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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>Part II. Panel Plugins</title>
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<div class="part">
<div class="titlepage"><div><div><h1 class="title">
<a name="libxfce4panel-plugins"></a>Part II. Panel Plugins</h1></div></div></div>
<div class="toc">
<p><b>Table of Contents</b></p>
<dl class="toc">
<dt>
<span class="refentrytitle"><a href="XfcePanelPlugin.html">XfcePanelPlugin</a></span><span class="refpurpose"> — Interface for panel plugins</span>
</dt>
<dt>
<span class="refentrytitle"><a href="libxfce4panel-Panel-Plugin-Register-Macros.html">Panel Plugin Register Macros</a></span><span class="refpurpose"> — Register panel plugins that are compiled as modules.</span>
</dt>
<dt>
<span class="refentrytitle"><a href="libxfce4panel-Panel-Plugin-Register-Macros-(4.6-Style).html">Panel Plugin Register Macros (4.6 Style)</a></span><span class="refpurpose"> — The 4.6 way of registering plugins that compiled as executables</span>
</dt>
<dt>
<span class="refentrytitle"><a href="libxfce4panel-GObject-Oriented-Panel-Plugin-Registers-Macros.html">GObject Oriented Panel Plugin Registers Macros</a></span><span class="refpurpose"> — Macros to register panel plugins, written as GObjects.</span>
</dt>
</dl>
</div>
<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="libxfce4panel-register"></a>Register plugins with the panel</h2></div></div></div>
<p>Since 4.8 there are various ways to register a plugin with the panel. Which option you
      choose depends on a couple of things: is the plugin compiled as a module or as an
      executable and do you want to write a plugin as a GObject.</p>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="idp199424"></a>Internal or external</h3></div></div></div>
<p>In 4.6 you had to choose to compile a plugin as an executable to run it external (with
        the appropriate macro to register external plugins) and the same for internal plugins that
        were compiled a modules. This worked quite good, but had a couple of disadvantages:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p>To switch between internal and external you needed to change the build system and
            registration macros, so this was not very flexible.</p></li>
<li class="listitem"><p>When changes were made in the registration macros (esp the ones for external plugins)
            a plugin had to recompile. Also each plugin copied the same piece of code.</p></li>
<li class="listitem"><p>Improvements in the panel communication (D-Bus) and transparant backgrounds where
            either avoided or hard to implement.</p></li>
</ul></div>
<p>To work around those disadvantages Xfce Panel 4.8 introduced a new way to run plugins
        that are compiled as modules in a separate process: a plugin wrapper. The plugin wrapper is started
        by the panel for each external plugin and embeds the plugin module. It provides the communication
        between the panel and the module using D-Bus and still has the big advantage of the 'old' exectuable
        external plugin: if it crashes it won't crash the panel.</p>
<p>Whether a plugin is started internal or external is defined by the boolean in the
        <code class="varname">X-XFCE-Internal</code> key in the plugins desktop file. No need to change the macros
        and the registration macro code can be kept to an absolute minimum.</p>
<p>This does not mean the 4.6 executable plugins are no supported anymore. However if you write
        a new plugin or you plugin depends on libxfce4panel 4.8, it is recommended to switch to the new
        registration functions and compile your plugin as a module. To make this move obvious the old
        macros are all marked as deprecated in this API reference.</p>
</div>
<div class="sect2">
<div class="titlepage"><div><div><h3 class="title">
<a name="idp115728"></a>GObject plugins</h3></div></div></div>
<p>To handle the difference in 4.6 between internal and external plugins, the plugin API contained
        3 different types. There were two objects <span class="structname">XfceInternalPanelPlugin</span> and
        <span class="structname">XfceExternalPanelPlugin</span> based on a different parents (resp.
        <span class="structname">GtkEventBox</span> and <span class="structname">GtkPlug</span>) that both implemented the
        <span class="structname">XfcePanelPlugin</span> interface.</p>
<p>Because internal and external is handled by the wrapper in 4.8, <span class="structname">XfcePanelPlugin</span>
        is now a single object with <span class="structname">GtkEventBox</span> as parent. Apart from the fact that
        this reduced a lot of code in libxfce4panel, it also has the advantage that it is easier to write
        plugins as GObject with <code class="varname">XFCE_TYPE_PANEL_PLUGIN</code> as parent type. This brings a couple
        of new advantages compared to plugins with register functions:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>You can easily cast you plugin to an <span class="structname">XfcePanelPlugin</span>, so
            no need for custom structures. You also get all the GOBject features like type checking.</p></li></ul></div>
<p>Downside is that you have to register all other types you create inside you plugin and that it
        could be a bit difficult (when running internal) with special libraries. To work around the latter
        you can make you plugin resident.</p>
<p>All the plugins shipped with the panel are written as GObjects, so you can find enough examples
        in the <code class="filename">plugins/</code> folder.</p>
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