MATLAB Creating Graphical User Interfaces

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)

% Hints: contents = cellstr(get(hObject,'String')) returns contents...

% contents{get(hObject,'Value')} returns selected item...

items = get(hObject,'String');

index_selected = get(hObject,'Value');

item_selected = items{index_selected};

display(item_selected);

When the user selects an item in the pop-up menu, the callback function performs the

following tasks:

• Gets all the items in the pop-up menu and stores them in the variable, items.


• Gets the numeric index of the selected item and stores it in the variable,
  index_selected.


• Gets the value of the selected item and stores it in the variable, item_selected.


• Displays the selected item in the MATLAB Command Window.

Panel

Make the Panel Respond to Button Clicks

You can create a callback function that executes when the end user right-clicks or left-

clicks on the panel. If you are working in GUIDE, then right-click the panel in the layout

and select View Callbacks > ButtonDownFcn to create the callback function.

This code is an example of a ButtonDownFcn callback in GUIDE.

function uipanel1_ButtonDownFcn(hObject, eventdata, handles)

% hObject handle to uipanel1 (see GCBO)

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

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

display('Mouse button was pressed');

When the end user clicks on the panel, this function displays the text, 'Mouse button

was pressed', in the Command Window.

7 Programming a GUIDE App