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