Pileus Git - ~andy/gtk/blob - gtk/gtkimmulticontext.c

   1 /* GTK - The GIMP Toolkit
   2  * Copyright (C) 2000 Red Hat, Inc.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <string.h>
  23 #include <locale.h>
  24
  25 #include "gtkimmulticontext.h"
  26 #include "gtkimmodule.h"
  27 #include "gtkradiomenuitem.h"
  28
  29 static void     gtk_im_multicontext_class_init         (GtkIMMulticontextClass  *class);
  30 static void     gtk_im_multicontext_init               (GtkIMMulticontext       *im_multicontext);
  31 static void     gtk_im_multicontext_finalize           (GObject                 *object);
  32
  33 static void     gtk_im_multicontext_set_slave          (GtkIMMulticontext       *multicontext,
  34                                                         GtkIMContext            *slave,
  35                                                         gboolean                 finalizing);
  36
  37 static void     gtk_im_multicontext_set_client_window  (GtkIMContext            *context,
  38                                                         GdkWindow               *window);
  39 static void     gtk_im_multicontext_get_preedit_string (GtkIMContext            *context,
  40                                                         gchar                  **str,
  41                                                         PangoAttrList          **attrs,
  42                                                         gint                   *cursor_pos);
  43 static gboolean gtk_im_multicontext_filter_keypress    (GtkIMContext            *context,
  44                                                         GdkEventKey             *event);
  45 static void     gtk_im_multicontext_focus_in           (GtkIMContext            *context);
  46 static void     gtk_im_multicontext_focus_out          (GtkIMContext            *context);
  47 static void     gtk_im_multicontext_reset              (GtkIMContext            *context);
  48 static void     gtk_im_multicontext_set_cursor_location (GtkIMContext            *context,
  49                                                         GdkRectangle            *area);
  50 static void     gtk_im_multicontext_set_use_preedit    (GtkIMContext            *context,
  51                                                         gboolean                 use_preedit);
  52 static gboolean gtk_im_multicontext_get_surrounding    (GtkIMContext            *context,
  53                                                         gchar                  **text,
  54                                                         gint                    *cursor_index);
  55 static void     gtk_im_multicontext_set_surrounding    (GtkIMContext            *context,
  56                                                         const char              *text,
  57                                                         gint                     len,
  58                                                         gint                     cursor_index);
  59
  60 static void     gtk_im_multicontext_preedit_start_cb        (GtkIMContext      *slave,
  61                                                              GtkIMMulticontext *multicontext);
  62 static void     gtk_im_multicontext_preedit_end_cb          (GtkIMContext      *slave,
  63                                                              GtkIMMulticontext *multicontext);
  64 static void     gtk_im_multicontext_preedit_changed_cb      (GtkIMContext      *slave,
  65                                                              GtkIMMulticontext *multicontext);
  66 static void     gtk_im_multicontext_commit_cb               (GtkIMContext      *slave,
  67                                                              const gchar       *str,
  68                                                              GtkIMMulticontext *multicontext);
  69 static gboolean gtk_im_multicontext_retrieve_surrounding_cb (GtkIMContext      *slave,
  70                                                              GtkIMMulticontext *multicontext);
  71 static gboolean gtk_im_multicontext_delete_surrounding_cb   (GtkIMContext      *slave,
  72                                                              gint               offset,
  73                                                              gint               n_chars,
  74                                                              GtkIMMulticontext *multicontext);
  75 static GtkIMContextClass *parent_class;
  76
  77 static const gchar *global_context_id = NULL;
  78
  79 GType
  80 gtk_im_multicontext_get_type (void)
  81 {
  82   static GType im_multicontext_type = 0;
  83
  84   if (!im_multicontext_type)
  85     {
  86       static const GTypeInfo im_multicontext_info =
  87       {
  88         sizeof (GtkIMMulticontextClass),
  89         (GBaseInitFunc) NULL,
  90         (GBaseFinalizeFunc) NULL,
  91         (GClassInitFunc) gtk_im_multicontext_class_init,
  92         NULL,           /* class_finalize */
  93         NULL,           /* class_data */
  94         sizeof (GtkIMMulticontext),
  95         0,              /* n_preallocs */
  96         (GInstanceInitFunc) gtk_im_multicontext_init,
  97       };
  98
  99       im_multicontext_type =
 100         g_type_register_static (GTK_TYPE_IM_CONTEXT, "GtkIMMulticontext",
 101                                 &im_multicontext_info, 0);
 102     }
 103
 104   return im_multicontext_type;
 105 }
 106
 107 static void
 108 gtk_im_multicontext_class_init (GtkIMMulticontextClass *class)
 109 {
 110   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 111   GtkIMContextClass *im_context_class = GTK_IM_CONTEXT_CLASS (class);
 112
 113   parent_class = g_type_class_peek_parent (class);
 114
 115   im_context_class->set_client_window = gtk_im_multicontext_set_client_window;
 116   im_context_class->get_preedit_string = gtk_im_multicontext_get_preedit_string;
 117   im_context_class->filter_keypress = gtk_im_multicontext_filter_keypress;
 118   im_context_class->focus_in = gtk_im_multicontext_focus_in;
 119   im_context_class->focus_out = gtk_im_multicontext_focus_out;
 120   im_context_class->reset = gtk_im_multicontext_reset;
 121   im_context_class->set_cursor_location = gtk_im_multicontext_set_cursor_location;
 122   im_context_class->set_use_preedit = gtk_im_multicontext_set_use_preedit;
 123   im_context_class->set_surrounding = gtk_im_multicontext_set_surrounding;
 124   im_context_class->get_surrounding = gtk_im_multicontext_get_surrounding;
 125
 126   gobject_class->finalize = gtk_im_multicontext_finalize;
 127 }
 128
 129 static void
 130 gtk_im_multicontext_init (GtkIMMulticontext *multicontext)
 131 {
 132   multicontext->slave = NULL;
 133 }
 134
 135 /**
 136  * gtk_im_multicontext_new:
 137  *
 138  * Creates a new #GtkIMMulticontext.
 139  *
 140  * Returns: a new #GtkIMMulticontext.
 141  **/
 142 GtkIMContext *
 143 gtk_im_multicontext_new (void)
 144 {
 145   return g_object_new (GTK_TYPE_IM_MULTICONTEXT, NULL);
 146 }
 147
 148 static void
 149 gtk_im_multicontext_finalize (GObject *object)
 150 {
 151   gtk_im_multicontext_set_slave (GTK_IM_MULTICONTEXT (object), NULL, TRUE);
 152
 153   G_OBJECT_CLASS (parent_class)->finalize (object);
 154 }
 155
 156 static void
 157 gtk_im_multicontext_set_slave (GtkIMMulticontext *multicontext,
 158                                GtkIMContext      *slave,
 159                                gboolean           finalizing)
 160 {
 161   gboolean need_preedit_changed = FALSE;
 162
 163   if (multicontext->slave)
 164     {
 165       if (!finalizing)
 166         gtk_im_context_reset (multicontext->slave);
 167
 168       g_signal_handlers_disconnect_by_func (multicontext->slave,
 169                                             gtk_im_multicontext_preedit_start_cb,
 170                                             multicontext);
 171       g_signal_handlers_disconnect_by_func (multicontext->slave,
 172                                             gtk_im_multicontext_preedit_end_cb,
 173                                             multicontext);
 174       g_signal_handlers_disconnect_by_func (multicontext->slave,
 175                                             gtk_im_multicontext_preedit_changed_cb,
 176                                             multicontext);
 177       g_signal_handlers_disconnect_by_func (multicontext->slave,
 178                                             gtk_im_multicontext_commit_cb,
 179                                             multicontext);
 180
 181       g_object_unref (multicontext->slave);
 182       multicontext->slave = NULL;
 183
 184       if (!finalizing)
 185         need_preedit_changed = TRUE;
 186     }
 187
 188   multicontext->slave = slave;
 189
 190   if (multicontext->slave)
 191     {
 192       g_object_ref (multicontext->slave);
 193
 194       g_signal_connect (multicontext->slave, "preedit_start",
 195                         G_CALLBACK (gtk_im_multicontext_preedit_start_cb),
 196                         multicontext);
 197       g_signal_connect (multicontext->slave, "preedit_end",
 198                         G_CALLBACK (gtk_im_multicontext_preedit_end_cb),
 199                         multicontext);
 200       g_signal_connect (multicontext->slave, "preedit_changed",
 201                         G_CALLBACK (gtk_im_multicontext_preedit_changed_cb),
 202                         multicontext);
 203       g_signal_connect (multicontext->slave, "commit",
 204                         G_CALLBACK (gtk_im_multicontext_commit_cb),
 205                         multicontext);
 206       g_signal_connect (multicontext->slave, "retrieve_surrounding",
 207                         G_CALLBACK (gtk_im_multicontext_retrieve_surrounding_cb),
 208                         multicontext);
 209       g_signal_connect (multicontext->slave, "delete_surrounding",
 210                         G_CALLBACK (gtk_im_multicontext_delete_surrounding_cb),
 211                         multicontext);
 212
 213       if (multicontext->client_window)
 214         gtk_im_context_set_client_window (slave, multicontext->client_window);
 215     }
 216
 217   if (need_preedit_changed)
 218     g_signal_emit_by_name (multicontext, "preedit_changed");
 219 }
 220
 221 static GtkIMContext *
 222 gtk_im_multicontext_get_slave (GtkIMMulticontext *multicontext)
 223 {
 224   if (!multicontext->slave)
 225     {
 226       GtkIMContext *slave;
 227
 228       if (!global_context_id)
 229         {
 230           const char *locale;
 231
 232 #ifdef HAVE_LC_MESSAGES
 233           locale = setlocale (LC_MESSAGES, NULL);
 234 #else
 235           locale = setlocale (LC_CTYPE, NULL);
 236 #endif
 237           global_context_id = _gtk_im_module_get_default_context_id (locale);
 238         }
 239
 240       slave = _gtk_im_module_create (global_context_id);
 241       gtk_im_multicontext_set_slave (multicontext, slave, FALSE);
 242       g_object_unref (slave);
 243
 244       multicontext->context_id = global_context_id;
 245     }
 246
 247   return multicontext->slave;
 248 }
 249
 250 static void
 251 gtk_im_multicontext_set_client_window (GtkIMContext *context,
 252                                        GdkWindow    *window)
 253 {
 254   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 255   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 256
 257   multicontext->client_window = window;
 258
 259   if (slave)
 260     gtk_im_context_set_client_window (slave, window);
 261 }
 262
 263 static void
 264 gtk_im_multicontext_get_preedit_string (GtkIMContext   *context,
 265                                         gchar         **str,
 266                                         PangoAttrList **attrs,
 267                                         gint           *cursor_pos)
 268 {
 269   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 270   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 271
 272   if (slave)
 273     gtk_im_context_get_preedit_string (slave, str, attrs, cursor_pos);
 274   else
 275     {
 276       if (str)
 277         *str = g_strdup ("");
 278       if (attrs)
 279         *attrs = pango_attr_list_new ();
 280     }
 281 }
 282
 283 static gboolean
 284 gtk_im_multicontext_filter_keypress (GtkIMContext *context,
 285                                      GdkEventKey  *event)
 286 {
 287   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 288   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 289
 290   if (slave)
 291     return gtk_im_context_filter_keypress (slave, event);
 292   else
 293     return FALSE;
 294 }
 295
 296 static void
 297 gtk_im_multicontext_focus_in (GtkIMContext   *context)
 298 {
 299   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 300   GtkIMContext *slave;
 301
 302   /* If the global context type is different from the context we were
 303    * using before, get rid of the old slave and create a new one
 304    * for the new global context type.
 305    */
 306   if (!multicontext->context_id ||
 307       strcmp (global_context_id, multicontext->context_id) != 0)
 308     gtk_im_multicontext_set_slave (multicontext, NULL, FALSE);
 309
 310   slave = gtk_im_multicontext_get_slave (multicontext);
 311
 312   if (slave)
 313     gtk_im_context_focus_in (slave);
 314 }
 315
 316 static void
 317 gtk_im_multicontext_focus_out (GtkIMContext   *context)
 318 {
 319   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 320   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 321
 322   if (slave)
 323     gtk_im_context_focus_out (slave);
 324 }
 325
 326 static void
 327 gtk_im_multicontext_reset (GtkIMContext   *context)
 328 {
 329   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 330   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 331
 332   if (slave)
 333     gtk_im_context_reset (slave);
 334 }
 335
 336 static void
 337 gtk_im_multicontext_set_cursor_location (GtkIMContext   *context,
 338                                          GdkRectangle   *area)
 339 {
 340   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 341   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 342
 343   if (slave)
 344     gtk_im_context_set_cursor_location (slave, area);
 345 }
 346
 347 static void
 348 gtk_im_multicontext_set_use_preedit (GtkIMContext   *context,
 349                                      gboolean       use_preedit)
 350 {
 351   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 352   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 353
 354   if (slave)
 355     gtk_im_context_set_use_preedit (slave, use_preedit);
 356 }
 357
 358 static gboolean
 359 gtk_im_multicontext_get_surrounding (GtkIMContext  *context,
 360                                      gchar        **text,
 361                                      gint          *cursor_index)
 362 {
 363   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 364   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 365
 366   if (slave)
 367     return gtk_im_context_get_surrounding (slave, text, cursor_index);
 368   else
 369     {
 370       if (text)
 371         *text = NULL;
 372       if (cursor_index)
 373         *cursor_index = 0;
 374
 375       return FALSE;
 376     }
 377 }
 378
 379 static void
 380 gtk_im_multicontext_set_surrounding (GtkIMContext *context,
 381                                      const char   *text,
 382                                      gint          len,
 383                                      gint          cursor_index)
 384 {
 385   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 386   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 387
 388   if (slave)
 389     gtk_im_context_set_surrounding (slave, text, len, cursor_index);
 390 }
 391
 392 static void
 393 gtk_im_multicontext_preedit_start_cb   (GtkIMContext      *slave,
 394                                         GtkIMMulticontext *multicontext)
 395 {
 396   g_signal_emit_by_name (multicontext, "preedit_start");
 397 }
 398
 399 static void
 400 gtk_im_multicontext_preedit_end_cb (GtkIMContext      *slave,
 401                                     GtkIMMulticontext *multicontext)
 402 {
 403   g_signal_emit_by_name (multicontext, "preedit_end");
 404 }
 405
 406 static void
 407 gtk_im_multicontext_preedit_changed_cb (GtkIMContext      *slave,
 408                                         GtkIMMulticontext *multicontext)
 409 {
 410   g_signal_emit_by_name (multicontext, "preedit_changed");
 411 }
 412
 413 static void
 414 gtk_im_multicontext_commit_cb (GtkIMContext      *slave,
 415                                const gchar       *str,
 416                                GtkIMMulticontext *multicontext)
 417 {
 418   g_signal_emit_by_name (multicontext, "commit", str);;
 419 }
 420
 421 static gboolean
 422 gtk_im_multicontext_retrieve_surrounding_cb (GtkIMContext      *slave,
 423                                              GtkIMMulticontext *multicontext)
 424 {
 425   gboolean result;
 426
 427   g_signal_emit_by_name (multicontext, "retrieve_surrounding", &result);
 428
 429   return result;
 430 }
 431
 432 static gboolean
 433 gtk_im_multicontext_delete_surrounding_cb (GtkIMContext      *slave,
 434                                            gint               offset,
 435                                            gint               n_chars,
 436                                            GtkIMMulticontext *multicontext)
 437 {
 438   gboolean result;
 439
 440   g_signal_emit_by_name (multicontext, "delete_surrounding",
 441                          offset, n_chars, &result);
 442
 443   return result;
 444 }
 445
 446 static void
 447 activate_cb (GtkWidget         *menuitem,
 448              GtkIMMulticontext *context)
 449 {
 450   if (GTK_CHECK_MENU_ITEM (menuitem)->active)
 451     {
 452       const gchar *id = g_object_get_data (G_OBJECT (menuitem), "gtk-context-id");
 453
 454       gtk_im_context_reset (GTK_IM_CONTEXT (context));
 455
 456       global_context_id = id;
 457       gtk_im_multicontext_set_slave (context, NULL, FALSE);
 458     }
 459 }
 460
 461 /**
 462  * gtk_im_multicontext_append_menuitems:
 463  * @context: a #GtkIMMultiContext
 464  * @menushell: a #GtkMenuShell
 465  *
 466  * Add menuitems for various available input methods to a menu;
 467  * the menuitems, when selected, will switch the input method
 468  * for the context and the global default input method.
 469  **/
 470 void
 471 gtk_im_multicontext_append_menuitems (GtkIMMulticontext *context,
 472                                       GtkMenuShell      *menushell)
 473 {
 474   const GtkIMContextInfo **contexts;
 475   guint n_contexts, i;
 476   GSList *group = NULL;
 477
 478   _gtk_im_module_list (&contexts, &n_contexts);
 479
 480   for (i=0; i < n_contexts; i++)
 481     {
 482       GtkWidget *menuitem;
 483
 484       menuitem = gtk_radio_menu_item_new_with_label (group,
 485                                                      contexts[i]->context_name);
 486
 487       if ((global_context_id == NULL && group == NULL) ||
 488           (global_context_id &&
 489            strcmp (contexts[i]->context_id, global_context_id) == 0))
 490         gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (menuitem),
 491                                         TRUE);
 492
 493       group = gtk_radio_menu_item_get_group (GTK_RADIO_MENU_ITEM (menuitem));
 494
 495       g_object_set_data (G_OBJECT (menuitem), "gtk-context-id",
 496                          (char *)contexts[i]->context_id);
 497       g_signal_connect (menuitem, "activate",
 498                         G_CALLBACK (activate_cb), context);
 499
 500       gtk_widget_show (menuitem);
 501       gtk_menu_shell_append (menushell, menuitem);
 502     }
 503
 504   g_free (contexts);
 505 }
 506