MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Manual do Utilizador descarregar pdf (Página 259)

100

101

UI That Uses Persistent Data

9-13

switch Answer

case 'Yes'

Addresses(end+1).Name = Current_Name; % Grow array by 1

Addresses(end).Phone = Current_Phone;

index = length(Addresses);

handles.Addresses = Addresses;

handles.Index = index;

guidata(hObject,handles)

return

case 'Cancel'

% Revert back to the original number

set(handles.Contact_Name,'string',Addresses(handles.Index).Name)

set(handles.Contact_Phone,'String',Addresses(handles.Index).Phone)

return

end

Data Update Confirmation

The Contact Phone # text box displays the phone number of the entry listed in the

Contact Name text box. If you type in a new number and click one of the push buttons,

“Contact_Phone_Callback” on page 9-13 in address_book.m opens a question dialog

box that asks you if you want to change the existing number or cancel your change.

This callback uses the index pointer (handles.Index) to update the new number in the

address book and to revert to the previously displayed number if you click Cancel in the

question dialog box. Both the current address book and the index pointer are saved in the

handles structure so that this data is available to other callbacks.

Contact_Phone_Callback

function Contact_Phone_Callback(hObject, eventdata, handles, varargin)

Current_Phone = get(handles.Contact_Phone,'string');

% If either one is empty then return

if isempty(Current_Phone)

return

end

% Get the current list of addresses from the handles structure

Addresses = handles.Addresses;

Answer=questdlg('Do you want to change the phone number?', ...

'Change Phone Number', ...

'Yes','Cancel','Yes');

switch Answer

1 2 ... 254 255 256 257 258 259 260 261 262 263 264 ... 499 500

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