MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Dokumentacja Pobierz pdf (Strona 207)

An Address Book Reader

5-41

% last element in the Addresses array

if i < 1

i = length(Addresses);

end

case 'Next'

% Increase the index by one

i = index + 1;

% If the index is greater than the size of the array then point

% to the first item in the Addresses array

if i > length(Addresses)

i = 1;

end

% Get the appropriate data for the index in selected

Current_Name = Addresses(i).Name;

Current_Phone = Addresses(i).Phone;

set(handles.Contact_Name,'string',Current_Name)

set(handles.Contact_Phone,'string',Current_Phone)

% Update the index pointer to reflect the new index

handles.Index = i;

guidata(hObject, handles)

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.

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