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AsyncDisplayKit/appledoc/Classes/ASStackLayoutSpec.html
2015-07-13 07:44:15 +07:00

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<h1 class="title">ASStackLayoutSpec Class Reference</h1>
<div class="section section-specification"><table cellspacing="0"><tbody>
<tr>
<th>Inherits from</th>
<td><a href="../Classes/ASLayoutSpec.html">ASLayoutSpec</a> : NSObject</td>
</tr><tr>
<th>Declared in</th>
<td>ASStackLayoutSpec.h</td>
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<h2 class="subtitle subtitle-overview">Overview</h2>
<p>A simple layout spec that stacks a list of children vertically or horizontally.</p>
<ul>
<li>All children are initially laid out with the an infinite available size in the stacking direction.</li>
<li>In the other direction, this spec&rsquo;s constraint is passed.</li>
<li>The children&rsquo;s sizes are summed in the stacking direction.
<ul>
<li>If this sum is less than this spec&rsquo;s minimum size in stacking direction, children with flexGrow are flexed.</li>
<li>If it is greater than this spec&rsquo;s maximum size in the stacking direction, children with flexShrink are flexed.</li>
<li>If, even after flexing, the sum is still greater than this spec&rsquo;s maximum size in the stacking direction,
justifyContent determines how children are laid out.</li>
</ul>
</li>
</ul>
<p>For example:</p>
<ul>
<li>Suppose stacking direction is Vertical, min-width=100, max-width=300, min-height=200, max-height=500.</li>
<li>All children are laid out with min-width=100, max-width=300, min-height=0, max-height=INFINITY.</li>
<li>If the sum of the childrens' heights is less than 200, children with flexGrow are flexed larger.</li>
<li>If the sum of the childrens' heights is greater than 500, children with flexShrink are flexed smaller.
Each child is shrunk by <code>((sum of heights) - 500)/(number of flexShrink-able children)</code>.</li>
<li>If the sum of the childrens' heights is greater than 500 even after flexShrink-able children are flexed,
justifyContent determines how children are laid out.</li>
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<h3 class="method-title"><code><a href="#//api/name/newWithStyle:children:">+&nbsp;newWithStyle:children:</a></code>
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<p>Specifies how children are laid out.</p>
</div>
<div class="method-subsection method-declaration"><code>+ (instancetype)newWithStyle:(ASStackLayoutSpecStyle)<em>style</em> children:(NSArray *)<em>children</em></code></div>
<div class="method-subsection arguments-section parameters">
<h4 class="method-subtitle parameter-title">Parameters</h4>
<table class="argument-def parameter-def">
<tr>
<th scope="row" class="argument-name"><code>style</code></th>
<td><p>Specifies how children are laid out.</p></td>
</tr>
<tr>
<th scope="row" class="argument-name"><code>children</code></th>
<td><p>ASLayoutable children to be positioned.</p></td>
</tr>
</table>
</div>
<div class="method-subsection declared-in-section">
<h4 class="method-subtitle">Declared In</h4>
<p><code class="declared-in-ref">ASStackLayoutSpec.h</code></p>
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