[wxhaskell-users] Problems handling events

[<a_r...@ya...>]

Hi,

Is there another function apart form propagateEvent to send events to the "standard" event
handler?

For example in these situations:

1) I have some TexEntry widgets on a frame. If the user press Tab, focus moves to next TexEntry.
Now, I want to handle that event this way: if user press Tab, the program does something (for
example, check if the text entered is a number) and then pass the event to the "standard" handler
to move the focus to the next widget. I could change the focus by hand, but this is cumbersome, I
don't want to manage a list of widgets, use a Var to store where focus is, etc., this is
wxhaskell's job.

2) I need to autocomplete text on a TextEntry. So, if I use "on keyboard" to detect when user
types next letter, and thus I can do something with that letter, the "standard" event handler
doesn't see the event, and thus the letter is not printed on the TextEntry. I have to do something
like "set text :~ (++ <letter>)". The problem is that these events only detect keypresses, not
text. If user press "A" I only see a "shift key press" followed by "a key press". I have to
translate key press sequences to text, which is a pain for languages with accented characters, and
impossible if user press Ctrl-v and pastes some text. If I could do something like:

on keyboard ::= \w -> standardHandler >> get w text >>= myFunction

this problem dissapears.

Is there a way to do this, or something with the same result?

Antonio Regidor Garcia




       
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