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<!DOCTYPE html>
<html>
<head>
<title>composer.coffee</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, target-densitydpi=160dpi, initial-scale=1.0; maximum-scale=1.0; user-scalable=0;">
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<li id="title">
<div class="annotation">
<h1>composer.coffee</h1>
</div>
</li>
<li id="section-1">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-1">¶</a>
</div>
</div>
<div class="content"><div class='highlight'><pre><span class="string">'use strict'</span>
_ = <span class="built_in">require</span> <span class="string">'underscore'</span>
Backbone = <span class="built_in">require</span> <span class="string">'backbone'</span>
mediator = <span class="built_in">require</span> <span class="string">'chaplin/mediator'</span>
utils = <span class="built_in">require</span> <span class="string">'chaplin/lib/utils'</span>
Composition = <span class="built_in">require</span> <span class="string">'chaplin/lib/composition'</span>
EventBroker = <span class="built_in">require</span> <span class="string">'chaplin/lib/event_broker'</span></pre></div></div>
</li>
<li id="section-2">
<div class="annotation">
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</div>
<h2 id="composer">Composer</h2>
</div>
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<p>The sole job of the composer is to allow views to be 'composed'.</p>
<p>If the view has already been composed by a previous action then nothing
apart from registering the view as in use happens. Else, the view
is instantiated and passed the options that were passed in. If an action
is routed to where a view that was composed is not re-composed, the
composed view is disposed.</p>
</div>
<div class="content"><div class='highlight'><pre>module.<span class="built_in">exports</span> = <span class="class"><span class="keyword">class</span> <span class="title">Composer</span></span></pre></div></div>
</li>
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<p>Borrow the static extend method from Backbone</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@extend</span> = Backbone.Model.extend</pre></div></div>
</li>
<li id="section-5">
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<p>Mixin an EventBroker</p>
</div>
<div class="content"><div class='highlight'><pre> _.extend <span class="property">@prototype</span>, EventBroker</pre></div></div>
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<p>The collection of composed compositions</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">compositions</span>: <span class="literal">null</span>
<span class="attribute">constructor</span>:<span class="function"> -></span>
<span class="property">@initialize</span> arguments...
<span class="attribute">initialize</span>: <span class="function"><span class="params">(options = {})</span> -></span></pre></div></div>
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<p>Initialize collections.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@compositions</span> = {}</pre></div></div>
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<p>Subscribe to events.</p>
</div>
<div class="content"><div class='highlight'><pre> mediator.setHandler <span class="string">'composer:compose'</span>, <span class="property">@compose</span>, <span class="keyword">this</span>
mediator.setHandler <span class="string">'composer:retrieve'</span>, <span class="property">@retrieve</span>, <span class="keyword">this</span>
<span class="property">@subscribeEvent</span> <span class="string">'dispatcher:dispatch'</span>, <span class="property">@cleanup</span></pre></div></div>
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<p>Constructs a composition and composes into the active compositions.
This function has several forms as described below:</p>
<ol>
<li><p>compose('name', Class[, options])
Composes a class object. The options are passed to the class when
an instance is contructed and are further used to test if the
composition should be re-composed.</p>
</li>
<li><p>compose('name', function)
Composes a function that executes in the context of the controller;
do NOT bind the function context.</p>
</li>
<li><p>compose('name', options, function)
Composes a function that executes in the context of the controller;
do NOT bind the function context and is passed the options as a
parameter. The options are further used to test if the composition
should be recomposed.</p>
</li>
<li><p>compose('name', options)
Gives control over the composition process; the compose method of
the options hash is executed in place of the function of form (3) and
the check method is called (if present) to determine re-composition (
otherwise this is the same as form [3]).</p>
</li>
<li><p>compose('name', CompositionClass[, options])
Gives complete control over the composition process.</p>
</li>
</ol>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">compose</span>: <span class="function"><span class="params">(name, second, third)</span> -></span></pre></div></div>
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<p>Normalize the arguments
If the second parameter is a function we know it is (1) or (2).</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> <span class="keyword">typeof</span> second <span class="keyword">is</span> <span class="string">'function'</span></pre></div></div>
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<p>This is form (1) or (5) with the optional options hash if the third
is an obj or the second parameter's prototype has a dispose method</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> third <span class="keyword">or</span> <span class="attribute">second</span>::dispose</pre></div></div>
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<p>If the class is a Composition class then it is form (5).</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> second.prototype <span class="keyword">instanceof</span> Composition
<span class="keyword">return</span> <span class="property">@_compose</span> name, <span class="attribute">composition</span>: second, <span class="attribute">options</span>: third
<span class="keyword">else</span>
<span class="keyword">return</span> <span class="property">@_compose</span> name, <span class="attribute">options</span>: third, <span class="attribute">compose</span>:<span class="function"> -></span></pre></div></div>
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<p>The compose method here just constructs the class.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@item</span> = <span class="keyword">new</span> second <span class="property">@options</span></pre></div></div>
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<p>Render this item if it has a render method and it either
doesn't have an autoRender property or that autoRender
property is false</p>
</div>
<div class="content"><div class='highlight'><pre> autoRender = <span class="property">@item</span>.autoRender
disabledAutoRender = autoRender <span class="keyword">is</span> <span class="literal">undefined</span> <span class="keyword">or</span> <span class="keyword">not</span> autoRender
<span class="keyword">if</span> disabledAutoRender <span class="keyword">and</span> <span class="keyword">typeof</span> <span class="property">@item</span>.render <span class="keyword">is</span> <span class="string">'function'</span>
<span class="property">@item</span>.render()</pre></div></div>
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<p>This is form (2).</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">return</span> <span class="property">@_compose</span> name, <span class="attribute">compose</span>: second</pre></div></div>
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<p>If the third parameter exists and is a function this is (3).</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> <span class="keyword">typeof</span> third <span class="keyword">is</span> <span class="string">'function'</span>
<span class="keyword">return</span> <span class="property">@_compose</span> name, <span class="attribute">compose</span>: third, <span class="attribute">options</span>: second</pre></div></div>
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<p>This must be form (4).</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">return</span> <span class="property">@_compose</span> name, second
<span class="attribute">_compose</span>: <span class="function"><span class="params">(name, options)</span> -></span></pre></div></div>
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<p>Assert for programmer errors</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> <span class="keyword">typeof</span> options.compose <span class="keyword">isnt</span> <span class="string">'function'</span> <span class="keyword">and</span> <span class="keyword">not</span> options.composition?
<span class="keyword">throw</span> <span class="keyword">new</span> Error <span class="string">'Composer#compose was used incorrectly'</span>
<span class="keyword">if</span> options.composition?</pre></div></div>
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<p>Use the passed composition directly</p>
</div>
<div class="content"><div class='highlight'><pre> composition = <span class="keyword">new</span> options.composition options.options
<span class="keyword">else</span></pre></div></div>
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<p>Create the composition and apply the methods (if available)</p>
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<div class="content"><div class='highlight'><pre> composition = <span class="keyword">new</span> Composition options.options
composition.compose = options.compose
composition.check = options.check <span class="keyword">if</span> options.check</pre></div></div>
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<p>Check for an existing composition</p>
</div>
<div class="content"><div class='highlight'><pre> current = <span class="property">@compositions</span>[name]
isPromise = <span class="literal">false</span></pre></div></div>
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<p>Apply the check method</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> current <span class="keyword">and</span> current.check composition.options</pre></div></div>
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<p>Mark the current composition as not stale</p>
</div>
<div class="content"><div class='highlight'><pre> current.stale <span class="literal">false</span>
<span class="keyword">else</span></pre></div></div>
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<p>Remove the current composition and apply this one</p>
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<div class="content"><div class='highlight'><pre> current.dispose() <span class="keyword">if</span> current
returned = composition.compose composition.options
isPromise = (<span class="keyword">typeof</span> returned?.<span class="keyword">then</span> <span class="keyword">is</span> <span class="string">'function'</span>)
composition.stale <span class="literal">false</span>
<span class="property">@compositions</span>[name] = composition</pre></div></div>
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<p>Return the active composition</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="keyword">if</span> isPromise
returned
<span class="keyword">else</span>
<span class="property">@compositions</span>[name].item</pre></div></div>
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<p>Retrieves an active composition using the compose method.</p>
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<div class="content"><div class='highlight'><pre> <span class="attribute">retrieve</span>: <span class="function"><span class="params">(name)</span> -></span>
active = <span class="property">@compositions</span>[name]
(<span class="keyword">if</span> active <span class="keyword">and</span> <span class="keyword">not</span> active.stale() <span class="keyword">then</span> active.item <span class="keyword">else</span> <span class="literal">undefined</span>)</pre></div></div>
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<p>Declare all compositions as stale and remove all that were previously
marked stale without being re-composed.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="attribute">cleanup</span>:<span class="function"> -></span></pre></div></div>
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<p>Action method is done; perform post-action clean up
Dispose and delete all no-longer-active compositions.
Declare all active compositions as de-activated (eg. to be removed
on the next controller startup unless they are re-composed).</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">for</span> name, composition <span class="keyword">of</span> <span class="property">@compositions</span>
<span class="keyword">if</span> composition.stale()
composition.dispose()
<span class="keyword">delete</span> <span class="property">@compositions</span>[name]
<span class="keyword">else</span>
composition.stale <span class="literal">true</span></pre></div></div>
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<p>Return nothing.</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">return</span>
<span class="attribute">dispose</span>:<span class="function"> -></span>
<span class="keyword">return</span> <span class="keyword">if</span> <span class="property">@disposed</span></pre></div></div>
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<p>Unbind handlers of global events</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@unsubscribeAllEvents</span>()
mediator.removeHandlers <span class="keyword">this</span></pre></div></div>
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<p>Dispose of all compositions and their items (that can be)</p>
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<div class="content"><div class='highlight'><pre> composition.dispose() <span class="keyword">for</span> name, composition <span class="keyword">of</span> <span class="property">@compositions</span></pre></div></div>
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<p>Remove properties</p>
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<div class="content"><div class='highlight'><pre> <span class="keyword">delete</span> <span class="property">@compositions</span></pre></div></div>
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<p>Finished</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@disposed</span> = <span class="literal">true</span></pre></div></div>
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<p>You’re frozen when your heart’s not open</p>
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<div class="content"><div class='highlight'><pre> Object.freeze? <span class="keyword">this</span></pre></div></div>
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