how to get which button was pressed?

Question

Stepan Vecera 2021-5-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/821575-how-to-get-which-button-was-pressed

编辑： Adam Danz 2021-5-5

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

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Answer 1

Adam Danz 2021-5-4

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https://ww2.mathworks.cn/matlabcentral/answers/821575-how-to-get-which-button-was-pressed#answer_691915

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.

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Answer 2

Jan 2021-5-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/821575-how-to-get-which-button-was-pressed#answer_692000

编辑：Jan 2021-5-4

在 MATLAB Online 中打开

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);

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Stepan Vecera 2021-5-5

编辑：Stepan Vecera 2021-5-5

ive done it completely differ way, i calculated how many bombs are around it with two for loops right after i placed the bombs and placed the number in button.Tag, and then when the button is pressed i simply rewrite it from Tag to button.String. its not very pretty, but it gets the job done