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<h2>7.3: updateInterface&nbsp;<a href="User_guide7.html"><img src="Images/uparrow.png" border="0" align="top" alt="Go back up one level"/></a></h2>
<p>The second subfunction we will look at, <code>updateInterface</code>, uses the
current selections to update the interface. This uses the structure
"data" to update various parts of the interface. For this simple example this just means:
</p>
<p><b>1. Update the selected item in the listbox</b></p>
<example><pre style="background-color: #eeeeff; margin-left: 20px; margin-right: 20px"><font color="#000011">set( gui.ListBox, <code class="STRING">'Value'</code>, data.SelectedDemo );</font></pre></example>
<p><b>2. Update the help button label</b></p>
<example><pre style="background-color: #eeeeff; margin-left: 20px; margin-right: 20px"><font color="#000011">demoName = data.DemoNames{ data.SelectedDemo };<br/><a href="matlab:doc set"><code class="FUNCTION">set</code></a>( gui.HelpButton, <code class="STRING">'String'</code>, [<code class="STRING">'Help for '</code>,demoName] );</font></pre></example>
<p><b>3. Update the view panel title</b></p>
<example><pre style="background-color: #eeeeff; margin-left: 20px; margin-right: 20px"><font color="#000011"><a href="matlab:doc set"><code class="FUNCTION">set</code></a>( gui.ViewPanel, <code class="STRING">'Title'</code>, <a href="matlab:doc sprintf"><code class="FUNCTION">sprintf</code></a>( <code class="STRING">'Viewing: %s'</code>, demoName ) );</font></pre></example>
<p><b>4. Update the ticked menu</b></p>
<example><pre style="background-color: #eeeeff; margin-left: 20px; margin-right: 20px"><font color="#000011">menus = <a href="matlab:doc get"><code class="FUNCTION">get</code></a>( gui.ViewMenu, <code class="STRING">'Children'</code> );
<a href="matlab:doc set"><code class="FUNCTION">set</code></a>( menus, <code class="STRING">'Checked'</code>, <code class="STRING">'off'</code> );
<code class="COMMENT">% Use the name to work out which menu item should be ticked</code>
whichMenu = <a href="matlab:doc strcmpi"><code class="FUNCTION">strcmpi</code></a>( demoName, <a href="matlab:doc get"><code class="FUNCTION">get</code></a>( menus, <code class="STRING">'Label'</code> ) );
<a href="matlab:doc set"><code class="FUNCTION">set</code></a>( menus(whichMenu), <code class="STRING">'Checked'</code>, <code class="STRING">'on'</code> );
</font></pre></example>
<example><p style="background-color: #ddddee; margin-left: 20px; margin-right: 20px"><font color="#000022"><center><img src="Images/demoBrowser4.png"/></center></font></p></example>
<p>In general, this update function is called whenever the underlying
shared "data" structure is changed. This happens when the user clicks
a button, selects a list item or a menu. Next we will look at a typical
callback.</p>
<p><small>(Full source code for this application is available here:
[ <a href="Examples/demoBrowser.m">view</a>
| <a href="matlab: edit(fullfile(layoutDocRoot,'Examples','demoBrowser.m'))">edit</a>
| <a href="matlab: p=pwd();cd(fullfile(layoutDocRoot,'Examples')); demoBrowser; cd(p)">run</a> ]
)</small></p>
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