RE: [Tile-dev] Stippling images in disabled buttons

[Jeff H. <je...@Ac...>]

Joe English wrote:
> Tile widgets with an -image (buttons, labels, etc.) currently 
> draw the image stippled when they are in the disabled state, 
> like the core widgets do.
> 
> Would anyone complain if this feature went away?  

Went away in favor of not doing anything for disabled state?
No, that wouldn't be nice, but ...

> This behavior is disabled on OSX to work around an AquaTk bug 
> (#1100117); according to a recent post on comp.lang.tcl [*] 
> it doesn't work all 
> that well under X11 either (specifically, when the image has an 
> alpha channel); and even when it does work it doesn't look 
> very good (common practice nowadays is to use a desaturated, 
> darkened, or grayscale image instead of stippling).

Under X11 the stippling looks fine to me, but not on OS X
or Windows.  I actually had code that desaturated the image
by default on Windows.  It may even be x-platform code
(operating on the image).  I think the reason I didn't
commit it is that it operated on the fly (desaturating the
image at each request for repaint).

> Note that the Tile widgets allow the program to specify 
> state-dependent auxilliary images, so this effect is still 
> possible; it just takes some extra work on the programmer's 
> part.  We could provide a utility routine to automatically 
> generate "grayed-out" versions of icon images to ease the pain.

State based is best, but what about the default action
again?

Jeff