#2842 NORM Trial-3: Need API for specifying custom icon states

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#2842: Need API for specifying custom icon states
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  Reporter:  Eben         |       Owner:  dcbw   
      Type:  enhancement  |      Status:  new    
  Priority:  normal       |   Milestone:  Trial-3
 Component:  sugar        |     Version:         
Resolution:               |    Keywords:         
  Verified:  0            |  
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Changes (by Eben):

 * cc: benzea (added)

Comment:

 Replying to [comment:1 marco]:
 >  * Try to fetch the pressed and insensitive icons from the icon theme
 (whatever mechanism we use to expose it in the icon theme).
 This makes sense.  I think we agreed to append -pressed and -insensitive
 to the standard naming scheme...
 >  * If that fails it should use the normal icon for the pressed state.
 For the insensitive state, it should try to replace the stroke/fill
 entities with insensitive colors (Eben can you remind me which  colors we
 should use?)
 '''Pressed:''' We want to use the normal icon, and have the gray rounded
 rect appear behind it on-press/when-selected anytime the pressed state is
 not overridden.  When is ''is'' overridden, we want to use the specified
 icon and ''not'' use the rounded gray rect at all.

 '''Insensetive:''' We want to employ some automatic "graying-out"  of the
 basic icon when no icon is specified for the insensitive state.  The rule
 that's easy to apply is to use the alpha channel for the default icon and
 place it on a solid button-gray fill, so the entire icon is one color --
 middle gray.  That's the simplest, though it may be better to actually do
 a strong reduction of contrast and then shift the values so that it's
 centered on middle-gray, but not entirely one color.  (I discussed these
 options with benzea) Anyway, we want to use this automatic approach only
 when a custom icon isn't specified; otherwise we just use the custom
 insensitive icon itself.

 This might have been just what you meant Marco, but I wanted to highlight
 the fact that the "default" behaviors for both states should only occur
 when not overridden.

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Ticket URL: <http://dev.laptop.org/ticket/2842#comment:2>
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