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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"><title>Multi-head Support Overview</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2"><link rel="start" href="index.html" title="GDK Reference Manual"><link rel="up" href="reference.html" title="API Reference"><link rel="prev" href="gdk-General.html" title="General"><link rel="next" href="GdkDisplay.html" title="GdkDisplay"><meta name="generator" content="GTK-Doc V1.9 (XML mode)"><link rel="stylesheet" href="style.css" type="text/css"><link rel="reference" href="reference.html" title="API Reference"><link rel="index" href="ix01.html" title="Index"><link rel="index" href="ix02.html" title="Index of deprecated symbols"><link rel="index" href="ix03.html" title="Index of new symbols in 2.2"><link rel="index" href="ix04.html" title="Index of new symbols in 2.4"><link rel="index" href="ix05.html" title="Index of new symbols in 2.6"><link rel="index" href="ix06.html" title="Index of new symbols in 2.8"><link rel="index" href="ix07.html" title="Index of new symbols in 2.10"><link rel="index" href="ix08.html" title="Index of new symbols in 2.12"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle"><td><a accesskey="p" href="gdk-General.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td><td><a accesskey="u" href="reference.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td><td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td><th width="100%" align="center">GDK Reference Manual</th><td><a accesskey="n" href="GdkDisplay.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td></tr></table><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="id3050801"></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 class="link" href="GdkScreen.html#gdk-screen-get-default-colormap">gdk_screen_get_default_colormap</a>()), the screen width (<a class="link" 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="id3051479"></a><p class="title"><b>Example 2. Testing the number of screen on the current display</b></p><div class="example-contents"><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><br class="example-break"><div class="example"><a name="id3051508"></a><p class="title"><b>Example 3. Opening a second display</b></p><div class="example-contents"><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><br class="example-break"></div><div class="refsect1" lang="en"><a name="id3051534"></a><h2>See Also</h2><p> </p><div class="variablelist"><table border="0"><col align="left" valign="top"><tbody><tr><td><p><span class="term">GdkDisplay</span></p></td><td><p>the GDK Object used to represent and manipulate display related data</p></td></tr><tr><td><p><span class="term">GdkScreen</span></p></td><td><p>the GDK Object used to represent and query screen related data</p></td></tr></tbody></table></div><p> </p></div></div></body></html>⌨️ 快捷键说明
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