Change multiple push buttons with one push button?

Hello!

I am trying to make a virtual keyboard but i can not make the "shift" button for upper letters.

This is the call back function for a key :

% --- Executes on button press in Q.

function Q_Callback(hObject, eventdata, handles)

str=get(handles.edit1,'String');

set(handles.edit1,'String',[str 'q']);

This is the call back function for shift button

% --- Executes on button press in Shift.

function Shift_Callback(hObject, eventdata, handles)

% hObject handle to Shift (see GCBO)

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

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

Can you help me to find a solution to change the normal letter into an upper one?

Thank you!

[Image Analyst]

Is shift a toggle push button or a regular push button? Are you using GUIDE or App Designer? Can you attach your full m-file and .fig or .mlapp file?

[gioia petrica]

I am using guide and it is a regular push button. Here is the m-file.

[Rik]

For general advice and examples for how to create a GUI (and avoid using GUIDE), have look at this thread.

Answer 1

[Rik]

You can make the shift callback change a flag. That flag should be stored in the guidata struct. In the other callbacks you can use it to switch between upper and lower case.

function Shift_Callback(hObject, eventdata, handles)
handles.ShiftIsPressed=~handles.ShiftIsPressed;%invert
guidata(hObject,handles)
end
function Q_Callback(hObject, eventdata, handles)
letter='q';
add_letter(handles,letter)
end
function add_letter(handles,letter)
if handles.ShiftIsPressed
    letter=upper(letter);
    %if you want to un-set shift, you can set it to false here
    %handles.ShiftIsPressed=false;
    %guidata(gcbf,handles)
end
str=get(handles.edit1,'String');
set(handles.edit1,'String',[str letter]);
end