Re: richedit20: Implement EM_FORMATRANGE

[Phil Krylov]

On Tue, 4 Apr 2006 11:46:18 +1000
Troy Rollo <wine(a)troy.rollo.name> wrote:
> + * *** Notes on tables ***
> + *
> + * The CHARRANGE structure passed in the FORMATRANGE structure is not
> + * sufficient to deal with tables, where we would need information on the
> + * start position for text in each column of the table.
> + *
> + * Testing on Windows NT shows that the Microsoft Rich Edit control gives
> + * pathological results when there are tables in the document - both in edit
> + * mode and for EM_FORMATRANGE. The Microsoft Rich Edit control uses the
> + * table solely as a hint to where the paragraph should start. The table
> + * does not expand to fit its text. Long paragraphs wrap when you hit the
> + * right page margin and continue at the left page margin.

This is only true for RichEdit 2.0 - later versions have better table support,
while our current implementation is approximately at 2.0 level.

-- Ph.

richedit20: Implement EM_FORMATRANGE

[Troy Rollo]

On Wednesday 05 April 2006 00:46, Phil Krylov wrote:
> This is only true for RichEdit 2.0 - later versions have better table
> support, while our current implementation is approximately at 2.0 level.

Perhaps, but the problem of CHARRANGE being insufficient to describe the start 
and end of rendering for a table remains.

On Wednesday 05 April 2006 00:16, Dan Kegel wrote:
> Hi Troy,
> any chance you can also provide a conformance test,
> however trivial?

Not a meaningful one - too many things depend on environment 
(LOGPIXELSX/LOGPIXELSY, font availability, font rendering differences due to 
different font engines, versions of font engines, configuration of font 
engines).
> I gather that some but not all apps will also require EM_DISPLAYBAND
> to make use of this, right?  Just curious.)

Some will, maybe, but with this change some of those apps will be improved in 
because they will not get stuck in a loop. EM_DISPLAYBAND is somewhat 
anachronistic though and apps get no significant benefit from using it over 
rendering with EM_FORMATRANGE. In theory EM_DISPLAYBAND may improve 
efficiency of printing to some types of printers, in practice the difference 
is not worth worrying about.

-- 
Troy Rollo - wine(a)troy.rollo.name