Sample script for KeyPressFcn use in GUI

[Don Tucker]

I'm trying to have a function called when a user presses the F1 key
(or 'h') when the cursor is over the form. Could someone provide me
with a very simple example script (e.g., a function calls a
disp('Hello'); or something when the user presses the 'h' key on an
empty form)? In addition to the script, what do I place in the
KeyPressFcn entry on the property inspector for the form?

Thanks in advance,
Don

[Ramesh Chandra]

Hi Don,

    You could include the following sequence in your keypressfcn ....

if get(handles.figure1,'currentcharacter') == 'h'

   %execute these instructions

end

Note that your keypressfcn executes only when the focus is on your
figure. I donot know how to detect an 'F1 key' press.

hope that helps,
Ramesh

[Don Tucker]

Yes, but what do I put in the property inspector slot next to
KeyPressFcn?

I tried putting 'hey' in the slot, and then in the .m file for the
figure defining:

function varargout = hey
if get(handles,'CurrentCharacter') == 'h'
disp('Hey.')
end

But when I actually attempt to execute the key press, I get an error
that 'hey' is an unrecognized function. How do I actually associate a
function call for this event?

Don

"Ramesh Chandra" <itsr...@hotmail.com> wrote in message news:<eeae...@WebX.raydaftYaTP>...

[Steven Lord]

"Don Tucker" <rekcu...@yahoo.com> wrote in message
news:52d70c1.02060...@posting.google.com...

> Yes, but what do I put in the property inspector slot next to
> KeyPressFcn?

I would put the string <automatic> in there. When you save the GUI, the
"<automatic>" will be replaced by the syntax necessary to call to a
subfunction of the main GUI and the main GUI m-file will be updated to
include that subfunction. After that, add your KeyPressFcn to that
subfunction.

> I tried putting 'hey' in the slot, and then in the .m file for the
> figure defining:
>
> function varargout = hey
> if get(handles,'CurrentCharacter') == 'h'
> disp('Hey.')
> end
>
> But when I actually attempt to execute the key press, I get an error
> that 'hey' is an unrecognized function.

Function scope will get you every time.

> How do I actually associate a function call for this event?

See above.

--
Steve Lord
sl...@mathworks.com

[Ramesh Chandra]

Hello Don,
   
    Right-click on the figure in GUIDE and click "view callbacks".
from there select keypressfcn ... it will be automatically generated
for you in the m file. Include the code in that function.
 
     You can also define your own keypressfcn. The mistake u are
making is that u are not passing the handles structure to your "hey"
function. So using
function varargout = hey (handles) should do the job for you.