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This is a first attempting at a floating layer:
mod-button1: move window
mod-button2: swapMaster
mod-button3: resize window
mod-t: make floating window tiled again
Moving or resizing a window automatically makes it floating.
Known issues:
Hard to manage stacking order. You can promote a window to move it to the top,
(which you can do with mod-button2) but it should be easier than that.
Moving a window by dragging it to a different Xinerama screen does not move it
to that workspace.
Code is ugly.
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By default, it is 0 (set in Config.hs), but set this to a pixel count to
get a permanent gap at the top of the screen. You can then at startup
launch dzen, and it will run in this gap, and not be obscured by other
windows.
Perfect for a persistant status bar.
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In order to give a better account of how focus and master interact, and
how each operation affects focus, we reimplement the StackSet type as a
two level nested 'Zipper'. To quote Oleg:
A Zipper is essentially an `updateable' and yet pure functional
cursor into a data structure. Zipper is also a delimited
continuation reified as a data structure.
That is, we use the Zipper as a cursor which encodes the window which is
in focus. Thus our data structure tracks focus correctly by
construction! We then get simple, obvious semantics for e.g. insert, in
terms of how it affects focus/master. Our transient-messes-with-focus
bug evaporates. 'swap' becomes trivial.
By moving focus directly into the stackset, we can toss some QC
properties about focus handling: it is simply impossible now for focus
to go wrong. As a benefit, we get a dozen new QC properties for free,
governing how master and focus operate.
The encoding of focus in the data type also simplifies the focus
handling in Operations: several operations affecting focus are now
simply wrappers over StackSet.
For the full story, please read the StackSet module, and the QC
properties.
Finally, we save ~40 lines with the simplified logic in Operations.hs
For more info, see the blog post on the implementation,
http://cgi.cse.unsw.edu.au/~dons/blog/2007/05/17#xmonad_part1b_zipper
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