> A while ago I asked the list if it was possible to write a letter in the
Graffiti
> area and have that select the first item starting with that letter in a sorted
> Popup list. With a great deal of help from people on ths list, here's one way
to
> do it. It's rude crude and unedited but it seems to be working so far in
> CityTime 2.1, even though it could use a bit of fixing.
>
>
Hmm. I still think it'd be much easier to just do:
listP->attr.search = true;
select = LstPopupList (listP);
and then let LstPopupList handle the (admittedly undocumented)
letter-writing/selecting for you.
Neil
> In Global Defines...
>
> typedef void EvtGetEventFuncType (EventPtr event, SDWord timeout);
>
> typedef EvtGetEventFuncType * EvtGetEventFuncPtr;
>
>
>
> In Globals...
>
> static EvtGetEventFuncPtr OldTrap;
> static ListPtr globListP;
>
>
>
> The custom EvtGet Event function that is called from a trap to EvtGetEvent...
>
> /***********************************************************************
> *
> * FUNCTION: myEvtGetEvent
> *
> * DESCRIPTION: Additional hooks in EvtGetEvent
> *
> * PARAMETERS: Same as EvtGetEvent - event, timeout
> *
> * RETURNED: Sames as EvtGetEvent - nothing
> *
> ***********************************************************************/
> static void myEvtGetEvent (EventPtr event, SDWord timeout)
> {
> CharPtr keyS;
> int i;
>
>
> // first run the normal EvtGetEvent routine
> OldTrap (event, timeout);
>
> // intercept it only if appropritate
> if (event->eType == keyDownEvent && event->data.keyDown.chr > 64 &&
> event->data.keyDown.chr < 123)
> {
> // setup key string - need a string for FindCityByLetter
> keyS = MemPtrNew (2);
> ErrFatalDisplayIf (!keyS, "error allocating memory");
>
> keyS[0] = event->data.keyDown.chr;
> keyS[1] = '\0';
>
> // get the character
> i = FindCityByLetter (keyS);
>
> // handle it if approriate
> if (i != -1)
> {
> LstSetTopItem (globListP, i);
> LstDrawList (globListP);
> }
>
>
> // free memory
> MemPtrFree (keyS);
> }
>
> }
>
>
>
> Trap Setting (and unsetting) that is called either side of LstPopupList...
>
> OldTrap = SysGetTrapAddress(sysTrapEvtGetEvent);
> SysSetTrapAddress (sysTrapEvtGetEvent, &myEvtGetEvent);
>
> globListP = listP;
>
> // pop up the list
> select = LstPopupList (listP);
>
> // after selection
> SysSetTrapAddress(sysTrapEvtGetEvent,OldTrap);
>
>
>
>
> Hope this helps someone.
>
> -Darren
> http://www.codecity.com.au
>
>
>
