4 * Pull-down menu creation and handling.
6 * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
7 * Written by Pawel W. Olszta, <olszta@sourceforge.net>
8 * Creation date: Thu Dec 16 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.
32 #include <GL/freeglut.h>
33 #include "freeglut_internal.h"
35 /* -- DEFINITIONS ---------------------------------------------------------- */
38 * FREEGLUT_MENU_FONT can be any freeglut bitmapped font.
39 * (Stroked fonts would not be out of the question, but we'd need to alter
40 * code, since GLUT (hence freeglut) does not quite unify stroked and
41 * bitmapped font handling.)
42 * Old UNIX/X11 GLUT (BSD, UNIX, IRIX, LINUX, HPUX, ...) used a system
43 * font best approximated by an 18-pixel HELVETICA, I think. MS-WINDOWS
44 * GLUT used something closest to the 8x13 fixed-width font. (Old
45 * GLUT apparently uses host-system menus rather than building its own.
46 * freeglut is building its own menus from scratch.)
48 * FREEGLUT_MENU_HEIGHT gives the height of ONE menu box. This should be
49 * the distances between two adjacent menu entries. It should scale
50 * automatically with the font choice, so you needn't alter it---unless you
53 * FREEGLUT_MENU_BORDER says how many pixels to allow around the edge of a
54 * menu. (It also seems to be the same as the number of pixels used as
55 * a border around *items* to separate them from neighbors. John says
56 * that that wasn't the original intent...if not, perhaps we need another
57 * symbolic constant, FREEGLUT_MENU_ITEM_BORDER, or such.)
59 #if TARGET_HOST_WIN32 || TARGET_HOST_WINCE
60 #define FREEGLUT_MENU_FONT GLUT_BITMAP_8_BY_13
62 #define FREEGLUT_MENU_FONT GLUT_BITMAP_HELVETICA_18
65 #define FREEGLUT_MENU_HEIGHT (glutBitmapHeight(FREEGLUT_MENU_FONT) + \
67 #define FREEGLUT_MENU_BORDER 2
71 * These variables are for rendering the freeglut menu items.
73 * The choices are fore- and background, with and without h for Highlighting.
74 * Old GLUT appeared to be system-dependant for its colors (sigh) so we are
75 * too. These variables should be stuffed into global state and initialized
76 * via the glutInit*() system.
78 #if TARGET_HOST_WIN32 || TARGET_HOST_WINCE
79 static float menu_pen_fore [4] = {0.0f, 0.0f, 0.0f, 1.0f};
80 static float menu_pen_back [4] = {0.85f, 0.85f, 0.85f, 1.0f};
81 static float menu_pen_hfore [4] = {1.0f, 1.0f, 1.0f, 1.0f};
82 static float menu_pen_hback [4] = {0.15f, 0.15f, 0.45f, 1.0f};
84 static float menu_pen_fore [4] = {0.0f, 0.0f, 0.0f, 1.0f};
85 static float menu_pen_back [4] = {0.70f, 0.70f, 0.70f, 1.0f};
86 static float menu_pen_hfore [4] = {0.0f, 0.0f, 0.0f, 1.0f};
87 static float menu_pen_hback [4] = {1.0f, 1.0f, 1.0f, 1.0f};
90 /* -- PRIVATE FUNCTIONS ---------------------------------------------------- */
93 * Private function to find a menu entry by index
95 static SFG_MenuEntry *fghFindMenuEntry( SFG_Menu* menu, int index )
100 for( entry = (SFG_MenuEntry *)menu->Entries.First;
102 entry = (SFG_MenuEntry *)entry->Node.Next )
113 * Private function to check for the current menu/sub menu activity state
115 static GLboolean fghCheckMenuStatus( SFG_Window* window, SFG_Menu* menu )
117 SFG_MenuEntry* menuEntry;
121 * First of all check any of the active sub menus...
123 for( menuEntry = (SFG_MenuEntry *)menu->Entries.First;
125 menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
127 if( menuEntry->SubMenu && menuEntry->IsActive )
130 * OK, have the sub-menu checked, too. If it returns GL_TRUE, it
131 * will mean that it caught the mouse cursor and we do not need
132 * to regenerate the activity list, and so our parents do...
134 GLboolean return_status = fghCheckMenuStatus( window,
135 menuEntry->SubMenu );
138 * Reactivate the submenu as the checkMenuStatus may have turned
139 * it off if the mouse is in its parent menu entry.
141 menuEntry->SubMenu->IsActive = GL_TRUE;
148 * That much about our sub menus, let's get to checking the current menu:
150 x = window->State.MouseX;
151 y = window->State.MouseY;
153 for( menuEntry = (SFG_MenuEntry *)menu->Entries.First;
155 menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
156 menuEntry->IsActive = GL_FALSE;
158 menu->IsActive = GL_FALSE;
161 * Check if the mouse cursor is contained within the current menu box
163 if( ( x >= FREEGLUT_MENU_BORDER ) &&
164 ( x < menu->Width - FREEGLUT_MENU_BORDER ) &&
165 ( y >= FREEGLUT_MENU_BORDER ) &&
166 ( y < menu->Height - FREEGLUT_MENU_BORDER ) &&
167 ( window == menu->Window ) )
169 int menuID = ( y - FREEGLUT_MENU_BORDER ) / FREEGLUT_MENU_HEIGHT;
172 * The mouse cursor is somewhere over our box, check it out.
174 menuEntry = fghFindMenuEntry( menu, menuID + 1 );
177 menuEntry->IsActive = GL_TRUE;
178 menuEntry->Ordinal = menuID;
181 * If this is not the same as the last active menu entry, deactivate
182 * the previous entry. Specifically, if the previous active entry
183 * was a submenu then deactivate it.
185 if( menu->ActiveEntry && ( menuEntry != menu->ActiveEntry ) )
186 if( menu->ActiveEntry->SubMenu )
187 fgDeactivateSubMenu( menu->ActiveEntry );
189 menu->ActiveEntry = menuEntry;
190 menu->IsActive = GL_TRUE;
193 * OKi, we have marked that entry as active, but it would be also
194 * nice to have its contents updated, in case it's a sub menu.
195 * Also, ignore the return value of the check function:
197 if( menuEntry->SubMenu )
199 if ( ! menuEntry->SubMenu->IsActive )
201 SFG_Window *current_window = fgStructure.Window;
204 * Set up the initial menu position now...
206 menuEntry->SubMenu->IsActive = GL_TRUE;
209 * Set up the initial submenu position now:
211 menuEntry->SubMenu->X = menu->X + menu->Width;
212 menuEntry->SubMenu->Y = menu->Y +
213 menuEntry->Ordinal * FREEGLUT_MENU_HEIGHT;
215 if( menuEntry->SubMenu->X + menuEntry->SubMenu->Width >
216 glutGet( GLUT_SCREEN_WIDTH ) )
217 menuEntry->SubMenu->X = menu->X -
218 menuEntry->SubMenu->Width;
220 if( menuEntry->SubMenu->Y + menuEntry->SubMenu->Height >
221 glutGet( GLUT_SCREEN_HEIGHT ) )
222 menuEntry->SubMenu->Y -= ( menuEntry->SubMenu->Height -
223 FREEGLUT_MENU_HEIGHT -
224 2 * FREEGLUT_MENU_BORDER );
226 fgSetWindow( menuEntry->SubMenu->Window );
227 glutPositionWindow( menuEntry->SubMenu->X,
228 menuEntry->SubMenu->Y );
229 glutReshapeWindow( menuEntry->SubMenu->Width,
230 menuEntry->SubMenu->Height );
233 menuEntry->SubMenu->Window->ActiveMenu = menuEntry->SubMenu;
234 fgSetWindow( current_window );
237 fghCheckMenuStatus( window, menuEntry->SubMenu );
240 * Activate it because its parent entry is active
242 menuEntry->SubMenu->IsActive = GL_TRUE;
246 * Report back that we have caught the menu cursor
252 * Looks like the menu cursor is somewhere else...
258 * Displays a menu box and all of its submenus (if they are active)
260 static void fghDisplayMenuBox( SFG_Menu* menu )
262 SFG_MenuEntry *menuEntry;
264 int border = FREEGLUT_MENU_BORDER;
267 * Have the menu box drawn first. The +- values are
268 * here just to make it more nice-looking...
270 /* a non-black dark version of the below. */
271 glColor4f( 1.0f, 1.0f, 1.0f, 1.0f );
272 glBegin( GL_QUAD_STRIP );
273 glVertex2i( menu->Width , 0 );
274 glVertex2i( menu->Width - border, border);
276 glVertex2i( border, border);
277 glVertex2i( 0 , menu->Height );
278 glVertex2i( border, menu->Height - border);
281 /* a non-black dark version of the below. */
282 glColor4f( 0.5f, 0.5f, 0.5f, 1.0f );
283 glBegin( GL_QUAD_STRIP );
284 glVertex2i( 0 , menu->Height );
285 glVertex2i( border, menu->Height - border);
286 glVertex2i( menu->Width , menu->Height );
287 glVertex2i( menu->Width - border, menu->Height - border);
288 glVertex2i( menu->Width , 0 );
289 glVertex2i( menu->Width - border, border);
292 glColor4fv( menu_pen_back );
294 glVertex2i( border, border);
295 glVertex2i( menu->Width - border, border);
296 glVertex2i( menu->Width - border, menu->Height - border);
297 glVertex2i( border, menu->Height - border);
301 * Check if any of the submenus is currently active...
303 for( menuEntry = (SFG_MenuEntry *)menu->Entries.First;
305 menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
308 * Has the menu been marked as active, maybe?
310 if( menuEntry->IsActive )
313 * That's truly right, and we need to have it highlighted.
314 * There is an assumption that mouse cursor didn't move
315 * since the last check of menu activity state:
317 int menuID = menuEntry->Ordinal;
320 * So have the highlight drawn...
322 glColor4fv( menu_pen_hback );
325 (menuID + 0)*FREEGLUT_MENU_HEIGHT + border );
326 glVertex2i( menu->Width - border,
327 (menuID + 0)*FREEGLUT_MENU_HEIGHT + border );
328 glVertex2i( menu->Width - border,
329 (menuID + 1)*FREEGLUT_MENU_HEIGHT + border );
331 (menuID + 1)*FREEGLUT_MENU_HEIGHT + border );
337 * Print the menu entries now...
340 glColor4fv( menu_pen_fore );
342 for( menuEntry = (SFG_MenuEntry *)menu->Entries.First, i = 0;
344 menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next, ++i )
347 * If the menu entry is active, set the color to white
349 if( menuEntry->IsActive )
350 glColor4fv( menu_pen_hfore );
353 * Move the raster into position...
355 /* Try to center the text - JCJ 31 July 2003*/
358 ( i + 1 )*FREEGLUT_MENU_HEIGHT -
359 ( int )( FREEGLUT_MENU_HEIGHT*0.3 - border )
363 * Have the label drawn, character after character:
365 glutBitmapString( FREEGLUT_MENU_FONT,
366 (unsigned char *)menuEntry->Text);
369 * If it's a submenu, draw a right arrow
371 if( menuEntry->SubMenu )
373 int width = glutBitmapWidth( FREEGLUT_MENU_FONT, '_' );
374 int x_base = menu->Width - 2 - width;
375 int y_base = i*FREEGLUT_MENU_HEIGHT + border;
376 glBegin( GL_TRIANGLES );
377 glVertex2i( x_base, y_base + 2*border);
378 glVertex2i( menu->Width - 2, y_base +
379 ( FREEGLUT_MENU_HEIGHT + border) / 2 );
380 glVertex2i( x_base, y_base + FREEGLUT_MENU_HEIGHT - border );
385 * If the menu entry is active, reset the color
387 if( menuEntry->IsActive )
388 glColor4fv( menu_pen_fore );
392 * Now we are ready to check if any of our children needs to be redrawn:
394 for( menuEntry = ( SFG_MenuEntry * )menu->Entries.First;
396 menuEntry = ( SFG_MenuEntry * )menuEntry->Node.Next )
399 * Is that an active sub menu by any case?
401 if( menuEntry->SubMenu && menuEntry->IsActive )
404 * Yeah, indeed. Have it redrawn now:
406 fgSetWindow( menuEntry->SubMenu->Window );
407 fghDisplayMenuBox( menuEntry->SubMenu );
408 fgSetWindow( menu->Window );
414 * Private static function to set the parent window of a submenu and all
417 static void fghSetSubmenuParentWindow( SFG_Window *window, SFG_Menu *menu )
419 SFG_MenuEntry *menuEntry;
421 menu->ParentWindow = window;
423 for( menuEntry = ( SFG_MenuEntry * )menu->Entries.First;
425 menuEntry = ( SFG_MenuEntry * )menuEntry->Node.Next )
426 if( menuEntry->SubMenu )
427 fghSetSubmenuParentWindow( window, menuEntry->SubMenu );
432 * Displays the currently active menu for the current window
434 void fgDisplayMenu( void )
436 SFG_Window* window = fgStructure.Window;
437 SFG_Menu* menu = NULL;
439 freeglut_assert_window;
442 * Check if there is an active menu attached to this window...
444 menu = window->ActiveMenu;
445 freeglut_return_if_fail( menu );
447 fgSetWindow( menu->Window );
449 glPushAttrib( GL_DEPTH_BUFFER_BIT | GL_TEXTURE_BIT | GL_LIGHTING_BIT |
452 glDisable( GL_DEPTH_TEST );
453 glDisable( GL_TEXTURE_2D );
454 glDisable( GL_LIGHTING );
455 glDisable( GL_CULL_FACE );
457 glMatrixMode( GL_PROJECTION );
461 0, glutGet( GLUT_WINDOW_WIDTH ),
462 glutGet( GLUT_WINDOW_HEIGHT ), 0,
466 glMatrixMode( GL_MODELVIEW );
470 fghCheckMenuStatus( window, menu );
471 fghDisplayMenuBox( menu );
475 glMatrixMode( GL_PROJECTION );
477 glMatrixMode( GL_MODELVIEW );
482 fgSetWindow ( window );
486 * Activates a menu pointed by the function argument
488 void fgActivateMenu( SFG_Window* window, int button )
491 * We'll be referencing this menu a lot, so remember its address:
493 SFG_Menu* menu = window->Menu[ button ];
496 * Mark the menu as active, so that it gets displayed:
498 window->ActiveMenu = menu;
499 menu->IsActive = GL_TRUE;
500 fgState.ActiveMenus++;
503 * Set up the initial menu position now:
505 menu->X = window->State.MouseX + glutGet( GLUT_WINDOW_X );
506 menu->Y = window->State.MouseY + glutGet( GLUT_WINDOW_Y );
508 if( menu->X + menu->Width > glutGet ( GLUT_SCREEN_WIDTH ) )
509 menu->X -=menu->Width;
511 if( menu->Y + menu->Height > glutGet ( GLUT_SCREEN_HEIGHT ) )
512 menu->Y -=menu->Height;
514 fgSetWindow( menu->Window );
515 glutPositionWindow( menu->X, menu->Y );
516 glutReshapeWindow( menu->Width, menu->Height );
519 menu->Window->ActiveMenu = menu;
523 * Check whether an active menu absorbs a mouse click
525 GLboolean fgCheckActiveMenu ( SFG_Window *window, SFG_Menu *menu )
528 * Near as I can tell, this is the active menu behaviour:
529 * - Down-click any button outside the menu, menu active:
530 * deactivate the menu
531 * - Down-click any button inside the menu, menu active:
532 * select the menu entry and deactivate the menu
533 * - Up-click the menu button outside the menu, menu active:
535 * - Up-click the menu button inside the menu, menu active:
536 * select the menu entry and deactivate the menu
537 * Since menus can have submenus, we need to check this recursively.
539 return fghCheckMenuStatus( window, menu );
543 * Function to check for menu entry selection on menu deactivation
545 void fgExecuteMenuCallback( SFG_Menu* menu )
547 SFG_MenuEntry *menuEntry;
550 * First of all check any of the active sub menus...
552 for( menuEntry = (SFG_MenuEntry *)menu->Entries.First;
554 menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next)
556 if( menuEntry->IsActive )
558 if( menuEntry->SubMenu )
559 fgExecuteMenuCallback( menuEntry->SubMenu );
562 menu->Callback( menuEntry->ID );
569 * Deactivates a menu pointed by the function argument.
571 void fgDeactivateMenu( SFG_Window *window )
573 SFG_Window *current_window = fgStructure.Window;
576 * Check if there is an active menu attached to this window...
578 SFG_Menu* menu = window->ActiveMenu;
579 SFG_MenuEntry *menuEntry;
582 * Did we find an active window?
584 freeglut_return_if_fail( menu );
587 * Hide the present menu's window
589 fgSetWindow( menu->Window );
593 * Forget about having that menu active anymore, now:
595 menu->Window->ActiveMenu = NULL;
596 menu->ParentWindow->ActiveMenu = NULL;
597 menu->IsActive = GL_FALSE;
599 fgState.ActiveMenus--;
602 * Hide all submenu windows, and the root menu's window.
604 for ( menuEntry = ( SFG_MenuEntry * )menu->Entries.First;
606 menuEntry = ( SFG_MenuEntry * )menuEntry->Node.Next )
609 * Is that an active submenu by any case?
611 if( menuEntry->SubMenu )
612 fgDeactivateSubMenu( menuEntry );
615 fgSetWindow( current_window );
619 * Deactivates a menu pointed by the function argument.
621 void fgDeactivateSubMenu( SFG_MenuEntry *menuEntry )
623 SFG_Window *current_window = fgStructure.Window;
624 SFG_MenuEntry *subMenuIter;
626 * Hide the present menu's window
628 fgSetWindow( menuEntry->SubMenu->Window );
632 * Forget about having that menu active anymore, now:
634 menuEntry->SubMenu->Window->ActiveMenu = NULL;
635 menuEntry->SubMenu->IsActive = GL_FALSE;
638 * Hide all submenu windows, and the root menu's window.
640 for ( subMenuIter = (SFG_MenuEntry *)menuEntry->SubMenu->Entries.First;
642 subMenuIter = (SFG_MenuEntry *)subMenuIter->Node.Next )
645 * Is that an active submenu by any case?
647 if( subMenuIter->SubMenu )
648 fgDeactivateSubMenu( subMenuIter );
651 fgSetWindow( current_window );
655 * Recalculates current menu's box size
657 void fghCalculateMenuBoxSize( void )
659 SFG_MenuEntry* menuEntry;
660 int width = 0, height = 0;
663 * Make sure there is a current menu set
665 freeglut_assert_ready;
666 freeglut_return_if_fail( fgStructure.Menu );
669 * The menu's box size depends on the menu entries:
671 for( menuEntry = ( SFG_MenuEntry * )fgStructure.Menu->Entries.First;
673 menuEntry = ( SFG_MenuEntry * )menuEntry->Node.Next )
676 * Update the menu entry's width value
678 menuEntry->Width = glutBitmapLength(
680 (unsigned char *)menuEntry->Text
684 * If the entry is a submenu, then it needs to be wider to
685 * accomodate the arrow. JCJ 31 July 2003
687 if (menuEntry->SubMenu )
688 menuEntry->Width += glutBitmapLength(
694 * Check if it's the biggest we've found
696 if( menuEntry->Width > width )
697 width = menuEntry->Width;
699 height += FREEGLUT_MENU_HEIGHT;
703 * Store the menu's box size now:
705 fgStructure.Menu->Height = height + 2 * FREEGLUT_MENU_BORDER;
706 fgStructure.Menu->Width = width + 4 * FREEGLUT_MENU_BORDER;
710 /* -- INTERFACE FUNCTIONS -------------------------------------------------- */
713 * Creates a new menu object, adding it to the freeglut structure
715 int FGAPIENTRY glutCreateMenu( void(* callback)( int ) )
718 * The menu object creation code resides in freeglut_structure.c
720 return fgCreateMenu( callback )->ID;
724 * Destroys a menu object, removing all references to it
726 void FGAPIENTRY glutDestroyMenu( int menuID )
728 SFG_Menu* menu = fgMenuByID( menuID );
730 freeglut_assert_ready;
731 freeglut_return_if_fail( menu );
734 * The menu object destruction code resides in freeglut_structure.c
736 fgDestroyMenu( menu );
740 * Returns the ID number of the currently active menu
742 int FGAPIENTRY glutGetMenu( void )
744 freeglut_assert_ready;
746 if( fgStructure.Menu )
747 return fgStructure.Menu->ID;
753 * Sets the current menu given its menu ID
755 void FGAPIENTRY glutSetMenu( int menuID )
757 SFG_Menu* menu = fgMenuByID( menuID );
759 freeglut_assert_ready;
760 freeglut_return_if_fail( menu );
762 fgStructure.Menu = menu;
766 * Adds a menu entry to the bottom of the current menu
768 void FGAPIENTRY glutAddMenuEntry( const char* label, int value )
770 SFG_MenuEntry* menuEntry =
771 (SFG_MenuEntry *)calloc( sizeof(SFG_MenuEntry), 1 );
773 freeglut_assert_ready;
774 freeglut_return_if_fail( fgStructure.Menu );
776 menuEntry->Text = strdup( label );
777 menuEntry->ID = value;
780 * Have the new menu entry attached to the current menu
782 fgListAppend( &fgStructure.Menu->Entries, &menuEntry->Node );
784 fghCalculateMenuBoxSize( );
788 * Add a sub menu to the bottom of the current menu
790 void FGAPIENTRY glutAddSubMenu( const char *label, int subMenuID )
792 SFG_MenuEntry *menuEntry =
793 ( SFG_MenuEntry * )calloc( sizeof( SFG_MenuEntry ), 1 );
794 SFG_Menu *subMenu = fgMenuByID( subMenuID );
796 freeglut_assert_ready;
797 freeglut_return_if_fail( fgStructure.Menu );
798 freeglut_return_if_fail( subMenu );
800 menuEntry->Text = strdup( label );
801 menuEntry->SubMenu = subMenu;
805 * Make the submenu's parent window be the menu's parent window
807 fghSetSubmenuParentWindow( fgStructure.Menu->ParentWindow, subMenu );
809 fgListAppend( &fgStructure.Menu->Entries, &menuEntry->Node );
810 fghCalculateMenuBoxSize( );
814 * Changes the specified menu item in the current menu into a menu entry
816 void FGAPIENTRY glutChangeToMenuEntry( int item, const char* label, int value )
818 SFG_MenuEntry* menuEntry = NULL;
820 freeglut_assert_ready;
821 freeglut_return_if_fail( fgStructure.Menu );
824 * Get n-th menu entry in the current menu, starting from one:
826 menuEntry = fghFindMenuEntry( fgStructure.Menu, item );
828 freeglut_return_if_fail( menuEntry );
831 * We want it to become a normal menu entry, so:
833 if( menuEntry->Text )
834 free( menuEntry->Text );
836 menuEntry->Text = strdup( label );
837 menuEntry->ID = value;
838 menuEntry->SubMenu = NULL;
839 fghCalculateMenuBoxSize( );
843 * Changes the specified menu item in the current menu into a sub-menu trigger.
845 void FGAPIENTRY glutChangeToSubMenu( int item, const char* label,
848 SFG_Menu* subMenu = fgMenuByID( subMenuID );
849 SFG_MenuEntry* menuEntry = NULL;
851 freeglut_assert_ready;
852 freeglut_return_if_fail( fgStructure.Menu );
853 freeglut_return_if_fail( subMenu );
856 * Get n-th menu entry in the current menu, starting from one:
858 menuEntry = fghFindMenuEntry( fgStructure.Menu, item );
860 freeglut_return_if_fail( menuEntry );
863 * We want it to become a sub menu entry, so:
865 if( menuEntry->Text )
866 free( menuEntry->Text );
868 menuEntry->Text = strdup( label );
869 menuEntry->SubMenu = subMenu;
871 fghCalculateMenuBoxSize( );
875 * Removes the specified menu item from the current menu
877 void FGAPIENTRY glutRemoveMenuItem( int item )
879 SFG_MenuEntry* menuEntry;
881 freeglut_assert_ready;
882 freeglut_return_if_fail( fgStructure.Menu );
885 * Get n-th menu entry in the current menu, starting from one:
887 menuEntry = fghFindMenuEntry( fgStructure.Menu, item );
889 freeglut_return_if_fail( menuEntry );
891 fgListRemove( &fgStructure.Menu->Entries, &menuEntry->Node );
892 if ( menuEntry->Text )
893 free( menuEntry->Text );
896 fghCalculateMenuBoxSize( );
900 * Attaches a menu to the current window
902 void FGAPIENTRY glutAttachMenu( int button )
904 freeglut_assert_ready;
906 freeglut_return_if_fail( fgStructure.Window );
907 freeglut_return_if_fail( fgStructure.Menu );
909 freeglut_return_if_fail( button >= 0 );
910 freeglut_return_if_fail( button < FREEGLUT_MAX_MENUS );
912 fgStructure.Window->Menu[ button ] = fgStructure.Menu;
915 * Make the parent window of the menu (and all submenus) the current window
917 fghSetSubmenuParentWindow( fgStructure.Window, fgStructure.Menu );
921 * Detaches a menu from the current window
923 void FGAPIENTRY glutDetachMenu( int button )
925 freeglut_assert_ready;
927 freeglut_return_if_fail( fgStructure.Window );
928 freeglut_return_if_fail( fgStructure.Menu );
930 freeglut_return_if_fail( button >= 0 );
931 freeglut_return_if_fail( button < FREEGLUT_MAX_MENUS );
933 fgStructure.Window->Menu[ button ] = NULL;
937 * A.Donev: Set and retrieve the menu's user data
939 void* FGAPIENTRY glutGetMenuData( void )
941 return fgStructure.Menu->UserData;
944 void FGAPIENTRY glutSetMenuData(void* data)
946 fgStructure.Menu->UserData=data;
949 /*** END OF FILE ***/