Pan mode control via keyboard

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SSOI SS 2012-2-28

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https://ww2.mathworks.cn/matlabcentral/answers/30563-pan-mode-control-via-keyboard

Hi! I have a problem. If I set command "pan" in the KeypressFcn of a GUI, so that I can use a key to control the pan mode (e.g. "P"). If the pan mode is not on, there is no problem to activate the pan mode. But if I press the key again, then the KeypressFcn will no more be invoked.

If there anyway to let the key alway control Pan on and Pan off?

Thanks

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Answer 1

Walter Roberson 2012-2-28

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Yes, there is, by infiltrating the listener.

See http://www.mathworks.com/matlabcentral/answers/2005-windowkeypressfcn-and-datacursormode-on

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SSOI SS 2012-2-28

Hi Walter, thanks, turning off the WindowListenerHandles is definitive not the solution for me. I attachted an example to show the problem:

function exampleGUI

hF = figure;

set(hF, 'WindowKeyPressFcn', @figKeyPressCallback);

function figKeyPressCallback(fHandle, EventData)

% add some keyshortcuts to SignalViewer

Key = get(fHandle, 'CurrentCharacter');

switch Key

case 'p'

pan;

end

figure(hF);

end

There is no way to let the p key always control the pan function ....

Walter Roberson 2012-2-28

You turn on pan, you use the Jedi Mind Trick on the listeners, you install a new key press callback. The new key press callback handles everything the regular callback would but also looks for 'p' and if it finds it then then it removes the trick callback and wakes up the listeners and turns pan off.

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