How to determine if pushbutton/callback is pressed?

How do I determine if a callback was pressed in guide GUI?

Say I have 2 Callbacks and

If I press the first Callback, then

    function first_Callback(hObject, ..., ...)

    var1 = 1; % callback was pressed

    function second_Callback(hObject, ..., ...)

    if(var1 == 1)
        %code block

Thank You!

Answer 1

[Shameer Parmar]

Hi Jan,

Try for this:

 function pushbutton1_Callback(hObject, eventdata, handles)
 handles.First = 1;
 handles.Second = 0;
 clc;
 disp('Fist Button was pressed.');
 guidata(hObject, handles);

.

function pushbutton2_Callback(hObject, eventdata, handles)
handles.First = 0;
handles.Second = 1;
clc;
disp('Second Button was pressed.');
guidata(hObject, handles);

Once you add this logic and click on respective push button, the two variables handles.First and handles.Second will be created and assign with either 0 or 1 value. You can then use it in your logic to check which push button was pressed.

 if (handles.First==1 && handles.Second==0)
     disp('Fist Button was pressed.');
 elseif (handles.First==0 && handles.Second==1)
     disp('Second Button was pressed.');
 end

[Thanigaivel Raja T]

If both push buttons are not pressed, then handles.First will not have been defined. Then error message will be displayed by MATLAB.

[Image Analyst]

This does not describe Shameer's code. His code defines handles.First even if only one pushbutton is pressed. So it's not "both" as you said. The only problem would be is if "neither" is pressed. So to avoid that, you should put the following code in the OpeningFcn() function

% Indicate that neither pushbutton has been clicked yet:
handles.First = 0;
handles.Second = 0;

Answer 2

[Image Analyst]

Simply set a breakpoint at the first line of code in the callback. It should stop there if you interact with the GUI control.

If you don't know how to do that, please see this link, which will solve nearly every problem anyone might ever have in MATLAB.

http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/

[Ram]

similar problem. but i dont how to do?... kindly help or any suggestion in my code https://de.mathworks.com/matlabcentral/answers/383546-how-can-i-call-two-push-buttons-from-the-3rd-push-button-in-gui-without-disabling-any-pushbuttons

[Image Analyst]

Alternatively, as the first two lines of the callback you can have this:

fprintf('Now in the pushbutton callback.\n');
uiwait(helpdlg('Now in the pushbutton callback.\n'));