MATLAB: How to update editbox uicontrol string during keypressfcn

uicontrol editbox keypressfcn string

Hi,

I have an editbox uicontrol that has a KeyPressFunction that would need to read what has been typed into the uicontrol. How can I make the KeyPressFunction to read the typed text? If I use

get(gcbo,'String')

it returns the string from before pressing any keys / since the last Callback event (in other words whatever the string was after I last pressed enter or clicked away from the editbox).

I want for the editbox to read the string when I press the downarrow key and act according to what has been written.

Thanks in advance, EK

Best Answer

Try this code as a workaround:

function test
close all
uicontrol('Style','Edit','String','matlab','KeyPressFcn',@clbck)
function clbck(src,evnt)
if isequal(evnt.Key,'downarrow')
    import java.awt.Robot;
    import java.awt.event.KeyEvent;
    robot=Robot;
    robot.keyPress(KeyEvent.VK_ENTER);
    pause(0.01)
    robot.keyRelease(KeyEvent.VK_ENTER);
    disp(get(src,'String'));
end

Related Solutions

MATLAB: Using WindowKeyPressFcn with uicontrol

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!

MATLAB: How to Simulate keyboard key inputs

Java Robot class.

Best Answer

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MATLAB: Using WindowKeyPressFcn with uicontrol

MATLAB: How to Simulate keyboard key inputs

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