OpenEuphoria

RE: win32lib listview suggestions

• Posted by Derek Parnell <Derek.Parnell at SYD.RABOBANK.COM> Jul 21, 2002
• 374 views

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> -----Original Message-----
> From: 10963508 at europeonline.com [mailto:10963508 at europeonline.com]
> Subject: Re: win32lib listview suggestions
> 
> 
> 
> ----- Original Message -----
> From: "Derek Parnell" <ddparnell at bigpond.com>
> 
> > > - Natural sort, 1,3,20 and not 1,20,3
> >
> > This is already catered for. You can tell win32lib, which 
> columns contain
> > numbers and thus it sorts the column correctly.
> 
> I use it now, but it's slow beyond being usable.
> I know this discussion went on before but what do I need to 
> do to speed it
> up?
> I have about 60 items in listview and it takes about 3 
> seconds to sort those
> numbers. This needs to be fixed in Win32Lib in my opinion, it 
> should be fast
> by default.

The ListView control stores data as text, not as numbers. So, if you want to
do numeric comparisions, then you must either convert them to back to
numbers first, or compare a shadow copy of the listview column data, stored
as numbers, that you are managing yourself.

Another approach is to add the numeric items as RIGHT-ALIGNED text with
leading spaces. Then a simple text comparision will be sufficient. Also, if
you replace the generic comparision routine with your own, you may find some
improvement too. For example...

  procedure mysort(integer id, atom a, atom b, integer col)
	return compare(getLVItemText(id, a, col), getLVItemText(id, b, col))
  end procedure
  x = routine_id("mysort")
  ov = setLVAttr( LV, {{kLVSortRtn, {x,x,x}}})
  -- Add items...
  AddItem(LV, 0, {"Derek Parnell", sprintf("%4d", age), sprintf("%3.2f,
weight)})


> One more problem:
> after I inserted items into listview they are not sorted. 
> What function do I
> need to call to sort items of specified column, not first but 
> some other
> column?
> like in windows file explorer, you click on column header and 
> then that
> column is sorted that way when you click on different folders.

I don't have access to the API documentation just now, so I can't check this
out. I don't remember anything though. I supose you could simulate a mouse
button click on the column header. Or maybe you have to load the LV in the
initial order first.

-----------
Derek.

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