How to determine if pushbutton/callback is pressed?

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Jan Michael Manalac
Jan Michael Manalac on 5 Jun 2016
Commented: Image Analyst on 20 Feb 2018
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!

Answers (2)

Shameer Parmar
Shameer Parmar on 10 Jun 2016
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
  2 Comments
Image Analyst
Image Analyst on 31 Oct 2016
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;

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Image Analyst
Image Analyst on 5 Jun 2016
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.
  2 Comments
Image Analyst
Image Analyst on 20 Feb 2018
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'));

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