| Widget event handlers [message #23988] |
Thu, 01 March 2001 16:58 |
Joe Means
Messages: 44
Registered: November 1996
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In a widget program [TranslateAxies] I am writing I specify an event
handler function for each widget that can generate an event. I specify
event handlers for each text and button widget but not for base and
label widgets [no bases are resizeable]. No base widgets can be
resized. The GUI includes text boxes for user input. When I ran the
program initially, put text in any box and clicked enter, I always got
the error:
Attempt to call undefined procedure/function: 'TRANSLATEAXIES_EVENT'.
So I put a do-nothing procedure with this name in the
TranslateAxies_EventCB file. Now I do not get the error. Also, all the
text widgets and their event functions seem to run fine [when I click
return after entering a value in the text field], because their values
in the info structure are updated OK.
It does not seem like I need this do-nothing proceedure. Can anyone
tell me why it is needed?
Also, when I type text in a text widget it will not call the event
function to update the value in the info structure if I click tab to
move out of the field. Why is this?
--
Joseph E. Means
Assistant Professor, joe.means@orst.edu
Department of Forest Science
Oregon State University
Corvallis, OR 97331-5752
541-750-7351
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