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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="gtkdoc ppc">#include <gtk/gtk.h></span>
<span class="gtkdoc ppc">#include <panel-applet.h></span>
<span class="gtkdoc kwb">static</span> gboolean
<span class="function">hello_world_applet_start</span> <span class="gtkdoc opt">(</span>PanelApplet <span class="gtkdoc opt">*</span>applet<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
GtkWidget <span class="gtkdoc opt">*</span>label<span class="gtkdoc opt">;</span>
label <span class="gtkdoc opt">=</span> <span class="function"><a href="http://developer.gnome.org/gtk2/GtkLabel.html#gtk-label-new">gtk_label_new</a></span> <span class="gtkdoc opt">(</span><span class="string">"Hello World"</span><span class="gtkdoc opt">);</span>
<span class="function"><a href="http://developer.gnome.org/gtk2/GtkContainer.html#gtk-container-add">gtk_container_add</a></span> <span class="gtkdoc opt">(</span><span class="function">GTK_CONTAINER</span> <span class="gtkdoc opt">(</span>applet<span class="gtkdoc opt">),</span> label<span class="gtkdoc opt">);</span>
<span class="function"><a href="http://developer.gnome.org/gtk2/GtkWidget.html#gtk-widget-show-all">gtk_widget_show_all</a></span> <span class="gtkdoc opt">(</span><span class="function">GTK_WIDGET</span> <span class="gtkdoc opt">(</span>applet<span class="gtkdoc opt">));</span>
<span class="keyword">return</span> TRUE<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc kwb">static</span> gboolean
<span class="function">hello_world_factory_callback</span> <span class="gtkdoc opt">(</span>PanelApplet <span class="gtkdoc opt">*</span>applet<span class="gtkdoc opt">,</span>
<span class="gtkdoc kwb">const</span> gchar <span class="gtkdoc opt">*</span>iid<span class="gtkdoc opt">,</span>
gpointer data<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
gboolean retval <span class="gtkdoc opt">=</span> FALSE<span class="gtkdoc opt">;</span>
<span class="keyword">if</span> <span class="gtkdoc opt">(</span><span class="function">g_strcmp0</span> <span class="gtkdoc opt">(</span>iid<span class="gtkdoc opt">,</span> <span class="string">"HelloWorldApplet"</span><span class="gtkdoc opt">) ==</span> <span class="number">0</span><span class="gtkdoc opt">)</span>
retval <span class="gtkdoc opt">=</span> <span class="function">hello_world_applet_start</span> <span class="gtkdoc opt">(</span>applet<span class="gtkdoc opt">);</span>
<span class="keyword">return</span> retval<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="function"><a href="panel-applet-Panel-Applet-Factory.html#PANEL-APPLET-OUT-PROCESS-FACTORY:CAPS">PANEL_APPLET_OUT_PROCESS_FACTORY</a></span> <span class="gtkdoc opt">(</span><span class="string">"HelloWorldFactory"</span><span class="gtkdoc opt">,</span>
PANEL_TYPE_APPLET<span class="gtkdoc opt">,</span>
hello_world_factory_callback<span class="gtkdoc opt">,</span>
NULL<span class="gtkdoc opt">)</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" style="list-style-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="gtkdoc ppc">#include <gtk/gtk.h></span>
<span class="gtkdoc ppc">#include <panel-applet.h></span>
<span class="gtkdoc ppc">#define HELLO_WORLD_TYPE_APPLET (hello_world_applet_get_type ())</span>
<span class="gtkdoc kwc">typedef</span> <span class="gtkdoc kwb">struct</span> _HelloWorldApplet HelloWorldApplet<span class="gtkdoc opt">;</span>
<span class="gtkdoc kwc">typedef</span> <span class="gtkdoc kwb">struct</span> _HelloWorldAppletClass HelloWorldAppletClass<span class="gtkdoc opt">;</span>
<span class="gtkdoc kwc">typedef</span> <span class="gtkdoc kwb">struct</span> _HelloWorldAppletPrivate HelloWorldAppletPrivate<span class="gtkdoc opt">;</span>
<span class="gtkdoc kwb">struct</span> _HelloWorldApplet <span class="gtkdoc opt">{</span>
PanelApplet parent_object<span class="gtkdoc opt">;</span>
<span class="comment">/*< private >*/</span>
HelloWorldAppletPrivate <span class="gtkdoc opt">*</span>priv<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">};</span>
<span class="gtkdoc kwb">struct</span> _HelloWorldAppletClass <span class="gtkdoc opt">{</span>
PanelAppletClass parent_class<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">};</span>
<span class="gtkdoc kwb">struct</span> _HelloWorldAppletPrivate
<span class="gtkdoc opt">{</span>
GtkWidget <span class="gtkdoc opt">*</span>label<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">};</span>
<span class="gtkdoc kwb">static</span> GType <span class="function">hello_world_applet_get_type</span> <span class="gtkdoc opt">(</span><span class="gtkdoc kwb">void</span><span class="gtkdoc opt">)</span> G_GNUC_CONST<span class="gtkdoc opt">;</span>
<span class="function">G_DEFINE_TYPE</span> <span class="gtkdoc opt">(</span>HelloWorldApplet<span class="gtkdoc opt">,</span> hello_world_applet<span class="gtkdoc opt">,</span> PANEL_TYPE_APPLET<span class="gtkdoc opt">);</span>
<span class="gtkdoc kwb">static void</span>
<span class="function">hello_world_applet_init</span> <span class="gtkdoc opt">(</span>HelloWorldApplet <span class="gtkdoc opt">*</span>applet<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
applet<span class="gtkdoc opt">-></span>priv <span class="gtkdoc opt">=</span> <span class="function">G_TYPE_INSTANCE_GET_PRIVATE</span> <span class="gtkdoc opt">(</span>applet<span class="gtkdoc opt">,</span> HELLO_WORLD_TYPE_APPLET<span class="gtkdoc opt">,</span>
HelloWorldAppletPrivate<span class="gtkdoc opt">);</span>
applet<span class="gtkdoc opt">-></span>priv<span class="gtkdoc opt">-></span>label <span class="gtkdoc opt">=</span> <span class="function"><a href="http://developer.gnome.org/gtk2/GtkLabel.html#gtk-label-new">gtk_label_new</a></span> <span class="gtkdoc opt">(</span><span class="string">"Hello World"</span><span class="gtkdoc opt">);</span>
<span class="function"><a href="http://developer.gnome.org/gtk2/GtkContainer.html#gtk-container-add">gtk_container_add</a></span> <span class="gtkdoc opt">(</span><span class="function">GTK_CONTAINER</span> <span class="gtkdoc opt">(</span>applet<span class="gtkdoc opt">),</span> applet<span class="gtkdoc opt">-></span>priv<span class="gtkdoc opt">-></span>label<span class="gtkdoc opt">);</span>
<span class="function"><a href="http://developer.gnome.org/gtk2/GtkWidget.html#gtk-widget-show">gtk_widget_show</a></span> <span class="gtkdoc opt">(</span>applet<span class="gtkdoc opt">-></span>priv<span class="gtkdoc opt">-></span>label<span class="gtkdoc opt">);</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc kwb">static void</span>
<span class="function">hello_world_applet_class_init</span> <span class="gtkdoc opt">(</span>HelloWorldAppletClass <span class="gtkdoc opt">*</span>klass<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
<span class="function">g_type_class_add_private</span> <span class="gtkdoc opt">(</span><span class="gtkdoc kwc">class</span><span class="gtkdoc opt">,</span> <span class="keyword">sizeof</span> <span class="gtkdoc opt">(</span>HelloWorldAppletPrivate<span class="gtkdoc opt">));</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc kwb">static</span> gboolean
<span class="function">hello_world_applet_start</span> <span class="gtkdoc opt">(</span>HelloWorldApplet <span class="gtkdoc opt">*</span>applet<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
<span class="function"><a href="http://developer.gnome.org/gtk2/GtkWidget.html#gtk-widget-show">gtk_widget_show</a></span> <span class="gtkdoc opt">(</span><span class="function">GTK_WIDGET</span> <span class="gtkdoc opt">(</span>applet<span class="gtkdoc opt">));</span>
<span class="keyword">return</span> TRUE<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc kwb">static</span> gboolean
<span class="function">hello_world_factory_callback</span> <span class="gtkdoc opt">(</span>HelloWorldApplet <span class="gtkdoc opt">*</span>applet<span class="gtkdoc opt">,</span>
<span class="gtkdoc kwb">const</span> gchar <span class="gtkdoc opt">*</span>iid<span class="gtkdoc opt">,</span>
gpointer data<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
gboolean retval <span class="gtkdoc opt">=</span> FALSE<span class="gtkdoc opt">;</span>
<span class="keyword">if</span> <span class="gtkdoc opt">(</span><span class="function">g_strcmp0</span> <span class="gtkdoc opt">(</span>iid<span class="gtkdoc opt">,</span> <span class="string">"HelloWorldApplet"</span><span class="gtkdoc opt">) ==</span> <span class="number">0</span><span class="gtkdoc opt">)</span>
retval <span class="gtkdoc opt">=</span> <span class="function">hello_world_applet_start</span> <span class="gtkdoc opt">(</span>applet<span class="gtkdoc opt">);</span>
<span class="keyword">return</span> retval<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="function"><a href="panel-applet-Panel-Applet-Factory.html#PANEL-APPLET-OUT-PROCESS-FACTORY:CAPS">PANEL_APPLET_OUT_PROCESS_FACTORY</a></span> <span class="gtkdoc opt">(</span><span class="string">"HelloWorldFactory"</span><span class="gtkdoc opt">,</span>
HELLO_WORLD_TYPE_APPLET<span class="gtkdoc opt">,</span>
<span class="gtkdoc opt">(</span>PanelAppletFactoryCallback<span class="gtkdoc opt">)</span> hello_world_factory_callback<span class="gtkdoc opt">,</span>
NULL<span class="gtkdoc opt">)</span></pre></td>
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