MATLAB: Pan cancels WindowKeyPressFcn callback…

panwindowkeypressfcn

Hi,

I noticed that after using the pan function, WindowKeyPressFcn callback doesn't work anymore…

Example:

function someFunction
  Fig = figure('WindowKeyPressFcn', @buttonPressed_Callback);
  plot(rand(1,10))
  pan on
    function buttonPressed_Callback(handle, event)
      key = event.Key
    end
end

How can I reactivate the WindowKeyPressFcn callback after the pan command?

Thanks,

Razvan

Best Answer

You are correct, pan does have that effect. Please see http://www.mathworks.com/matlabcentral/answers/30563-pan-mode-control-via-keyboard

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MATLAB: Key press in GUI

You can catch such keys in the WindowKeypressFcn. This will help you to identify the names of the pressed keys:

FigH = figure
set(FigH, 'WindowKeyPressFcn', @KeyPress)
function KeyPress(Source, EventData)
disp(EventData)

Another idea is to use the (still undocumented?) "CurrentKey" and "CurrentModifier" properties of the FIGURE.

MATLAB: Default behaviour of key press callback for matlab figure

Matlab can't know which keys your callback care or doesn't care about, so your callback receives all the key presses and indeed the command window is no longer brought to the foreground.

In my opinion, it's not a good idea to rely on this behaviour. I wasn't even aware of it and personnally, I'd be annoyed if a GUI brought back a command window that I'd minimised.

Noneless, you can set the focus back to the command window within your callback by calling commandwindow:

function yourkeypresscallback(source, eventargs)
    %some event handling code eg
    if eventargs.Key == 'q' && isempty(eventargs.Modifier)
        %do something
    end
    %now bring focus to command window
    commandwindow;    
end

Best Answer

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MATLAB: Key press in GUI

MATLAB: Default behaviour of key press callback for matlab figure

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