Creating Graphical User Interfaces    

Saving Changes to the Address Book from the Menu

When you make changes to an address book, you need to save the current MAT-file, or save it as a new MAT-file. The File submenus Save and Save As enable you to do this. These menus, created with the Menu Editor, use the same callback, Save_Callback.

The callback uses the menu Tag property to identify whether Save or Save As is the callback object (i.e., the object whose handle is passed in as the first argument to the callback function). You specify the menu's Tag property with the Menu Editor.

Saving the Addresses Structure

The handles structure contains the Addresses structure, which you must save (handles.Addresses) as well as the name of the currently loaded MAT-file (handles.LastFile). When the user makes changes to the name or number, the Contact_Name_Callback or the Contact_Phone_Callback updates handles.Addresses.

Saving the MAT-File

If the user selects Save, the save command is called to save the current MAT-file with the new names and phone numbers.

If the user selects Save As, a dialog is displayed (uiputfile) that enables the user to select the name of an existing MAT-file or specify a new file. The dialog returns the selected filename and path. The final steps include

Save_Callback Code Listing

The Create New Menu

The Create New menu simply clears the Contact Name and Contact Phone # text fields to facilitate adding a new name and number. After making the new entries, the user must then save the address book with the Save or Save As menus. This callback sets the text String properties to empty strings:


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