April 2002
Intermediate to advanced
416 pages
11h 50m
English
Content preview from Visual Basic® .NET Database Programming
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Menu Commands
Program EasyDraw’s File menu contains six commands besides the MRU list: New, Open, Save, Save As, Close, and Exit. The code shown in Listing 9.4 manages these functions.
Subroutine FileIsLoaded sets the program’s controls to an appropriate state depending on whether a drawing is loaded. If no drawing is loaded, the subroutine disables the File menu’s Close, Save, and Save As commands. It also makes the toolbar and drawing area invisible. If a drawing is loaded, the subroutine enables the File menu’s commands and makes the toolbar and drawing area visible.
When the user selects the File menu’s New command, the mnuFileNew_Click event handler executes. It calls DataSafe to see if it safe to discard the current data and exits if ...
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