KeyPressFcn problem

Question

Razvan 2011-5-21

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/7926-keypressfcn-problem

回答： Norbert 2020-10-15

Hi everyone,

I have a problem regarding the KeyPressFcn of a figure. I try to make a GUI in which I want to control something with the keys. If the focus is on the main figure then this is possible but after I press a button and the focus moves to the button, the KeyPressFcn doesn't activate. How can I move the focus back to the main window (to the background) after I press a button, in order to be able to record again the pressed keys?

Here is a small example in which after the button is pressed the keys are not recorded until I click with the mouse somewhere on the background and the focus moves again to the main window.

function crazy_gui
f = figure('KeyPressFcn', @(handle,event) disp(event.Key), 'Position',[500,500,500,500]);
hButton = uicontrol('Style','pushbutton','String','Crazy Button',...
        'Position',[200,200,100,100],...
        'Callback',@button_Callback);
function button_Callback(handle,event)      
  disp('Focus changed to the button! Now you cannot record the pressed keys');
end
end

Thanks,

Razvan

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Answer 1

Matt Fig 2011-5-21

1
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https://ww2.mathworks.cn/matlabcentral/answers/7926-keypressfcn-problem#answer_10912

Try the WindowKeyPressFcn instead.

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Razvan 2011-5-21

Thanks a lot!

Razvan 2011-5-21

And how can I disable the WindowKeyPressFcn property while a slider is active, such that in that case the keys control only the slider and don't do anything else outside the slider?

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