Alaska Software Inc. - XbpListBox with ::drawMode := XBP_DRAW_OWNER, after ::Clear() the items height becomes lesser then original

	Author	Topic: XbpListBox with ::drawMode := XBP_DRAW_OWNER, after ::Clear() the items height becomes lesser then original
	Paulo Pinheiro	XbpListBox with ::drawMode := XBP_DRAW_OWNER, after ::Clear() the items height becomes lesser then original on Tue, 20 Nov 2012 09:49:24 +0000 Hi all, Using Alaska example in "%Alaska%\XPPW32\SOURCE\samples\basics\OWNERDRW" with a few changes: - 2 buttons - 1 more method in class XbpColorListbox to demonstrate the following: after the initial creation, if we do a ::Clear() and redraw the items, the height of the items becomes lesser than what it was at first. Does anyone know how to workaround this? TIA, Paulo Pinheiro OWNERDRW .prg COLORBOX .prg
	Andreas Gehrs-Pahl	Re: XbpListBox with ::drawMode := XBP_DRAW_OWNER, after ::Clear() the items height becomes lesser then original on Tue, 20 Nov 2012 15:03:45 -0500 Paulo, >Does anyone know how to workaround this? The problem is (partially) explained in PDR 6374 -- see here: http://www.alaska-software.com/scripts/waa001.dll?WAA_PACKAGE=PUBLICDTS&WAA_FORM=DISPLAYPDR&PDRID=6374 In the sample program, the MeasureItem code is called only once -- for the very first Item -- and the Item Size is calculated based on the used Font. Later, the MeasureItem Method isn't called anymore, and the default Height is used instead. In Xbase++ 2.0, those issues are fixed (for both Owner Draw methods). A workaround (for the example code) would be to simply add "::Configure()" in your "::ReDraw()" Method, before the For/Next loop. Alternatively, you could use the workaround from the PDR, overloading the "::AddItem()" method. Hope that helps. Andreas Andreas Gehrs-Pahl Absolute Software, LLC phone: (989) 723-9927 email: Andreas.GP@Charter.net Andreas.Gehrs-Pahl@InterAct911.com Andreas.Gehrs-Pahl@EJusticeSolutions.com Andreas@DDPSoftware.com web: http://www.Aerospace-History.net

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Topic: XbpListBox with ::drawMode := XBP_DRAW_OWNER, after ::Clear() the items height becomes lesser then original

XbpListBox with ::drawMode := XBP_DRAW_OWNER, after ::Clear() the items height becomes lesser then original
on Tue, 20 Nov 2012 09:49:24 +0000

Hi all,

Using Alaska example in "%Alaska%\XPPW32\SOURCE\samples\basics\OWNERDRW"
with a few changes:
- 2 buttons
- 1 more method in class XbpColorListbox

to demonstrate the following: after the initial creation, if we do a
::Clear() and redraw the items, the height of the items becomes lesser than
what it was at first.

Does anyone know how to workaround this?

TIA,
Paulo Pinheiro

OWNERDRW .prg

COLORBOX .prg

Andreas Gehrs-Pahl

Re: XbpListBox with ::drawMode := XBP_DRAW_OWNER, after ::Clear() the items height becomes lesser then original
on Tue, 20 Nov 2012 15:03:45 -0500

Paulo,

>Does anyone know how to workaround this?

The problem is (partially) explained in PDR 6374 -- see here:
http://www.alaska-software.com/scripts/waa001.dll?WAA_PACKAGE=PUBLICDTS&WAA_FORM=DISPLAYPDR&PDRID=6374

In the sample program, the MeasureItem code is called only once -- for the
very first Item -- and the Item Size is calculated based on the used Font. 
Later, the MeasureItem Method isn't called anymore, and the default Height 
is used instead.

In Xbase++ 2.0, those issues are fixed (for both Owner Draw methods).

A workaround (for the example code) would be to simply add "::Configure()" 
in your "::ReDraw()" Method, before the For/Next loop. Alternatively, you 
could use the workaround from the PDR, overloading the "::AddItem()" method.

Hope that helps.

Andreas

Andreas Gehrs-Pahl
Absolute Software, LLC

phone: (989) 723-9927
email: Andreas.GP@Charter.net
       Andreas.Gehrs-Pahl@InterAct911.com
       Andreas.Gehrs-Pahl@EJusticeSolutions.com
       Andreas@DDPSoftware.com
web:   http://www.Aerospace-History.net