Hmm...hope this helps (although I'm sure SOMEONE will have a better idea):
void MakeArrayList (Char * ListArrayP, UInt16 ItemCount, MemHandle * StringArrayH)
{
Char **StringArrayP;
UInt16 i, offset;
*StringArrayH = MemHandleNew (ItemCount * sizeof (Char *));
StringArrayP = MemHandleLock (*StringArrayH);
offset = 0;
for (i = 0; i < ItemCount; i++)
{
StringArrayP[i] = &ListArrayP[offset];
while (ListArrayP[offset] != 0)
offset++;
offset++;
}
MemHandleUnlock (*StringArrayH);
}
void GetStringList (MemHandle *ArrayH, UInt16 * ItemCount, UInt16 category)
{
RecordType Record;
MemHandle DmRecordH;
UInt16 TransIndex;
UInt16 Offset;
Char *ArrayP;
Char *TheString;
UInt16 totalSize;
UInt16 copysize;
totalSize=50;
*ArrayH = MemHandleNew(totalSize); // 50 is arbitrary, just make some space,
we'll shrink later
ArrayP = MemHandleLock(*ArrayH);
*ItemCount=0;
Index = 0;
DmRecordH = DmQueryNextInCategory (DB, &Index, category);
while (DmRecordH != NULL)
{
GetRecord (DmRecordH, &Record);
switch (category)
{
case cat1:
TheString = Record.Field1;
break;
case cat2:
TheString = Record.Field2;
break;
case cat3:
TheString = Record.Field3;
}
copysize = StrLen (TheString) + 1;
if (Offset + copysize > totalSize)
{
totalSize = Offset + copysize + 50; // 50 is arbitrary here.
Just keeps from resizing the block EVERY time.
MemHandleUnlock (*ArrayH);
MemHandleResize (*ArrayH, totalSize);
TransArrayP = MemHandleLock (*ArrayH);
}
StrCopy (&ArrayP[Offset], TheString);
Offset += copysize;
(*ItemCount)++;
Index++;
DmRecordH = DmQueryNextInCategory (DB, &Index, category);
}
MemHandleUnlock (*ArrayH);
MemHandleResize (*ArrayH,Offset); // Shrink the block back down...just to be
nice
}
SOME FORM FUNCTION:
switch (event->eType)
{
case frmOpenEvent:
// Get the list. Make an array of pointers and put it in StringArrayH
GetStringList (&ListArrayH, &ItemCount, category);
ListArrayP = MemHandleLock (ArrayH);
MakeArrayList (ListArrayP, ItemCount, &StringArrayH);
StringArrayP = MemHandleLock (StringArrayH);
FontID = FntGetFont ();
showCount = (ItemCount > 10) ? 10 : ItemCount;
listHeight = showCount * FntCharHeight ();
topPosition = 24;
LstNewList ((void *) &form, tempObject, 40,
topPosition, 75, listHeight, FontID, showCount,
popListPick);
LocationList = InvGetFrmObjectPtr (form, tempObject); // tempObject
is 9999 in my header file.
LstSetListChoices (TheList, StringArrayP, ItemCount);
// This routine I wrote "FindListItem" returns the item index in the
list of the one I want to highlight
// from a global variable
ItemCount = FindListItem (TheList, MyPreferences.CurrentListItem);
PopUp = InvGetFrmObjectPtr (form, popListPick);
LstSetSelection (TheList, ItemCount);
// Set the text of the list control
CtlSetLabel (PopUp, MyPreferences.CurrentListItem);
FrmDrawForm (form);
handled = 1;
break;
Steve Mann wrote:
>> Could anyone tell me where I could find an example of how to create
>> this list at runtime, or provide me with some hints.
>
>
> You can use a list drawback function, sidestepping the whole issue of
> constructing the list. All you need to do is initialize it: # items,
> selection, etc.
>
> Regards,
> Steve Mann
>
--
For information on using the Palm Developer Forums, or to unsubscribe, please see
http://www.palmos.com/dev/tech/support/forums/
