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