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<h4 class="subsection">16.5.8 Binding actions to keys</h4>

<p><a name="index-key-815"></a><a name="index-g_t_003ckey_003e-816"></a><!--  -->

<p class="noindent">All the actions defined above can be bound to specific key shortcuts through
the <code>&lt;key&gt;</code> attribute. As usual, it requires one <code>&lt;action&gt;</code>
attribute to specify what to do when the key is pressed. The name of the
action can start with a '/' to indicate that a menu should be executed
instead of a user-defined action.

   <p>If the action is the empty string, then instead the key will no longer be
bound to any action.

   <p>This tag doesn't contain any child tag. Instead, its text contents specified
the keyboard shortcut. The name
of the key can be prefixed by <code>control-</code>, <code>alt-</code>, <code>shift-</code> or
any combination of these to specify the key modifiers to apply.

   <p>You can also define multiple key bindings similar to Emacs's by separating them
by a space. For instance, <code>control-x control-k</code> means that the user should
press &lt;control-x&gt;, followed by a &lt;control-k&gt; to activate the
corresponding action. This is only possible if the prefix key is not already
bound to an action. If it is, you should first unbound it by passing an
empty action to <code>&lt;key&gt;</code>.

   <p>Use an empty string to describe the key binding if you wish to deactivate a
preexisting binding. The second example below deactivates the standard binding.

<pre class="smallexample">     &lt;?xml version="1.0" ?&gt;
     &lt;keys&gt;
       &lt;key action="expand alias"&gt;control-o&lt;/key&gt;
       &lt;key action="Jump to matching delimiter" /&gt;
     
       &lt;!--  Bind a key to a menu --&gt;
       &lt;key action="/Window/Close"&gt;control-x control-w&lt;/key&gt;
     &lt;/key&gt;
</pre>
   <p>Multiple actions can be bound to the same key binding. They will all be
executed in turn, followed by any menu for which this key is an accelerator.

   <p>When GPS processes a <code>&lt;key&gt;</code> tag, it does the following:
     <ul>
<li>Removes all actions bound to that key. 
   This ensures that if you press the key, any action associated with it by
   default in GPS or in some other XML file will no longer be executed, and
   only the last one will be executed. 
<li>Adds the new key to the list of shortcuts that can execute the
   action. Any existing shortcut on the action is preserved, and
   therefore there are multiple possible shortcuts for this action. 
</ul>

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