We will begin the design by outlining the desired menu system and the functions to be performed by each of the menu elements. The menu system resides in a PANEL that contains a PRINTER output widget.
When you select an element of a menu a string indicating the menu selection is dumped to the PRINTER widget. This feedback mechanism allows you to verify if the menus are working as expected. The following figure shows the desired main panel with menus and elements of each pulldown menu.
Main Panel Display
The menu widget PullDown_1 expands as follows:
Button_1
Separator
Cascade_1
Item_1
Item_2
Item_3
Cascade_2
Toggle_1
Toggle_2 Toggle_3
Cascade_3
Toggle_1
Button_1
Cascade_1 and Cascade_2 are "attachment points" for other menus. The elements labeled Toggle_1, Toggle_2, etc. should toggle when selected, which is indicated bythe presence or absence of a "checkmark" in front of the button label.
The second top-level menu PullDown_2 expands into:
·
Button_1
·
Button_2
The third top-level menu PullDown_3 contains:
·
Button_1
·
Button_2
·
Button_3
·
Separator
·
Quit
The Separator in the first and third pulldown menus performs no other function than
