Using WindowKeyPressFcn with uicontrol

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Ara 2014-8-16

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https://ww2.mathworks.cn/matlabcentral/answers/151060-using-windowkeypressfcn-with-uicontrol

评论： Le Dung 2019-1-18

采纳的回答： Geoff Hayes

From my code

snap = uicontrol(f,'Style','pushbutton','String','Recognize',... 'units','characters',... 'Position',[5 1.5 30 5],'Callback',{@snapshot_callback});

How to push button by using key press from keyboard and if I want to push button by spacebar how to specify it?

Thank you so much :)

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Geoff Hayes 2014-8-16

Ara - what is it exactly that you want to happen? Do you want a pressed key on the keyboard to simulate the pressing of a button on the GUI?

Ara 2014-8-17

Yes

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采纳的回答

Geoff Hayes 2014-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/151060-using-windowkeypressfcn-with-uicontrol#answer_148901

在 MATLAB Online 中打开

Ara - if you want the pressing of the spacebar to simulate the pressing of the snap button, you can do the following: in your code that generates the GUI, assign a callback to the figure for the WindowKeyPressFcn as

set(f,'WindowKeyPressFcn',@keyPressCallback);

where f is your figure. The keyPressCallback will be called whenever the figure/GUI has focus and a key on the keyboard is pressed. Now define the callback (within the same file) as

 function keyPressCallback(source,eventdata)
      % determine the key that was pressed
      keyPressed = eventdata.Key;
      if strcmpi(keyPressed,'space')
          % the key that was pressed was the space bar so set focus to 
          % the snap button
          uicontrol(snap);
          % invoke the callback for the snap button
          snapshot_callback(snap,[]);
      end
  end

In the above, we use uicontrol to set focus to the snap button, and then we call its callback. I had to do this in my environment, so make sure that it is necessary for you to do the same. (Using uincontrol didn't automatically call the callback for the button.)

Try the above and see what happens!

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Walter Roberson 2019-1-17

you already have an open question on this where people have been giving you code.

Le Dung 2019-1-18

Yes. Thank you so much.

I know. but i don't know how to use KeyPressFcn for my problem

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