focus_in)

    klass->focus_in (context);

}

/**

 * gtk_im_context_focus_out:

 * @context: a #GtkIMContext

 *

 * Notify the input method that the widget to which this

 * input context corresponds has lost focus. The input method

 * may, for example, change the displayed feedback or reset the contexts

 * state to reflect this change.

 **/

void

gtk_im_context_focus_out (GtkIMContext   *context)

{

  GtkIMContextClass *klass;

  g_return_if_fail (GTK_IS_IM_CONTEXT (context));

  klass = GTK_IM_CONTEXT_GET_CLASS (context);

  if (klass->focus_out)

    klass->focus_out (context);

}

/**

 * gtk_im_context_reset:

 * @context: a #GtkIMContext

 *

 * Notify the input method that a change such as a change in cursor

 * position has been made. This will typically cause the input

 * method to clear the preedit state.

 **/

void

gtk_im_context_reset (GtkIMContext   *context)

{

  GtkIMContextClass *klass;

  g_return_if_fail (GTK_IS_IM_CONTEXT (context));

  klass = GTK_IM_CONTEXT_GET_CLASS (context);

  if (klass->reset)

    klass->reset (context);

}

/**

 * gtk_im_context_set_cursor_location:

 * @context: a #GtkIMContext

 * @area: new location

 *

 * Notify the input method that a change in cursor 

 * position has been made. The location is relative to the client

 * window.

 **/

void

gtk_im_context_set_cursor_location (GtkIMContext       *context,

				    const GdkRectangle *area)

{

  GtkIMContextClass *klass;

  g_return_if_fail (GTK_IS_IM_CONTEXT (context));

  klass = GTK_IM_CONTEXT_GET_CLASS (context);

  if (klass->set_cursor_location)

    klass->set_cursor_location (context, (GdkRectangle *) area);

}

/**

 * gtk_im_context_set_use_preedit:

 * @context: a #GtkIMContext

 * @use_preedit: whether the IM context should use the preedit string.

 * 

 * Sets whether the IM context should use the preedit string

 * to display feedback. If @use_preedit is FALSE (default

 * is TRUE), then the IM context may use some other method to display

 * feedback, such as displaying it in a child of the root window.

 **/

void

gtk_im_context_set_use_preedit (GtkIMContext *context,

				gboolean      use_preedit)

{

  GtkIMContextClass *klass;

  g_return_if_fail (GTK_IS_IM_CONTEXT (context));

  klass = GTK_IM_CONTEXT_GET_CLASS (context);

  if (klass->set_use_preedit)

    klass->set_use_preedit (context, use_preedit);

}

/**

 * gtk_im_context_set_surrounding:

 * @context: a #GtkIMContext 

 * @text: text surrounding the insertion point, as UTF-8.

 *        the preedit string should not be included within

 *        @text.

 * @len: the length of @text, or -1 if @text is nul-terminated

 * @cursor_index: the byte index of the insertion cursor within @text.

 * 

 * Sets surrounding context around the insertion point and preedit

 * string. This function is expected to be called in response to the

 * GtkIMContext::retrieve_surrounding signal, and will likely have no

 * effect if called at other times.

 **/

void

gtk_im_context_set_surrounding (GtkIMContext  *context,

				const gchar   *text,

				gint           len,

				gint           cursor_index)

{

  GtkIMContextClass *klass;

  g_return_if_fail (GTK_IS_IM_CONTEXT (context));

  g_return_if_fail (text != NULL || len == 0);

  if (text == NULL && len == 0)

    text = "";

  if (len < 0)

    len = strlen (text);

  g_return_if_fail (cursor_index >= 0 && cursor_index <= len);

  klass = GTK_IM_CONTEXT_GET_CLASS (context);

  if (klass->set_surrounding)

    klass->set_surrounding (context, text, len, cursor_index);

}

/**

 * gtk_im_context_get_surrounding:

 * @context: a #GtkIMContext

 * @text: (out) (transfer full): location to store a UTF-8 encoded

 *        string of text holding context around the insertion point.

 *        If the function returns %TRUE, then you must free the result

 *        stored in this location with g_free().

 * @cursor_index: (out) location to store byte index of the insertion

 *        cursor within @text.

 * 

 * Retrieves context around the insertion point. Input methods

 * typically want context in order to constrain input text based on

 * existing text; this is important for languages such as Thai where

 * only some sequences of characters are allowed.

 *

 * This function is implemented by emitting the

 * GtkIMContext::retrieve_surrounding signal on the input method; in

 * response to this signal, a widget should provide as much context as

 * is available, up to an entire paragraph, by calling

 * gtk_im_context_set_surrounding(). Note that there is no obligation

 * for a widget to respond to the ::retrieve_surrounding signal, so input

 * methods must be prepared to function without context.

 *

 * Return value: %TRUE if surrounding text was provided; in this case

 *    you must free the result stored in *text.

 **/

gboolean

gtk_im_context_get_surrounding (GtkIMContext *context,

				gchar       **text,

				gint         *cursor_index)

{

  GtkIMContextClass *klass;

  gchar *local_text = NULL;

  gint local_index;

  gboolean result = FALSE;

  g_return_val_if_fail (GTK_IS_IM_CONTEXT (context), FALSE);

  klass = GTK_IM_CONTEXT_GET_CLASS (context);

  if (klass->get_surrounding)

    result = klass->get_surrounding (context,

				     text ? text : &local_text,

				     cursor_index ? cursor_index : &local_index);

  if (result)

    g_free (local_text);

  return result;

}

/**

 * gtk_im_context_delete_surrounding:

 * @context: a #GtkIMContext

 * @offset: offset from cursor position in chars;

 *    a negative value means start before the cursor.

 * @n_chars: number of characters to delete.

 * 

 * Asks the widget that the input context is attached to to delete

 * characters around the cursor position by emitting the

 * GtkIMContext::delete_surrounding signal. Note that @offset and @n_chars

 * are in characters not in bytes which differs from the usage other

 * places in #GtkIMContext.

 *

 * In order to use this function, you should first call

 * gtk_im_context_get_surrounding() to get the current context, and

 * call this function immediately afterwards to make sure that you

 * know what you are deleting. You should also account for the fact

 * that even if the signal was handled, the input context might not

 * have deleted all the characters that were requested to be deleted.

 *

 * This function is used by an input method that wants to make

 * subsitutions in the existing text in response to new input. It is

 * not useful for applications.

 * 

 * Return value: %TRUE if the signal was handled.

 **/

gboolean

gtk_im_context_delete_surrounding (GtkIMContext *context,

				   gint          offset,

				   gint          n_chars)

{

  gboolean result;

  g_return_val_if_fail (GTK_IS_IM_CONTEXT (context), FALSE);

  g_signal_emit (context,

		 im_context_signals[DELETE_SURROUNDING], 0,

		 offset, n_chars, &result);

  return result;

}

#define __GTK_IM_CONTEXT_C__

#include "gtkaliasdef.c"