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<span id="Outline-Views"></span><h2 class="chapter">10 Outline Views</h2>
<p>An <em>outline view</em> is a specialised form of table view designed for displaying hierachical data in a tree like format. It looks alot like a Windows’ TreeView Control, but operates differently, provides much more powerful functionality and it is less tedious to programme.
</p>
<p>The node’s in the outline view can be collapsed and expanded and display a list of sub-nodes. This makes the outline view hierachical.
</p>
<p>It uses the <code>NSOutlineView</code> class, which inherits from <code>NSTableView</code>. This means that most of the behaviour that applies to tableviews also applies to outline views, such as changing columns/rows and their display, etc. It extends the tableview with a hierachial layout for data, in which nodes can be expanded and contracted.
</p>
<p>Like the table view, the outline view control uses a data source object to get it’s data, as well as a delegate to modify it’s behaviour. These are objects implementing the informal protocols <code>NSOutlineViewDataSource</code> and <code>NSOutlineViewDelegate</code>. Although a delegate object is optional, outline views require a data source object.
</p>
<p>See the <cite>GNUstep GUI Reference</cite> for more information about outline views (including class documentation).
</p>
<span id="Using-a-Data-Source"></span><h3 class="section">10.1 Using a Data Source</h3>
<p>The data source for an outline view implements the <code>NSOutlineViewDataSource</code> informal protocol. Some of it’s methods are compulsory; some are not.
</p>
<p>Note that a parameter in many of the delegate’s methods is an untyped object <var>item</var>. This object is supplied by you, and the outline view passes it back to your delegate as a representation of a node or leaf row.
</p>
<p>The outline view requires you implement the following methods:
</p><dl compact="compact">
<dt><code>-(id) outlineView:(NSOutlineView*)outlineView child:(int)index ofItem:(id)item</code></dt>
<dd><p>Returns the item that is the child of <var>item</var> at <var>index</var>. A <code>nil</code> item means that you should return the children of the root item.
</p>
</dd>
<dt><code>-(BOOL) outlineView:(NSOutlineView*)outlineView isItemExpandable:(id)item</code></dt>
<dd><p>Returns whether <var>item</var> is expandable.
</p>
</dd>
<dt><code>-(int) outlineView:(NSOutlineView*)outlineView numberOfChildrenOfItem:(id)item</code></dt>
<dd><p>Returns the number of child items of <var>item</var>.
</p>
</dd>
<dt><code>-(id) outlineView:(NSOutlineView*)outlineView objectValueForTableColumn: (NSTableColumn*)tableColumn byItem:(id)item</code></dt>
<dd><p>Returns the data object for <var>item</var> in <var>tableColumn</var> of the table view.
</p></dd>
</dl>
<p>Full defintions of these (and optional methods) can be found in the <cite>GNUstep GUI Manual</cite>.
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