/*
* 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" );
freeglut_return_if_fail( fgStructure.CurrentMenu );
if (fgGetActiveMenu())
fgError("Menu manipulation not allowed while menus in use.");
/* Get handle to sub menu */
subMenu = fgMenuByID( subMenuID );
menuEntry = NULL;
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( );
}
/*
* 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" );
if (fgGetActiveMenu())
fgError("Menu manipulation not allowed while menus in use.");
return fgCreateMenu( callback )->ID;
}
/*
* 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 );
if (fgGetActiveMenu())
fgError("Menu manipulation not allowed while menus in use.");
/* The menu object destruction code resides in freeglut_structure.c */
fgDestroyMenu( menu );
}
/*
* 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 );
if (fgGetActiveMenu())
fgError("Menu manipulation not allowed while menus in use.");
freeglut_return_if_fail( button >= 0 );
freeglut_return_if_fail( button < FREEGLUT_MAX_MENUS );
fgStructure.CurrentWindow->Menu[ button ] = NULL;
}
/*
* 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 );
if (fgGetActiveMenu())
fgError("Menu manipulation not allowed while menus in use.");
menuEntry->Text = strdup( label );
menuEntry->ID = value;
/* Have the new menu entry attached to the current menu */
fgListAppend( &fgStructure.CurrentMenu->Entries, &menuEntry->Node );
fghCalculateMenuBoxSize( );
}
void fgPlatformCheckMenuDeactivate()
{
/* If we have an open menu, see if the open menu should be closed
* when focus was lost because user either switched
* application or FreeGLUT window (if one is running multiple
* windows). If so, close menu the active menu.
*/
SFG_Menu* menu = NULL;
if ( fgStructure.Menus.First )
menu = fgGetActiveMenu();
if ( menu )
{
SFG_Window* wnd = NULL;
HWND hwnd = GetFocus(); /* Get window with current focus - NULL for non freeglut windows */
if (hwnd)
/* See which of our windows it is */
wnd = fgWindowByHandle(hwnd);
if (!hwnd || !wnd)
/* User switched to another application*/
fgDeactivateMenu(menu->ParentWindow);
else if (!wnd->IsMenu) /* Make sure we don't kill the menu when trying to enter a submenu */
{
if (wnd!=menu->ParentWindow)
/* User switched to another FreeGLUT window */
fgDeactivateMenu(menu->ParentWindow);
else
{
/* Check if focus lost because non-client area of
* window was pressed (pressing on client area is
* handled in fgCheckActiveMenu)
*/
POINT mouse_pos;
RECT clientArea;
fghGetClientArea(&clientArea,menu->ParentWindow, GL_FALSE);
GetCursorPos(&mouse_pos);
if ( !PtInRect( &clientArea, mouse_pos ) )
fgDeactivateMenu(menu->ParentWindow);
}
}
}
};
/*
* 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 );
if (fgGetActiveMenu())
fgError("Menu manipulation not allowed while menus in use.");
freeglut_return_if_fail( subMenu );
menuEntry->Text = strdup( label );
menuEntry->SubMenu = subMenu;
menuEntry->ID = -1;
fgListAppend( &fgStructure.CurrentMenu->Entries, &menuEntry->Node );
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 );
if (fgGetActiveMenu())
fgError("Menu manipulation not allowed while menus in use.");
/* 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( );
}
/*
* Check whether an active menu absorbs a mouse click
*/
GLboolean fgCheckActiveMenu ( SFG_Window *window, int button, GLboolean pressed,
int mouse_x, int mouse_y )
{
GLboolean is_handled = GL_FALSE;
GLboolean is_clicked = GL_FALSE;
/*
* 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, and potentially activate a new menu
* at the new mouse location. This includes clicks in
* different windows of course
* - 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, deactivate the menu and invoke the callback */
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, *active_menu = window->ActiveMenu; /* active menu is always the one with the mouse in it, due to fghCheckMenuStatus */
SFG_MenuEntry *active_entry = active_menu->ActiveEntry; /* currently highlighted item -> must be the one that was just clicked */
SFG_Window *parent_window = window->ActiveMenu->ParentWindow;
/* ignore clicks on the submenu entry */
if (!active_entry->SubMenu)
{
fgSetWindow( parent_window );
fgStructure.CurrentMenu = active_menu;
/* Deactivate menu and then call callback (we don't want menu to stay in view while callback is executing, and user should be able to change menus in callback) */
fgDeactivateMenu( parent_window );
active_menu->Callback( active_entry->ID );
/* Restore the current window and menu */
fgSetWindow( save_window );
fgStructure.CurrentMenu = save_menu;
}
is_clicked = GL_TRUE; /* Don't reopen... */
}
else if( pressed )
/*
* Outside the menu, deactivate if it's a downclick
*
* A downclick outside of the interior of our freeglut windows
* is dealt with in the WM_KILLFOCUS handler of fgPlatformWindowProc
*/
{
fgDeactivateMenu( window->ActiveMenu->ParentWindow );
/* Could reopen again in different location, as is_clicked remains false */
}
is_handled = GL_TRUE;
}
else if ( fgState.ActiveMenus ) /* Don't have to check whether this was a downpress or an uppress, there is no way to get an uppress in another window before a downpress... */
{
/* if another window than the one clicked in has an open menu, close it */
SFG_Menu *menu = fgGetActiveMenu();
if ( menu ) /* any open menu? */
fgDeactivateMenu( menu->ParentWindow );
/* Leave is_handled to false, we didn't do anything relevant from the perspective of the window that was clicked */
}
/* No active menu, let's check whether we need to activate one. */
if( !is_clicked &&
( 0 <= button ) &&
( FREEGLUT_MAX_MENUS > button ) &&
( window->Menu[ button ] ) &&
pressed )
{
/* If mouseclick was outside the parent window, ignore. This can
* happen when another mouse button is already depressed and the
* window thus has mouse capture
*/
if (window->State.MouseX>0 && window->State.MouseY>0 &&
window->State.MouseX<window->State.Width && window->State.MouseY<window->State.Height)
{
fghActivateMenu( window, button );
is_handled = GL_TRUE;
}
}
return is_handled;
}
