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<title>XMonad/Layout/LimitWindows.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleInstances, MultiParamTypeClasses, DeriveDataTypeable, PatternGuards #-}</span>
<a name="line-2"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : XMonad.Layout.LimitWindows</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) 2009 Adam Vogt</span>
<a name="line-6"></a><span class='hs-comment'>-- (c) 2009 Max Rabkin -- wrote limitSelect</span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD-style (see xmonad/LICENSE)</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : vogt.adam@gmail.com</span>
<a name="line-10"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-11"></a><span class='hs-comment'>-- Portability : unportable</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- A layout modifier that limits the number of windows that can be shown.</span>
<a name="line-14"></a><span class='hs-comment'>-- See "XMonad.Layout.Minimize" for manually setting hidden windows.</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>LimitWindows</span> <span class='hs-layout'>(</span>
<a name="line-19"></a> <span class='hs-comment'>-- * Usage</span>
<a name="line-20"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-21"></a>
<a name="line-22"></a> <span class='hs-comment'>-- * Layout Modifiers</span>
<a name="line-23"></a> <span class='hs-varid'>limitWindows</span><span class='hs-layout'>,</span><span class='hs-varid'>limitSlice</span><span class='hs-layout'>,</span><span class='hs-varid'>limitSelect</span><span class='hs-layout'>,</span>
<a name="line-24"></a>
<a name="line-25"></a> <span class='hs-comment'>-- * Change the number of windows</span>
<a name="line-26"></a> <span class='hs-varid'>increaseLimit</span><span class='hs-layout'>,</span><span class='hs-varid'>decreaseLimit</span><span class='hs-layout'>,</span><span class='hs-varid'>setLimit</span>
<a name="line-27"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>LayoutModifier</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>StackSet</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>W</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span> <span class='hs-layout'>(</span><span class='hs-conid'>IncMasterN</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'><=<</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-varid'>guard</span><span class='hs-layout'>)</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'><$></span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-35"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span><span class='hs-layout'>(</span><span class='hs-varid'>fromJust</span><span class='hs-layout'>)</span>
<a name="line-36"></a>
<a name="line-37"></a><span class='hs-comment'>-- $usage</span>
<a name="line-38"></a><span class='hs-comment'>-- To use this module, add the following import to @~\/.xmonad\/xmonad.hs@:</span>
<a name="line-39"></a><span class='hs-comment'>--</span>
<a name="line-40"></a><span class='hs-comment'>-- > import XMonad.Layout.LimitWindows</span>
<a name="line-41"></a><span class='hs-comment'>--</span>
<a name="line-42"></a><span class='hs-comment'>-- > myLayout = limitWindows 6 $ Tall 1 0.03 0.5 ||| Full ||| RandomOtherLayout...</span>
<a name="line-43"></a><span class='hs-comment'>-- > main = xmonad defaultConfig { layoutHook = myLayout }</span>
<a name="line-44"></a><span class='hs-comment'>--</span>
<a name="line-45"></a><span class='hs-comment'>-- You may also be interested in dynamically changing the number dynamically,</span>
<a name="line-46"></a><span class='hs-comment'>-- by binding keys to the 'increaseLimit', 'decreaseLimit', or 'setLimit'</span>
<a name="line-47"></a><span class='hs-comment'>-- actions.</span>
<a name="line-48"></a><span class='hs-comment'>--</span>
<a name="line-49"></a><span class='hs-comment'>-- For detailed instructions on editing your key bindings, see</span>
<a name="line-50"></a><span class='hs-comment'>-- "XMonad.Doc.Extending#Editing_key_bindings".</span>
<a name="line-51"></a><span class='hs-comment'>--</span>
<a name="line-52"></a><span class='hs-comment'>-- See also 'XMonad.Layout.BoringWindows.boringAuto' for keybindings that skip</span>
<a name="line-53"></a><span class='hs-comment'>-- the hidden windows.</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="increaseLimit"></a><span class='hs-definition'>increaseLimit</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-56"></a><span class='hs-definition'>increaseLimit</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sendMessage</span> <span class='hs-varop'>$</span> <span class='hs-conid'>LimitChange</span> <span class='hs-varid'>succ</span>
<a name="line-57"></a>
<a name="line-58"></a><a name="decreaseLimit"></a><span class='hs-definition'>decreaseLimit</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-59"></a><span class='hs-definition'>decreaseLimit</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sendMessage</span> <span class='hs-varop'>.</span> <span class='hs-conid'>LimitChange</span> <span class='hs-varop'>$</span> <span class='hs-varid'>max</span> <span class='hs-num'>1</span> <span class='hs-varop'>.</span> <span class='hs-varid'>pred</span>
<a name="line-60"></a>
<a name="line-61"></a><a name="setLimit"></a><span class='hs-definition'>setLimit</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-62"></a><span class='hs-definition'>setLimit</span> <span class='hs-varid'>tgt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sendMessage</span> <span class='hs-varop'>.</span> <span class='hs-conid'>LimitChange</span> <span class='hs-varop'>$</span> <span class='hs-varid'>const</span> <span class='hs-varid'>tgt</span>
<a name="line-63"></a>
<a name="line-64"></a><a name="limitWindows"></a><span class='hs-comment'>-- | Only display the first @n@ windows.</span>
<a name="line-65"></a><span class='hs-definition'>limitWindows</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-conid'>LimitWindows</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-66"></a><span class='hs-definition'>limitWindows</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>LimitWindows</span> <span class='hs-conid'>FirstN</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-67"></a>
<a name="line-68"></a><a name="limitSlice"></a><span class='hs-comment'>-- | Only display @n@ windows around the focused window. This makes sense with</span>
<a name="line-69"></a><span class='hs-comment'>-- layouts that arrange windows linearily, like 'XMonad.Layout.Layout.Accordion'.</span>
<a name="line-70"></a><span class='hs-definition'>limitSlice</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-conid'>LimitWindows</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-71"></a><span class='hs-definition'>limitSlice</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>LimitWindows</span> <span class='hs-conid'>Slice</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-72"></a>
<a name="line-73"></a><a name="limitSelect"></a><span class='hs-comment'>-- | Only display the first @m@ windows and @r@ others.</span>
<a name="line-74"></a><span class='hs-comment'>-- The @IncMasterN@ message will change @m@, as well as passing it onto the</span>
<a name="line-75"></a><span class='hs-comment'>-- underlying layout.</span>
<a name="line-76"></a><span class='hs-definition'>limitSelect</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-conid'>Selection</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-77"></a><span class='hs-definition'>limitSelect</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ModifiedLayout</span> <span class='hs-conid'>Sel</span><span class='hs-layout'>{</span> <span class='hs-varid'>nMaster</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-varid'>start</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-varid'>nRest</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>r</span> <span class='hs-layout'>}</span>
<a name="line-78"></a>
<a name="line-79"></a><a name="LimitWindows"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>LimitWindows</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LimitWindows</span> <span class='hs-conid'>SliceStyle</span> <span class='hs-conid'>Int</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span><span class='hs-layout'>,</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-80"></a>
<a name="line-81"></a><a name="SliceStyle"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>SliceStyle</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>FirstN</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Slice</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span><span class='hs-layout'>,</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-82"></a>
<a name="line-83"></a><a name="LimitChange"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>LimitChange</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LimitChange</span> <span class='hs-layout'>{</span> <span class='hs-varid'>unLC</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-84"></a>
<a name="line-85"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Message</span> <span class='hs-conid'>LimitChange</span>
<a name="line-86"></a>
<a name="line-87"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutModifier</span> <span class='hs-conid'>LimitWindows</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-88"></a> <span class='hs-varid'>pureMess</span> <span class='hs-layout'>(</span><span class='hs-conid'>LimitWindows</span> <span class='hs-varid'>s</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-89"></a> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-conid'>LimitWindows</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>pos</span> <span class='hs-varop'><=<</span> <span class='hs-layout'>(</span><span class='hs-varop'>`app`</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>unLC</span> <span class='hs-varop'><=<</span> <span class='hs-varid'>fromMessage</span>
<a name="line-90"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>pos</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>guard</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-varop'>>=</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span>
<a name="line-91"></a> <span class='hs-varid'>app</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>guard</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-92"></a>
<a name="line-93"></a> <span class='hs-varid'>modifyLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>LimitWindows</span> <span class='hs-varid'>style</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>ws</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span>
<a name="line-94"></a> <span class='hs-varid'>runLayout</span> <span class='hs-varid'>ws</span> <span class='hs-layout'>{</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>stack</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>n</span> <span class='hs-varop'><$></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>stack</span> <span class='hs-varid'>ws</span> <span class='hs-layout'>}</span> <span class='hs-varid'>r</span>
<a name="line-95"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>style</span> <span class='hs-keyword'>of</span>
<a name="line-96"></a> <span class='hs-conid'>FirstN</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>firstN</span>
<a name="line-97"></a> <span class='hs-conid'>Slice</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>slice</span>
<a name="line-98"></a>
<a name="line-99"></a><a name="firstN"></a><span class='hs-definition'>firstN</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>a</span>
<a name="line-100"></a><span class='hs-definition'>firstN</span> <span class='hs-varid'>n</span> <span class='hs-varid'>st</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>upfocus</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromJust</span> <span class='hs-varop'>$</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>differentiate</span> <span class='hs-varop'>$</span> <span class='hs-varid'>take</span> <span class='hs-layout'>(</span><span class='hs-varid'>max</span> <span class='hs-num'>1</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>integrate</span> <span class='hs-varid'>st</span>
<a name="line-101"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>upfocus</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varop'>.</span><span class='hs-layout'>)</span> <span class='hs-varid'>id</span> <span class='hs-varop'>$</span> <span class='hs-varid'>replicate</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-layout'>(</span><span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>up</span> <span class='hs-varid'>st</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>focusDown'</span>
<a name="line-102"></a>
<a name="line-103"></a><a name="slice"></a><span class='hs-comment'>-- | A non-wrapping, fixed-size slice of a stack around the focused element</span>
<a name="line-104"></a><span class='hs-definition'>slice</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>t</span>
<a name="line-105"></a><span class='hs-definition'>slice</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>f</span> <span class='hs-varid'>u</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-106"></a> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>take</span> <span class='hs-layout'>(</span><span class='hs-varid'>nu</span> <span class='hs-varop'>+</span> <span class='hs-varid'>unusedD</span><span class='hs-layout'>)</span> <span class='hs-varid'>u</span><span class='hs-layout'>)</span>
<a name="line-107"></a> <span class='hs-layout'>(</span><span class='hs-varid'>take</span> <span class='hs-layout'>(</span><span class='hs-varid'>nd</span> <span class='hs-varop'>+</span> <span class='hs-varid'>unusedU</span><span class='hs-layout'>)</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-108"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>unusedD</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-varid'>nd</span> <span class='hs-comment'>-</span> <span class='hs-varid'>length</span> <span class='hs-varid'>d</span>
<a name="line-109"></a> <span class='hs-varid'>unusedU</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-varop'>$</span> <span class='hs-varid'>nu</span> <span class='hs-comment'>-</span> <span class='hs-varid'>length</span> <span class='hs-varid'>u</span>
<a name="line-110"></a> <span class='hs-varid'>nd</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>div</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-num'>2</span>
<a name="line-111"></a> <span class='hs-varid'>nu</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>uncurry</span> <span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>divMod</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-num'>2</span>
<a name="line-112"></a>
<a name="line-113"></a><a name="Selection"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Selection</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Sel</span> <span class='hs-layout'>{</span> <span class='hs-varid'>nMaster</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-varid'>start</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-varid'>nRest</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-layout'>}</span>
<a name="line-114"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>)</span>
<a name="line-115"></a>
<a name="line-116"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>LayoutModifier</span> <span class='hs-conid'>Selection</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-117"></a> <span class='hs-varid'>modifyLayout</span> <span class='hs-varid'>s</span> <span class='hs-varid'>w</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span>
<a name="line-118"></a> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span> <span class='hs-layout'>{</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>stack</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>updateAndSelect</span> <span class='hs-varid'>s</span> <span class='hs-varop'><$></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>stack</span> <span class='hs-varid'>w</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-119"></a>
<a name="line-120"></a> <span class='hs-varid'>pureModifier</span> <span class='hs-varid'>sel</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>stk</span> <span class='hs-varid'>wins</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>wins</span><span class='hs-layout'>,</span> <span class='hs-varid'>update</span> <span class='hs-varid'>sel</span> <span class='hs-varop'><$></span> <span class='hs-varid'>stk</span><span class='hs-layout'>)</span>
<a name="line-121"></a>
<a name="line-122"></a> <span class='hs-varid'>pureMess</span> <span class='hs-varid'>sel</span> <span class='hs-varid'>m</span>
<a name="line-123"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unLC</span> <span class='hs-varop'><$></span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-124"></a> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>sel</span> <span class='hs-layout'>{</span> <span class='hs-varid'>nRest</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>nMaster</span> <span class='hs-varid'>sel</span> <span class='hs-varop'>+</span> <span class='hs-varid'>nRest</span> <span class='hs-varid'>sel</span><span class='hs-layout'>)</span> <span class='hs-comment'>-</span> <span class='hs-varid'>nMaster</span> <span class='hs-varid'>sel</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-125"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>IncMasterN</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span>
<a name="line-126"></a> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>sel</span> <span class='hs-layout'>{</span> <span class='hs-varid'>nMaster</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-varid'>nMaster</span> <span class='hs-varid'>sel</span> <span class='hs-varop'>+</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-127"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span>
<a name="line-128"></a> <span class='hs-conid'>Nothing</span>
<a name="line-129"></a>
<a name="line-130"></a><a name="select"></a><span class='hs-definition'>select</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Selection</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>a</span>
<a name="line-131"></a><span class='hs-definition'>select</span> <span class='hs-varid'>s</span> <span class='hs-varid'>stk</span>
<a name="line-132"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>lups</span> <span class='hs-varop'><</span> <span class='hs-varid'>nMaster</span> <span class='hs-varid'>s</span>
<a name="line-133"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>stk</span> <span class='hs-layout'>{</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>down</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>take</span> <span class='hs-layout'>(</span><span class='hs-varid'>nMaster</span> <span class='hs-varid'>s</span> <span class='hs-comment'>-</span> <span class='hs-varid'>lups</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>downs</span> <span class='hs-varop'>++</span>
<a name="line-134"></a> <span class='hs-layout'>(</span><span class='hs-varid'>take</span> <span class='hs-layout'>(</span><span class='hs-varid'>nRest</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>drop</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span> <span class='hs-varid'>s</span> <span class='hs-comment'>-</span> <span class='hs-varid'>lups</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>downs</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-135"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>
<a name="line-136"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>stk</span> <span class='hs-layout'>{</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>up</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>reverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>take</span> <span class='hs-layout'>(</span><span class='hs-varid'>nMaster</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>ups</span> <span class='hs-varop'>++</span> <span class='hs-varid'>drop</span> <span class='hs-layout'>(</span><span class='hs-varid'>start</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>ups</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-137"></a> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>down</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>take</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>nRest</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>lups</span> <span class='hs-comment'>-</span> <span class='hs-varid'>start</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>downs</span> <span class='hs-layout'>}</span>
<a name="line-138"></a> <span class='hs-keyword'>where</span>
<a name="line-139"></a> <span class='hs-varid'>downs</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>down</span> <span class='hs-varid'>stk</span>
<a name="line-140"></a> <span class='hs-varid'>ups</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverse</span> <span class='hs-varop'>$</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>up</span> <span class='hs-varid'>stk</span>
<a name="line-141"></a> <span class='hs-varid'>lups</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varid'>ups</span>
<a name="line-142"></a>
<a name="line-143"></a><a name="updateStart"></a><span class='hs-definition'>updateStart</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Selection</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-144"></a><span class='hs-definition'>updateStart</span> <span class='hs-varid'>s</span> <span class='hs-varid'>stk</span>
<a name="line-145"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>lups</span> <span class='hs-varop'><</span> <span class='hs-varid'>nMaster</span> <span class='hs-varid'>s</span> <span class='hs-comment'>-- the focussed window is in the master pane</span>
<a name="line-146"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>start</span> <span class='hs-varid'>s</span> <span class='hs-varop'>`min`</span> <span class='hs-layout'>(</span><span class='hs-varid'>lups</span> <span class='hs-varop'>+</span> <span class='hs-varid'>ldown</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>nRest</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>`max`</span> <span class='hs-varid'>nMaster</span> <span class='hs-varid'>s</span>
<a name="line-147"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>
<a name="line-148"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>start</span> <span class='hs-varid'>s</span> <span class='hs-varop'>`min`</span> <span class='hs-varid'>lups</span>
<a name="line-149"></a> <span class='hs-varop'>`max`</span> <span class='hs-layout'>(</span><span class='hs-varid'>lups</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>nRest</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-150"></a> <span class='hs-varop'>`min`</span> <span class='hs-layout'>(</span><span class='hs-varid'>lups</span> <span class='hs-varop'>+</span> <span class='hs-varid'>ldown</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>nRest</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-151"></a> <span class='hs-varop'>`max`</span> <span class='hs-varid'>nMaster</span> <span class='hs-varid'>s</span>
<a name="line-152"></a> <span class='hs-keyword'>where</span>
<a name="line-153"></a> <span class='hs-varid'>lups</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varop'>$</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>up</span> <span class='hs-varid'>stk</span>
<a name="line-154"></a> <span class='hs-varid'>ldown</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>length</span> <span class='hs-varop'>$</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>down</span> <span class='hs-varid'>stk</span>
<a name="line-155"></a>
<a name="line-156"></a><a name="update"></a><span class='hs-definition'>update</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Selection</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Selection</span> <span class='hs-varid'>a</span>
<a name="line-157"></a><span class='hs-definition'>update</span> <span class='hs-varid'>sel</span> <span class='hs-varid'>stk</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sel</span> <span class='hs-layout'>{</span> <span class='hs-varid'>start</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>updateStart</span> <span class='hs-varid'>sel</span> <span class='hs-varid'>stk</span> <span class='hs-layout'>}</span>
<a name="line-158"></a>
<a name="line-159"></a><a name="updateAndSelect"></a><span class='hs-definition'>updateAndSelect</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Selection</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-conid'>Stack</span> <span class='hs-varid'>a</span>
<a name="line-160"></a><span class='hs-definition'>updateAndSelect</span> <span class='hs-varid'>sel</span> <span class='hs-varid'>stk</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>select</span> <span class='hs-layout'>(</span><span class='hs-varid'>update</span> <span class='hs-varid'>sel</span> <span class='hs-varid'>stk</span><span class='hs-layout'>)</span> <span class='hs-varid'>stk</span>
</pre></body>
</html>
