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<div class="refentry" lang="en">
<a name="multihead"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle">Multi-head Support Overview</span></h2>
<p>Multi-head Support Overview — Overview of GdkDisplay and GdkScreen</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1" lang="en">
<a name="id2894514"></a><h2>Overview</h2>
<p>
Multihead support is based around two main object types:
</p>
<div class="itemizedlist"><ul type="disc">
<li><p>GdkDisplay</p></li>
<li><p>GdkScreen</p></li>
</ul></div>
<p>
</p>
<p>
GdkDisplay objects are the GDK
representation of the X Display which can be described as <span class="emphasis"><em>a
workstation consisting of a keyboard a pointing device (such as a
mouse) and one or more screens</em></span>.
It is used to open and keep track of various GdkScreen objects currently
instanciated by the application. It is also used to grab and release
the keyboard and the mouse pointer.
</p>
<p>
GdkScreen objects are the GDK
representation of a physical screen. It is used throughout GDK and GTK+
to specify which screen the top level windows are to be displayed on.
It is also used to query the screen specification and default settings such as
the default colormap (<a href="GdkScreen.html#gdk-screen-get-default-colormap">gdk_screen_get_default_colormap</a>()),
the screen width (<a href="GdkScreen.html#gdk-screen-get-width">gdk_screen_get_width</a>()), etc.
</p>
<p>
The following code samples demonstrate common usage of the objects described above.
</p>
<div class="example">
<a name="id2895209"></a><p class="title"><b>Example 2. Testing the number of screen on the current display</b></p>
<pre class="programlisting">gint num_screen = 0;
gchar *displayname = NULL;
GdkScreen **screen_list;
GdkDisplay *display;
gtk_init (&argc, &argv);
display = gdk_display_get_default ();
num_screen = gdk_display_get_n_screens (display);
displayname = gdk_display_get_name (display);
if (num_screen <= 1)
{
printf ("This Xserver (%s) manages only one screen. exiting...\n",
displayname);
exit (1);
}
else
{
printf ("This Xserver (%s) manages %d screens.\n", displayname,
num_screen);
} </pre>
</div>
<div class="example">
<a name="id2895238"></a><p class="title"><b>Example 3. Opening a second display</b></p>
<pre class="programlisting">gchar *second_screen_name;
GdkDisplay *second_display;
GdkScreen *second_screen;
GtkWidget *window;
gtk_init (&argc, &argv);
/* screen2_name needs to be initialized before calling
/* gdk_display_new() */
second_display = gdk_display_new (&argc, &argv, second_screen_name);
if (second_display)
second_screen = gdk_display_get_default_screen (second_display);
else
{
g_print ("Can't open display :\n\t%s\n\n",
second_screen_name);
exit (1);
}
/* now GdkScreen can be assigned to GtkWindows */
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_screen (window, second_screen);</pre>
</div>
</div>
<div class="refsect1" lang="en">
<a name="id2895266"></a><h2>See Also</h2>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td>
<span class="term">GdkDisplay</span></td>
<td><p>the GDK Object used to represent and manipulate display
related data</p></td>
</tr>
<tr>
<td>
<span class="term">GdkScreen</span></td>
<td><p>the GDK Object used to represent and query screen related
data</p></td>
</tr>
</tbody>
</table></div>
<p>
</p>
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