libs/gtkutil/accelerator.cpp

   1 /*
   2    Copyright (C) 2001-2006, William Joseph.
   3    All Rights Reserved.
   4
   5    This file is part of GtkRadiant.
   6
   7    GtkRadiant is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    GtkRadiant is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with GtkRadiant; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  20  */
  21
  22 #include "accelerator.h"
  23
  24 #include "debugging/debugging.h"
  25
  26 #include <map>
  27 #include <set>
  28 #include <gtk/gtk.h>
  29
  30 #include "generic/callback.h"
  31 #include "generic/bitfield.h"
  32 #include "string/string.h"
  33
  34 #include "pointer.h"
  35 #include "closure.h"
  36
  37 #include <gdk/gdkkeysyms.h>
  38
  39
  40 const char *global_keys_find(unsigned int key)
  41 {
  42     const char *s;
  43     if (key == 0) {
  44         return "";
  45     }
  46     s = gdk_keyval_name(key);
  47     if (!s) {
  48         return "";
  49     }
  50     return s;
  51 }
  52
  53 unsigned int global_keys_find(const char *name)
  54 {
  55     guint k;
  56     if (!name || !*name) {
  57         return 0;
  58     }
  59     k = gdk_keyval_from_name(name);
  60     if (k == GDK_KEY_VoidSymbol) {
  61         return 0;
  62     }
  63     return k;
  64 }
  65
  66 void accelerator_write(const Accelerator &accelerator, TextOutputStream &ostream)
  67 {
  68 #if 0
  69     if ( accelerator.modifiers & GDK_SHIFT_MASK ) {
  70         ostream << "Shift + ";
  71     }
  72     if ( accelerator.modifiers & GDK_MOD1_MASK ) {
  73         ostream << "Alt + ";
  74     }
  75     if ( accelerator.modifiers & GDK_CONTROL_MASK ) {
  76         ostream << "Control + ";
  77     }
  78
  79     const char* keyName = global_keys_find( accelerator.key );
  80     if ( !string_empty( keyName ) ) {
  81         ostream << keyName;
  82     }
  83     else
  84     {
  85         ostream << static_cast<char>( accelerator.key );
  86     }
  87 #endif
  88     ostream << gtk_accelerator_get_label(accelerator.key, accelerator.modifiers);
  89 }
  90
  91 typedef std::map<Accelerator, Callback<void()>> AcceleratorMap;
  92 typedef std::set<Accelerator> AcceleratorSet;
  93
  94 bool accelerator_map_insert(AcceleratorMap &acceleratorMap, Accelerator accelerator, const Callback<void()> &callback)
  95 {
  96     if (accelerator.key != 0) {
  97         return acceleratorMap.insert(AcceleratorMap::value_type(accelerator, callback)).second;
  98     }
  99     return true;
 100 }
 101
 102 bool accelerator_map_erase(AcceleratorMap &acceleratorMap, Accelerator accelerator)
 103 {
 104     if (accelerator.key != 0) {
 105         AcceleratorMap::iterator i = acceleratorMap.find(accelerator);
 106         if (i == acceleratorMap.end()) {
 107             return false;
 108         }
 109         acceleratorMap.erase(i);
 110     }
 111     return true;
 112 }
 113
 114 Accelerator accelerator_for_event_key(guint keyval, guint state)
 115 {
 116     keyval = gdk_keyval_to_upper(keyval);
 117     if (keyval == GDK_KEY_ISO_Left_Tab) {
 118         keyval = GDK_KEY_Tab;
 119     }
 120     return Accelerator(keyval, (GdkModifierType) (state & gtk_accelerator_get_default_mod_mask()));
 121 }
 122
 123 bool AcceleratorMap_activate(const AcceleratorMap &acceleratorMap, const Accelerator &accelerator)
 124 {
 125     AcceleratorMap::const_iterator i = acceleratorMap.find(accelerator);
 126     if (i != acceleratorMap.end()) {
 127         (*i).second();
 128         return true;
 129     }
 130
 131     return false;
 132 }
 133
 134 static gboolean accelerator_key_event(ui::Window window, GdkEventKey *event, AcceleratorMap *acceleratorMap)
 135 {
 136     return AcceleratorMap_activate(*acceleratorMap, accelerator_for_event_key(event->keyval, event->state));
 137 }
 138
 139
 140 AcceleratorMap g_special_accelerators;
 141
 142
 143 namespace MouseButton {
 144     enum {
 145         Left = 1 << 0,
 146         Right = 1 << 1,
 147         Middle = 1 << 2,
 148     };
 149 }
 150
 151 typedef unsigned int ButtonMask;
 152
 153 void print_buttons(ButtonMask mask)
 154 {
 155     globalOutputStream() << "button state: ";
 156     if ((mask & MouseButton::Left) != 0) {
 157         globalOutputStream() << "Left ";
 158     }
 159     if ((mask & MouseButton::Right) != 0) {
 160         globalOutputStream() << "Right ";
 161     }
 162     if ((mask & MouseButton::Middle) != 0) {
 163         globalOutputStream() << "Middle ";
 164     }
 165     globalOutputStream() << "\n";
 166 }
 167
 168 ButtonMask ButtonMask_for_event_button(guint button)
 169 {
 170     switch (button) {
 171         case 1:
 172             return MouseButton::Left;
 173         case 2:
 174             return MouseButton::Middle;
 175         case 3:
 176             return MouseButton::Right;
 177     }
 178     return 0;
 179 }
 180
 181 bool window_has_accel(ui::Window toplevel)
 182 {
 183     return g_slist_length(gtk_accel_groups_from_object(G_OBJECT(toplevel))) != 0;
 184 }
 185
 186 namespace {
 187     bool g_accel_enabled = true;
 188 }
 189
 190 bool global_accel_enabled()
 191 {
 192     return g_accel_enabled;
 193 }
 194
 195
 196 GClosure *accel_group_add_accelerator(ui::AccelGroup group, Accelerator accelerator, const Callback<void()> &callback);
 197
 198 void accel_group_remove_accelerator(ui::AccelGroup group, Accelerator accelerator);
 199
 200 AcceleratorMap g_queuedAcceleratorsAdd;
 201 AcceleratorSet g_queuedAcceleratorsRemove;
 202
 203 void globalQueuedAccelerators_add(Accelerator accelerator, const Callback<void()> &callback)
 204 {
 205     if (!g_queuedAcceleratorsAdd.insert(AcceleratorMap::value_type(accelerator, callback)).second) {
 206         globalErrorStream() << "globalQueuedAccelerators_add: accelerator already queued: " << accelerator << "\n";
 207     }
 208 }
 209
 210 void globalQueuedAccelerators_remove(Accelerator accelerator)
 211 {
 212     if (g_queuedAcceleratorsAdd.erase(accelerator) == 0) {
 213         if (!g_queuedAcceleratorsRemove.insert(accelerator).second) {
 214             globalErrorStream() << "globalQueuedAccelerators_remove: accelerator already queued: " << accelerator
 215                                 << "\n";
 216         }
 217     }
 218 }
 219
 220 void globalQueuedAccelerators_commit()
 221 {
 222     for (AcceleratorSet::const_iterator i = g_queuedAcceleratorsRemove.begin();
 223          i != g_queuedAcceleratorsRemove.end(); ++i) {
 224         //globalOutputStream() << "removing: " << (*i).first << "\n";
 225         accel_group_remove_accelerator(global_accel, *i);
 226     }
 227     g_queuedAcceleratorsRemove.clear();
 228     for (AcceleratorMap::const_iterator i = g_queuedAcceleratorsAdd.begin(); i != g_queuedAcceleratorsAdd.end(); ++i) {
 229         //globalOutputStream() << "adding: " << (*i).first << "\n";
 230         accel_group_add_accelerator(global_accel, (*i).first, (*i).second);
 231     }
 232     g_queuedAcceleratorsAdd.clear();
 233 }
 234
 235 typedef std::set<ui::Window> WindowSet;
 236 WindowSet g_accel_windows;
 237
 238 bool Buttons_press(ButtonMask &buttons, guint button, guint state)
 239 {
 240     if (buttons == 0 && bitfield_enable(buttons, ButtonMask_for_event_button(button)) != 0) {
 241         ASSERT_MESSAGE(g_accel_enabled, "Buttons_press: accelerators not enabled");
 242         g_accel_enabled = false;
 243         for (WindowSet::iterator i = g_accel_windows.begin(); i != g_accel_windows.end(); ++i) {
 244             ui::Window toplevel = *i;
 245             ASSERT_MESSAGE(window_has_accel(toplevel), "ERROR");
 246             ASSERT_MESSAGE(gtk_widget_is_toplevel(toplevel), "disabling accel for non-toplevel window");
 247             gtk_window_remove_accel_group(toplevel, global_accel);
 248 #if 0
 249             globalOutputStream() << reinterpret_cast<unsigned int>( toplevel ) << ": disabled global accelerators\n";
 250 #endif
 251         }
 252     }
 253     buttons = bitfield_enable(buttons, ButtonMask_for_event_button(button));
 254 #if 0
 255     globalOutputStream() << "Buttons_press: ";
 256     print_buttons( buttons );
 257 #endif
 258     return false;
 259 }
 260
 261 bool Buttons_release(ButtonMask &buttons, guint button, guint state)
 262 {
 263     if (buttons != 0 && bitfield_disable(buttons, ButtonMask_for_event_button(button)) == 0) {
 264         ASSERT_MESSAGE(!g_accel_enabled, "Buttons_release: accelerators are enabled");
 265         g_accel_enabled = true;
 266         for (WindowSet::iterator i = g_accel_windows.begin(); i != g_accel_windows.end(); ++i) {
 267             ui::Window toplevel = *i;
 268             ASSERT_MESSAGE(!window_has_accel(toplevel), "ERROR");
 269             ASSERT_MESSAGE(gtk_widget_is_toplevel(toplevel), "enabling accel for non-toplevel window");
 270             toplevel.add_accel_group(global_accel);
 271 #if 0
 272             globalOutputStream() << reinterpret_cast<unsigned int>( toplevel ) << ": enabled global accelerators\n";
 273 #endif
 274         }
 275         globalQueuedAccelerators_commit();
 276     }
 277     buttons = bitfield_disable(buttons, ButtonMask_for_event_button(button));
 278 #if 0
 279     globalOutputStream() << "Buttons_release: ";
 280     print_buttons( buttons );
 281 #endif
 282     return false;
 283 }
 284
 285 bool Buttons_releaseAll(ButtonMask &buttons)
 286 {
 287     Buttons_release(buttons, MouseButton::Left | MouseButton::Middle | MouseButton::Right, 0);
 288     return false;
 289 }
 290
 291 struct PressedButtons {
 292     ButtonMask buttons;
 293
 294     PressedButtons() : buttons(0)
 295     {
 296     }
 297 };
 298
 299 gboolean PressedButtons_button_press(ui::Widget widget, GdkEventButton *event, PressedButtons *pressed)
 300 {
 301     if (event->type == GDK_BUTTON_PRESS) {
 302         return Buttons_press(pressed->buttons, event->button, event->state);
 303     }
 304     return FALSE;
 305 }
 306
 307 gboolean PressedButtons_button_release(ui::Widget widget, GdkEventButton *event, PressedButtons *pressed)
 308 {
 309     if (event->type == GDK_BUTTON_RELEASE) {
 310         return Buttons_release(pressed->buttons, event->button, event->state);
 311     }
 312     return FALSE;
 313 }
 314
 315 gboolean PressedButtons_focus_out(ui::Widget widget, GdkEventFocus *event, PressedButtons *pressed)
 316 {
 317     Buttons_releaseAll(pressed->buttons);
 318     return FALSE;
 319 }
 320
 321 void PressedButtons_connect(PressedButtons &pressedButtons, ui::Widget widget)
 322 {
 323     widget.connect("button_press_event", G_CALLBACK(PressedButtons_button_press), &pressedButtons);
 324     widget.connect("button_release_event", G_CALLBACK(PressedButtons_button_release), &pressedButtons);
 325     widget.connect("focus_out_event", G_CALLBACK(PressedButtons_focus_out), &pressedButtons);
 326 }
 327
 328 PressedButtons g_pressedButtons;
 329
 330
 331 #include <set>
 332 #include <uilib/uilib.h>
 333
 334 struct PressedKeys {
 335     typedef std::set<guint> Keys;
 336     Keys keys;
 337     std::size_t refcount;
 338
 339     PressedKeys() : refcount(0)
 340     {
 341     }
 342 };
 343
 344 AcceleratorMap g_keydown_accelerators;
 345 AcceleratorMap g_keyup_accelerators;
 346
 347 bool Keys_press(PressedKeys::Keys &keys, guint keyval)
 348 {
 349     if (keys.insert(keyval).second) {
 350         return AcceleratorMap_activate(g_keydown_accelerators, accelerator_for_event_key(keyval, 0));
 351     }
 352     return g_keydown_accelerators.find(accelerator_for_event_key(keyval, 0)) != g_keydown_accelerators.end();
 353 }
 354
 355 bool Keys_release(PressedKeys::Keys &keys, guint keyval)
 356 {
 357     if (keys.erase(keyval) != 0) {
 358         return AcceleratorMap_activate(g_keyup_accelerators, accelerator_for_event_key(keyval, 0));
 359     }
 360     return g_keyup_accelerators.find(accelerator_for_event_key(keyval, 0)) != g_keyup_accelerators.end();
 361 }
 362
 363 void Keys_releaseAll(PressedKeys::Keys &keys, guint state)
 364 {
 365     for (PressedKeys::Keys::iterator i = keys.begin(); i != keys.end(); ++i) {
 366         AcceleratorMap_activate(g_keyup_accelerators, accelerator_for_event_key(*i, state));
 367     }
 368     keys.clear();
 369 }
 370
 371 gboolean PressedKeys_key_press(ui::Widget widget, GdkEventKey *event, PressedKeys *pressedKeys)
 372 {
 373     //globalOutputStream() << "pressed: " << event->keyval << "\n";
 374     return event->state == 0 && Keys_press(pressedKeys->keys, event->keyval);
 375 }
 376
 377 gboolean PressedKeys_key_release(ui::Widget widget, GdkEventKey *event, PressedKeys *pressedKeys)
 378 {
 379     //globalOutputStream() << "released: " << event->keyval << "\n";
 380     return Keys_release(pressedKeys->keys, event->keyval);
 381 }
 382
 383 gboolean PressedKeys_focus_in(ui::Widget widget, GdkEventFocus *event, PressedKeys *pressedKeys)
 384 {
 385     ++pressedKeys->refcount;
 386     return FALSE;
 387 }
 388
 389 gboolean PressedKeys_focus_out(ui::Widget widget, GdkEventFocus *event, PressedKeys *pressedKeys)
 390 {
 391     if (--pressedKeys->refcount == 0) {
 392         Keys_releaseAll(pressedKeys->keys, 0);
 393     }
 394     return FALSE;
 395 }
 396
 397 PressedKeys g_pressedKeys;
 398
 399 void GlobalPressedKeys_releaseAll()
 400 {
 401     Keys_releaseAll(g_pressedKeys.keys, 0);
 402 }
 403
 404 void GlobalPressedKeys_connect(ui::Window window)
 405 {
 406     unsigned int key_press_handler = window.connect("key_press_event", G_CALLBACK(PressedKeys_key_press),
 407                                                     &g_pressedKeys);
 408     unsigned int key_release_handler = window.connect("key_release_event", G_CALLBACK(PressedKeys_key_release),
 409                                                       &g_pressedKeys);
 410     g_object_set_data(G_OBJECT(window), "key_press_handler", gint_to_pointer(key_press_handler));
 411     g_object_set_data(G_OBJECT(window), "key_release_handler", gint_to_pointer(key_release_handler));
 412     unsigned int focus_in_handler = window.connect("focus_in_event", G_CALLBACK(PressedKeys_focus_in), &g_pressedKeys);
 413     unsigned int focus_out_handler = window.connect("focus_out_event", G_CALLBACK(PressedKeys_focus_out),
 414                                                     &g_pressedKeys);
 415     g_object_set_data(G_OBJECT(window), "focus_in_handler", gint_to_pointer(focus_in_handler));
 416     g_object_set_data(G_OBJECT(window), "focus_out_handler", gint_to_pointer(focus_out_handler));
 417 }
 418
 419 void GlobalPressedKeys_disconnect(ui::Window window)
 420 {
 421     g_signal_handler_disconnect(G_OBJECT(window),
 422                                 gpointer_to_int(g_object_get_data(G_OBJECT(window), "key_press_handler")));
 423     g_signal_handler_disconnect(G_OBJECT(window),
 424                                 gpointer_to_int(g_object_get_data(G_OBJECT(window), "key_release_handler")));
 425     g_signal_handler_disconnect(G_OBJECT(window),
 426                                 gpointer_to_int(g_object_get_data(G_OBJECT(window), "focus_in_handler")));
 427     g_signal_handler_disconnect(G_OBJECT(window),
 428                                 gpointer_to_int(g_object_get_data(G_OBJECT(window), "focus_out_handler")));
 429 }
 430
 431
 432 void special_accelerators_add(Accelerator accelerator, const Callback<void()> &callback)
 433 {
 434     //globalOutputStream() << "special_accelerators_add: " << makeQuoted(accelerator) << "\n";
 435     if (!accelerator_map_insert(g_special_accelerators, accelerator, callback)) {
 436         globalErrorStream() << "special_accelerators_add: already exists: " << makeQuoted(accelerator) << "\n";
 437     }
 438 }
 439
 440 void special_accelerators_remove(Accelerator accelerator)
 441 {
 442     //globalOutputStream() << "special_accelerators_remove: " << makeQuoted(accelerator) << "\n";
 443     if (!accelerator_map_erase(g_special_accelerators, accelerator)) {
 444         globalErrorStream() << "special_accelerators_remove: not found: " << makeQuoted(accelerator) << "\n";
 445     }
 446 }
 447
 448 void keydown_accelerators_add(Accelerator accelerator, const Callback<void()> &callback)
 449 {
 450     //globalOutputStream() << "keydown_accelerators_add: " << makeQuoted(accelerator) << "\n";
 451     if (!accelerator_map_insert(g_keydown_accelerators, accelerator, callback)) {
 452         globalErrorStream() << "keydown_accelerators_add: already exists: " << makeQuoted(accelerator) << "\n";
 453     }
 454 }
 455
 456 void keydown_accelerators_remove(Accelerator accelerator)
 457 {
 458     //globalOutputStream() << "keydown_accelerators_remove: " << makeQuoted(accelerator) << "\n";
 459     if (!accelerator_map_erase(g_keydown_accelerators, accelerator)) {
 460         globalErrorStream() << "keydown_accelerators_remove: not found: " << makeQuoted(accelerator) << "\n";
 461     }
 462 }
 463
 464 void keyup_accelerators_add(Accelerator accelerator, const Callback<void()> &callback)
 465 {
 466     //globalOutputStream() << "keyup_accelerators_add: " << makeQuoted(accelerator) << "\n";
 467     if (!accelerator_map_insert(g_keyup_accelerators, accelerator, callback)) {
 468         globalErrorStream() << "keyup_accelerators_add: already exists: " << makeQuoted(accelerator) << "\n";
 469     }
 470 }
 471
 472 void keyup_accelerators_remove(Accelerator accelerator)
 473 {
 474     //globalOutputStream() << "keyup_accelerators_remove: " << makeQuoted(accelerator) << "\n";
 475     if (!accelerator_map_erase(g_keyup_accelerators, accelerator)) {
 476         globalErrorStream() << "keyup_accelerators_remove: not found: " << makeQuoted(accelerator) << "\n";
 477     }
 478 }
 479
 480
 481 gboolean
 482 accel_closure_callback(ui::AccelGroup group, ui::Widget widget, guint key, GdkModifierType modifiers, gpointer data)
 483 {
 484     (*reinterpret_cast<Callback<void()> *>( data ))();
 485     return TRUE;
 486 }
 487
 488 GClosure *accel_group_add_accelerator(ui::AccelGroup group, Accelerator accelerator, const Callback<void()> &callback)
 489 {
 490     if (accelerator.key != 0 && gtk_accelerator_valid(accelerator.key, accelerator.modifiers)) {
 491         //globalOutputStream() << "global_accel_connect: " << makeQuoted(accelerator) << "\n";
 492         GClosure *closure = create_cclosure(G_CALLBACK(accel_closure_callback), callback);
 493         gtk_accel_group_connect(group, accelerator.key, accelerator.modifiers, GTK_ACCEL_VISIBLE, closure);
 494         return closure;
 495     } else {
 496         special_accelerators_add(accelerator, callback);
 497         return 0;
 498     }
 499 }
 500
 501 void accel_group_remove_accelerator(ui::AccelGroup group, Accelerator accelerator)
 502 {
 503     if (accelerator.key != 0 && gtk_accelerator_valid(accelerator.key, accelerator.modifiers)) {
 504         //globalOutputStream() << "global_accel_disconnect: " << makeQuoted(accelerator) << "\n";
 505         gtk_accel_group_disconnect_key(group, accelerator.key, accelerator.modifiers);
 506     } else {
 507         special_accelerators_remove(accelerator);
 508     }
 509 }
 510
 511 ui::AccelGroup global_accel{ui::New};
 512
 513 GClosure *global_accel_group_add_accelerator(Accelerator accelerator, const Callback<void()> &callback)
 514 {
 515     if (!global_accel_enabled()) {
 516         // workaround: cannot add to GtkAccelGroup while it is disabled
 517         //globalOutputStream() << "queued for add: " << accelerator << "\n";
 518         globalQueuedAccelerators_add(accelerator, callback);
 519         return 0;
 520     }
 521     return accel_group_add_accelerator(global_accel, accelerator, callback);
 522 }
 523
 524 void global_accel_group_remove_accelerator(Accelerator accelerator)
 525 {
 526     if (!global_accel_enabled()) {
 527         //globalOutputStream() << "queued for remove: " << accelerator << "\n";
 528         globalQueuedAccelerators_remove(accelerator);
 529         return;
 530     }
 531     accel_group_remove_accelerator(global_accel, accelerator);
 532 }
 533
 534 /// \brief Propagates key events to the focus-widget, overriding global accelerators.
 535 static gboolean override_global_accelerators(ui::Window window, GdkEventKey *event, gpointer data)
 536 {
 537     gboolean b = gtk_window_propagate_key_event(window, event);
 538     return b;
 539 }
 540
 541 void global_accel_connect_window(ui::Window window)
 542 {
 543 #if 1
 544     unsigned int override_handler = window.connect("key_press_event", G_CALLBACK(override_global_accelerators), 0);
 545     g_object_set_data(G_OBJECT(window), "override_handler", gint_to_pointer(override_handler));
 546
 547     unsigned int special_key_press_handler = window.connect("key_press_event", G_CALLBACK(accelerator_key_event),
 548                                                             &g_special_accelerators);
 549     g_object_set_data(G_OBJECT(window), "special_key_press_handler", gint_to_pointer(special_key_press_handler));
 550
 551     GlobalPressedKeys_connect(window);
 552 #else
 553     unsigned int key_press_handler = window.connect( "key_press_event", G_CALLBACK( accelerator_key_event ), &g_keydown_accelerators );
 554     unsigned int key_release_handler = window.connect( "key_release_event", G_CALLBACK( accelerator_key_event ), &g_keyup_accelerators );
 555     g_object_set_data( G_OBJECT( window ), "key_press_handler", gint_to_pointer( key_press_handler ) );
 556     g_object_set_data( G_OBJECT( window ), "key_release_handler", gint_to_pointer( key_release_handler ) );
 557 #endif
 558     g_accel_windows.insert(window);
 559     window.add_accel_group(global_accel);
 560 }
 561
 562 void global_accel_disconnect_window(ui::Window window)
 563 {
 564 #if 1
 565     GlobalPressedKeys_disconnect(window);
 566
 567     g_signal_handler_disconnect(G_OBJECT(window),
 568                                 gpointer_to_int(g_object_get_data(G_OBJECT(window), "override_handler")));
 569     g_signal_handler_disconnect(G_OBJECT(window),
 570                                 gpointer_to_int(g_object_get_data(G_OBJECT(window), "special_key_press_handler")));
 571 #else
 572     g_signal_handler_disconnect( G_OBJECT( window ), gpointer_to_int( g_object_get_data( G_OBJECT( window ), "key_press_handler" ) ) );
 573     g_signal_handler_disconnect( G_OBJECT( window ), gpointer_to_int( g_object_get_data( G_OBJECT( window ), "key_release_handler" ) ) );
 574 #endif
 575     gtk_window_remove_accel_group(window, global_accel);
 576     std::size_t count = g_accel_windows.erase(window);
 577     ASSERT_MESSAGE(count == 1, "failed to remove accel group\n");
 578 }
 579
 580
 581 GClosure *global_accel_group_find(Accelerator accelerator)
 582 {
 583     guint numEntries = 0;
 584     GtkAccelGroupEntry *entry = gtk_accel_group_query(global_accel, accelerator.key, accelerator.modifiers,
 585                                                       &numEntries);
 586     if (numEntries != 0) {
 587         if (numEntries != 1) {
 588             char *name = gtk_accelerator_name(accelerator.key, accelerator.modifiers);
 589             globalErrorStream() << "accelerator already in-use: " << name << "\n";
 590             g_free(name);
 591         }
 592         return entry->closure;
 593     }
 594     return 0;
 595 }
 596
 597 void global_accel_group_connect(const Accelerator &accelerator, const Callback<void()> &callback)
 598 {
 599     if (accelerator.key != 0) {
 600         global_accel_group_add_accelerator(accelerator, callback);
 601     }
 602 }
 603
 604 void global_accel_group_disconnect(const Accelerator &accelerator, const Callback<void()> &callback)
 605 {
 606     if (accelerator.key != 0) {
 607         global_accel_group_remove_accelerator(accelerator);
 608     }
 609 }