4 * Windows and menus need tree structure
6 * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
7 * Written by Pawel W. Olszta, <olszta@sourceforge.net>
8 * Creation date: Sat Dec 18 1999
10 * Permission is hereby granted, free of charge, to any person obtaining a
11 * copy of this software and associated documentation files (the "Software"),
12 * to deal in the Software without restriction, including without limitation
13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
14 * and/or sell copies of the Software, and to permit persons to whom the
15 * Software is furnished to do so, subject to the following conditions:
17 * The above copyright notice and this permission notice shall be included
18 * in all copies or substantial portions of the Software.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
24 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
25 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 #include <GL/freeglut.h>
29 #include "fg_internal.h"
31 /* -- GLOBAL EXPORTS ------------------------------------------------------- */
34 * The SFG_Structure container holds information about windows and menus
35 * created between glutInit() and glutMainLoop() return.
38 SFG_Structure fgStructure = { { NULL, NULL }, /* The list of windows */
39 { NULL, NULL }, /* The list of menus */
40 { NULL, NULL }, /* Windows to Destroy list */
41 NULL, /* The current window */
42 NULL, /* The current menu */
43 NULL, /* The menu OpenGL context */
44 NULL, /* The game mode window */
45 0, /* The current new window ID */
46 0 }; /* The current new menu ID */
49 /* -- PRIVATE FUNCTIONS ---------------------------------------------------- */
51 extern void fgPlatformCreateWindow ( SFG_Window *window );
53 static void fghClearCallBacks( SFG_Window *window )
58 for( i = 0; i < TOTAL_CALLBACKS; ++i )
59 window->CallBacks[ i ] = NULL;
64 * This private function creates, opens and adds to the hierarchy
65 * a freeglut window complete with OpenGL context and stuff...
67 * If parent is set to NULL, the window created will be a topmost one.
69 SFG_Window* fgCreateWindow( SFG_Window* parent, const char* title,
70 GLboolean positionUse, int x, int y,
71 GLboolean sizeUse, int w, int h,
72 GLboolean gameMode, GLboolean isMenu )
74 /* Have the window object created */
75 SFG_Window *window = (SFG_Window *)calloc( sizeof(SFG_Window), 1 );
77 fgPlatformCreateWindow ( window );
79 fghClearCallBacks( window );
81 /* Initialize the object properties */
82 window->ID = ++fgStructure.WindowID;
84 fgListInit( &window->Children );
87 fgListAppend( &parent->Children, &window->Node );
88 window->Parent = parent;
91 fgListAppend( &fgStructure.Windows, &window->Node );
93 /* Set the default mouse cursor and reset the modifiers value */
94 window->State.Cursor = GLUT_CURSOR_INHERIT;
96 window->IsMenu = isMenu;
98 window->State.IgnoreKeyRepeat = GL_FALSE;
99 window->State.KeyRepeating = GL_FALSE;
100 window->State.IsFullscreen = GL_FALSE;
103 * Open the window now. The fgOpenWindow() function is system
104 * dependant, and resides in freeglut_window.c. Uses fgState.
106 fgOpenWindow( window, title, positionUse, x, y, sizeUse, w, h, gameMode,
107 (GLboolean)(parent ? GL_TRUE : GL_FALSE) );
113 * This private function creates a menu and adds it to the menus list
115 SFG_Menu* fgCreateMenu( FGCBMenu menuCallback )
117 int x = 100, y = 100, w = 1, h = 1;
118 SFG_Window *current_window = fgStructure.CurrentWindow;
120 /* Have the menu object created */
121 SFG_Menu* menu = (SFG_Menu *)calloc( sizeof(SFG_Menu), 1 );
123 menu->ParentWindow = NULL;
125 /* Create a window for the menu to reside in. */
127 fgCreateWindow( NULL, "freeglut menu", GL_TRUE, x, y, GL_TRUE, w, h,
129 menu->Window = fgStructure.CurrentWindow;
130 glutDisplayFunc( fgDisplayMenu );
132 glutHideWindow( ); /* Hide the window for now */
133 fgSetWindow( current_window );
135 /* Initialize the object properties: */
136 menu->ID = ++fgStructure.MenuID;
137 menu->Callback = menuCallback;
138 menu->ActiveEntry = NULL;
140 fgListInit( &menu->Entries );
141 fgListAppend( &fgStructure.Menus, &menu->Node );
143 /* Newly created menus implicitly become current ones */
144 fgStructure.CurrentMenu = menu;
150 * Function to add a window to the linked list of windows to destroy.
151 * Subwindows are automatically added because they hang from the window
154 void fgAddToWindowDestroyList( SFG_Window* window )
156 SFG_WindowList *new_list_entry =
157 ( SFG_WindowList* )malloc( sizeof(SFG_WindowList ) );
158 new_list_entry->window = window;
159 fgListAppend( &fgStructure.WindowsToDestroy, &new_list_entry->node );
161 /* Check if the window is the current one... */
162 if( fgStructure.CurrentWindow == window )
163 fgStructure.CurrentWindow = NULL;
166 * Clear all window callbacks except Destroy, which will
167 * be invoked later. Right now, we are potentially carrying
168 * out a freeglut operation at the behest of a client callback,
169 * so we are reluctant to re-enter the client with the Destroy
170 * callback, right now. The others are all wiped out, however,
171 * to ensure that they are no longer called after this point.
174 FGCBDestroy destroy = (FGCBDestroy)FETCH_WCB( *window, Destroy );
175 fghClearCallBacks( window );
176 SET_WCB( *window, Destroy, destroy );
181 * Function to close down all the windows in the "WindowsToDestroy" list
183 void fgCloseWindows( )
185 while( fgStructure.WindowsToDestroy.First )
187 SFG_WindowList *window_ptr = fgStructure.WindowsToDestroy.First;
188 fgDestroyWindow( window_ptr->window );
189 fgListRemove( &fgStructure.WindowsToDestroy, &window_ptr->node );
195 * This function destroys a window and all of its subwindows. Actually,
196 * another function, defined in freeglut_window.c is called, but this is
197 * a whole different story...
199 void fgDestroyWindow( SFG_Window* window )
201 FREEGLUT_INTERNAL_ERROR_EXIT ( window, "Window destroy function called with null window",
204 while( window->Children.First )
205 fgDestroyWindow( ( SFG_Window * )window->Children.First );
208 SFG_Window *activeWindow = fgStructure.CurrentWindow;
209 INVOKE_WCB( *window, Destroy, ( ) );
210 fgSetWindow( activeWindow );
214 fgListRemove( &window->Parent->Children, &window->Node );
216 fgListRemove( &fgStructure.Windows, &window->Node );
218 if( window->ActiveMenu )
219 fgDeactivateMenu( window );
221 fghClearCallBacks( window );
222 fgCloseWindow( window );
224 if( fgStructure.CurrentWindow == window )
225 fgStructure.CurrentWindow = NULL;
229 * This is a helper static function that removes a menu (given its pointer)
230 * from any windows that can be accessed from a given parent...
232 static void fghRemoveMenuFromWindow( SFG_Window* window, SFG_Menu* menu )
234 SFG_Window *subWindow;
237 /* Check whether this is the active menu in the window */
238 if ( menu == window->ActiveMenu )
239 window->ActiveMenu = NULL ;
242 * Check if the menu is attached to the current window,
243 * if so, have it detached (by overwriting with a NULL):
245 for( i = 0; i < FREEGLUT_MAX_MENUS; i++ )
246 if( window->Menu[ i ] == menu )
247 window->Menu[ i ] = NULL;
249 /* Call this function for all of the window's children recursively: */
250 for( subWindow = (SFG_Window *)window->Children.First;
252 subWindow = (SFG_Window *)subWindow->Node.Next)
253 fghRemoveMenuFromWindow( subWindow, menu );
257 * This is a static helper function that removes menu references
258 * from another menu, given two pointers to them...
260 static void fghRemoveMenuFromMenu( SFG_Menu* from, SFG_Menu* menu )
262 SFG_MenuEntry *entry;
264 for( entry = (SFG_MenuEntry *)from->Entries.First;
266 entry = ( SFG_MenuEntry * )entry->Node.Next )
267 if( entry->SubMenu == menu )
268 entry->SubMenu = NULL;
272 * This function destroys a menu specified by the parameter. All menus
273 * and windows are updated to make sure no ill pointers hang around.
275 void fgDestroyMenu( SFG_Menu* menu )
280 FREEGLUT_INTERNAL_ERROR_EXIT ( menu, "Menu destroy function called with null menu",
283 /* First of all, have all references to this menu removed from all windows: */
284 for( window = (SFG_Window *)fgStructure.Windows.First;
286 window = (SFG_Window *)window->Node.Next )
287 fghRemoveMenuFromWindow( window, menu );
289 /* Now proceed with removing menu entries that lead to this menu */
290 for( from = ( SFG_Menu * )fgStructure.Menus.First;
292 from = ( SFG_Menu * )from->Node.Next )
293 fghRemoveMenuFromMenu( from, menu );
296 * If the programmer defined a destroy callback, call it
297 * A. Donev: But first make this the active menu
301 SFG_Menu *activeMenu=fgStructure.CurrentMenu;
302 fgStructure.CurrentMenu = menu;
304 fgStructure.CurrentMenu = activeMenu;
308 * Now we are pretty sure the menu is not used anywhere
309 * and that we can remove all of its entries
311 while( menu->Entries.First )
313 SFG_MenuEntry *entry = ( SFG_MenuEntry * ) menu->Entries.First;
315 fgListRemove( &menu->Entries, &entry->Node );
324 if( fgStructure.CurrentWindow == menu->Window )
326 fgDestroyWindow( menu->Window );
327 fgListRemove( &fgStructure.Menus, &menu->Node );
328 if( fgStructure.CurrentMenu == menu )
329 fgStructure.CurrentMenu = NULL;
335 * This function should be called on glutInit(). It will prepare the internal
336 * structure of freeglut to be used in the application. The structure will be
337 * destroyed using fgDestroyStructure() on glutMainLoop() return. In that
338 * case further use of freeglut should be preceeded with a glutInit() call.
340 void fgCreateStructure( void )
343 * We will be needing two lists: the first containing windows,
344 * and the second containing the user-defined menus.
345 * Also, no current window/menu is set, as none has been created yet.
348 fgListInit(&fgStructure.Windows);
349 fgListInit(&fgStructure.Menus);
350 fgListInit(&fgStructure.WindowsToDestroy);
352 fgStructure.CurrentWindow = NULL;
353 fgStructure.CurrentMenu = NULL;
354 fgStructure.MenuContext = NULL;
355 fgStructure.GameModeWindow = NULL;
356 fgStructure.WindowID = 0;
357 fgStructure.MenuID = 0;
361 * This function is automatically called on glutMainLoop() return.
362 * It should deallocate and destroy all remnants of previous
363 * glutInit()-enforced structure initialization...
365 void fgDestroyStructure( void )
367 /* Clean up the WindowsToDestroy list. */
370 /* Make sure all windows and menus have been deallocated */
371 while( fgStructure.Menus.First )
372 fgDestroyMenu( ( SFG_Menu * )fgStructure.Menus.First );
374 while( fgStructure.Windows.First )
375 fgDestroyWindow( ( SFG_Window * )fgStructure.Windows.First );
379 * Helper function to enumerate through all registered top-level windows
381 void fgEnumWindows( FGCBenumerator enumCallback, SFG_Enumerator* enumerator )
385 FREEGLUT_INTERNAL_ERROR_EXIT ( enumCallback && enumerator,
386 "Enumerator or callback missing from window enumerator call",
389 /* Check every of the top-level windows */
390 for( window = ( SFG_Window * )fgStructure.Windows.First;
392 window = ( SFG_Window * )window->Node.Next )
394 enumCallback( window, enumerator );
395 if( enumerator->found )
401 * Helper function to enumerate through all a window's subwindows
402 * (single level descent)
404 void fgEnumSubWindows( SFG_Window* window, FGCBenumerator enumCallback,
405 SFG_Enumerator* enumerator )
409 FREEGLUT_INTERNAL_ERROR_EXIT ( enumCallback && enumerator,
410 "Enumerator or callback missing from subwindow enumerator call",
411 "fgEnumSubWindows" );
412 FREEGLUT_INTERNAL_ERROR_EXIT_IF_NOT_INITIALISED ( "Window Enumeration" );
414 for( child = ( SFG_Window * )window->Children.First;
416 child = ( SFG_Window * )child->Node.Next )
418 enumCallback( child, enumerator );
419 if( enumerator->found )
425 * A static helper function to look for a window given its handle
427 static void fghcbWindowByHandle( SFG_Window *window,
428 SFG_Enumerator *enumerator )
430 if ( enumerator->found )
433 /* Check the window's handle. Hope this works. Looks ugly. That's for sure. */
434 if( window->Window.Handle == (SFG_WindowHandleType) (enumerator->data) )
436 enumerator->found = GL_TRUE;
437 enumerator->data = window;
442 /* Otherwise, check this window's children */
443 fgEnumSubWindows( window, fghcbWindowByHandle, enumerator );
447 * fgWindowByHandle returns a (SFG_Window *) value pointing to the
448 * first window in the queue matching the specified window handle.
449 * The function is defined in freeglut_structure.c file.
451 SFG_Window* fgWindowByHandle ( SFG_WindowHandleType hWindow )
453 SFG_Enumerator enumerator;
455 /* This is easy and makes use of the windows enumeration defined above */
456 enumerator.found = GL_FALSE;
457 enumerator.data = (void *)hWindow;
458 fgEnumWindows( fghcbWindowByHandle, &enumerator );
460 if( enumerator.found )
461 return( SFG_Window *) enumerator.data;
466 * A static helper function to look for a window given its ID
468 static void fghcbWindowByID( SFG_Window *window, SFG_Enumerator *enumerator )
470 /* Make sure we do not overwrite our precious results... */
471 if( enumerator->found )
474 /* Check the window's handle. Hope this works. Looks ugly. That's for sure. */
475 if( window->ID == *( int *)(enumerator->data) )
477 enumerator->found = GL_TRUE;
478 enumerator->data = window;
483 /* Otherwise, check this window's children */
484 fgEnumSubWindows( window, fghcbWindowByID, enumerator );
488 * This function is similiar to the previous one, except it is
489 * looking for a specified (sub)window identifier. The function
490 * is defined in freeglut_structure.c file.
492 SFG_Window* fgWindowByID( int windowID )
494 SFG_Enumerator enumerator;
496 /* Uses a method very similiar for fgWindowByHandle... */
497 enumerator.found = GL_FALSE;
498 enumerator.data = ( void * )&windowID;
499 fgEnumWindows( fghcbWindowByID, &enumerator );
500 if( enumerator.found )
501 return ( SFG_Window * )enumerator.data;
506 * Looks up a menu given its ID. This is easier that fgWindowByXXX
507 * as all menus are placed in one doubly linked list...
509 SFG_Menu* fgMenuByID( int menuID )
511 SFG_Menu *menu = NULL;
513 /* It's enough to check all entries in fgStructure.Menus... */
514 for( menu = (SFG_Menu *)fgStructure.Menus.First;
516 menu = (SFG_Menu *)menu->Node.Next )
517 if( menu->ID == menuID )
525 void fgListInit(SFG_List *list)
531 void fgListAppend(SFG_List *list, SFG_Node *node)
535 SFG_Node *ln = (SFG_Node *) list->Last;
549 void fgListRemove(SFG_List *list, SFG_Node *node)
552 ( ( SFG_Node * )node->Next )->Prev = node->Prev;
554 ( ( SFG_Node * )node->Prev )->Next = node->Next;
555 if( ( ( SFG_Node * )list->First ) == node )
556 list->First = node->Next;
557 if( ( ( SFG_Node * )list->Last ) == node )
558 list->Last = node->Prev;
561 int fgListLength(SFG_List *list)
566 for( node =( SFG_Node * )list->First;
568 node = ( SFG_Node * )node->Next )
575 void fgListInsert(SFG_List *list, SFG_Node *next, SFG_Node *node)
579 if( (node->Next = next) )
590 if( (node->Prev = prev) )
596 /*** END OF FILE ***/