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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="getting-started.example"></a>Hello World Example</h2></div></div></div>
<p>
An example is worth a million words, so here is a simple one:
</p>
<div class="example">
<a name="getting-started.example.simple"></a><p class="title"><b>Example 1. Hello World applet</b></p>
<div class="example-contents">
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<td class="listing_code"><pre class="programlisting"><span class="preproc">#include </span><span class="number"><gtk/gtk.h></span>
<span class="preproc">#include </span><span class="number"><panel-applet.h></span>
<span class="type">static</span> gboolean
hello_world_applet_start (PanelApplet *applet)
{
GtkWidget *label;
label = gtk_label_new (<span class="number">"Hello World"</span>);
gtk_container_add (GTK_CONTAINER (applet), label);
gtk_widget_show_all (GTK_WIDGET (applet));
<span class="keyword">return</span> TRUE;
}
<span class="type">static</span> gboolean
hello_world_factory_callback (PanelApplet *applet,
<span class="type">const</span> gchar *iid,
gpointer data)
{
gboolean retval = FALSE;
<span class="keyword">if</span> (g_strcmp0 (iid, <span class="number">"HelloWorldApplet"</span>) == <span class="number">0</span>)
retval = hello_world_applet_start (applet);
<span class="keyword">return</span> retval;
}
PANEL_APPLET_OUT_PROCESS_FACTORY (<span class="number">"HelloWorldFactory"</span>,
PANEL_TYPE_APPLET,
hello_world_factory_callback,
<span class="number">NULL</span>)</pre></td>
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</div>
<br class="example-break"><p>
Here are the few things that are important in this example:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
<a class="link" href="panel-applet-Panel-Applet-Factory.html#PANEL-APPLET-OUT-PROCESS-FACTORY:CAPS" title="PANEL_APPLET_OUT_PROCESS_FACTORY()"><code class="function">PANEL_APPLET_OUT_PROCESS_FACTORY()</code></a>: this creates an <a class="link" href="getting-started.concepts.html#getting-started.concepts.applet-factory" title="Applet Factory">applet factory</a> named <code class="constant">HelloWorldFactory</code>, and each time this applet factory will create an applet instance, it will call <code class="function">hello_world_factory_callback()</code> with a <a class="link" href="panel-applet-Panel-Applet.html#PanelApplet"><span class="type">PanelApplet</span></a> object already created.
</p></li>
<li class="listitem"><p>
<code class="function">hello_world_factory_callback()</code>: this checks if the request to create an applet instance is for an <a class="link" href="getting-started.concepts.html#getting-started.concepts.applet-types" title="Applet Types">applet type</a> supported by the <a class="link" href="getting-started.concepts.html#getting-started.concepts.applet-factory" title="Applet Factory">applet factory</a>. Here we can see that we only support the <code class="constant">HelloWorldApplet</code> applet type. This function returns <code class="constant">TRUE</code> on success and <code class="constant">FALSE</code> on failures.
</p></li>
<li class="listitem"><p>
<code class="function">hello_world_applet_start()</code>: this is where we actually setup the <a class="link" href="panel-applet-Panel-Applet.html#PanelApplet"><span class="type">PanelApplet</span></a> widget for the work the applet should do. This can include filling the widget, connecting to signals, etc.
</p></li>
</ul></div>
<p>
While the previous example is simple, it can be useful to directly subclass the <a class="link" href="panel-applet-Panel-Applet.html#PanelApplet"><span class="type">PanelApplet</span></a> type. This makes it easy to have a per-applet instance private structure, among other benefits.
</p>
<div class="example">
<a name="getting-started.example.subclass"></a><p class="title"><b>Example 2. Hello World applet, with a PanelApplet subclass</b></p>
<div class="example-contents">
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<td class="listing_code"><pre class="programlisting"><span class="preproc">#include </span><span class="number"><gtk/gtk.h></span>
<span class="preproc">#include </span><span class="number"><panel-applet.h></span>
<span class="preproc">#define HELLO_WORLD_TYPE_APPLET (hello_world_applet_get_type ())</span>
<span class="type">typedef</span> <span class="type">struct</span> _HelloWorldApplet HelloWorldApplet;
<span class="type">typedef</span> <span class="type">struct</span> _HelloWorldAppletClass HelloWorldAppletClass;
<span class="type">typedef</span> <span class="type">struct</span> _HelloWorldAppletPrivate HelloWorldAppletPrivate;
<span class="type">struct</span> _HelloWorldApplet {
PanelApplet parent_object;
<span class="comment">/*</span><span class="comment">< private ></span><span class="comment">*/</span>
HelloWorldAppletPrivate *priv;
};
<span class="type">struct</span> _HelloWorldAppletClass {
PanelAppletClass parent_class;
};
<span class="type">struct</span> _HelloWorldAppletPrivate
{
GtkWidget *label;
};
<span class="type">static</span> GType hello_world_applet_get_type (<span class="type">void</span>) G_GNUC_CONST;
G_DEFINE_TYPE (HelloWorldApplet, hello_world_applet, PANEL_TYPE_APPLET);
<span class="type">static</span> <span class="type">void</span>
hello_world_applet_init (HelloWorldApplet *applet)
{
applet->priv = G_TYPE_INSTANCE_GET_PRIVATE (applet, HELLO_WORLD_TYPE_APPLET,
HelloWorldAppletPrivate);
applet->priv->label = gtk_label_new (<span class="number">"Hello World"</span>);
gtk_container_add (GTK_CONTAINER (applet), applet->priv->label);
gtk_widget_show (applet->priv->label);
}
<span class="type">static</span> <span class="type">void</span>
hello_world_applet_class_init (HelloWorldAppletClass *klass)
{
g_type_class_add_private (<span class="type">class</span>, <span class="keyword">sizeof</span> (HelloWorldAppletPrivate));
}
<span class="type">static</span> gboolean
hello_world_applet_start (HelloWorldApplet *applet)
{
gtk_widget_show (GTK_WIDGET (applet));
<span class="keyword">return</span> TRUE;
}
<span class="type">static</span> gboolean
hello_world_factory_callback (HelloWorldApplet *applet,
<span class="type">const</span> gchar *iid,
gpointer data)
{
gboolean retval = FALSE;
<span class="keyword">if</span> (g_strcmp0 (iid, <span class="number">"HelloWorldApplet"</span>) == <span class="number">0</span>)
retval = hello_world_applet_start (applet);
<span class="keyword">return</span> retval;
}
PANEL_APPLET_OUT_PROCESS_FACTORY (<span class="number">"HelloWorldFactory"</span>,
HELLO_WORLD_TYPE_APPLET,
(PanelAppletFactoryCallback) hello_world_factory_callback,
<span class="number">NULL</span>)</pre></td>
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