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<title>Dock and undock</title>
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<h2>4.3: Dock and undock&nbsp;<a href="User_guide4.html"><img src="Images/uparrow.png" border="0" align="top" alt="Go back up one level"/></a></h2>
<p>
When a <a href="uix.BoxPanel.html"><code class="FUNCTION">uix.BoxPanel</code></a> has its <code>DockFcn</code>
filled in, a dock/undock button (↘/↗) is shown in the upper-right of the
title-bar. When the user clicks this button the specified function
is called. Since re-docking the panel into its previous parent
depends on the type of parent, it is up to the user to write
some code to actually extract or insert the panel.
</p>
<p>The following simple example shows how to add dock/undock
functionality to a box full of panels. Save the code into
a file called "dockexample.m" to run it.</p>
<p>(The code for this example can be found here:
[ <a href="Examples/dockexample.m">view</a>
| <a href="matlab: edit(fullfile(layoutDocRoot,'Examples','dockexample.m'))">edit</a>
| <a href="matlab: p=pwd();cd(fullfile(layoutDocRoot,'Examples')); dockexample; cd(p)">run</a> ]
)</p>
<h4>Create the layout with three panels</h4>
<p>Open a new figure window and add three panels.</p>
<example><pre style="background-color: #eeeeff; margin-left: 20px; margin-right: 20px"><font color="#000011"><a href="matlab:doc function"><code class="FUNCTION">function</code></a> dockexample()
<code class="COMMENT">% Create the window and main layout</code>
fig = <a href="matlab:doc figure"><code class="FUNCTION">figure</code></a>( <code class="STRING">'Name'</code>, <code class="STRING">'Dockable GUI example'</code>, ...
<code class="STRING">'NumberTitle'</code>, <code class="STRING">'off'</code>, ...
<code class="STRING">'Toolbar'</code>, <code class="STRING">'none'</code>, ...
<code class="STRING">'MenuBar'</code>, <code class="STRING">'none'</code>, ...
<code class="STRING">'CloseRequestFcn'</code>, @nCloseAll );
box = <a href="uix.HBox.html"><code class="FUNCTION">uix.HBox</code></a>( <code class="STRING">'Parent'</code>, fig );
<code class="COMMENT">% Add three panels to the box</code>
panel{1} = <a href="uix.BoxPanel.html"><code class="FUNCTION">uix.BoxPanel</code></a>( <code class="STRING">'Title'</code>, <code class="STRING">'Panel 1'</code>, <code class="STRING">'Parent'</code>, box );
panel{2} = <a href="uix.BoxPanel.html"><code class="FUNCTION">uix.BoxPanel</code></a>( <code class="STRING">'Title'</code>, <code class="STRING">'Panel 2'</code>, <code class="STRING">'Parent'</code>, box );
panel{3} = <a href="uix.BoxPanel.html"><code class="FUNCTION">uix.BoxPanel</code></a>( <code class="STRING">'Title'</code>, <code class="STRING">'Panel 3'</code>, <code class="STRING">'Parent'</code>, box );
<code class="COMMENT">% Add some contents</code><br/>
<a href="matlab:doc uicontrol"><code class="FUNCTION">uicontrol</code></a>( <code class="STRING">'Style'</code>, <code class="STRING">'PushButton'</code>, <code class="STRING">'String'</code>, <code class="STRING">'Button 1'</code>, <code class="STRING">'Parent'</code>, panel{1} );
<a href="matlab:doc uicontrol"><code class="FUNCTION">uicontrol</code></a>( <code class="STRING">'Style'</code>, <code class="STRING">'PushButton'</code>, <code class="STRING">'String'</code>, <code class="STRING">'Button 2'</code>, <code class="STRING">'Parent'</code>, panel{2} );
<a href="matlab:doc uicontrol"><code class="FUNCTION">uicontrol</code></a>( <code class="STRING">'Style'</code>, <code class="STRING">'PushButton'</code>, <code class="STRING">'String'</code>, <code class="STRING">'Button 3'</code>, <code class="STRING">'Parent'</code>, panel{3} );</font></pre>
<p style="background-color: #ddddee; margin-left: 20px; margin-right: 20px"><font color="#000022"><center><img src="Images/BoxPanelDockExample1.png"/></center></font></p>
</example>
<h4>Add the dock/undock callback</h4>
<p>We set each panel to call the same dock/undock function.
This function is nested inside the main function so that it has access
to the main function's variables. A better way to do this is to make the
main function into a class, but this nested-function approach is fine
for simple applications.</p>
<p>Note that as soon as we set the "DockFcn" property the Dock/Undock
icon appears in the top-right of each panel. We use a cell-array to pass an
extra argument, the panel number, to the minimize function. This extra argument appears after the usual
<code>eventSource</code> and <code>eventData</code> arguments.</p>
<example><pre style="background-color: #eeeeff; margin-left: 20px; margin-right: 20px"><font color="#000011"><code class="COMMENT">% Set the dock/undock callback</code><br/>
<a href="matlab:doc set"><code class="FUNCTION">set</code></a>( panel{1}, <code class="STRING">'DockFcn'</code>, {@nDock, 1} );
<a href="matlab:doc set"><code class="FUNCTION">set</code></a>( panel{2}, <code class="STRING">'DockFcn'</code>, {@nDock, 2} );
<a href="matlab:doc set"><code class="FUNCTION">set</code></a>( panel{3}, <code class="STRING">'DockFcn'</code>, {@nDock, 3} );
<code class="COMMENT">%-------------------------------------------------------------------------%</code><br/>
<a href="matlab:doc function"><code class="FUNCTION">function</code></a> nDock( eventSource, eventData, whichpanel )
<code class="COMMENT">% Set the flag</code>
panel{whichpanel}.IsDocked = ~panel{whichpanel}.IsDocked;
<a href="matlab:doc if"><code class="FUNCTION">if</code></a> panel{whichpanel}.IsDocked
<code class="COMMENT">% Put it back into the layout</code>
newfig = <a href="matlab:doc get"><code class="FUNCTION">get</code></a>( panel{whichpanel}, <code class="STRING">'Parent'</code> );
<a href="matlab:doc set"><code class="FUNCTION">set</code></a>( panel{whichpanel}, <code class="STRING">'Parent'</code>, box );
<a href="matlab:doc delete"><code class="FUNCTION">delete</code></a>( newfig );
<a href="matlab:doc else"><code class="FUNCTION">else</code></a>&nbsp;
<code class="COMMENT">% Take it out of the layout</code>
pos = <a href="matlab:doc getpixelposition"><code class="FUNCTION">getpixelposition</code></a>( panel{whichpanel} );
newfig = <a href="matlab:doc figure"><code class="FUNCTION">figure</code></a>( ...
<code class="STRING">'Name'</code>, <a href="matlab:doc get"><code class="FUNCTION">get</code></a>( panel{whichpanel}, <code class="STRING">'Title'</code> ), ...
<code class="STRING">'NumberTitle'</code>, <code class="STRING">'off'</code>, ...
<code class="STRING">'MenuBar'</code>, <code class="STRING">'none'</code>, ...
<code class="STRING">'Toolbar'</code>, <code class="STRING">'none'</code>, ...
<code class="STRING">'CloseRequestFcn'</code>, {@nDock, whichpanel} );
figpos = <a href="matlab:doc get"><code class="FUNCTION">get</code></a>( newfig, <code class="STRING">'Position'</code> );
<a href="matlab:doc set"><code class="FUNCTION">set</code></a>( newfig, <code class="STRING">'Position'</code>, [figpos(1,1:2), pos(1,3:4)] );
<a href="matlab:doc set"><code class="FUNCTION">set</code></a>( p{whichpanel}, <code class="STRING">'Parent'</code>, newfig, ...
<code class="STRING">'Units'</code>, <code class="STRING">'Normalized'</code>, ...
<code class="STRING">'Position'</code>, [0 0 1 1] );
<a href="matlab:doc end"><code class="FUNCTION">end</code></a>&nbsp;
<a href="matlab:doc end"><code class="FUNCTION">end</code></a>&nbsp;<code class="COMMENT">% nDock</code></font></pre></example>
<h4>Add the close callback</h4>
<p>If the user closes the main window we need to also close any
other windows that were created. This can be done by finding
the window that contains each panel and deleting it.</p>
<example><pre style="background-color: #eeeeff; margin-left: 20px; margin-right: 20px"><font color="#000011"><code class="COMMENT">%-------------------------------------------------------------------------%</code><br/>
<a href="matlab:doc function"><code class="FUNCTION">function</code></a> nCloseAll( ~, ~ )
<a href="matlab:doc for"><code class="FUNCTION">for</code></a> ii=1:<a href="matlab:doc numel"><code class="FUNCTION">numel</code></a>( panel )
<a href="matlab:doc if"><code class="FUNCTION">if</code></a> <a href="matlab:doc isvalid"><code class="FUNCTION">isvalid</code></a>( panel{ii} ) && ~<a href="matlab:doc strcmpi"><code class="FUNCTION">strcmpi</code></a>( panel{ii}.BeingDeleted, <code class="STRING">'on'</code> )
figh = <a href="matlab:doc ancestor"><code class="FUNCTION">ancestor</code></a>( panel{ii}, <code class="STRING">'figure'</code> );
<a href="matlab:doc delete"><code class="FUNCTION">delete</code></a>( figh );
<a href="matlab:doc end"><code class="FUNCTION">end</code></a>&nbsp;
<a href="matlab:doc end"><code class="FUNCTION">end</code></a>&nbsp;
<a href="matlab:doc end"><code class="FUNCTION">end</code></a>&nbsp;<code class="COMMENT">% nCloseAll</code>
<a href="matlab:doc end"><code class="FUNCTION">end</code></a>&nbsp;<code class="COMMENT">% Main function</code></font></pre>
<p style="background-color: #ddddee; margin-left: 20px; margin-right: 20px"><font color="#000022"><center><img src="Images/BoxPanelDockExample2.png"/></center></font></p>
</example>
<h4>Click the dock buttons</h4>
<p>Undocking the middle panel causes the other two to fill the
vacated space. The undocked panel appears in its own window, with the
"Undock" icon replaced by a "Dock" icon.</p>
<example><p style="background-color: #ddddee; margin-left: 20px; margin-right: 20px"><font color="#000022"><center><img src="Images/BoxPanelDockExample3.png"/>.<img src="Images/BoxPanelDockExample4.png"/></center></font></p></example>
<p> Re-docking the panel would
cause it to be appended to the right of the list in the original window. Closing the main window
causes all panels, docked or undocked, and their enclosing windows to be closed.</p>
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