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
  41 const char* global_keys_find( unsigned int key ){
  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         guint k;
  55         if ( !name || !*name ) {
  56                 return 0;
  57         }
  58         k = gdk_keyval_from_name( name );
  59         if ( k == GDK_KEY_VoidSymbol ) {
  60                 return 0;
  61         }
  62         return k;
  63 }
  64
  65 void accelerator_write( const Accelerator& accelerator, TextOutputStream& ostream ){
  66 #if 0
  67         if ( accelerator.modifiers & GDK_SHIFT_MASK ) {
  68                 ostream << "Shift + ";
  69         }
  70         if ( accelerator.modifiers & GDK_MOD1_MASK ) {
  71                 ostream << "Alt + ";
  72         }
  73         if ( accelerator.modifiers & GDK_CONTROL_MASK ) {
  74                 ostream << "Control + ";
  75         }
  76
  77         const char* keyName = global_keys_find( accelerator.key );
  78         if ( !string_empty( keyName ) ) {
  79                 ostream << keyName;
  80         }
  81         else
  82         {
  83                 ostream << static_cast<char>( accelerator.key );
  84         }
  85 #endif
  86         ostream << gtk_accelerator_get_label( accelerator.key, accelerator.modifiers );
  87 }
  88
  89 typedef std::map<Accelerator, Callback<void()>> AcceleratorMap;
  90 typedef std::set<Accelerator> AcceleratorSet;
  91
  92 bool accelerator_map_insert( AcceleratorMap& acceleratorMap, Accelerator accelerator, const Callback<void()>& callback ){
  93         if ( accelerator.key != 0 ) {
  94                 return acceleratorMap.insert( AcceleratorMap::value_type( accelerator, callback ) ).second;
  95         }
  96         return true;
  97 }
  98
  99 bool accelerator_map_erase( AcceleratorMap& acceleratorMap, Accelerator accelerator ){
 100         if ( accelerator.key != 0 ) {
 101                 AcceleratorMap::iterator i = acceleratorMap.find( accelerator );
 102                 if ( i == acceleratorMap.end() ) {
 103                         return false;
 104                 }
 105                 acceleratorMap.erase( i );
 106         }
 107         return true;
 108 }
 109
 110 Accelerator accelerator_for_event_key( guint keyval, guint state ){
 111         keyval = gdk_keyval_to_upper( keyval );
 112         if ( keyval == GDK_KEY_ISO_Left_Tab ) {
 113                 keyval = GDK_KEY_Tab;
 114         }
 115         return Accelerator( keyval, (GdkModifierType)( state & gtk_accelerator_get_default_mod_mask() ) );
 116 }
 117
 118 bool AcceleratorMap_activate( const AcceleratorMap& acceleratorMap, const Accelerator& accelerator ){
 119         AcceleratorMap::const_iterator i = acceleratorMap.find( accelerator );
 120         if ( i != acceleratorMap.end() ) {
 121                 ( *i ).second();
 122                 return true;
 123         }
 124
 125         return false;
 126 }
 127
 128 static gboolean accelerator_key_event( ui::Window window, GdkEventKey* event, AcceleratorMap* acceleratorMap ){
 129         return AcceleratorMap_activate( *acceleratorMap, accelerator_for_event_key( event->keyval, event->state ) );
 130 }
 131
 132
 133 AcceleratorMap g_special_accelerators;
 134
 135
 136 namespace MouseButton
 137 {
 138 enum
 139 {
 140         Left = 1 << 0,
 141         Right = 1 << 1,
 142         Middle = 1 << 2,
 143 };
 144 }
 145
 146 typedef unsigned int ButtonMask;
 147
 148 void print_buttons( ButtonMask mask ){
 149         globalOutputStream() << "button state: ";
 150         if ( ( mask & MouseButton::Left ) != 0 ) {
 151                 globalOutputStream() << "Left ";
 152         }
 153         if ( ( mask & MouseButton::Right ) != 0 ) {
 154                 globalOutputStream() << "Right ";
 155         }
 156         if ( ( mask & MouseButton::Middle ) != 0 ) {
 157                 globalOutputStream() << "Middle ";
 158         }
 159         globalOutputStream() << "\n";
 160 }
 161
 162 ButtonMask ButtonMask_for_event_button( guint button ){
 163         switch ( button )
 164         {
 165         case 1:
 166                 return MouseButton::Left;
 167         case 2:
 168                 return MouseButton::Middle;
 169         case 3:
 170                 return MouseButton::Right;
 171         }
 172         return 0;
 173 }
 174
 175 bool window_has_accel( ui::Window toplevel ){
 176         return g_slist_length( gtk_accel_groups_from_object( G_OBJECT( toplevel ) ) ) != 0;
 177 }
 178
 179 namespace
 180 {
 181 bool g_accel_enabled = true;
 182 }
 183
 184 bool global_accel_enabled(){
 185         return g_accel_enabled;
 186 }
 187
 188
 189 GClosure* accel_group_add_accelerator(ui::AccelGroup group, Accelerator accelerator, const Callback<void()>& callback );
 190 void accel_group_remove_accelerator(ui::AccelGroup group, Accelerator accelerator );
 191
 192 AcceleratorMap g_queuedAcceleratorsAdd;
 193 AcceleratorSet g_queuedAcceleratorsRemove;
 194
 195 void globalQueuedAccelerators_add( Accelerator accelerator, const Callback<void()>& callback ){
 196         if ( !g_queuedAcceleratorsAdd.insert( AcceleratorMap::value_type( accelerator, callback ) ).second ) {
 197                 globalErrorStream() << "globalQueuedAccelerators_add: accelerator already queued: " << accelerator << "\n";
 198         }
 199 }
 200
 201 void globalQueuedAccelerators_remove( Accelerator accelerator ){
 202         if ( g_queuedAcceleratorsAdd.erase( accelerator ) == 0 ) {
 203                 if ( !g_queuedAcceleratorsRemove.insert( accelerator ).second ) {
 204                         globalErrorStream() << "globalQueuedAccelerators_remove: accelerator already queued: " << accelerator << "\n";
 205                 }
 206         }
 207 }
 208
 209 void globalQueuedAccelerators_commit(){
 210         for ( AcceleratorSet::const_iterator i = g_queuedAcceleratorsRemove.begin(); i != g_queuedAcceleratorsRemove.end(); ++i )
 211         {
 212                 //globalOutputStream() << "removing: " << (*i).first << "\n";
 213                 accel_group_remove_accelerator( global_accel, *i );
 214         }
 215         g_queuedAcceleratorsRemove.clear();
 216         for ( AcceleratorMap::const_iterator i = g_queuedAcceleratorsAdd.begin(); i != g_queuedAcceleratorsAdd.end(); ++i )
 217         {
 218                 //globalOutputStream() << "adding: " << (*i).first << "\n";
 219                 accel_group_add_accelerator( global_accel, ( *i ).first, ( *i ).second );
 220         }
 221         g_queuedAcceleratorsAdd.clear();
 222 }
 223
 224 typedef std::set<ui::Window> WindowSet;
 225 WindowSet g_accel_windows;
 226
 227 bool Buttons_press( ButtonMask& buttons, guint button, guint state ){
 228         if ( buttons == 0 && bitfield_enable( buttons, ButtonMask_for_event_button( button ) ) != 0 ) {
 229                 ASSERT_MESSAGE( g_accel_enabled, "Buttons_press: accelerators not enabled" );
 230                 g_accel_enabled = false;
 231                 for ( WindowSet::iterator i = g_accel_windows.begin(); i != g_accel_windows.end(); ++i )
 232                 {
 233                         ui::Window toplevel = *i;
 234                         ASSERT_MESSAGE( window_has_accel( toplevel ), "ERROR" );
 235                         ASSERT_MESSAGE( gtk_widget_is_toplevel( toplevel ), "disabling accel for non-toplevel window" );
 236                         gtk_window_remove_accel_group( toplevel,  global_accel );
 237 #if 0
 238                         globalOutputStream() << reinterpret_cast<unsigned int>( toplevel ) << ": disabled global accelerators\n";
 239 #endif
 240                 }
 241         }
 242         buttons = bitfield_enable( buttons, ButtonMask_for_event_button( button ) );
 243 #if 0
 244         globalOutputStream() << "Buttons_press: ";
 245         print_buttons( buttons );
 246 #endif
 247         return false;
 248 }
 249
 250 bool Buttons_release( ButtonMask& buttons, guint button, guint state ){
 251         if ( buttons != 0 && bitfield_disable( buttons, ButtonMask_for_event_button( button ) ) == 0 ) {
 252                 ASSERT_MESSAGE( !g_accel_enabled, "Buttons_release: accelerators are enabled" );
 253                 g_accel_enabled = true;
 254                 for ( WindowSet::iterator i = g_accel_windows.begin(); i != g_accel_windows.end(); ++i )
 255                 {
 256                         ui::Window toplevel = *i;
 257                         ASSERT_MESSAGE( !window_has_accel( toplevel ), "ERROR" );
 258                         ASSERT_MESSAGE( gtk_widget_is_toplevel( toplevel ), "enabling accel for non-toplevel window" );
 259                         toplevel.add_accel_group( global_accel );
 260 #if 0
 261                         globalOutputStream() << reinterpret_cast<unsigned int>( toplevel ) << ": enabled global accelerators\n";
 262 #endif
 263                 }
 264                 globalQueuedAccelerators_commit();
 265         }
 266         buttons = bitfield_disable( buttons, ButtonMask_for_event_button( button ) );
 267 #if 0
 268         globalOutputStream() << "Buttons_release: ";
 269         print_buttons( buttons );
 270 #endif
 271         return false;
 272 }
 273
 274 bool Buttons_releaseAll( ButtonMask& buttons ){
 275         Buttons_release( buttons, MouseButton::Left | MouseButton::Middle | MouseButton::Right, 0 );
 276         return false;
 277 }
 278
 279 struct PressedButtons
 280 {
 281         ButtonMask buttons;
 282
 283         PressedButtons() : buttons( 0 ){
 284         }
 285 };
 286
 287 gboolean PressedButtons_button_press(ui::Widget widget, GdkEventButton* event, PressedButtons* pressed ){
 288         if ( event->type == GDK_BUTTON_PRESS ) {
 289                 return Buttons_press( pressed->buttons, event->button, event->state );
 290         }
 291         return FALSE;
 292 }
 293
 294 gboolean PressedButtons_button_release(ui::Widget widget, GdkEventButton* event, PressedButtons* pressed ){
 295         if ( event->type == GDK_BUTTON_RELEASE ) {
 296                 return Buttons_release( pressed->buttons, event->button, event->state );
 297         }
 298         return FALSE;
 299 }
 300
 301 gboolean PressedButtons_focus_out(ui::Widget widget, GdkEventFocus* event, PressedButtons* pressed ){
 302         Buttons_releaseAll( pressed->buttons );
 303         return FALSE;
 304 }
 305
 306 void PressedButtons_connect( PressedButtons& pressedButtons, ui::Widget widget ){
 307         widget.connect( "button_press_event", G_CALLBACK( PressedButtons_button_press ), &pressedButtons );
 308         widget.connect( "button_release_event", G_CALLBACK( PressedButtons_button_release ), &pressedButtons );
 309         widget.connect( "focus_out_event", G_CALLBACK( PressedButtons_focus_out ), &pressedButtons );
 310 }
 311
 312 PressedButtons g_pressedButtons;
 313
 314
 315 #include <set>
 316 #include <uilib/uilib.h>
 317
 318 struct PressedKeys
 319 {
 320         typedef std::set<guint> Keys;
 321         Keys keys;
 322         std::size_t refcount;
 323
 324         PressedKeys() : refcount( 0 ){
 325         }
 326 };
 327
 328 AcceleratorMap g_keydown_accelerators;
 329 AcceleratorMap g_keyup_accelerators;
 330
 331 bool Keys_press( PressedKeys::Keys& keys, guint keyval ){
 332         if ( keys.insert( keyval ).second ) {
 333                 return AcceleratorMap_activate( g_keydown_accelerators, accelerator_for_event_key( keyval, 0 ) );
 334         }
 335         return g_keydown_accelerators.find( accelerator_for_event_key( keyval, 0 ) ) != g_keydown_accelerators.end();
 336 }
 337
 338 bool Keys_release( PressedKeys::Keys& keys, guint keyval ){
 339         if ( keys.erase( keyval ) != 0 ) {
 340                 return AcceleratorMap_activate( g_keyup_accelerators, accelerator_for_event_key( keyval, 0 ) );
 341         }
 342         return g_keyup_accelerators.find( accelerator_for_event_key( keyval, 0 ) ) != g_keyup_accelerators.end();
 343 }
 344
 345 void Keys_releaseAll( PressedKeys::Keys& keys, guint state ){
 346         for ( PressedKeys::Keys::iterator i = keys.begin(); i != keys.end(); ++i )
 347         {
 348                 AcceleratorMap_activate( g_keyup_accelerators, accelerator_for_event_key( *i, state ) );
 349         }
 350         keys.clear();
 351 }
 352
 353 gboolean PressedKeys_key_press(ui::Widget widget, GdkEventKey* event, PressedKeys* pressedKeys ){
 354         //globalOutputStream() << "pressed: " << event->keyval << "\n";
 355         //return event->state == 0 && Keys_press( pressedKeys->keys, event->keyval );
 356         //NumLock perspective window fix
 357         return ( event->state & ALLOWED_MODIFIERS ) == 0 && Keys_press( pressedKeys->keys, event->keyval );
 358 }
 359
 360 gboolean PressedKeys_key_release(ui::Widget widget, GdkEventKey* event, PressedKeys* pressedKeys ){
 361         //globalOutputStream() << "released: " << event->keyval << "\n";
 362         return Keys_release( pressedKeys->keys, event->keyval );
 363 }
 364
 365 gboolean PressedKeys_focus_in(ui::Widget widget, GdkEventFocus* event, PressedKeys* pressedKeys ){
 366         ++pressedKeys->refcount;
 367         return FALSE;
 368 }
 369
 370 gboolean PressedKeys_focus_out(ui::Widget widget, GdkEventFocus* event, PressedKeys* pressedKeys ){
 371         if ( --pressedKeys->refcount == 0 ) {
 372                 Keys_releaseAll( pressedKeys->keys, 0 );
 373         }
 374         return FALSE;
 375 }
 376
 377 PressedKeys g_pressedKeys;
 378
 379 void GlobalPressedKeys_releaseAll(){
 380         Keys_releaseAll( g_pressedKeys.keys, 0 );
 381 }
 382
 383 void GlobalPressedKeys_connect( ui::Window window ){
 384         unsigned int key_press_handler = window.connect( "key_press_event", G_CALLBACK( PressedKeys_key_press ), &g_pressedKeys );
 385         unsigned int key_release_handler = window.connect( "key_release_event", G_CALLBACK( PressedKeys_key_release ), &g_pressedKeys );
 386         g_object_set_data( G_OBJECT( window ), "key_press_handler", gint_to_pointer( key_press_handler ) );
 387         g_object_set_data( G_OBJECT( window ), "key_release_handler", gint_to_pointer( key_release_handler ) );
 388         unsigned int focus_in_handler = window.connect( "focus_in_event", G_CALLBACK( PressedKeys_focus_in ), &g_pressedKeys );
 389         unsigned int focus_out_handler = window.connect( "focus_out_event", G_CALLBACK( PressedKeys_focus_out ), &g_pressedKeys );
 390         g_object_set_data( G_OBJECT( window ), "focus_in_handler", gint_to_pointer( focus_in_handler ) );
 391         g_object_set_data( G_OBJECT( window ), "focus_out_handler", gint_to_pointer( focus_out_handler ) );
 392 }
 393
 394 void GlobalPressedKeys_disconnect( ui::Window window ){
 395         g_signal_handler_disconnect( G_OBJECT( window ), gpointer_to_int( g_object_get_data( G_OBJECT( window ), "key_press_handler" ) ) );
 396         g_signal_handler_disconnect( G_OBJECT( window ), gpointer_to_int( g_object_get_data( G_OBJECT( window ), "key_release_handler" ) ) );
 397         g_signal_handler_disconnect( G_OBJECT( window ), gpointer_to_int( g_object_get_data( G_OBJECT( window ), "focus_in_handler" ) ) );
 398         g_signal_handler_disconnect( G_OBJECT( window ), gpointer_to_int( g_object_get_data( G_OBJECT( window ), "focus_out_handler" ) ) );
 399 }
 400
 401
 402
 403 void special_accelerators_add( Accelerator accelerator, const Callback<void()>& callback ){
 404         //globalOutputStream() << "special_accelerators_add: " << makeQuoted(accelerator) << "\n";
 405         if ( !accelerator_map_insert( g_special_accelerators, accelerator, callback ) ) {
 406                 globalErrorStream() << "special_accelerators_add: already exists: " << makeQuoted( accelerator ) << "\n";
 407         }
 408 }
 409 void special_accelerators_remove( Accelerator accelerator ){
 410         //globalOutputStream() << "special_accelerators_remove: " << makeQuoted(accelerator) << "\n";
 411         if ( !accelerator_map_erase( g_special_accelerators, accelerator ) ) {
 412                 globalErrorStream() << "special_accelerators_remove: not found: " << makeQuoted( accelerator ) << "\n";
 413         }
 414 }
 415
 416 void keydown_accelerators_add( Accelerator accelerator, const Callback<void()>& callback ){
 417         //globalOutputStream() << "keydown_accelerators_add: " << makeQuoted(accelerator) << "\n";
 418         if ( !accelerator_map_insert( g_keydown_accelerators, accelerator, callback ) ) {
 419                 globalErrorStream() << "keydown_accelerators_add: already exists: " << makeQuoted( accelerator ) << "\n";
 420         }
 421 }
 422 void keydown_accelerators_remove( Accelerator accelerator ){
 423         //globalOutputStream() << "keydown_accelerators_remove: " << makeQuoted(accelerator) << "\n";
 424         if ( !accelerator_map_erase( g_keydown_accelerators, accelerator ) ) {
 425                 globalErrorStream() << "keydown_accelerators_remove: not found: " << makeQuoted( accelerator ) << "\n";
 426         }
 427 }
 428
 429 void keyup_accelerators_add( Accelerator accelerator, const Callback<void()>& callback ){
 430         //globalOutputStream() << "keyup_accelerators_add: " << makeQuoted(accelerator) << "\n";
 431         if ( !accelerator_map_insert( g_keyup_accelerators, accelerator, callback ) ) {
 432                 globalErrorStream() << "keyup_accelerators_add: already exists: " << makeQuoted( accelerator ) << "\n";
 433         }
 434 }
 435 void keyup_accelerators_remove( Accelerator accelerator ){
 436         //globalOutputStream() << "keyup_accelerators_remove: " << makeQuoted(accelerator) << "\n";
 437         if ( !accelerator_map_erase( g_keyup_accelerators, accelerator ) ) {
 438                 globalErrorStream() << "keyup_accelerators_remove: not found: " << makeQuoted( accelerator ) << "\n";
 439         }
 440 }
 441
 442
 443 gboolean accel_closure_callback(ui::AccelGroup group, ui::Widget widget, guint key, GdkModifierType modifiers, gpointer data ){
 444         ( *reinterpret_cast<Callback<void()>*>( data ) )( );
 445         return TRUE;
 446 }
 447
 448 GClosure* accel_group_add_accelerator(ui::AccelGroup group, Accelerator accelerator, const Callback<void()>& callback ){
 449         if ( accelerator.key != 0 && gtk_accelerator_valid( accelerator.key, accelerator.modifiers ) ) {
 450                 //globalOutputStream() << "global_accel_connect: " << makeQuoted(accelerator) << "\n";
 451                 GClosure* closure = create_cclosure( G_CALLBACK( accel_closure_callback ), callback );
 452                 gtk_accel_group_connect( group, accelerator.key, accelerator.modifiers, GTK_ACCEL_VISIBLE, closure );
 453                 return closure;
 454         }
 455         else
 456         {
 457                 special_accelerators_add( accelerator, callback );
 458                 return 0;
 459         }
 460 }
 461
 462 void accel_group_remove_accelerator(ui::AccelGroup group, Accelerator accelerator ){
 463         if ( accelerator.key != 0 && gtk_accelerator_valid( accelerator.key, accelerator.modifiers ) ) {
 464                 //globalOutputStream() << "global_accel_disconnect: " << makeQuoted(accelerator) << "\n";
 465                 gtk_accel_group_disconnect_key( group, accelerator.key, accelerator.modifiers );
 466         }
 467         else
 468         {
 469                 special_accelerators_remove( accelerator );
 470         }
 471 }
 472
 473 ui::AccelGroup global_accel{ui::New};
 474
 475 GClosure* global_accel_group_add_accelerator( Accelerator accelerator, const Callback<void()>& callback ){
 476         if ( !global_accel_enabled() ) {
 477                 // workaround: cannot add to GtkAccelGroup while it is disabled
 478                 //globalOutputStream() << "queued for add: " << accelerator << "\n";
 479                 globalQueuedAccelerators_add( accelerator, callback );
 480                 return 0;
 481         }
 482         return accel_group_add_accelerator( global_accel, accelerator, callback );
 483 }
 484 void global_accel_group_remove_accelerator( Accelerator accelerator ){
 485         if ( !global_accel_enabled() ) {
 486                 //globalOutputStream() << "queued for remove: " << accelerator << "\n";
 487                 globalQueuedAccelerators_remove( accelerator );
 488                 return;
 489         }
 490         accel_group_remove_accelerator( global_accel, accelerator );
 491 }
 492
 493 /// \brief Propagates key events to the focus-widget, overriding global accelerators.
 494 static gboolean override_global_accelerators( ui::Window window, GdkEventKey* event, gpointer data ){
 495         gboolean b = gtk_window_propagate_key_event( window, event );
 496         return b;
 497 }
 498
 499 void global_accel_connect_window( ui::Window window ){
 500 #if 1
 501         unsigned int override_handler = window.connect( "key_press_event", G_CALLBACK( override_global_accelerators ), 0 );
 502         g_object_set_data( G_OBJECT( window ), "override_handler", gint_to_pointer( override_handler ) );
 503
 504         unsigned int special_key_press_handler = window.connect( "key_press_event", G_CALLBACK( accelerator_key_event ), &g_special_accelerators );
 505         g_object_set_data( G_OBJECT( window ), "special_key_press_handler", gint_to_pointer( special_key_press_handler ) );
 506
 507         GlobalPressedKeys_connect( window );
 508 #else
 509         unsigned int key_press_handler = window.connect( "key_press_event", G_CALLBACK( accelerator_key_event ), &g_keydown_accelerators );
 510         unsigned int key_release_handler = window.connect( "key_release_event", G_CALLBACK( accelerator_key_event ), &g_keyup_accelerators );
 511         g_object_set_data( G_OBJECT( window ), "key_press_handler", gint_to_pointer( key_press_handler ) );
 512         g_object_set_data( G_OBJECT( window ), "key_release_handler", gint_to_pointer( key_release_handler ) );
 513 #endif
 514         g_accel_windows.insert( window );
 515         window.add_accel_group( global_accel );
 516 }
 517 void global_accel_disconnect_window( ui::Window window ){
 518 #if 1
 519         GlobalPressedKeys_disconnect( window );
 520
 521         g_signal_handler_disconnect( G_OBJECT( window ), gpointer_to_int( g_object_get_data( G_OBJECT( window ), "override_handler" ) ) );
 522         g_signal_handler_disconnect( G_OBJECT( window ), gpointer_to_int( g_object_get_data( G_OBJECT( window ), "special_key_press_handler" ) ) );
 523 #else
 524         g_signal_handler_disconnect( G_OBJECT( window ), gpointer_to_int( g_object_get_data( G_OBJECT( window ), "key_press_handler" ) ) );
 525         g_signal_handler_disconnect( G_OBJECT( window ), gpointer_to_int( g_object_get_data( G_OBJECT( window ), "key_release_handler" ) ) );
 526 #endif
 527         gtk_window_remove_accel_group( window, global_accel );
 528         std::size_t count = g_accel_windows.erase( window );
 529         ASSERT_MESSAGE( count == 1, "failed to remove accel group\n" );
 530 }
 531
 532
 533 GClosure* global_accel_group_find( Accelerator accelerator ){
 534         guint numEntries = 0;
 535         GtkAccelGroupEntry* entry = gtk_accel_group_query( global_accel, accelerator.key, accelerator.modifiers, &numEntries );
 536         if ( numEntries != 0 ) {
 537                 if ( numEntries != 1 ) {
 538                         char* name = gtk_accelerator_name( accelerator.key, accelerator.modifiers );
 539                         globalErrorStream() << "accelerator already in-use: " << name << "\n";
 540                         g_free( name );
 541                 }
 542                 return entry->closure;
 543         }
 544         return 0;
 545 }
 546
 547 void global_accel_group_connect( const Accelerator& accelerator, const Callback<void()>& callback ){
 548         if ( accelerator.key != 0 ) {
 549                 global_accel_group_add_accelerator( accelerator, callback );
 550         }
 551 }
 552
 553 void global_accel_group_disconnect( const Accelerator& accelerator, const Callback<void()>& callback ){
 554         if ( accelerator.key != 0 ) {
 555                 global_accel_group_remove_accelerator( accelerator );
 556         }
 557 }