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<title>Writing Applets: Panel Applet Library Reference Manual</title>
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<div class="chapter">
<div class="titlepage"><div><div><h1 class="title">
<a name="applet-writing"></a>Writing Applets</h1></div></div></div>
<div class="toc"><dl class="toc">
<dt><span class="sect1"><a href="applet-writing.html#hello-world">Hello World Applet</a></span></dt>
<dt><span class="sect1"><a href="server-files.html">UkuiComponent Activation .server Files For Applets</a></span></dt>
<dt><span class="sect1"><a href="applet-popups.html">Defining a Popup Context Menu</a></span></dt>
<dt><span class="sect1"><a href="panel-signals.html">Detecting Changes in the Panel.</a></span></dt>
<dt><span class="sect1"><a href="session-saving.html">Session/Preference Saving.</a></span></dt>
<dt><span class="sect1"><a href="multi-applets.html">Multiple Applets</a></span></dt>
</dl></div>
<p>Writing applets is very simple. You take some boiler plate
code like below, change a couple of things and write the code that
implements your widgetry. The hardest part is writing your widgetry -
and its completely up to yourself how hard that should be.
</p>
<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="hello-world"></a>Hello World Applet</h2></div></div></div>
<p>As usual, following the pointless tradition of starting with
an example of how get 'Hello World' on the screen in some form, here's
just about the simplest applet you could write.
</p>
<pre class="programlisting">
#include <string.h>
#include <ukui-panel-applet.h>
#include <gtk/gtklabel.h>
static gboolean
hello_applet_fill (UkuiPanelApplet *applet,
const gchar *iid,
gpointer data)
{
GtkWidget *label;
if (strcmp (iid, "OAFIID:My_HelloApplet") != 0)
return FALSE;
label = gtk_label_new ("Hello World");
gtk_container_add (GTK_CONTAINER (applet), label);
gtk_widget_show_all (GTK_WIDGET (applet));
return TRUE;
}
UKUI_PANEL_APPLET_UKUICOMPONENT_FACTORY ("OAFIID:My_HelloApplet_Factory",
PANEL_TYPE_APPLET,
"TheHelloWorldApplet",
"0",
hello_applet_fill,
NULL);
</pre>
<p>The code here is very similar to writing a normal UkuiComponent
control. You define a factory using UKUI_PANEL_APPLET_UKUICOMPONENT_FACTORY(),
passing it a factory function like hello_applet_fill().
</p>
<p>libukui-panel-applet automatically creates a #UkuiPanelApplet object
for you, passing this to your factory method. Here, you should fill
the applet with your widgets just like a #GtkBin. For example, if you
were writing a cdplayer applet you would create a #GtkHBox, pack the
hbox with the cdplayer buttons and in turn add the hbox to the applet.
</p>
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