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Full Discussion: Sub menu's
Top Forums UNIX for Dummies Questions & Answers Sub menu's Post 13590 by Jimbo on Sunday 20th of January 2002 10:29:34 AM
Old 01-20-2002
My demo menu does have sub-menus, but they are not full-blown working sub-menus, hence the "Directory Functions menu processing goes here" display. At time of post, I was just wanting to demo how a sub-menu would be called from a main loop, not what the sub-menu would need to do.

Your main case statement should not try to process the replies from the sub-menus. That case statement, on a single execution, will process only a single response, and that will be a main menu response.

Each sub-menu, after painting the screen, needs to do its own read/case processing, then fall out the bottom or do a return. Follow your script and you will see that it is executing as coded: main loop calls Filefunctions, which paints the screen, calls PressEnter (no read has been done yet), then falls back to the main loop which starts the next main menu cycle.

You could code the main loop in such a way that its read/case processing would handle the responses from all main/sub menus. But this would not be a typical approach, and not as easy to maintain as the more modular approach.

Also, Deletedirectory and Changedirectory have if-statements that are not closed out.
Jimbo
 

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glutMenuStatusFunc(3GLUT)					       GLUT						 glutMenuStatusFunc(3GLUT)

NAME
glutMenuStatusFunc - sets the global menu status callback. SYNTAX
void glutMenuStatusFunc(void (*func)(int status, int x, int y)); void glutMenuStateFunc(void (*func)(int status)); ARGUMENTS
func The new menu status (or state) callback function. DESCRIPTION
glutMenuStatusFunc sets the global menu status callback so a GLUT program can determine when a menu is in use or not. When a menu status callback is registered, it will be called with the value GLUT_MENU_IN_USE for its value parameter when pop-up menus are in use by the user; and the callback will be called with the value GLUT_MENU_NOT_IN_USE for its status parameter when pop-up menus are no longer in use. The x and y parameters indicate the location in window coordinates of the button press that caused the menu to go into use, or the location where the menu was released (may be outside the window). The func parameter names the callback function. Other callbacks continue to operate (except mouse motion callbacks) when pop-up menus are in use so the menu status callback allows a program to suspend animation or other tasks when menus are in use. The cascading and unmapping of sub-menus from an initial pop-up menu does not generate menu status callbacks. There is a single menu status callback for GLUT. When the menu status callback is called, the current menu will be set to the initial pop-up menu in both the GLUT_MENU_IN_USE and GLUT_MENU_NOT_IN_USE cases. The current window will be set to the window from which the initial menu was popped up from, also in both cases. Passing NULL to glutMenuStatusFunc disables the generation of the menu status callback. glutMenuStateFunc is a deprecated version of the glutMenuStatusFunc routine. The only difference is glutMenuStateFunc callback prototype does not deliver the two additional x and y coordinates. SEE ALSO
glutCreateMenu, glutCreateWindow AUTHOR
Mark J. Kilgard (mjk@nvidia.com) GLUT
3.7 glutMenuStatusFunc(3GLUT)
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