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 #include "gtkintl.h"
  29 #include "gtkprivate.h"
  30
  31 struct _GtkIMMulticontextPrivate
  32 {
  33   GdkWindow *client_window;
  34   GdkRectangle cursor_location;
  35
  36   guint use_preedit : 1;
  37   guint have_cursor_location : 1;
  38   guint focus_in : 1;
  39 };
  40
  41 static void     gtk_im_multicontext_class_init         (GtkIMMulticontextClass  *class);
  42 static void     gtk_im_multicontext_init               (GtkIMMulticontext       *im_multicontext);
  43 static void     gtk_im_multicontext_finalize           (GObject                 *object);
  44
  45 static void     gtk_im_multicontext_set_slave          (GtkIMMulticontext       *multicontext,
  46                                                         GtkIMContext            *slave,
  47                                                         gboolean                 finalizing);
  48
  49 static void     gtk_im_multicontext_set_client_window  (GtkIMContext            *context,
  50                                                         GdkWindow               *window);
  51 static void     gtk_im_multicontext_get_preedit_string (GtkIMContext            *context,
  52                                                         gchar                  **str,
  53                                                         PangoAttrList          **attrs,
  54                                                         gint                   *cursor_pos);
  55 static gboolean gtk_im_multicontext_filter_keypress    (GtkIMContext            *context,
  56                                                         GdkEventKey             *event);
  57 static void     gtk_im_multicontext_focus_in           (GtkIMContext            *context);
  58 static void     gtk_im_multicontext_focus_out          (GtkIMContext            *context);
  59 static void     gtk_im_multicontext_reset              (GtkIMContext            *context);
  60 static void     gtk_im_multicontext_set_cursor_location (GtkIMContext            *context,
  61                                                         GdkRectangle            *area);
  62 static void     gtk_im_multicontext_set_use_preedit    (GtkIMContext            *context,
  63                                                         gboolean                 use_preedit);
  64 static gboolean gtk_im_multicontext_get_surrounding    (GtkIMContext            *context,
  65                                                         gchar                  **text,
  66                                                         gint                    *cursor_index);
  67 static void     gtk_im_multicontext_set_surrounding    (GtkIMContext            *context,
  68                                                         const char              *text,
  69                                                         gint                     len,
  70                                                         gint                     cursor_index);
  71
  72 static void     gtk_im_multicontext_preedit_start_cb        (GtkIMContext      *slave,
  73                                                              GtkIMMulticontext *multicontext);
  74 static void     gtk_im_multicontext_preedit_end_cb          (GtkIMContext      *slave,
  75                                                              GtkIMMulticontext *multicontext);
  76 static void     gtk_im_multicontext_preedit_changed_cb      (GtkIMContext      *slave,
  77                                                              GtkIMMulticontext *multicontext);
  78 static void     gtk_im_multicontext_commit_cb               (GtkIMContext      *slave,
  79                                                              const gchar       *str,
  80                                                              GtkIMMulticontext *multicontext);
  81 static gboolean gtk_im_multicontext_retrieve_surrounding_cb (GtkIMContext      *slave,
  82                                                              GtkIMMulticontext *multicontext);
  83 static gboolean gtk_im_multicontext_delete_surrounding_cb   (GtkIMContext      *slave,
  84                                                              gint               offset,
  85                                                              gint               n_chars,
  86                                                              GtkIMMulticontext *multicontext);
  87 static GtkIMContextClass *parent_class;
  88
  89 static const gchar *global_context_id = NULL;
  90
  91 GType
  92 gtk_im_multicontext_get_type (void)
  93 {
  94   static GType im_multicontext_type = 0;
  95
  96   if (!im_multicontext_type)
  97     {
  98       static const GTypeInfo im_multicontext_info =
  99       {
 100         sizeof (GtkIMMulticontextClass),
 101         (GBaseInitFunc) NULL,
 102         (GBaseFinalizeFunc) NULL,
 103         (GClassInitFunc) gtk_im_multicontext_class_init,
 104         NULL,           /* class_finalize */
 105         NULL,           /* class_data */
 106         sizeof (GtkIMMulticontext),
 107         0,              /* n_preallocs */
 108         (GInstanceInitFunc) gtk_im_multicontext_init,
 109       };
 110
 111       im_multicontext_type =
 112         g_type_register_static (GTK_TYPE_IM_CONTEXT, "GtkIMMulticontext",
 113                                 &im_multicontext_info, 0);
 114     }
 115
 116   return im_multicontext_type;
 117 }
 118
 119 static void
 120 gtk_im_multicontext_class_init (GtkIMMulticontextClass *class)
 121 {
 122   GObjectClass *gobject_class = G_OBJECT_CLASS (class);
 123   GtkIMContextClass *im_context_class = GTK_IM_CONTEXT_CLASS (class);
 124
 125   parent_class = g_type_class_peek_parent (class);
 126
 127   im_context_class->set_client_window = gtk_im_multicontext_set_client_window;
 128   im_context_class->get_preedit_string = gtk_im_multicontext_get_preedit_string;
 129   im_context_class->filter_keypress = gtk_im_multicontext_filter_keypress;
 130   im_context_class->focus_in = gtk_im_multicontext_focus_in;
 131   im_context_class->focus_out = gtk_im_multicontext_focus_out;
 132   im_context_class->reset = gtk_im_multicontext_reset;
 133   im_context_class->set_cursor_location = gtk_im_multicontext_set_cursor_location;
 134   im_context_class->set_use_preedit = gtk_im_multicontext_set_use_preedit;
 135   im_context_class->set_surrounding = gtk_im_multicontext_set_surrounding;
 136   im_context_class->get_surrounding = gtk_im_multicontext_get_surrounding;
 137
 138   gobject_class->finalize = gtk_im_multicontext_finalize;
 139 }
 140
 141 static void
 142 gtk_im_multicontext_init (GtkIMMulticontext *multicontext)
 143 {
 144   multicontext->slave = NULL;
 145
 146   multicontext->priv = g_new0 (GtkIMMulticontextPrivate, 1);
 147   multicontext->priv->use_preedit = TRUE;
 148   multicontext->priv->have_cursor_location = FALSE;
 149   multicontext->priv->focus_in = FALSE;
 150 }
 151
 152 /**
 153  * gtk_im_multicontext_new:
 154  *
 155  * Creates a new #GtkIMMulticontext.
 156  *
 157  * Returns: a new #GtkIMMulticontext.
 158  **/
 159 GtkIMContext *
 160 gtk_im_multicontext_new (void)
 161 {
 162   return g_object_new (GTK_TYPE_IM_MULTICONTEXT, NULL);
 163 }
 164
 165 static void
 166 gtk_im_multicontext_finalize (GObject *object)
 167 {
 168   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (object);
 169
 170   gtk_im_multicontext_set_slave (multicontext, NULL, TRUE);
 171   g_free (multicontext->priv);
 172
 173   G_OBJECT_CLASS (parent_class)->finalize (object);
 174 }
 175
 176 static void
 177 gtk_im_multicontext_set_slave (GtkIMMulticontext *multicontext,
 178                                GtkIMContext      *slave,
 179                                gboolean           finalizing)
 180 {
 181   GtkIMMulticontextPrivate *priv = multicontext->priv;
 182   gboolean need_preedit_changed = FALSE;
 183
 184   if (multicontext->slave)
 185     {
 186       if (!finalizing)
 187         gtk_im_context_reset (multicontext->slave);
 188
 189       g_signal_handlers_disconnect_by_func (multicontext->slave,
 190                                             gtk_im_multicontext_preedit_start_cb,
 191                                             multicontext);
 192       g_signal_handlers_disconnect_by_func (multicontext->slave,
 193                                             gtk_im_multicontext_preedit_end_cb,
 194                                             multicontext);
 195       g_signal_handlers_disconnect_by_func (multicontext->slave,
 196                                             gtk_im_multicontext_preedit_changed_cb,
 197                                             multicontext);
 198       g_signal_handlers_disconnect_by_func (multicontext->slave,
 199                                             gtk_im_multicontext_commit_cb,
 200                                             multicontext);
 201
 202       g_object_unref (multicontext->slave);
 203       multicontext->slave = NULL;
 204
 205       if (!finalizing)
 206         need_preedit_changed = TRUE;
 207     }
 208
 209   multicontext->slave = slave;
 210
 211   if (multicontext->slave)
 212     {
 213       g_object_ref (multicontext->slave);
 214
 215       g_signal_connect (multicontext->slave, "preedit_start",
 216                         G_CALLBACK (gtk_im_multicontext_preedit_start_cb),
 217                         multicontext);
 218       g_signal_connect (multicontext->slave, "preedit_end",
 219                         G_CALLBACK (gtk_im_multicontext_preedit_end_cb),
 220                         multicontext);
 221       g_signal_connect (multicontext->slave, "preedit_changed",
 222                         G_CALLBACK (gtk_im_multicontext_preedit_changed_cb),
 223                         multicontext);
 224       g_signal_connect (multicontext->slave, "commit",
 225                         G_CALLBACK (gtk_im_multicontext_commit_cb),
 226                         multicontext);
 227       g_signal_connect (multicontext->slave, "retrieve_surrounding",
 228                         G_CALLBACK (gtk_im_multicontext_retrieve_surrounding_cb),
 229                         multicontext);
 230       g_signal_connect (multicontext->slave, "delete_surrounding",
 231                         G_CALLBACK (gtk_im_multicontext_delete_surrounding_cb),
 232                         multicontext);
 233
 234       if (!priv->use_preedit)   /* Default is TRUE */
 235         gtk_im_context_set_use_preedit (slave, FALSE);
 236       if (priv->client_window)
 237         gtk_im_context_set_client_window (slave, priv->client_window);
 238       if (priv->have_cursor_location)
 239         gtk_im_context_set_cursor_location (slave, &priv->cursor_location);
 240       if (priv->focus_in)
 241         gtk_im_context_focus_in (slave);
 242     }
 243
 244   if (need_preedit_changed)
 245     g_signal_emit_by_name (multicontext, "preedit_changed");
 246 }
 247
 248 static GtkIMContext *
 249 gtk_im_multicontext_get_slave (GtkIMMulticontext *multicontext)
 250 {
 251   if (!multicontext->slave)
 252     {
 253       GtkIMContext *slave;
 254
 255       if (!global_context_id)
 256         {
 257           const char *locale;
 258
 259           locale = setlocale (LC_CTYPE, NULL);
 260
 261           global_context_id = _gtk_im_module_get_default_context_id (locale);
 262         }
 263
 264       slave = _gtk_im_module_create (global_context_id);
 265       gtk_im_multicontext_set_slave (multicontext, slave, FALSE);
 266       g_object_unref (slave);
 267
 268       multicontext->context_id = global_context_id;
 269     }
 270
 271   return multicontext->slave;
 272 }
 273
 274 static void
 275 gtk_im_multicontext_set_client_window (GtkIMContext *context,
 276                                        GdkWindow    *window)
 277 {
 278   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 279
 280   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 281
 282   multicontext->priv->client_window = window;
 283
 284   if (slave)
 285     gtk_im_context_set_client_window (slave, window);
 286 }
 287
 288 static void
 289 gtk_im_multicontext_get_preedit_string (GtkIMContext   *context,
 290                                         gchar         **str,
 291                                         PangoAttrList **attrs,
 292                                         gint           *cursor_pos)
 293 {
 294   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 295   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 296
 297   if (slave)
 298     gtk_im_context_get_preedit_string (slave, str, attrs, cursor_pos);
 299   else
 300     {
 301       if (str)
 302         *str = g_strdup ("");
 303       if (attrs)
 304         *attrs = pango_attr_list_new ();
 305     }
 306 }
 307
 308 static gboolean
 309 gtk_im_multicontext_filter_keypress (GtkIMContext *context,
 310                                      GdkEventKey  *event)
 311 {
 312   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 313   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 314
 315   if (slave)
 316     return gtk_im_context_filter_keypress (slave, event);
 317   else
 318     return FALSE;
 319 }
 320
 321 static void
 322 gtk_im_multicontext_focus_in (GtkIMContext   *context)
 323 {
 324   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 325   GtkIMContext *slave;
 326
 327   /* If the global context type is different from the context we were
 328    * using before, get rid of the old slave and create a new one
 329    * for the new global context type.
 330    */
 331   if (!multicontext->context_id ||
 332       strcmp (global_context_id, multicontext->context_id) != 0)
 333     gtk_im_multicontext_set_slave (multicontext, NULL, FALSE);
 334
 335   slave = gtk_im_multicontext_get_slave (multicontext);
 336
 337   multicontext->priv->focus_in = TRUE;
 338
 339   if (slave)
 340     gtk_im_context_focus_in (slave);
 341 }
 342
 343 static void
 344 gtk_im_multicontext_focus_out (GtkIMContext   *context)
 345 {
 346   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 347   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 348
 349   multicontext->priv->focus_in = FALSE;
 350
 351   if (slave)
 352     gtk_im_context_focus_out (slave);
 353 }
 354
 355 static void
 356 gtk_im_multicontext_reset (GtkIMContext   *context)
 357 {
 358   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 359   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 360
 361   if (slave)
 362     gtk_im_context_reset (slave);
 363 }
 364
 365 static void
 366 gtk_im_multicontext_set_cursor_location (GtkIMContext   *context,
 367                                          GdkRectangle   *area)
 368 {
 369   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 370   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 371
 372   multicontext->priv->have_cursor_location = TRUE;
 373   multicontext->priv->cursor_location = *area;
 374
 375   if (slave)
 376     gtk_im_context_set_cursor_location (slave, area);
 377 }
 378
 379 static void
 380 gtk_im_multicontext_set_use_preedit (GtkIMContext   *context,
 381                                      gboolean       use_preedit)
 382 {
 383   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 384   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 385
 386   use_preedit = use_preedit != FALSE;
 387
 388   multicontext->priv->use_preedit = use_preedit;
 389
 390   if (slave)
 391     gtk_im_context_set_use_preedit (slave, use_preedit);
 392 }
 393
 394 static gboolean
 395 gtk_im_multicontext_get_surrounding (GtkIMContext  *context,
 396                                      gchar        **text,
 397                                      gint          *cursor_index)
 398 {
 399   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 400   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 401
 402   if (slave)
 403     return gtk_im_context_get_surrounding (slave, text, cursor_index);
 404   else
 405     {
 406       if (text)
 407         *text = NULL;
 408       if (cursor_index)
 409         *cursor_index = 0;
 410
 411       return FALSE;
 412     }
 413 }
 414
 415 static void
 416 gtk_im_multicontext_set_surrounding (GtkIMContext *context,
 417                                      const char   *text,
 418                                      gint          len,
 419                                      gint          cursor_index)
 420 {
 421   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 422   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 423
 424   if (slave)
 425     gtk_im_context_set_surrounding (slave, text, len, cursor_index);
 426 }
 427
 428 static void
 429 gtk_im_multicontext_preedit_start_cb   (GtkIMContext      *slave,
 430                                         GtkIMMulticontext *multicontext)
 431 {
 432   g_signal_emit_by_name (multicontext, "preedit_start");
 433 }
 434
 435 static void
 436 gtk_im_multicontext_preedit_end_cb (GtkIMContext      *slave,
 437                                     GtkIMMulticontext *multicontext)
 438 {
 439   g_signal_emit_by_name (multicontext, "preedit_end");
 440 }
 441
 442 static void
 443 gtk_im_multicontext_preedit_changed_cb (GtkIMContext      *slave,
 444                                         GtkIMMulticontext *multicontext)
 445 {
 446   g_signal_emit_by_name (multicontext, "preedit_changed");
 447 }
 448
 449 static void
 450 gtk_im_multicontext_commit_cb (GtkIMContext      *slave,
 451                                const gchar       *str,
 452                                GtkIMMulticontext *multicontext)
 453 {
 454   g_signal_emit_by_name (multicontext, "commit", str);;
 455 }
 456
 457 static gboolean
 458 gtk_im_multicontext_retrieve_surrounding_cb (GtkIMContext      *slave,
 459                                              GtkIMMulticontext *multicontext)
 460 {
 461   gboolean result;
 462
 463   g_signal_emit_by_name (multicontext, "retrieve_surrounding", &result);
 464
 465   return result;
 466 }
 467
 468 static gboolean
 469 gtk_im_multicontext_delete_surrounding_cb (GtkIMContext      *slave,
 470                                            gint               offset,
 471                                            gint               n_chars,
 472                                            GtkIMMulticontext *multicontext)
 473 {
 474   gboolean result;
 475
 476   g_signal_emit_by_name (multicontext, "delete_surrounding",
 477                          offset, n_chars, &result);
 478
 479   return result;
 480 }
 481
 482 static void
 483 activate_cb (GtkWidget         *menuitem,
 484              GtkIMMulticontext *context)
 485 {
 486   if (GTK_CHECK_MENU_ITEM (menuitem)->active)
 487     {
 488       const gchar *id = g_object_get_data (G_OBJECT (menuitem), "gtk-context-id");
 489
 490       gtk_im_context_reset (GTK_IM_CONTEXT (context));
 491
 492       global_context_id = id;
 493       gtk_im_multicontext_set_slave (context, NULL, FALSE);
 494     }
 495 }
 496
 497 /**
 498  * gtk_im_multicontext_append_menuitems:
 499  * @context: a #GtkIMMultiContext
 500  * @menushell: a #GtkMenuShell
 501  *
 502  * Add menuitems for various available input methods to a menu;
 503  * the menuitems, when selected, will switch the input method
 504  * for the context and the global default input method.
 505  **/
 506 void
 507 gtk_im_multicontext_append_menuitems (GtkIMMulticontext *context,
 508                                       GtkMenuShell      *menushell)
 509 {
 510   const GtkIMContextInfo **contexts;
 511   guint n_contexts, i;
 512   GSList *group = NULL;
 513
 514   _gtk_im_module_list (&contexts, &n_contexts);
 515
 516   for (i=0; i < n_contexts; i++)
 517     {
 518       GtkWidget *menuitem;
 519       const gchar *translated_name;
 520 #ifdef ENABLE_NLS
 521       if (contexts[i]->domain && contexts[i]->domain_dirname &&
 522           contexts[i]->domain[0] && contexts[i]->domain_dirname[0])
 523         {
 524           if (strcmp (contexts[i]->domain, GETTEXT_PACKAGE) == 0 &&
 525               strcmp (contexts[i]->domain_dirname, GTK_LOCALEDIR) == 0)
 526             /* Input method may have a name in the GTK+ message catalog */
 527             translated_name = _(contexts[i]->context_name);
 528           else
 529             /* Input method has own message catalog */
 530             {
 531               bindtextdomain (contexts[i]->domain,
 532                               contexts[i]->domain_dirname);
 533 #ifdef HAVE_BIND_TEXTDOMAIN_CODESET
 534               bind_textdomain_codeset (contexts[i]->domain, "UTF-8");
 535 #endif
 536               translated_name = dgettext (contexts[i]->domain, contexts[i]->context_name);
 537             }
 538         }
 539       else
 540         /* Either domain or domain_dirname is NULL or "". We assume that
 541          * input method does not want a translated name in this case
 542          */
 543         translated_name = contexts[i]->context_name;
 544 #else
 545       translated_name = contexts[i]->context_name;
 546 #endif
 547       menuitem = gtk_radio_menu_item_new_with_label (group,
 548                                                      translated_name);
 549
 550       if ((global_context_id == NULL && group == NULL) ||
 551           (global_context_id &&
 552            strcmp (contexts[i]->context_id, global_context_id) == 0))
 553         gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (menuitem),
 554                                         TRUE);
 555
 556       group = gtk_radio_menu_item_get_group (GTK_RADIO_MENU_ITEM (menuitem));
 557
 558       g_object_set_data (G_OBJECT (menuitem), "gtk-context-id",
 559                          (char *)contexts[i]->context_id);
 560       g_signal_connect (menuitem, "activate",
 561                         G_CALLBACK (activate_cb), context);
 562
 563       gtk_widget_show (menuitem);
 564       gtk_menu_shell_append (menushell, menuitem);
 565     }
 566
 567   g_free (contexts);
 568 }
 569