MATLAB: Change multiple push buttons with one push button

matlab gui

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!

Best Answer

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
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