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reactphysics3d/examples/common/opengl-framework/freeglut/freeglut_menu.c

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Use the opengl-framework library for the examples
2013-04-14 19:32:40 +00:00
/*
* freeglut_menu.c
*
* Pull-down menu creation and handling.
*
* Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
* Written by Pawel W. Olszta, <olszta@sourceforge.net>
* Creation date: Thu Dec 16 1999
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#define FREEGLUT_BUILDING_LIB
#include <GL/freeglut.h>
#include "freeglut_internal.h"
/* -- DEFINITIONS ---------------------------------------------------------- */
/*
* FREEGLUT_MENU_FONT can be any freeglut bitmapped font.
* (Stroked fonts would not be out of the question, but we'd need to alter
* code, since GLUT (hence freeglut) does not quite unify stroked and
* bitmapped font handling.)
* Old UNIX/X11 GLUT (BSD, UNIX, IRIX, LINUX, HPUX, ...) used a system
* font best approximated by an 18-pixel HELVETICA, I think. MS-WINDOWS
* GLUT used something closest to the 8x13 fixed-width font. (Old
* GLUT apparently uses host-system menus rather than building its own.
* freeglut is building its own menus from scratch.)
*
* FREEGLUT_MENU_HEIGHT gives the height of ONE menu box. This should be
* the distances between two adjacent menu entries. It should scale
* automatically with the font choice, so you needn't alter it---unless you
* use a stroked font.
*
* FREEGLUT_MENU_BORDER says how many pixels to allow around the edge of a
* menu. (It also seems to be the same as the number of pixels used as
* a border around *items* to separate them from neighbors. John says
* that that wasn't the original intent...if not, perhaps we need another
* symbolic constant, FREEGLUT_MENU_ITEM_BORDER, or such.)
*/
#if TARGET_HOST_MS_WINDOWS
#define FREEGLUT_MENU_FONT GLUT_BITMAP_8_BY_13
#else
#define FREEGLUT_MENU_FONT GLUT_BITMAP_HELVETICA_18
#endif
#define FREEGLUT_MENU_HEIGHT (glutBitmapHeight(FREEGLUT_MENU_FONT) + \
FREEGLUT_MENU_BORDER)
#define FREEGLUT_MENU_BORDER 2
/*
* These variables are for rendering the freeglut menu items.
*
* The choices are fore- and background, with and without h for Highlighting.
* Old GLUT appeared to be system-dependant for its colors (sigh) so we are
* too. These variables should be stuffed into global state and initialized
* via the glutInit*() system.
*/
#if TARGET_HOST_MS_WINDOWS
static float menu_pen_fore [4] = {0.0f, 0.0f, 0.0f, 1.0f};
static float menu_pen_back [4] = {0.85f, 0.85f, 0.85f, 1.0f};
static float menu_pen_hfore [4] = {1.0f, 1.0f, 1.0f, 1.0f};
static float menu_pen_hback [4] = {0.15f, 0.15f, 0.45f, 1.0f};
#else
static float menu_pen_fore [4] = {0.0f, 0.0f, 0.0f, 1.0f};
static float menu_pen_back [4] = {0.70f, 0.70f, 0.70f, 1.0f};
static float menu_pen_hfore [4] = {0.0f, 0.0f, 0.0f, 1.0f};
static float menu_pen_hback [4] = {1.0f, 1.0f, 1.0f, 1.0f};
#endif
/* -- PRIVATE FUNCTIONS ---------------------------------------------------- */
/*
* Private function to find a menu entry by index
*/
static SFG_MenuEntry *fghFindMenuEntry( SFG_Menu* menu, int index )
{
SFG_MenuEntry *entry;
int i = 1;
for( entry = (SFG_MenuEntry *)menu->Entries.First;
entry;
entry = (SFG_MenuEntry *)entry->Node.Next )
{
if( i == index )
break;
++i;
}
return entry;
}
/*
* Deactivates a menu pointed by the function argument.
*/
static void fghDeactivateSubMenu( SFG_MenuEntry *menuEntry )
{
SFG_MenuEntry *subMenuIter;
/* Hide the present menu's window */
fgSetWindow( menuEntry->SubMenu->Window );
glutHideWindow( );
/* Forget about having that menu active anymore, now: */
menuEntry->SubMenu->Window->ActiveMenu = NULL;
menuEntry->SubMenu->IsActive = GL_FALSE;
menuEntry->SubMenu->ActiveEntry = NULL;
/* Hide all submenu windows, and the root menu's window. */
for ( subMenuIter = (SFG_MenuEntry *)menuEntry->SubMenu->Entries.First;
subMenuIter;
subMenuIter = (SFG_MenuEntry *)subMenuIter->Node.Next )
{
subMenuIter->IsActive = GL_FALSE;
/* Is that an active submenu by any case? */
if( subMenuIter->SubMenu )
fghDeactivateSubMenu( subMenuIter );
}
fgSetWindow ( menuEntry->SubMenu->ParentWindow ) ;
}
/*
* Private function to get the virtual maximum screen extent
*/
static GLvoid fghGetVMaxExtent( SFG_Window* window, int* x, int* y )
{
if( fgStructure.GameModeWindow )
{
#if TARGET_HOST_POSIX_X11
int wx, wy;
Window w;
XTranslateCoordinates(
fgDisplay.Display,
window->Window.Handle,
fgDisplay.RootWindow,
0, 0, &wx, &wy, &w);
*x = fgState.GameModeSize.X + wx;
*y = fgState.GameModeSize.Y + wy;
#else
*x = glutGet ( GLUT_SCREEN_WIDTH );
*y = glutGet ( GLUT_SCREEN_HEIGHT );
#endif
}
else
{
*x = fgDisplay.ScreenWidth;
*y = fgDisplay.ScreenHeight;
}
}
/*
* Private function to check for the current menu/sub menu activity state
*/
static GLboolean fghCheckMenuStatus( SFG_Menu* menu )
{
SFG_MenuEntry* menuEntry;
int x, y;
/* First of all check any of the active sub menus... */
for( menuEntry = (SFG_MenuEntry *)menu->Entries.First;
menuEntry;
menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
{
if( menuEntry->SubMenu && menuEntry->IsActive )
{
/*
* OK, have the sub-menu checked, too. If it returns GL_TRUE, it
* will mean that it caught the mouse cursor and we do not need
* to regenerate the activity list, and so our parents do...
*/
GLboolean return_status;
menuEntry->SubMenu->Window->State.MouseX =
menu->Window->State.MouseX + menu->X - menuEntry->SubMenu->X;
menuEntry->SubMenu->Window->State.MouseY =
menu->Window->State.MouseY + menu->Y - menuEntry->SubMenu->Y;
return_status = fghCheckMenuStatus( menuEntry->SubMenu );
if ( return_status )
return GL_TRUE;
}
}
/* That much about our sub menus, let's get to checking the current menu: */
x = menu->Window->State.MouseX;
y = menu->Window->State.MouseY;
/* Check if the mouse cursor is contained within the current menu box */
if( ( x >= FREEGLUT_MENU_BORDER ) &&
( x < menu->Width - FREEGLUT_MENU_BORDER ) &&
( y >= FREEGLUT_MENU_BORDER ) &&
( y < menu->Height - FREEGLUT_MENU_BORDER ) )
{
int menuID = ( y - FREEGLUT_MENU_BORDER ) / FREEGLUT_MENU_HEIGHT;
/* The mouse cursor is somewhere over our box, check it out. */
menuEntry = fghFindMenuEntry( menu, menuID + 1 );
FREEGLUT_INTERNAL_ERROR_EXIT( menuEntry, "Cannot find menu entry",
"fghCheckMenuStatus" );
menuEntry->IsActive = GL_TRUE;
menuEntry->Ordinal = menuID;
/*
* If this is not the same as the last active menu entry, deactivate
* the previous entry. Specifically, if the previous active entry
* was a submenu then deactivate it.
*/
if( menu->ActiveEntry && ( menuEntry != menu->ActiveEntry ) )
if( menu->ActiveEntry->SubMenu )
fghDeactivateSubMenu( menu->ActiveEntry );
if( menuEntry != menu->ActiveEntry )
{
menu->Window->State.Redisplay = GL_TRUE;
if( menu->ActiveEntry )
menu->ActiveEntry->IsActive = GL_FALSE;
}
menu->ActiveEntry = menuEntry;
menu->IsActive = GL_TRUE; /* XXX Do we need this? */
/*
* OKi, we have marked that entry as active, but it would be also
* nice to have its contents updated, in case it's a sub menu.
* Also, ignore the return value of the check function:
*/
if( menuEntry->SubMenu )
{
if ( ! menuEntry->SubMenu->IsActive )
{
int max_x, max_y;
SFG_Window *current_window = fgStructure.CurrentWindow;
/* Set up the initial menu position now... */
menuEntry->SubMenu->IsActive = GL_TRUE;
/* Set up the initial submenu position now: */
fghGetVMaxExtent(menu->ParentWindow, &max_x, &max_y);
menuEntry->SubMenu->X = menu->X + menu->Width;
menuEntry->SubMenu->Y = menu->Y +
menuEntry->Ordinal * FREEGLUT_MENU_HEIGHT;
if( menuEntry->SubMenu->X + menuEntry->SubMenu->Width > max_x )
menuEntry->SubMenu->X = menu->X - menuEntry->SubMenu->Width;
if( menuEntry->SubMenu->Y + menuEntry->SubMenu->Height > max_y )
{
menuEntry->SubMenu->Y -= ( menuEntry->SubMenu->Height -
FREEGLUT_MENU_HEIGHT -
2 * FREEGLUT_MENU_BORDER );
if( menuEntry->SubMenu->Y < 0 )
menuEntry->SubMenu->Y = 0;
}
fgSetWindow( menuEntry->SubMenu->Window );
glutPositionWindow( menuEntry->SubMenu->X,
menuEntry->SubMenu->Y );
glutReshapeWindow( menuEntry->SubMenu->Width,
menuEntry->SubMenu->Height );
glutPopWindow( );
glutShowWindow( );
menuEntry->SubMenu->Window->ActiveMenu = menuEntry->SubMenu;
fgSetWindow( current_window );
menuEntry->SubMenu->Window->State.MouseX =
x + menu->X - menuEntry->SubMenu->X;
menuEntry->SubMenu->Window->State.MouseY =
y + menu->Y - menuEntry->SubMenu->Y;
fghCheckMenuStatus( menuEntry->SubMenu );
}
/* Activate it because its parent entry is active */
menuEntry->SubMenu->IsActive = GL_TRUE; /* XXX Do we need this? */
}
/* Report back that we have caught the menu cursor */
return GL_TRUE;
}
/* Looks like the menu cursor is somewhere else... */
if( menu->ActiveEntry && menu->ActiveEntry->IsActive &&
( !menu->ActiveEntry->SubMenu ||
!menu->ActiveEntry->SubMenu->IsActive ) )
{
menu->Window->State.Redisplay = GL_TRUE;
menu->ActiveEntry->IsActive = GL_FALSE;
menu->ActiveEntry = NULL;
}
return GL_FALSE;
}
/*
* Displays a menu box and all of its submenus (if they are active)
*/
static void fghDisplayMenuBox( SFG_Menu* menu )
{
SFG_MenuEntry *menuEntry;
int i;
int border = FREEGLUT_MENU_BORDER;
/*
* Have the menu box drawn first. The +- values are
* here just to make it more nice-looking...
*/
/* a non-black dark version of the below. */
glColor4f( 1.0f, 1.0f, 1.0f, 1.0f );
glBegin( GL_QUAD_STRIP );
glVertex2i( menu->Width , 0 );
glVertex2i( menu->Width - border, border);
glVertex2i( 0 , 0 );
glVertex2i( border, border);
glVertex2i( 0 , menu->Height );
glVertex2i( border, menu->Height - border);
glEnd( );
/* a non-black dark version of the below. */
glColor4f( 0.5f, 0.5f, 0.5f, 1.0f );
glBegin( GL_QUAD_STRIP );
glVertex2i( 0 , menu->Height );
glVertex2i( border, menu->Height - border);
glVertex2i( menu->Width , menu->Height );
glVertex2i( menu->Width - border, menu->Height - border);
glVertex2i( menu->Width , 0 );
glVertex2i( menu->Width - border, border);
glEnd( );
glColor4fv( menu_pen_back );
glBegin( GL_QUADS );
glVertex2i( border, border);
glVertex2i( menu->Width - border, border);
glVertex2i( menu->Width - border, menu->Height - border);
glVertex2i( border, menu->Height - border);
glEnd( );
/* Check if any of the submenus is currently active... */
for( menuEntry = (SFG_MenuEntry *)menu->Entries.First;
menuEntry;
menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next )
{
/* Has the menu been marked as active, maybe? */
if( menuEntry->IsActive )
{
/*
* That's truly right, and we need to have it highlighted.
* There is an assumption that mouse cursor didn't move
* since the last check of menu activity state:
*/
int menuID = menuEntry->Ordinal;
/* So have the highlight drawn... */
glColor4fv( menu_pen_hback );
glBegin( GL_QUADS );
glVertex2i( border,
(menuID + 0)*FREEGLUT_MENU_HEIGHT + border );
glVertex2i( menu->Width - border,
(menuID + 0)*FREEGLUT_MENU_HEIGHT + border );
glVertex2i( menu->Width - border,
(menuID + 1)*FREEGLUT_MENU_HEIGHT + border );
glVertex2i( border,
(menuID + 1)*FREEGLUT_MENU_HEIGHT + border );
glEnd( );
}
}
/* Print the menu entries now... */
glColor4fv( menu_pen_fore );
for( menuEntry = (SFG_MenuEntry *)menu->Entries.First, i = 0;
menuEntry;
menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next, ++i )
{
/* If the menu entry is active, set the color to white */
if( menuEntry->IsActive )
glColor4fv( menu_pen_hfore );
/* Move the raster into position... */
/* Try to center the text - JCJ 31 July 2003*/
glRasterPos2i(
2 * border,
( i + 1 )*FREEGLUT_MENU_HEIGHT -
( int )( FREEGLUT_MENU_HEIGHT*0.3 - border )
);
/* Have the label drawn, character after character: */
glutBitmapString( FREEGLUT_MENU_FONT,
(unsigned char *)menuEntry->Text);
/* If it's a submenu, draw a right arrow */
if( menuEntry->SubMenu )
{
int width = glutBitmapWidth( FREEGLUT_MENU_FONT, '_' );
int x_base = menu->Width - 2 - width;
int y_base = i*FREEGLUT_MENU_HEIGHT + border;
glBegin( GL_TRIANGLES );
glVertex2i( x_base, y_base + 2*border);
glVertex2i( menu->Width - 2, y_base +
( FREEGLUT_MENU_HEIGHT + border) / 2 );
glVertex2i( x_base, y_base + FREEGLUT_MENU_HEIGHT - border );
glEnd( );
}
/* If the menu entry is active, reset the color */
if( menuEntry->IsActive )
glColor4fv( menu_pen_fore );
}
}
/*
* Private static function to set the parent window of a submenu and all
* of its submenus
*/
static void fghSetMenuParentWindow( SFG_Window *window, SFG_Menu *menu )
{
SFG_MenuEntry *menuEntry;
menu->ParentWindow = window;
for( menuEntry = ( SFG_MenuEntry * )menu->Entries.First;
menuEntry;
menuEntry = ( SFG_MenuEntry * )menuEntry->Node.Next )
if( menuEntry->SubMenu )
fghSetMenuParentWindow( window, menuEntry->SubMenu );
}
/*
* Function to check for menu entry selection on menu deactivation
*/
static void fghExecuteMenuCallback( SFG_Menu* menu )
{
SFG_MenuEntry *menuEntry;
/* First of all check any of the active sub menus... */
for( menuEntry = (SFG_MenuEntry *)menu->Entries.First;
menuEntry;
menuEntry = (SFG_MenuEntry *)menuEntry->Node.Next)
{
if( menuEntry->IsActive )
{
if( menuEntry->SubMenu )
fghExecuteMenuCallback( menuEntry->SubMenu );
else
if( menu->Callback )
{
SFG_Menu *save_menu = fgStructure.CurrentMenu;
fgStructure.CurrentMenu = menu;
menu->Callback( menuEntry->ID );
fgStructure.CurrentMenu = save_menu;
}
return;
}
}
}
/*
* Displays the currently active menu for the current window
*/
void fgDisplayMenu( void )
{
SFG_Window* window = fgStructure.CurrentWindow;
SFG_Menu* menu = NULL;
FREEGLUT_INTERNAL_ERROR_EXIT ( fgStructure.CurrentWindow, "Displaying menu in nonexistent window",
"fgDisplayMenu" );
/* Check if there is an active menu attached to this window... */
menu = window->ActiveMenu;
freeglut_return_if_fail( menu );
fgSetWindow( menu->Window );
glPushAttrib( GL_DEPTH_BUFFER_BIT | GL_TEXTURE_BIT | GL_LIGHTING_BIT |
GL_POLYGON_BIT );
glDisable( GL_DEPTH_TEST );
glDisable( GL_TEXTURE_2D );
glDisable( GL_LIGHTING );
glDisable( GL_CULL_FACE );
glMatrixMode( GL_PROJECTION );
glPushMatrix( );
glLoadIdentity( );
glOrtho(
0, glutGet( GLUT_WINDOW_WIDTH ),
glutGet( GLUT_WINDOW_HEIGHT ), 0,
-1, 1
);
glMatrixMode( GL_MODELVIEW );
glPushMatrix( );
glLoadIdentity( );
fghDisplayMenuBox( menu );
glPopAttrib( );
glMatrixMode( GL_PROJECTION );
glPopMatrix( );
glMatrixMode( GL_MODELVIEW );
glPopMatrix( );
glutSwapBuffers( );
fgSetWindow ( window );
}
/*
* Activates a menu pointed by the function argument
*/
static void fghActivateMenu( SFG_Window* window, int button )
{
int max_x, max_y;
/* We'll be referencing this menu a lot, so remember its address: */
SFG_Menu* menu = window->Menu[ button ];
SFG_Window* current_window = fgStructure.CurrentWindow;
/* If the menu is already active in another window, deactivate it there */
if ( menu->ParentWindow )
menu->ParentWindow->ActiveMenu = NULL ;
/* Mark the menu as active, so that it gets displayed: */
window->ActiveMenu = menu;
menu->IsActive = GL_TRUE;
fghSetMenuParentWindow ( window, menu );
fgState.ActiveMenus++;
/* Set up the initial menu position now: */
fghGetVMaxExtent(menu->ParentWindow, &max_x, &max_y);
fgSetWindow( window );
menu->X = window->State.MouseX + glutGet( GLUT_WINDOW_X );
menu->Y = window->State.MouseY + glutGet( GLUT_WINDOW_Y );
if( menu->X + menu->Width > max_x )
menu->X -=menu->Width;
if( menu->Y + menu->Height > max_y )
{
menu->Y -=menu->Height;
if( menu->Y < 0 )
menu->Y = 0;
}
menu->Window->State.MouseX =
window->State.MouseX + glutGet( GLUT_WINDOW_X ) - menu->X;
menu->Window->State.MouseY =
window->State.MouseY + glutGet( GLUT_WINDOW_Y ) - menu->Y;
fgSetWindow( menu->Window );
glutPositionWindow( menu->X, menu->Y );
glutReshapeWindow( menu->Width, menu->Height );
glutPopWindow( );
glutShowWindow( );
menu->Window->ActiveMenu = menu;
fghCheckMenuStatus( menu );
fgSetWindow( current_window );
}
/*
* Update Highlight states of the menu
*
* Current mouse position is in menu->Window->State.MouseX/Y.
*/
void fgUpdateMenuHighlight ( SFG_Menu *menu )
{
fghCheckMenuStatus( menu );
}
/*
* Check whether an active menu absorbs a mouse click
*/
GLboolean fgCheckActiveMenu ( SFG_Window *window, int button, GLboolean pressed,
int mouse_x, int mouse_y )
{
/*
* Near as I can tell, this is the menu behaviour:
* - Down-click the menu button, menu not active: activate
* the menu with its upper left-hand corner at the mouse
* location.
* - Down-click any button outside the menu, menu active:
* deactivate the menu
* - Down-click any button inside the menu, menu active:
* select the menu entry and deactivate the menu
* - Up-click the menu button, menu not active: nothing happens
* - Up-click the menu button outside the menu, menu active:
* nothing happens
* - Up-click the menu button inside the menu, menu active:
* select the menu entry and deactivate the menu
* Since menus can have submenus, we need to check this recursively.
*/
if( window->ActiveMenu )
{
if( window == window->ActiveMenu->ParentWindow )
{
window->ActiveMenu->Window->State.MouseX =
mouse_x - window->ActiveMenu->X;
window->ActiveMenu->Window->State.MouseY =
mouse_y - window->ActiveMenu->Y;
}
/* In the menu, invoke the callback and deactivate the menu */
if( fghCheckMenuStatus( window->ActiveMenu ) )
{
/*
* Save the current window and menu and set the current
* window to the window whose menu this is
*/
SFG_Window *save_window = fgStructure.CurrentWindow;
SFG_Menu *save_menu = fgStructure.CurrentMenu;
SFG_Window *parent_window = window->ActiveMenu->ParentWindow;
fgSetWindow( parent_window );
fgStructure.CurrentMenu = window->ActiveMenu;
/* Execute the menu callback */
fghExecuteMenuCallback( window->ActiveMenu );
fgDeactivateMenu( parent_window );
/* Restore the current window and menu */
fgSetWindow( save_window );
fgStructure.CurrentMenu = save_menu;
}
else if( pressed )
/*
* Outside the menu, deactivate if it's a downclick
*
* XXX This isn't enough. A downclick outside of
* XXX the interior of our freeglut windows should also
* XXX deactivate the menu. This is more complicated.
*/
fgDeactivateMenu( window->ActiveMenu->ParentWindow );
/*
* XXX Why does an active menu require a redisplay at
* XXX this point? If this can come out cleanly, then
* XXX it probably should do so; if not, a comment should
* XXX explain it.
*/
if( ! window->IsMenu )
window->State.Redisplay = GL_TRUE;
return GL_TRUE;
}
/* No active menu, let's check whether we need to activate one. */
if( ( 0 <= button ) &&
( FREEGLUT_MAX_MENUS > button ) &&
( window->Menu[ button ] ) &&
pressed )
{
/* XXX Posting a requisite Redisplay seems bogus. */
window->State.Redisplay = GL_TRUE;
fghActivateMenu( window, button );
return GL_TRUE;
}
return GL_FALSE;
}
/*
* Deactivates a menu pointed by the function argument.
*/
void fgDeactivateMenu( SFG_Window *window )
{
SFG_Window *parent_window = NULL;
/* Check if there is an active menu attached to this window... */
SFG_Menu* menu = window->ActiveMenu;
SFG_MenuEntry *menuEntry;
/* Did we find an active window? */
freeglut_return_if_fail( menu );
parent_window = menu->ParentWindow;
/* Hide the present menu's window */
fgSetWindow( menu->Window );
glutHideWindow( );
/* Forget about having that menu active anymore, now: */
menu->Window->ActiveMenu = NULL;
menu->ParentWindow->ActiveMenu = NULL;
fghSetMenuParentWindow ( NULL, menu );
menu->IsActive = GL_FALSE;
menu->ActiveEntry = NULL;
fgState.ActiveMenus--;
/* Hide all submenu windows, and the root menu's window. */
for ( menuEntry = ( SFG_MenuEntry * )menu->Entries.First;
menuEntry;
menuEntry = ( SFG_MenuEntry * )menuEntry->Node.Next )
{
menuEntry->IsActive = GL_FALSE;
/* Is that an active submenu by any case? */
if( menuEntry->SubMenu )
fghDeactivateSubMenu( menuEntry );
}
fgSetWindow ( parent_window ) ;
}
/*
* Recalculates current menu's box size
*/
void fghCalculateMenuBoxSize( void )
{
SFG_MenuEntry* menuEntry;
int width = 0, height = 0;
/* Make sure there is a current menu set */
freeglut_return_if_fail( fgStructure.CurrentMenu );
/* The menu's box size depends on the menu entries: */
for( menuEntry = ( SFG_MenuEntry * )fgStructure.CurrentMenu->Entries.First;
menuEntry;
menuEntry = ( SFG_MenuEntry * )menuEntry->Node.Next )
{
/* Update the menu entry's width value */
menuEntry->Width = glutBitmapLength(
FREEGLUT_MENU_FONT,
(unsigned char *)menuEntry->Text
);
/*
* If the entry is a submenu, then it needs to be wider to
* accomodate the arrow. JCJ 31 July 2003
*/
if (menuEntry->SubMenu )
menuEntry->Width += glutBitmapLength(
FREEGLUT_MENU_FONT,
(unsigned char *)"_"
);
/* Check if it's the biggest we've found */
if( menuEntry->Width > width )
width = menuEntry->Width;
height += FREEGLUT_MENU_HEIGHT;
}
/* Store the menu's box size now: */
fgStructure.CurrentMenu->Height = height + 2 * FREEGLUT_MENU_BORDER;
fgStructure.CurrentMenu->Width = width + 4 * FREEGLUT_MENU_BORDER;
}
/* -- INTERFACE FUNCTIONS -------------------------------------------------- */
/*
* Creates a new menu object, adding it to the freeglut structure
*/
int FGAPIENTRY glutCreateMenu( void(* callback)( int ) )
{
/* The menu object creation code resides in freeglut_structure.c */
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutCreateMenu" );
return fgCreateMenu( callback )->ID;
}
#if TARGET_HOST_MS_WINDOWS
int FGAPIENTRY __glutCreateMenuWithExit( void(* callback)( int ), void (__cdecl *exit_function)(int) )
{
__glutExitFunc = exit_function;
return glutCreateMenu( callback );
}
#endif
/*
* Destroys a menu object, removing all references to it
*/
void FGAPIENTRY glutDestroyMenu( int menuID )
{
SFG_Menu* menu;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutDestroyMenu" );
menu = fgMenuByID( menuID );
freeglut_return_if_fail( menu );
/* The menu object destruction code resides in freeglut_structure.c */
fgDestroyMenu( menu );
}
/*
* Returns the ID number of the currently active menu
*/
int FGAPIENTRY glutGetMenu( void )
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutGetMenu" );
if( fgStructure.CurrentMenu )
return fgStructure.CurrentMenu->ID;
return 0;
}
/*
* Sets the current menu given its menu ID
*/
void FGAPIENTRY glutSetMenu( int menuID )
{
SFG_Menu* menu;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSetMenu" );
menu = fgMenuByID( menuID );
freeglut_return_if_fail( menu );
fgStructure.CurrentMenu = menu;
}
/*
* Adds a menu entry to the bottom of the current menu
*/
void FGAPIENTRY glutAddMenuEntry( const char* label, int value )
{
SFG_MenuEntry* menuEntry;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutAddMenuEntry" );
menuEntry = (SFG_MenuEntry *)calloc( sizeof(SFG_MenuEntry), 1 );
freeglut_return_if_fail( fgStructure.CurrentMenu );
menuEntry->Text = strdup( label );
menuEntry->ID = value;
/* Have the new menu entry attached to the current menu */
fgListAppend( &fgStructure.CurrentMenu->Entries, &menuEntry->Node );
fghCalculateMenuBoxSize( );
}
/*
* Add a sub menu to the bottom of the current menu
*/
void FGAPIENTRY glutAddSubMenu( const char *label, int subMenuID )
{
SFG_MenuEntry *menuEntry;
SFG_Menu *subMenu;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutAddSubMenu" );
menuEntry = ( SFG_MenuEntry * )calloc( sizeof( SFG_MenuEntry ), 1 );
subMenu = fgMenuByID( subMenuID );
freeglut_return_if_fail( fgStructure.CurrentMenu );
freeglut_return_if_fail( subMenu );
menuEntry->Text = strdup( label );
menuEntry->SubMenu = subMenu;
menuEntry->ID = -1;
fgListAppend( &fgStructure.CurrentMenu->Entries, &menuEntry->Node );
fghCalculateMenuBoxSize( );
}
/*
* Changes the specified menu item in the current menu into a menu entry
*/
void FGAPIENTRY glutChangeToMenuEntry( int item, const char* label, int value )
{
SFG_MenuEntry* menuEntry = NULL;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutChangeToMenuEntry" );
freeglut_return_if_fail( fgStructure.CurrentMenu );
/* Get n-th menu entry in the current menu, starting from one: */
menuEntry = fghFindMenuEntry( fgStructure.CurrentMenu, item );
freeglut_return_if_fail( menuEntry );
/* We want it to become a normal menu entry, so: */
if( menuEntry->Text )
free( menuEntry->Text );
menuEntry->Text = strdup( label );
menuEntry->ID = value;
menuEntry->SubMenu = NULL;
fghCalculateMenuBoxSize( );
}
/*
* Changes the specified menu item in the current menu into a sub-menu trigger.
*/
void FGAPIENTRY glutChangeToSubMenu( int item, const char* label,
int subMenuID )
{
SFG_Menu* subMenu;
SFG_MenuEntry* menuEntry;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutChangeToSubMenu" );
subMenu = fgMenuByID( subMenuID );
menuEntry = NULL;
freeglut_return_if_fail( fgStructure.CurrentMenu );
freeglut_return_if_fail( subMenu );
/* Get n-th menu entry in the current menu, starting from one: */
menuEntry = fghFindMenuEntry( fgStructure.CurrentMenu, item );
freeglut_return_if_fail( menuEntry );
/* We want it to become a sub menu entry, so: */
if( menuEntry->Text )
free( menuEntry->Text );
menuEntry->Text = strdup( label );
menuEntry->SubMenu = subMenu;
menuEntry->ID = -1;
fghCalculateMenuBoxSize( );
}
/*
* Removes the specified menu item from the current menu
*/
void FGAPIENTRY glutRemoveMenuItem( int item )
{
SFG_MenuEntry* menuEntry;
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutRemoveMenuItem" );
freeglut_return_if_fail( fgStructure.CurrentMenu );
/* Get n-th menu entry in the current menu, starting from one: */
menuEntry = fghFindMenuEntry( fgStructure.CurrentMenu, item );
freeglut_return_if_fail( menuEntry );
fgListRemove( &fgStructure.CurrentMenu->Entries, &menuEntry->Node );
if ( menuEntry->Text )
free( menuEntry->Text );
free( menuEntry );
fghCalculateMenuBoxSize( );
}
/*
* Attaches a menu to the current window
*/
void FGAPIENTRY glutAttachMenu( int button )
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutAttachMenu" );
freeglut_return_if_fail( fgStructure.CurrentWindow );
freeglut_return_if_fail( fgStructure.CurrentMenu );
freeglut_return_if_fail( button >= 0 );
freeglut_return_if_fail( button < FREEGLUT_MAX_MENUS );
fgStructure.CurrentWindow->Menu[ button ] = fgStructure.CurrentMenu;
}
/*
* Detaches a menu from the current window
*/
void FGAPIENTRY glutDetachMenu( int button )
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutDetachMenu" );
freeglut_return_if_fail( fgStructure.CurrentWindow );
freeglut_return_if_fail( fgStructure.CurrentMenu );
freeglut_return_if_fail( button >= 0 );
freeglut_return_if_fail( button < FREEGLUT_MAX_MENUS );
fgStructure.CurrentWindow->Menu[ button ] = NULL;
}
/*
* A.Donev: Set and retrieve the menu's user data
*/
void* FGAPIENTRY glutGetMenuData( void )
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutGetMenuData" );
return fgStructure.CurrentMenu->UserData;
}
void FGAPIENTRY glutSetMenuData(void* data)
{
FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSetMenuData" );
fgStructure.CurrentMenu->UserData=data;
}
/*** END OF FILE ***/
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