How to update editbox uicontrol string during keypressfcn?

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

Answer 1

[Grzegorz Knor]

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

[Eero Kuusi]

Thank you, this workaround worked perfectly!

Answer 2

[ALLAEDINE AH]

Hi guys! What if i wanted to enter only numbers, ie: 39 OR 1.2 ?

Answer 3

[Mitchell]

This is straightforward, on the callback of the edit control do:

number = str2double(get(@myControl,'String'));

if(isnan(number))

    set(@myControl,'String',defaultValue);

end

Also, if the str2double command was successful you could update defaultValue to number so that every time a non-numeric is entered the value will be replaced by the last numeric value.