Review Request: Plasma::IconWidget: Add support for constrained size hints

[Ingomar Wesp]

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http://svn.reviewboard.kde.org/r/5580/
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Review request for Plasma.


Summary
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I poked around the IconWidget class and came up with the following patch that
implements handling of constraints in sizeHint(...). It basically pulls the 
code that determines the icon size for a given widget size out of 
layoutIcons(...) into an the a new iconSizeForWidgetSize(...) method so that 
it can be reused by sizeHint(...).

I've also changed the signatures of elidedText(...) and layoutText(...) by 
removing the need to pass a QStyleOptionGraphicsItem*, since it wasn't used 
there anyway. If there's some reason why this could be a bad idea, I'll put it 
back in.

The patch changes the behavior of sizeHint(...) in the following way:

- If there is no constraint, the behavior remains unchanged.

- Likweise, the minimum and maximum sizes are unaffected by constraints. I 
  don't see how limiting the available width/height would affect either one?
  
- The preferred size computation now uses the constraint to compute the 
  expected size of the icon and adjusts the returned value accordingly.

I must admit that I'm not entirely happy with the solution as it has (at
least ;) the following issues:

- The reported preferredSize is not bounded by the maximumSize. Unfortunately 
  I can't call maximumSize() and its derivatives from within sizeHint, since
  this might cause QGraphicsLayoutItem to update all sizeHints, which might in
  turn lead to unbound recursion, since it apparently also caches the 
  previously passed constraints :/
  
  This is why I'm setting any unconstrained dimension to QWIDGETSIZE_MAX for 
  the purpose of determining the icon size that fits within. 

- I'm not very fond of having to initialize and pass around
  QStyleOptionGraphicsItem objects, especially since they are apparently only 
  used for determining whether we've got an RTL layout. 

Any testing / feedback would be greatly appreciated.


Diffs
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  /trunk/KDE/kdelibs/plasma/widgets/iconwidget.cpp 1182894 
  /trunk/KDE/kdelibs/plasma/widgets/iconwidget_p.h 1182894 

Diff: http://svn.reviewboard.kde.org/r/5580/diff


Testing
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Thanks,

Ingomar

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