MATLAB SIMULINK 7 - GRAPHICAL USER INTERFACE Uživatelský manuál stáhnout pdf (Strana 42)

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101

2 Creating a GUI with GUIDE

2-22

index of the selected string. The pop-up menu callback reads the pop-up menu

Value property to determine what item is currently displayed and sets

handles.current_data accordingly.

1 Display the pop-up menu callback in the M-file editor. Right click the pop-up

menu component in the Layout Editor to display a context menu. From that

menu, select

View Callbacks -> Callback.

The GUI M-file opens in the editor if it is not already open, and the cursor

moves to the pop-menu callback which already contains this code:

% --- Executes on selection change in popupmenu1.

function popupmenu1_Callback(hObject, eventdata, handles)

% hObject handle to popupmenu1 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

2 Add the following code to the popupmenu1_Callback after the comment that

begins

% handles...

This code first retrieves two pop-up menu properties:

String – a cell array that contains the menu contents

Value – the index into the menu contents of the selected data set.

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