/usr/share/doc/libgtk2.0-doc/gdk/multihead.html is in libgtk2.0-doc 2.24.10-0ubuntu6.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 | <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Multi-head Support Overview</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.76.1">
<link rel="home" href="index.html" title="GDK 2 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 V1.18 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</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 2 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">
<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">
<a name="id602142"></a><h2>Overview</h2>
<p>
Multihead support is based around two main object types:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>GdkDisplay</p></li>
<li class="listitem"><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" title="gdk_screen_get_default_colormap ()">gdk_screen_get_default_colormap</a>()),
the screen width (<a class="link" href="GdkScreen.html#gdk-screen-get-width" title="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="id611149"></a><p class="title"><b>Example 2. Testing the number of screen on the current display</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="usertype">gint</span><span class="normal"> num_screen </span><span class="symbol">=</span><span class="normal"> </span><span class="number">0</span><span class="symbol">;</span>
<span class="usertype">gchar</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">displayname </span><span class="symbol">=</span><span class="normal"> <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS">NULL</a></span><span class="symbol">;</span>
<span class="usertype">GdkScreen</span><span class="normal"> </span><span class="symbol">**</span><span class="normal">screen_list</span><span class="symbol">;</span>
<span class="usertype">GdkDisplay</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">display</span><span class="symbol">;</span>
<span class="function"><a href="http://library.gnome.org/devel/gtk/gtk3-General.html#gtk-init">gtk_init</a></span><span class="normal"> </span><span class="symbol">(&</span><span class="normal">argc</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">argv</span><span class="symbol">);</span>
<span class="normal">display </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GdkDisplay.html#gdk-display-get-default">gdk_display_get_default</a></span><span class="normal"> </span><span class="symbol">();</span>
<span class="normal">num_screen </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GdkDisplay.html#gdk-display-get-n-screens">gdk_display_get_n_screens</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">display</span><span class="symbol">);</span>
<span class="normal">displayname </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GdkDisplay.html#gdk-display-get-name">gdk_display_get_name</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">display</span><span class="symbol">);</span>
<span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">num_screen </span><span class="symbol"><=</span><span class="normal"> </span><span class="number">1</span><span class="symbol">)</span>
<span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="function">printf</span><span class="normal"> </span><span class="symbol">(</span><span class="string">"This Xserver (%s) manages only one screen. exiting...</span><span class="specialchar">\n</span><span class="string">"</span><span class="symbol">,</span>
<span class="normal"> displayname</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function">exit</span><span class="normal"> </span><span class="symbol">(</span><span class="number">1</span><span class="symbol">);</span>
<span class="normal"> </span><span class="cbracket">}</span>
<span class="keyword">else</span>
<span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="function">printf</span><span class="normal"> </span><span class="symbol">(</span><span class="string">"This Xserver (%s) manages %d screens.</span><span class="specialchar">\n</span><span class="string">"</span><span class="symbol">,</span><span class="normal"> displayname</span><span class="symbol">,</span>
<span class="normal"> num_screen</span><span class="symbol">);</span>
<span class="normal"> </span><span class="cbracket">}</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break"><div class="example">
<a name="id606099"></a><p class="title"><b>Example 3. Opening a second display</b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="usertype">gchar</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">second_screen_name</span><span class="symbol">;</span>
<span class="usertype">GdkDisplay</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">second_display</span><span class="symbol">;</span>
<span class="usertype">GdkScreen</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">second_screen</span><span class="symbol">;</span>
<span class="usertype">GtkWidget</span><span class="normal"> </span><span class="symbol">*</span><span class="normal">window</span><span class="symbol">;</span>
<span class="function"><a href="http://library.gnome.org/devel/gtk/gtk3-General.html#gtk-init">gtk_init</a></span><span class="normal"> </span><span class="symbol">(&</span><span class="normal">argc</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">argv</span><span class="symbol">);</span>
<span class="comment">/* screen2_name needs to be initialized before calling </span>
<span class="comment">/* gdk_display_new() */</span>
<span class="normal">second_display </span><span class="symbol">=</span><span class="normal"> </span><span class="function">gdk_display_new</span><span class="normal"> </span><span class="symbol">(&</span><span class="normal">argc</span><span class="symbol">,</span><span class="normal"> </span><span class="symbol">&</span><span class="normal">argv</span><span class="symbol">,</span><span class="normal"> second_screen_name</span><span class="symbol">);</span>
<span class="keyword">if</span><span class="normal"> </span><span class="symbol">(</span><span class="normal">second_display</span><span class="symbol">)</span>
<span class="normal"> second_screen </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="GdkDisplay.html#gdk-display-get-default-screen">gdk_display_get_default_screen</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">second_display</span><span class="symbol">);</span>
<span class="keyword">else</span><span class="normal"> </span>
<span class="normal"> </span><span class="cbracket">{</span>
<span class="normal"> </span><span class="function"><a href="http://library.gnome.org/devel/glib/unstable/glib-Warnings-and-Assertions.html#g-print">g_print</a></span><span class="normal"> </span><span class="symbol">(</span><span class="string">"Can't open display :</span><span class="specialchar">\n\t</span><span class="string">%s</span><span class="specialchar">\n\n</span><span class="string">"</span><span class="symbol">,</span>
<span class="normal"> second_screen_name</span><span class="symbol">);</span>
<span class="normal"> </span><span class="function">exit</span><span class="normal"> </span><span class="symbol">(</span><span class="number">1</span><span class="symbol">);</span><span class="normal"> </span>
<span class="normal"> </span><span class="cbracket">}</span>
<span class="comment">/* now GdkScreen can be assigned to GtkWindows */</span>
<span class="normal">window </span><span class="symbol">=</span><span class="normal"> </span><span class="function"><a href="http://library.gnome.org/devel/gtk/GtkWindow.html#gtk-window-new">gtk_window_new</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal"><a href="http://library.gnome.org/devel/gtk/gtk3-Standard-Enumerations.html#GTK-WINDOW-TOPLEVEL:CAPS">GTK_WINDOW_TOPLEVEL</a></span><span class="symbol">);</span>
<span class="function"><a href="http://library.gnome.org/devel/gtk/GtkWindow.html#gtk-window-set-screen">gtk_window_set_screen</a></span><span class="normal"> </span><span class="symbol">(</span><span class="normal">window</span><span class="symbol">,</span><span class="normal"> second_screen</span><span class="symbol">);</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<br class="example-break">
</div>
<div class="refsect1">
<a name="id632852"></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>
<div class="footer">
<hr>
Generated by GTK-Doc V1.18</div>
</body>
</html>
|