/* Copyright (c) Mark J. Kilgard, 1994. */ /* This program is freely distributable without licensing fees and is provided without guarantee or warrantee expressed or implied. This program is -not- in the public domain. */ #include #include #include #include #include #include #include #include /* for XC_arrow */ #include #include "glutint.h" #include "layerutil.h" GLUTmenu *__glutCurrentMenu = NULL; void (*__glutMenuStatusFunc) (int, int, int); GLUTmenu *__glutMappedMenu; GLUTwindow *__glutMenuWindow; GLUTmenuItem *__glutItemSelected; static GLUTmenu **menuList = NULL; static int menuListSize = 0; static XFontStruct *menuFont = NULL; static Cursor menuCursor; static Colormap menuColormap; static Visual *menuVisual; static int menuDepth; static int fontHeight; static GC blackGC, grayGC, whiteGC; static unsigned long menuBlack, menuWhite, menuGray; static unsigned long useSaveUnders; /* A replacement for XAllocColor (originally by Brian Paul). This function should never fail to allocate a color. When XAllocColor fails, we return the nearest matching color. If we have to allocate many colors this function isn't a great solution; the XQueryColors() could be done just once. */ static void noFaultXAllocColor(Display * dpy, Colormap cmap, int cmapSize, XColor * color) { XColor *ctable, subColor; int i, bestmatch; double mindist; /* 3*2^16^2 exceeds long int precision. */ for (;;) { /* First try just using XAllocColor. */ if (XAllocColor(dpy, cmap, color)) return; /* Retrieve color table entries. */ /* XXX alloca canidate. */ ctable = (XColor *) malloc(cmapSize * sizeof(XColor)); for (i = 0; i < cmapSize; i++) ctable[i].pixel = i; XQueryColors(dpy, cmap, ctable, cmapSize); /* Find best match. */ bestmatch = -1; mindist = 0.0; for (i = 0; i < cmapSize; i++) { double dr = (double) color->red - (double) ctable[i].red; double dg = (double) color->green - (double) ctable[i].green; double db = (double) color->blue - (double) ctable[i].blue; double dist = dr * dr + dg * dg + db * db; if (bestmatch < 0 || dist < mindist) { bestmatch = i; mindist = dist; } } /* Return result. */ subColor.red = ctable[bestmatch].red; subColor.green = ctable[bestmatch].green; subColor.blue = ctable[bestmatch].blue; free(ctable); if (XAllocColor(dpy, cmap, &subColor)) { *color = subColor; return; } /* Extremely unlikely, but possibly color was deallocated and reallocated by someone else before we could XAllocColor the color cell we located. If so, loop again... */ } } static void menuVisualSetup(void) { XLayerVisualInfo template, *visual, *overlayVisuals; XColor color; Status status; Bool presumablyMesa; int layer, nVisuals, i, dummy; for (layer = 3; layer > 0; layer--) { template.layer = layer; template.vinfo.screen = __glutScreen; overlayVisuals = __glutXGetLayerVisualInfo(__glutDisplay, VisualScreenMask | VisualLayerMask, &template, &nVisuals); if (overlayVisuals) { for (i = 0; i < nVisuals; i++) { visual = &overlayVisuals[i]; if (visual->vinfo.colormap_size >= 3) { menuColormap = XCreateColormap(__glutDisplay, __glutRoot, visual->vinfo.visual, AllocNone); /* Allocate overlay colormap cells in defined order: gray, black, white to match the IRIS GL allocation scheme. Increases likelihood of less overlay colormap flashing. */ /* XXX nice if these 3 AllocColor's could be done in one protocol round-trip */ color.red = color.green = color.blue = 0xaa00; status = XAllocColor(__glutDisplay, menuColormap, &color); if (!status) { XFreeColormap(__glutDisplay, menuColormap); continue; } menuGray = color.pixel; color.red = color.green = color.blue = 0x0000; status = XAllocColor(__glutDisplay, menuColormap, &color); if (!status) { XFreeColormap(__glutDisplay, menuColormap); continue; } menuBlack = color.pixel; color.red = color.green = color.blue = 0xffff; status = XAllocColor(__glutDisplay, menuColormap, &color); if (!status) { XFreeColormap(__glutDisplay, menuColormap); continue; } menuWhite = color.pixel; menuVisual = visual->vinfo.visual; menuDepth = visual->vinfo.depth; /* If using overlays, avoid requesting "save unders". */ useSaveUnders = 0; XFree(overlayVisuals); return; } } XFree(overlayVisuals); } } /* settle for default visual */ menuVisual = DefaultVisual(__glutDisplay, __glutScreen); menuDepth = DefaultDepth(__glutDisplay, __glutScreen); menuColormap = DefaultColormap(__glutDisplay, __glutScreen); menuBlack = BlackPixel(__glutDisplay, __glutScreen); menuWhite = WhitePixel(__glutDisplay, __glutScreen); color.red = color.green = color.blue = 0xaa00; noFaultXAllocColor(__glutDisplay, menuColormap, menuVisual->map_entries, &color); menuGray = color.pixel; /* When no overlays are supported, we would like to use X "save unders" to avoid exposes to windows obscured by pop-up menus. However, OpenGL's direct rendering support means OpenGL interacts poorly with X backing store and save unders. X servers do not (in implementation practice) redirect OpenGL rendering destined to obscured window regions into backing store. Implementation solutions exist for this problem, but they are expensive and high-end OpenGL implementations typically provide fast rendering and/or overlays to obviate the problem associated of user interfaces (pop-up menus) forcing redraws of complex normal plane scenes. (See support for overlays pop-up menus above.) Mesa 3D, however, does not support direct rendering. Overlays are often unavailable to Mesa, and Mesa is also relatively slow. For these reasons, Mesa-rendering GLUT programs can and should use X save unders. Look for the GLX extension. If _not_ supported, we are presumably using Mesa so enable save unders. */ presumablyMesa = !XQueryExtension(__glutDisplay, "GLX", &dummy, &dummy, &dummy); if (presumablyMesa) useSaveUnders = CWSaveUnder; else useSaveUnders = 0; } static void menuSetup(void) { if (menuFont) { /* menuFont overload to indicate menu initalization */ return; } menuFont = XLoadQueryFont(__glutDisplay, "-*-helvetica-bold-o-normal--14-*-*-*-p-*-iso8859-1"); if (!menuFont) { /* try back up font */ menuFont = XLoadQueryFont(__glutDisplay, "fixed"); } if (!menuFont) { __glutFatalError("could not load font."); } menuVisualSetup(); fontHeight = menuFont->ascent + menuFont->descent; menuCursor = XCreateFontCursor(__glutDisplay, XC_arrow); } static void menuGraphicsContextSetup(Window win) { XGCValues gcvals; if (blackGC != None) return; gcvals.font = menuFont->fid; gcvals.foreground = menuBlack; blackGC = XCreateGC(__glutDisplay, win, GCFont | GCForeground, &gcvals); gcvals.foreground = menuGray; grayGC = XCreateGC(__glutDisplay, win, GCForeground, &gcvals); gcvals.foreground = menuWhite; whiteGC = XCreateGC(__glutDisplay, win, GCForeground, &gcvals); } /* OBSOLETE - use glutMenuStatusFunc instead. */ void glutMenuStateFunc(GLUTmenuStateCB menuStateFunc) { __glutMenuStatusFunc = (GLUTmenuStatusCB) menuStateFunc; } void glutMenuStatusFunc(GLUTmenuStatusCB menuStatusFunc) { __glutMenuStatusFunc = menuStatusFunc; } void __glutSetMenu(GLUTmenu * menu) { __glutCurrentMenu = menu; } static void unmapMenu(GLUTmenu * menu) { if (menu->cascade) { unmapMenu(menu->cascade); menu->cascade = NULL; } menu->anchor = NULL; menu->highlighted = NULL; XUnmapWindow(__glutDisplay, menu->win); } void __glutFinishMenu(Window win, int x, int y) { Window dummy; int rc; unmapMenu(__glutMappedMenu); XUngrabPointer(__glutDisplay, CurrentTime); /* This XFlush is needed to to make sure the pointer is really ungrabbed when the application's menu callback is called. Otherwise, a deadlock might happen because the application may try to read from an terminal window, but yet the ungrab hasn't really happened since it hasn't been flushed out. */ XFlush(__glutDisplay); if (__glutMenuStatusFunc) { if (win != __glutMenuWindow->win) { /* The button release may have occurred in a window other than the window requesting the pop-up menu (for example, one of the submenu windows). In this case, we need to translate the coordinates into the coordinate system of the window associated with the window. */ rc = XTranslateCoordinates(__glutDisplay, win, __glutMenuWindow->win, x, y, &x, &y, &dummy); assert(rc != False); /* Will always be on same screen. */ } __glutSetWindow(__glutMenuWindow); __glutSetMenu(__glutMappedMenu); /* Setting __glutMappedMenu to NULL permits operations that change menus or destroy the menu window again. */ __glutMappedMenu = NULL; __glutMenuStatusFunc(GLUT_MENU_NOT_IN_USE, x, y); } /* Setting __glutMappedMenu to NULL permits operations that change menus or destroy the menu window again. */ __glutMappedMenu = NULL; /* If an item is selected and it is not a submenu trigger, generate menu callback. */ if (__glutItemSelected && !__glutItemSelected->isTrigger) { __glutSetWindow(__glutMenuWindow); /* When menu callback is triggered, current menu should be set to the callback menu. */ __glutSetMenu(__glutItemSelected->menu); __glutItemSelected->menu->select( __glutItemSelected->value); } __glutMenuWindow = NULL; } #define MENU_BORDER 1 #define MENU_GAP 2 #define MENU_ARROW_GAP 6 #define MENU_ARROW_WIDTH 8 static void mapMenu(GLUTmenu * menu, int x, int y) { XWindowChanges changes; unsigned int mask; int subMenuExtension, num; /* If there are submenus, we need to provide extra space for the submenu pull arrow. */ if (menu->submenus > 0) { subMenuExtension = MENU_ARROW_GAP + MENU_ARROW_WIDTH; } else { subMenuExtension = 0; } changes.stack_mode = Above; mask = CWStackMode | CWX | CWY; /* If the menu isn't managed (ie, validated so all the InputOnly subwindows are the right size), do so. */ if (!menu->managed) { GLUTmenuItem *item; item = menu->list; num = menu->num; while (item) { XWindowChanges itemupdate; itemupdate.y = (num - 1) * fontHeight + MENU_GAP; itemupdate.width = menu->pixwidth; itemupdate.width += subMenuExtension; XConfigureWindow(__glutDisplay, item->win, CWWidth | CWY, &itemupdate); item = item->next; num--; } menu->pixheight = MENU_GAP + fontHeight * menu->num + MENU_GAP; changes.height = menu->pixheight; changes.width = MENU_GAP + menu->pixwidth + subMenuExtension + MENU_GAP; mask |= CWWidth | CWHeight; menu->managed = True; } /* make sure menu appears fully on screen */ if (y + menu->pixheight >= __glutScreenHeight) { changes.y = __glutScreenHeight - menu->pixheight; } else { changes.y = y; } if (x + menu->pixwidth + subMenuExtension >= __glutScreenWidth) { changes.x = __glutScreenWidth - menu->pixwidth + subMenuExtension; } else { changes.x = x; } /* Rember where the menu is placed so submenus can be properly placed relative to it. */ menu->x = changes.x; menu->y = changes.y; XConfigureWindow(__glutDisplay, menu->win, mask, &changes); XInstallColormap(__glutDisplay, menuColormap); /* XXX The XRaiseWindow below should not be necessary because the XConfigureWindow requests an Above stack mode (same as XRaiseWindow), but some Sun users complained this was still necessary. Probably some window manager or X server bug on these machines?? */ XRaiseWindow(__glutDisplay, menu->win); XMapWindow(__glutDisplay, menu->win); } void __glutStartMenu(GLUTmenu * menu, GLUTwindow * window, int x, int y, int x_win, int y_win) { int grab; assert(__glutMappedMenu == NULL); grab = XGrabPointer(__glutDisplay, __glutRoot, True, ButtonPressMask | ButtonReleaseMask, GrabModeAsync, GrabModeAsync, __glutRoot, menuCursor, CurrentTime); if (grab != GrabSuccess) { /* Somebody else has pointer grabbed, ignore menu activation. */ return; } __glutMappedMenu = menu; __glutMenuWindow = window; __glutItemSelected = NULL; if (__glutMenuStatusFunc) { __glutSetMenu(menu); __glutSetWindow(window); __glutMenuStatusFunc(GLUT_MENU_IN_USE, x_win, y_win); } mapMenu(menu, x, y); } static void paintSubMenuArrow(Window win, int x, int y) { XPoint p[5]; p[0].x = p[4].x = x; p[0].y = p[4].y = y - menuFont->ascent + 1; p[1].x = p[0].x + MENU_ARROW_WIDTH - 1; p[1].y = p[0].y + (menuFont->ascent / 2) - 1; p[2].x = p[1].x; p[2].y = p[1].y + 1; p[3].x = p[0].x; p[3].y = p[0].y + menuFont->ascent - 2; XFillPolygon(__glutDisplay, win, whiteGC, p, 4, Convex, CoordModeOrigin); XDrawLines(__glutDisplay, win, blackGC, p, 5, CoordModeOrigin); } static void paintMenuItem(GLUTmenuItem * item, int num) { Window win = item->menu->win; GC gc; int y; int subMenuExtension; if (item->menu->submenus > 0) { subMenuExtension = MENU_ARROW_GAP + MENU_ARROW_WIDTH; } else { subMenuExtension = 0; } if (item->menu->highlighted == item) { gc = whiteGC; } else { gc = grayGC; } y = MENU_GAP + fontHeight * num - menuFont->descent; XFillRectangle(__glutDisplay, win, gc, MENU_GAP, y - fontHeight + menuFont->descent, item->menu->pixwidth + subMenuExtension, fontHeight); XDrawString(__glutDisplay, win, blackGC, MENU_GAP, y, item->label, item->len); if (item->isTrigger) { paintSubMenuArrow(win, item->menu->pixwidth + MENU_ARROW_GAP + 1, y); } } void __glutPaintMenu(GLUTmenu * menu) { GLUTmenuItem *item; int i = menu->num; int y = MENU_GAP + fontHeight * i - menuFont->descent; item = menu->list; while (item) { if (item->menu->highlighted == item) { paintMenuItem(item, i); } else { /* quick render of the menu item; assume background already cleared to gray */ XDrawString(__glutDisplay, menu->win, blackGC, 2, y, item->label, item->len); if (item->isTrigger) { paintSubMenuArrow(menu->win, menu->pixwidth + MENU_ARROW_GAP + 1, y); } } i--; y -= fontHeight; item = item->next; } } GLUTmenuItem * __glutGetMenuItem(GLUTmenu * menu, Window win, int *which) { GLUTmenuItem *item; int i; i = menu->num; item = menu->list; while (item) { if (item->win == win) { *which = i; return item; } if (item->isTrigger) { GLUTmenuItem *subitem; subitem = __glutGetMenuItem(menuList[item->value], win, which); if (subitem) { return subitem; } } i--; item = item->next; } return NULL; } static int getMenuItemIndex(GLUTmenuItem * item) { int count = 0; while (item) { count++; item = item->next; } return count; } GLUTmenu * __glutGetMenu(Window win) { GLUTmenu *menu; menu = __glutMappedMenu; while (menu) { if (win == menu->win) { return menu; } menu = menu->cascade; } return NULL; } GLUTmenu * __glutGetMenuByNum(int menunum) { if (menunum < 1 || menunum > menuListSize) { return NULL; } return menuList[menunum - 1]; } static int getUnusedMenuSlot(void) { int i; /* Look for allocated, unused slot. */ for (i = 0; i < menuListSize; i++) { if (!menuList[i]) { return i; } } /* Allocate a new slot. */ menuListSize++; if (menuList) { menuList = (GLUTmenu **) realloc(menuList, menuListSize * sizeof(GLUTmenu *)); } else { /* XXX Some realloc's do not correctly perform a malloc when asked to perform a realloc on a NULL pointer, though the ANSI C library spec requires this. */ menuList = (GLUTmenu **) malloc(sizeof(GLUTmenu *)); } if (!menuList) __glutFatalError("out of memory."); menuList[menuListSize - 1] = NULL; return menuListSize - 1; } static void menuModificationError(void) { /* XXX Remove the warning after GLUT 3.0. */ __glutWarning("The following is a new check for GLUT 3.0; update your code."); __glutFatalError("menu manipulation not allowed while menus in use"); } int glutCreateMenu(GLUTselectCB selectFunc) { XSetWindowAttributes wa; GLUTmenu *menu; int menuid; if (__glutMappedMenu) menuModificationError(); if (!__glutDisplay) __glutOpenXConnection(NULL); menuid = getUnusedMenuSlot(); menu = (GLUTmenu *) malloc(sizeof(GLUTmenu)); if (!menu) __glutFatalError("out of memory."); menu->id = menuid; menu->num = 0; menu->submenus = 0; menu->managed = False; menu->pixwidth = 0; menu->select = selectFunc; menu->list = NULL; menu->cascade = NULL; menu->highlighted = NULL; menu->anchor = NULL; menuSetup(); wa.override_redirect = True; wa.background_pixel = menuGray; wa.border_pixel = menuBlack; wa.colormap = menuColormap; wa.event_mask = StructureNotifyMask | ExposureMask | ButtonPressMask | ButtonReleaseMask | EnterWindowMask | LeaveWindowMask; /* Save unders really only enabled if useSaveUnders is set to CWSaveUnder, ie. using Mesa 3D. See earlier comments. */ wa.save_under = True; menu->win = XCreateWindow(__glutDisplay, __glutRoot, /* real position determined when mapped */ 0, 0, /* real size will be determined when menu is manged */ 1, 1, MENU_BORDER, menuDepth, InputOutput, menuVisual, CWOverrideRedirect | CWBackPixel | CWBorderPixel | CWEventMask | CWColormap | useSaveUnders, &wa); menuGraphicsContextSetup(menu->win); menuList[menuid] = menu; __glutSetMenu(menu); return menuid + 1; } void glutDestroyMenu(int menunum) { GLUTmenu *menu = __glutGetMenuByNum(menunum); GLUTmenuItem *item, *next; if (__glutMappedMenu) menuModificationError(); assert(menu->id == menunum - 1); XDestroySubwindows(__glutDisplay, menu->win); XDestroyWindow(__glutDisplay, menu->win); menuList[menunum - 1] = NULL; /* free all menu entries */ item = menu->list; while (item) { assert(item->menu == menu); next = item->next; free(item->label); free(item); item = next; } if (__glutCurrentMenu == menu) { __glutCurrentMenu = NULL; } free(menu); } int glutGetMenu(void) { if (__glutCurrentMenu) { return __glutCurrentMenu->id + 1; } else { return 0; } } void glutSetMenu(int menuid) { GLUTmenu *menu; if (menuid < 1 || menuid > menuListSize) { __glutWarning("glutSetMenu attempted on bogus menu."); return; } menu = menuList[menuid - 1]; if (!menu) { __glutWarning("glutSetMenu attempted on bogus menu."); return; } __glutSetMenu(menu); } static void setMenuItem(GLUTmenuItem * item, char *label, int value, Bool isTrigger) { GLUTmenu *menu; menu = item->menu; item->label = strdup(label); if (!item->label) __glutFatalError("out of memory."); item->isTrigger = isTrigger; item->len = (int) strlen(label); item->value = value; item->pixwidth = XTextWidth(menuFont, label, item->len) + 4; if (item->pixwidth > menu->pixwidth) { menu->pixwidth = item->pixwidth; } menu->managed = False; } void glutAddMenuEntry(char *label, int value) { XSetWindowAttributes wa; GLUTmenuItem *entry; if (__glutMappedMenu) menuModificationError(); entry = (GLUTmenuItem *) malloc(sizeof(GLUTmenuItem)); if (!entry) __glutFatalError("out of memory."); entry->menu = __glutCurrentMenu; setMenuItem(entry, label, value, False); wa.event_mask = EnterWindowMask | LeaveWindowMask; entry->win = XCreateWindow(__glutDisplay, __glutCurrentMenu->win, MENU_GAP, __glutCurrentMenu->num * fontHeight + MENU_GAP, /* x & y */ entry->pixwidth, fontHeight, /* width & height */ 0, CopyFromParent, InputOnly, CopyFromParent, CWEventMask, &wa); XMapWindow(__glutDisplay, entry->win); __glutCurrentMenu->num++; entry->next = __glutCurrentMenu->list; __glutCurrentMenu->list = entry; } void glutAddSubMenu(char *label, int menu) { XSetWindowAttributes wa; GLUTmenuItem *submenu; if (__glutMappedMenu) menuModificationError(); submenu = (GLUTmenuItem *) malloc(sizeof(GLUTmenuItem)); if (!submenu) __glutFatalError("out of memory."); __glutCurrentMenu->submenus++; submenu->menu = __glutCurrentMenu; setMenuItem(submenu, label, /* base 0 */ menu - 1, True); wa.event_mask = EnterWindowMask | LeaveWindowMask; submenu->win = XCreateWindow(__glutDisplay, __glutCurrentMenu->win, MENU_GAP, __glutCurrentMenu->num * fontHeight + MENU_GAP, /* x & y */ submenu->pixwidth, fontHeight, /* width & height */ 0, CopyFromParent, InputOnly, CopyFromParent, CWEventMask, &wa); XMapWindow(__glutDisplay, submenu->win); __glutCurrentMenu->num++; submenu->next = __glutCurrentMenu->list; __glutCurrentMenu->list = submenu; } void glutChangeToMenuEntry(int num, char *label, int value) { GLUTmenuItem *item; int i; if (__glutMappedMenu) menuModificationError(); i = __glutCurrentMenu->num; item = __glutCurrentMenu->list; while (item) { if (i == num) { if (item->isTrigger) { /* If changing a submenu trigger to a menu entry, we need to account for submenus. */ item->menu->submenus--; } free(item->label); setMenuItem(item, label, value, False); return; } i--; item = item->next; } __glutWarning("Current menu has no %d item.", num); } void glutChangeToSubMenu(int num, char *label, int menu) { GLUTmenuItem *item; int i; if (__glutMappedMenu) menuModificationError(); i = __glutCurrentMenu->num; item = __glutCurrentMenu->list; while (item) { if (i == num) { if (!item->isTrigger) { /* If changing a menu entry to as submenu trigger, we need to account for submenus. */ item->menu->submenus++; } free(item->label); setMenuItem(item, label, /* base 0 */ menu - 1, True); return; } i--; item = item->next; } __glutWarning("Current menu has no %d item.", num); } void glutRemoveMenuItem(int num) { GLUTmenuItem *item, **prev, *remaining; int pixwidth, i; if (__glutMappedMenu) menuModificationError(); i = __glutCurrentMenu->num; prev = &__glutCurrentMenu->list; item = __glutCurrentMenu->list; /* If menu item is removed, the menu's pixwidth may need to be recomputed. */ pixwidth = 0; while (item) { if (i == num) { /* If this menu item's pixwidth is as wide as the menu's pixwidth, removing this menu item will necessitate shrinking the menu's pixwidth. */ if (item->pixwidth >= __glutCurrentMenu->pixwidth) { /* Continue recalculating menu pixwidth, first skipping the removed item. */ remaining = item->next; while (remaining) { if (remaining->pixwidth > pixwidth) { pixwidth = remaining->pixwidth; } remaining = remaining->next; } } __glutCurrentMenu->num--; __glutCurrentMenu->managed = False; __glutCurrentMenu->pixwidth = pixwidth; /* Patch up menu's item list. */ *prev = item->next; free(item->label); free(item); return; } if (item->pixwidth > pixwidth) { pixwidth = item->pixwidth; } i--; prev = &item->next; item = item->next; } __glutWarning("Current menu has no %d item.", num); } void glutAttachMenu(int button) { if (__glutMappedMenu) menuModificationError(); if (__glutCurrentWindow->menu[button] < 1) { __glutCurrentWindow->buttonUses++; } __glutChangeWindowEventMask( ButtonPressMask | ButtonReleaseMask, True); __glutCurrentWindow->menu[button] = __glutCurrentMenu->id + 1; } void glutDetachMenu(int button) { if (__glutMappedMenu) menuModificationError(); if (__glutCurrentWindow->menu[button] > 0) { __glutCurrentWindow->buttonUses--; __glutChangeWindowEventMask(ButtonPressMask | ButtonReleaseMask, __glutCurrentWindow->buttonUses > 0); __glutCurrentWindow->menu[button] = 0; } } void __glutMenuItemEnterOrLeave(GLUTmenuItem * item, int num, int type) { int alreadyUp = 0; if (type == EnterNotify) { GLUTmenuItem *prevItem = item->menu->highlighted; if (prevItem && prevItem != item) { /* If there's an already higlighted item in this menu that is different from this one (we could be re-entering an item with an already cascaded submenu!), unhighlight the previous item. */ item->menu->highlighted = NULL; paintMenuItem(prevItem, getMenuItemIndex(prevItem)); } item->menu->highlighted = item; __glutItemSelected = item; if (item->menu->cascade) { if (!item->isTrigger) { /* Entered a menu item that is not a submenu trigger, so pop down the current submenu cascade of this menu. */ unmapMenu(item->menu->cascade); item->menu->cascade = NULL; } else { GLUTmenu *submenu = menuList[item->value]; if (submenu->anchor == item) { /* We entered the submenu trigger for the submenu that is already up, so don't take down the submenu. */ alreadyUp = 1; } else { /* Submenu already popped up for some other submenu item of this menu; need to pop down that other submenu cascade. */ unmapMenu(item->menu->cascade); item->menu->cascade = NULL; } } } if (!alreadyUp) { /* Make sure the menu item gets painted with highlighting. */ paintMenuItem(item, num); } else { /* If already up, should already be highlighted. */ } } else { /* LeaveNotify: Handle leaving a menu item... */ if (item->menu->cascade && item->menu->cascade->anchor == item) { /* If there is a submenu casacaded from this item, do not change the highlighting on this item upon leaving. */ } else { /* Unhighlight this menu item. */ item->menu->highlighted = NULL; paintMenuItem(item, num); } __glutItemSelected = NULL; } if (item->isTrigger) { if (type == EnterNotify && !alreadyUp) { GLUTmenu *submenu = menuList[item->value]; mapMenu(submenu, item->menu->x + item->menu->pixwidth + MENU_ARROW_GAP + MENU_ARROW_WIDTH + MENU_GAP + MENU_BORDER, item->menu->y + fontHeight * (num - 1) + MENU_GAP); item->menu->cascade = submenu; submenu->anchor = item; } } }