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                                             gtk_im_multicontext_preedit_start_cb,
 167                                             multicontext);
 168       g_signal_handlers_disconnect_by_func (multicontext->slave,
 169                                             gtk_im_multicontext_preedit_end_cb,
 170                                             multicontext);
 171       g_signal_handlers_disconnect_by_func (multicontext->slave,
 172                                             gtk_im_multicontext_preedit_changed_cb,
 173                                             multicontext);
 174       g_signal_handlers_disconnect_by_func (multicontext->slave,
 175                                             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       if (!global_context_id)
 221         {
 222           const char *locale;
 223
 224 #ifdef HAVE_LC_MESSAGES
 225           locale = setlocale (LC_MESSAGES, NULL);
 226 #else
 227           locale = setlocale (LC_CTYPE, NULL);
 228 #endif
 229           global_context_id = _gtk_im_module_get_default_context_id (locale);
 230         }
 231
 232       gtk_im_multicontext_set_slave (multicontext, _gtk_im_module_create (global_context_id), FALSE);
 233       multicontext->context_id = global_context_id;
 234     }
 235
 236   return multicontext->slave;
 237 }
 238
 239 static void
 240 gtk_im_multicontext_set_client_window (GtkIMContext *context,
 241                                        GdkWindow    *window)
 242 {
 243   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 244   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 245
 246   multicontext->client_window = window;
 247
 248   if (slave)
 249     gtk_im_context_set_client_window (slave, window);
 250 }
 251
 252 static void
 253 gtk_im_multicontext_get_preedit_string (GtkIMContext   *context,
 254                                         gchar         **str,
 255                                         PangoAttrList **attrs,
 256                                         gint           *cursor_pos)
 257 {
 258   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 259   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 260
 261   if (slave)
 262     gtk_im_context_get_preedit_string (slave, str, attrs, cursor_pos);
 263   else
 264     {
 265       if (str)
 266         *str = g_strdup ("");
 267       if (attrs)
 268         *attrs = pango_attr_list_new ();
 269     }
 270 }
 271
 272 static gboolean
 273 gtk_im_multicontext_filter_keypress (GtkIMContext *context,
 274                                      GdkEventKey  *event)
 275 {
 276   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 277   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 278
 279   if (slave)
 280     return gtk_im_context_filter_keypress (slave, event);
 281   else
 282     return FALSE;
 283 }
 284
 285 static void
 286 gtk_im_multicontext_focus_in (GtkIMContext   *context)
 287 {
 288   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 289   GtkIMContext *slave;
 290
 291   /* If the global context type is different from the context we were
 292    * using before, get rid of the old slave and create a new one
 293    * for the new global context type.
 294    */
 295   if (!multicontext->context_id ||
 296       strcmp (global_context_id, multicontext->context_id) != 0)
 297     gtk_im_multicontext_set_slave (multicontext, NULL, FALSE);
 298
 299   slave = gtk_im_multicontext_get_slave (multicontext);
 300
 301   if (slave)
 302     gtk_im_context_focus_in (slave);
 303 }
 304
 305 static void
 306 gtk_im_multicontext_focus_out (GtkIMContext   *context)
 307 {
 308   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 309   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 310
 311   if (slave)
 312     gtk_im_context_focus_out (slave);
 313 }
 314
 315 static void
 316 gtk_im_multicontext_reset (GtkIMContext   *context)
 317 {
 318   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 319   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 320
 321   if (slave)
 322     gtk_im_context_reset (slave);
 323 }
 324
 325 static void
 326 gtk_im_multicontext_set_cursor_location (GtkIMContext   *context,
 327                                          GdkRectangle   *area)
 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_set_cursor_location (slave, area);
 334 }
 335
 336 static void
 337 gtk_im_multicontext_set_use_preedit (GtkIMContext   *context,
 338                                      gboolean       use_preedit)
 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_use_preedit (slave, use_preedit);
 345 }
 346
 347 static gboolean
 348 gtk_im_multicontext_get_surrounding (GtkIMContext  *context,
 349                                      gchar        **text,
 350                                      gint          *cursor_index)
 351 {
 352   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 353   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 354
 355   if (slave)
 356     return gtk_im_context_get_surrounding (context, text, cursor_index);
 357   else
 358     {
 359       if (text)
 360         *text = NULL;
 361       if (cursor_index)
 362         *cursor_index = 0;
 363
 364       return FALSE;
 365     }
 366 }
 367
 368 static void
 369 gtk_im_multicontext_set_surrounding (GtkIMContext *context,
 370                                      const char   *text,
 371                                      gint          len,
 372                                      gint          cursor_index)
 373 {
 374   GtkIMMulticontext *multicontext = GTK_IM_MULTICONTEXT (context);
 375   GtkIMContext *slave = gtk_im_multicontext_get_slave (multicontext);
 376
 377   if (slave)
 378     gtk_im_context_set_surrounding (slave, text, len, cursor_index);
 379 }
 380
 381 static void
 382 gtk_im_multicontext_preedit_start_cb   (GtkIMContext      *slave,
 383                                         GtkIMMulticontext *multicontext)
 384 {
 385   g_signal_emit_by_name (multicontext, "preedit_start");
 386 }
 387
 388 static void
 389 gtk_im_multicontext_preedit_end_cb (GtkIMContext      *slave,
 390                                     GtkIMMulticontext *multicontext)
 391 {
 392   g_signal_emit_by_name (multicontext, "preedit_end");
 393 }
 394
 395 static void
 396 gtk_im_multicontext_preedit_changed_cb (GtkIMContext      *slave,
 397                                         GtkIMMulticontext *multicontext)
 398 {
 399   g_signal_emit_by_name (multicontext, "preedit_changed");
 400 }
 401
 402 static void
 403 gtk_im_multicontext_commit_cb (GtkIMContext      *slave,
 404                                const gchar       *str,
 405                                GtkIMMulticontext *multicontext)
 406 {
 407   g_signal_emit_by_name (multicontext, "commit", str);;
 408 }
 409
 410 static gboolean
 411 gtk_im_multicontext_retrieve_surrounding_cb (GtkIMContext      *slave,
 412                                              GtkIMMulticontext *multicontext)
 413 {
 414   gboolean result;
 415
 416   g_signal_emit_by_name (multicontext, "retrieve_surrounding", &result);
 417
 418   return result;
 419 }
 420
 421 static gboolean
 422 gtk_im_multicontext_delete_surrounding_cb (GtkIMContext      *slave,
 423                                            gint               offset,
 424                                            gint               n_chars,
 425                                            GtkIMMulticontext *multicontext)
 426 {
 427   gboolean result;
 428
 429   g_signal_emit_by_name (multicontext, "delete_surrounding",
 430                          offset, n_chars, &result);
 431
 432   return result;
 433 }
 434
 435 static void
 436 activate_cb (GtkWidget         *menuitem,
 437              GtkIMMulticontext *context)
 438 {
 439   if (GTK_CHECK_MENU_ITEM (menuitem)->active)
 440     {
 441       const gchar *id = gtk_object_get_data (GTK_OBJECT (menuitem), "gtk-context-id");
 442
 443       gtk_im_context_reset (GTK_IM_CONTEXT (context));
 444
 445       global_context_id = id;
 446       gtk_im_multicontext_set_slave (context, NULL, FALSE);
 447     }
 448 }
 449
 450 /**
 451  * gtk_im_multicontext_append_menuitems:
 452  * @context: a #GtkIMMultiContext
 453  * @menushell: a #GtkMenuShell
 454  *
 455  * Add menuitems for various available input methods to a menu;
 456  * the menuitems, when selected, will switch the input method
 457  * for the context and the global default input method.
 458  **/
 459 void
 460 gtk_im_multicontext_append_menuitems (GtkIMMulticontext *context,
 461                                       GtkMenuShell      *menushell)
 462 {
 463   const GtkIMContextInfo **contexts;
 464   gint n_contexts, i;
 465   GSList *group = NULL;
 466
 467   _gtk_im_module_list (&contexts, &n_contexts);
 468
 469   for (i=0; i < n_contexts; i++)
 470     {
 471       GtkWidget *menuitem;
 472
 473       menuitem = gtk_radio_menu_item_new_with_label (group,
 474                                                      contexts[i]->context_name);
 475
 476       if ((global_context_id == NULL && group == NULL) ||
 477           (global_context_id &&
 478            strcmp (contexts[i]->context_id, global_context_id) == 0))
 479         gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (menuitem),
 480                                         TRUE);
 481
 482       group = gtk_radio_menu_item_group (GTK_RADIO_MENU_ITEM (menuitem));
 483
 484       gtk_object_set_data (GTK_OBJECT (menuitem), "gtk-context-id",
 485                            (char *)contexts[i]->context_id);
 486       gtk_signal_connect (GTK_OBJECT (menuitem), "activate",
 487                           G_CALLBACK (activate_cb), context);
 488
 489       gtk_widget_show (menuitem);
 490       gtk_menu_shell_append (menushell, menuitem);
 491     }
 492 }
 493