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<title>XMonad/Layout/ToggleLayouts.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE DeriveDataTypeable, FlexibleInstances, MultiParamTypeClasses, PatternGuards #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module : XMonad.Layout.ToggleLayouts</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (c) David Roundy <droundy@darcs.net></span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : none</span>
<a name="line-10"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-11"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- A module to toggle between two layouts.</span>
<a name="line-14"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-15"></a>
<a name="line-16"></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'>ToggleLayouts</span> <span class='hs-layout'>(</span>
<a name="line-17"></a> <span class='hs-comment'>-- * Usage</span>
<a name="line-18"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-19"></a> <span class='hs-varid'>toggleLayouts</span><span class='hs-layout'>,</span> <span class='hs-conid'>ToggleLayout</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-20"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>StackSet</span> <span class='hs-layout'>(</span><span class='hs-conid'>Workspace</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-24"></a>
<a name="line-25"></a><span class='hs-comment'>-- $usage</span>
<a name="line-26"></a><span class='hs-comment'>-- You can use this module with the following in your @~\/.xmonad\/xmonad.hs@:</span>
<a name="line-27"></a><span class='hs-comment'>--</span>
<a name="line-28"></a><span class='hs-comment'>-- > import XMonad.Layout.ToggleLayouts</span>
<a name="line-29"></a><span class='hs-comment'>--</span>
<a name="line-30"></a><span class='hs-comment'>-- Then edit your @layoutHook@ by adding the ToggleLayouts layout:</span>
<a name="line-31"></a><span class='hs-comment'>--</span>
<a name="line-32"></a><span class='hs-comment'>-- > myLayout = toggleLayouts Full (Tall 1 (3/100) (1/2)) ||| etc..</span>
<a name="line-33"></a><span class='hs-comment'>-- > main = xmonad defaultConfig { layoutHook = myLayout }</span>
<a name="line-34"></a><span class='hs-comment'>--</span>
<a name="line-35"></a><span class='hs-comment'>-- For more detailed instructions on editing the layoutHook see:</span>
<a name="line-36"></a><span class='hs-comment'>--</span>
<a name="line-37"></a><span class='hs-comment'>-- "XMonad.Doc.Extending#Editing_the_layout_hook"</span>
<a name="line-38"></a><span class='hs-comment'>--</span>
<a name="line-39"></a><span class='hs-comment'>-- To toggle between layouts add a key binding like</span>
<a name="line-40"></a><span class='hs-comment'>--</span>
<a name="line-41"></a><span class='hs-comment'>-- > , ((modm .|. controlMask, xK_space), sendMessage ToggleLayout)</span>
<a name="line-42"></a><span class='hs-comment'>--</span>
<a name="line-43"></a><span class='hs-comment'>-- or a key binding like</span>
<a name="line-44"></a><span class='hs-comment'>--</span>
<a name="line-45"></a><span class='hs-comment'>-- > , ((modm .|. controlMask, xK_space), sendMessage (Toggle "Full"))</span>
<a name="line-46"></a><span class='hs-comment'>--</span>
<a name="line-47"></a><span class='hs-comment'>-- For detailed instruction on editing the key binding see:</span>
<a name="line-48"></a><span class='hs-comment'>--</span>
<a name="line-49"></a><span class='hs-comment'>-- "XMonad.Doc.Extending#Editing_key_bindings".</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="ToggleLayouts"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>Bool</span> <span class='hs-layout'>(</span><span class='hs-varid'>lt</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>lf</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</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-52"></a><a name="ToggleLayout"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ToggleLayout</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ToggleLayout</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Toggle</span> <span class='hs-conid'>String</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><span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-53"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Message</span> <span class='hs-conid'>ToggleLayout</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="toggleLayouts"></a><span class='hs-definition'>toggleLayouts</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>lt</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lf</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>a</span>
<a name="line-56"></a><span class='hs-definition'>toggleLayouts</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>False</span>
<a name="line-57"></a>
<a name="line-58"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LayoutClass</span> <span class='hs-layout'>(</span><span class='hs-conid'>ToggleLayouts</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-59"></a> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Workspace</span> <span class='hs-varid'>i</span> <span class='hs-layout'>(</span><span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>True</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf</span><span class='hs-layout'>)</span> <span class='hs-varid'>ms</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>ws</span><span class='hs-layout'>,</span><span class='hs-varid'>mlt'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Workspace</span> <span class='hs-varid'>i</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>ms</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-60"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>ws</span><span class='hs-layout'>,</span><span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>lt'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>True</span> <span class='hs-varid'>lt'</span> <span class='hs-varid'>lf</span><span class='hs-layout'>)</span> <span class='hs-varid'>mlt'</span><span class='hs-layout'>)</span>
<a name="line-61"></a>
<a name="line-62"></a> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Workspace</span> <span class='hs-varid'>i</span> <span class='hs-layout'>(</span><span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>False</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf</span><span class='hs-layout'>)</span> <span class='hs-varid'>ms</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>ws</span><span class='hs-layout'>,</span><span class='hs-varid'>mlf'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Workspace</span> <span class='hs-varid'>i</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>ms</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-63"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>ws</span><span class='hs-layout'>,</span><span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>lf'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>False</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf'</span><span class='hs-layout'>)</span> <span class='hs-varid'>mlf'</span><span class='hs-layout'>)</span>
<a name="line-64"></a> <span class='hs-varid'>description</span> <span class='hs-layout'>(</span><span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>True</span> <span class='hs-varid'>lt</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>description</span> <span class='hs-varid'>lt</span>
<a name="line-65"></a> <span class='hs-varid'>description</span> <span class='hs-layout'>(</span><span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>False</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>lf</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>description</span> <span class='hs-varid'>lf</span>
<a name="line-66"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-layout'>(</span><span class='hs-conid'>ToggleLayouts</span> <span class='hs-varid'>bool</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span>
<a name="line-67"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>ReleaseResources</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-68"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>mlf'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>m</span>
<a name="line-69"></a> <span class='hs-varid'>mlt'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>m</span>
<a name="line-70"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-layout'>(</span><span class='hs-varid'>mlt'</span><span class='hs-layout'>,</span><span class='hs-varid'>mlf'</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-71"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span> <span class='hs-layout'>,</span><span class='hs-conid'>Nothing</span> <span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-72"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>lt'</span><span class='hs-layout'>,</span><span class='hs-conid'>Nothing</span> <span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-varid'>bool</span> <span class='hs-varid'>lt'</span> <span class='hs-varid'>lf</span>
<a name="line-73"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span> <span class='hs-layout'>,</span><span class='hs-conid'>Just</span> <span class='hs-varid'>lf'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-varid'>bool</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf'</span>
<a name="line-74"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>lt'</span><span class='hs-layout'>,</span><span class='hs-conid'>Just</span> <span class='hs-varid'>lf'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-varid'>bool</span> <span class='hs-varid'>lt'</span> <span class='hs-varid'>lf'</span>
<a name="line-75"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-layout'>(</span><span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>True</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span>
<a name="line-76"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>ToggleLayout</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>mlt'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>lt</span> <span class='hs-layout'>(</span><span class='hs-conid'>SomeMessage</span> <span class='hs-conid'>Hide</span><span class='hs-layout'>)</span>
<a name="line-77"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>lt'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>id</span> <span class='hs-varid'>mlt'</span>
<a name="line-78"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>False</span> <span class='hs-varid'>lt'</span> <span class='hs-varid'>lf</span>
<a name="line-79"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>Toggle</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span>
<a name="line-80"></a> <span class='hs-varid'>d</span> <span class='hs-varop'>==</span> <span class='hs-varid'>description</span> <span class='hs-varid'>lt</span> <span class='hs-varop'>||</span> <span class='hs-varid'>d</span> <span class='hs-varop'>==</span> <span class='hs-varid'>description</span> <span class='hs-varid'>lf</span> <span class='hs-keyglyph'>=</span>
<a name="line-81"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>mlt'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>lt</span> <span class='hs-layout'>(</span><span class='hs-conid'>SomeMessage</span> <span class='hs-conid'>Hide</span><span class='hs-layout'>)</span>
<a name="line-82"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>lt'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>id</span> <span class='hs-varid'>mlt'</span>
<a name="line-83"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>False</span> <span class='hs-varid'>lt'</span> <span class='hs-varid'>lf</span>
<a name="line-84"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>mlt'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>m</span>
<a name="line-85"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>lt'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>True</span> <span class='hs-varid'>lt'</span> <span class='hs-varid'>lf</span><span class='hs-layout'>)</span> <span class='hs-varid'>mlt'</span>
<a name="line-86"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-layout'>(</span><span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>False</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span>
<a name="line-87"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-conid'>ToggleLayout</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>mlf'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>lf</span> <span class='hs-layout'>(</span><span class='hs-conid'>SomeMessage</span> <span class='hs-conid'>Hide</span><span class='hs-layout'>)</span>
<a name="line-88"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>lf'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>id</span> <span class='hs-varid'>mlf'</span>
<a name="line-89"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>True</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf'</span>
<a name="line-90"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>Toggle</span> <span class='hs-varid'>d</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-layout'>,</span>
<a name="line-91"></a> <span class='hs-varid'>d</span> <span class='hs-varop'>==</span> <span class='hs-varid'>description</span> <span class='hs-varid'>lt</span> <span class='hs-varop'>||</span> <span class='hs-varid'>d</span> <span class='hs-varop'>==</span> <span class='hs-varid'>description</span> <span class='hs-varid'>lf</span> <span class='hs-keyglyph'>=</span>
<a name="line-92"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>mlf'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>lf</span> <span class='hs-layout'>(</span><span class='hs-conid'>SomeMessage</span> <span class='hs-conid'>Hide</span><span class='hs-layout'>)</span>
<a name="line-93"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>lf'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>id</span> <span class='hs-varid'>mlf'</span>
<a name="line-94"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>True</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf'</span>
<a name="line-95"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>mlf'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>lf</span> <span class='hs-varid'>m</span>
<a name="line-96"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>lf'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ToggleLayouts</span> <span class='hs-conid'>False</span> <span class='hs-varid'>lt</span> <span class='hs-varid'>lf'</span><span class='hs-layout'>)</span> <span class='hs-varid'>mlf'</span>
</pre></body>
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