forked from AuroraMiddleware/gtk
28c2b0a31f
Thu Jun 20 19:41:09 2002 Owen Taylor <otaylor@redhat.com>
* gdk/gdkdisplay.h gdk/gdkscreen.h gdk/**.c gtk/*.c
tests/*.c: Renames:
gdk_get_default_display => gdk_display_get_default
gdk_get_default_screen => gdk_screen_get_default
gdk_open_display => gdk_display_open
125 lines
3.8 KiB
Plaintext
125 lines
3.8 KiB
Plaintext
<refentry id="multihead" revision="1 May 2002">
|
|
<refmeta>
|
|
<refentrytitle>Multi-head Support Overview</refentrytitle>
|
|
<manvolnum>3</manvolnum>
|
|
<refmiscinfo>GDK Library</refmiscinfo>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>Multi-head Support Overview</refname>
|
|
<refpurpose>Overview of GdkDisplay and GdkScreen</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsect1>
|
|
<title>Overview</title>
|
|
<para>
|
|
Multihead support is based around two main object types:
|
|
<itemizedlist>
|
|
<listitem><para>GdkDisplay</para></listitem>
|
|
<listitem><para>GdkScreen</para></listitem>
|
|
</itemizedlist>
|
|
</para>
|
|
|
|
<para>
|
|
<link linkend="gdk-GdkDisplay">GdkDisplay</link> objects are the GDK
|
|
representation of the X Display which can be described as <emphasis>a
|
|
workstation consisting of a keyboard a pointing device (such as a
|
|
mouse) and one or more screens</emphasis>.
|
|
It is used to open and keep track of various <link
|
|
linkend="gdk-GdkScreen">GdkScreen</link> objects currently
|
|
instanciated by the application. It is also used to grab and release
|
|
the keyboard and the mouse pointer.
|
|
</para>
|
|
<para>
|
|
<link linkend="gdk-GdkScreen">GdkScreen</link> 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 (<link linkend="gdk-screen-get-default-colormap">gdk_screen_get_default_colormap</link>()),
|
|
the screen width (<link linkend="gdk-screen-get-width">gdk_screen_get_width</link>()), etc.
|
|
</para>
|
|
<para>
|
|
The following code samples demonstrate common usage of the objects described above.
|
|
</para>
|
|
|
|
<example>
|
|
<title>Testing the number of screen on the current display</title>
|
|
<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);
|
|
}<!--
|
|
|
|
--> </programlisting>
|
|
</example>
|
|
<example>
|
|
<title>Opening a second display</title>
|
|
<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);<!--
|
|
--></programlisting>
|
|
</example>
|
|
</refsect1>
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><link linkend="gdk-GdkDisplay">GdkDisplay</link></term>
|
|
<listitem><para>the GDK Object used to represent and manipulate display
|
|
related data</para></listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><link linkend="gdk-GdkScreen">GdkScreen</link></term>
|
|
<listitem><para>the GDK Object used to represent and query screen related
|
|
data</para></listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|
|
|
|
<!--
|
|
Local variables:
|
|
mode: sgml
|
|
sgml-parent-document: ("gdk-docs.sgml" "book" "refentry" "")
|
|
End:
|
|
-->
|