Re: [Plib-devel] [RFC] changing slider behavior

[Melchior F. <mf...@us...>]

OK, so I've implemented both old and new ("modern") behavior.
Actually, the former can be useful in some cases, where quick
selection of an estimated value is desirable without having
to grab a small slider handle. The old behavior is even default
now.

As the new behavior makes the slider position jump in fixed
intervals, for which a new parameter was required, this parameter
also decides whether old or new behavior should be used. In
the Qt-Toolkit these big steps are called PageStep (while the
small steps are called LineStep). I've used the same name:

  setPageStepSize(0);    ... no step chosen -> use default
                             (this is consistent with the already
                             existing puRange::setStepSize(),
                             where 0 also means to use a default)

  setPageStepSize(4);    ... increase/decrease value by 4 if one
                             clicks on the slider background rather
                             than the slider handle

  setPageStepSize(-1);   ... page steps disabled -> old behavior
                             (this is default)


The patch also fixes arrow highlighting in puaScrollBar. Somebody
had started to implement that, but stopped half-way. This wasn't
functional. Additionally, it reduced the slider minimum-width
from 10px to 8px. (I had introduced the 10px a few years ago,
but a bit smaller can't hurt.)


Files on my homepage. I hope this helps to apply the changes,
saving you from applying diffs manually.  :-)

./src/pui/
  http://members.aon.at/mfranz/plib/pu.h  [45.2 kB]  
  http://members.aon.at/mfranz/plib/puSlider.cxx  [6.1 kB]

./src/puAux/
  http://members.aon.at/mfranz/plib/puAuxScrollBar.cxx  [9.3 kB]

I'll submit the necessary changes do the HTML documentation in
another patch.

m.