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how to get which button was pressed?

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Stepan Vecera
Stepan Vecera on 4 May 2021
Edited: Adam Danz on 5 May 2021
im trying to recreate minesweeper. i have array of buttons, and now i want to know, whitch button was pressed(so i can look around it, to know how many bomb are around).
this is how i create the array
w=9;
h=9;
setappdata(fig, 'fieldSize', [w, h]);
fS = getappdata(fig, 'fieldSize');
str.txtObj = gobjects(fS);
for iR=1:w
for iC = 1:h
button(iR, iC) = uicontrol(panel, ...
'Style', 'pushbutton', ...
'Units', 'normalized', ...
'Position', [(iC-1)*1/fS(2), 1-iR*1/fS(1), 1/fS(2), 1/fS(1)], ...
'String', ' ', ...
'Callback', @buttonPushed, ...
'Tag', ' ');
end
end

Answers (2)

Adam Danz
Adam Danz on 4 May 2021
The first input to the buttonPushed callback function is the object handle to the button that was pushed. The object handles is also in the second input in event.Source where event is the name of the 2nd input.
If you need additional methods to ID the button, you can assign a tag property to each button and access the tag from within the callback function.

Jan
Jan on 4 May 2021
Edited: Jan on 4 May 2021
You can provide the index as additional argument of the callback:
'Callback', {@buttonPushed, iR, iC}, ...
function buttonPushed(ButtonH, EventData, iR, iC)
end
Or you store the array button in the figure:
for iR=1:w
for iC = 1:h
button(iR, iC) = uicontrol(panel, ...
...
end
end
setappdata(fig, 'button', button);
function buttonPushed(ButtonH, EventData)
fig = ancestor(ButtonH, 'figure');
button = getappdata(fig, 'button');
[iR, iC] = find(ButtonH == button);
  4 Comments
Adam Danz
Adam Danz on 5 May 2021
That sounds like what my answer suggests. " you can assign a tag property to each button and access the tag from within the callback function"

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