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darcs-hash:20070512215301-72aca-59213ac37c38e57d6ffed1d518afd4729f1744c9
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darcs-hash:20070514044547-a5988-0e3c07a629fd1a28e11ee9ae1395086a5477dae2
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darcs-hash:20070504094143-9c5c1-44d5edcd4b261a2d93b054f48e7818b0c9e58db2
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Using Typeables as the only constraint on layout messages is a bit
scary, as a user can send arbitrary values to layoutMsg, whether they
make sense or not: there's basically no type feedback on the values you
supply to layoutMsg.
Folloing Simon Marlow's dynamically extensible exceptions paper, we use
an existential type, and a Message type class, to constrain valid
arguments to layoutMsg to be valid members of Message.
That is, a user writes some data type for messages their layout
algorithm accepts:
data MyLayoutEvent = Zoom
| Explode
| Flaming3DGlassEffect
deriving (Typeable)
and they then add this to the set of valid message types:
instance Message MyLayoutEvent
Done. We also reimplement the dynamic type check while we're here, to
just directly use 'cast', rather than expose a raw fromDynamic/toDyn.
With this, I'm much happier about out dynamically extensible layout
event subsystem.
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darcs-hash:20070430162647-a5988-70420c2db283eb1585c96d977e5ac5ca3d0d1532
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darcs-hash:20070430161635-a5988-ee0abcdeff2aa92df2d593de488797015c0fc7e7
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darcs-hash:20070430161511-a5988-2196c16d0c2d0d5207b68a6b27d66b11b4fe0014
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darcs-hash:20070430054715-a5988-a74f5e2868f47443a69b0cd821fa690e43a4a7e1
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This also fixes a bug where xmonad was assuming a 24-bit display, and just
using, eg, 0xff0000 as an index into a colormap without querying the X server
to determine the proper pixel value for "red".
darcs-hash:20070430043859-b9aa7-9467ff583ec95144e5baa088e4b1536a725e7bc6
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darcs-hash:20070419040833-9c5c1-9d8965bf22113a8aec47244eab7c769affb75951
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darcs-hash:20070419015430-a5988-1abfb64ca77e80031074f4a01f1f4e1a2e5efbac
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darcs-hash:20070419012705-9c5c1-3aa97e02123af08c3f4500c9e9c3bb7ab4121652
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focus, master, and cycling direction between the modes
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