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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=UTF-8"> <title>GdkDisplayManager: GDK 3 Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GDK 3 Reference Manual"> <link rel="up" href="reference.html" title="API Reference"> <link rel="prev" href="gdk3-General.html" title="General"> <link rel="next" href="GdkDisplay.html" title="GdkDisplay"> <meta name="generator" content="GTK-Doc V1.32 (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="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#GdkDisplayManager.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> <a href="#GdkDisplayManager.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_properties"> <span class="dim">|</span> <a href="#GdkDisplayManager.properties" class="shortcut">Properties</a></span><span id="nav_signals"> <span class="dim">|</span> <a href="#GdkDisplayManager.signals" class="shortcut">Signals</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="reference.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="gdk3-General.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="GdkDisplay.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="GdkDisplayManager"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="GdkDisplayManager.top_of_page"></a>GdkDisplayManager</span></h2> <p>GdkDisplayManager — Maintains a list of all open GdkDisplays</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="GdkDisplayManager.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody> <tr> <td class="function_type"> <a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="returnvalue">GdkDisplayManager</span></a> * </td> <td class="function_name"> <a class="link" href="GdkDisplayManager.html#gdk-display-manager-get" title="gdk_display_manager_get ()">gdk_display_manager_get</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="returnvalue">GdkDisplay</span></a> * </td> <td class="function_name"> <a class="link" href="GdkDisplayManager.html#gdk-display-manager-get-default-display" title="gdk_display_manager_get_default_display ()">gdk_display_manager_get_default_display</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <span class="returnvalue">void</span> </td> <td class="function_name"> <a class="link" href="GdkDisplayManager.html#gdk-display-manager-set-default-display" title="gdk_display_manager_set_default_display ()">gdk_display_manager_set_default_display</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a href="/usr/share/gtk-doc/html/glib/glib-Singly-Linked-Lists.html#GSList"><span class="returnvalue">GSList</span></a> * </td> <td class="function_name"> <a class="link" href="GdkDisplayManager.html#gdk-display-manager-list-displays" title="gdk_display_manager_list_displays ()">gdk_display_manager_list_displays</a> <span class="c_punctuation">()</span> </td> </tr> <tr> <td class="function_type"> <a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="returnvalue">GdkDisplay</span></a> * </td> <td class="function_name"> <a class="link" href="GdkDisplayManager.html#gdk-display-manager-open-display" title="gdk_display_manager_open_display ()">gdk_display_manager_open_display</a> <span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="GdkDisplayManager.properties"></a><h2>Properties</h2> <div class="informaltable"><table class="informaltable" border="0"> <colgroup> <col width="150px" class="properties_type"> <col width="300px" class="properties_name"> <col width="200px" class="properties_flags"> </colgroup> <tbody><tr> <td class="property_type"> <a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="type">GdkDisplay</span></a> *</td> <td class="property_name"><a class="link" href="GdkDisplayManager.html#GdkDisplayManager--default-display" title="The “default-display” property">default-display</a></td> <td class="property_flags">Read / Write</td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="GdkDisplayManager.signals"></a><h2>Signals</h2> <div class="informaltable"><table class="informaltable" border="0"> <colgroup> <col width="150px" class="signal_proto_type"> <col width="300px" class="signal_proto_name"> <col width="200px" class="signal_proto_flags"> </colgroup> <tbody><tr> <td class="signal_type"><span class="returnvalue">void</span></td> <td class="signal_name"><a class="link" href="GdkDisplayManager.html#GdkDisplayManager-display-opened" title="The “display-opened” signal">display-opened</a></td> <td class="signal_flags"><a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="GdkDisplayManager.other"></a><h2>Types and Values</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="other_proto_type"> <col class="other_proto_name"> </colgroup> <tbody><tr> <td class="datatype_keyword"> </td> <td class="function_name"><a class="link" href="GdkDisplayManager.html#GdkDisplayManager-struct" title="GdkDisplayManager">GdkDisplayManager</a></td> </tr></tbody> </table></div> </div> <div class="refsect1"> <a name="GdkDisplayManager.object-hierarchy"></a><h2>Object Hierarchy</h2> <pre class="screen"> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a> <span class="lineart">╰──</span> GdkDisplayManager </pre> </div> <div class="refsect1"> <a name="GdkDisplayManager.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <gdk/gdk.h> </pre> </div> <div class="refsect1"> <a name="GdkDisplayManager.description"></a><h2>Description</h2> <p>The purpose of the <a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a> singleton object is to offer notification when displays appear or disappear or the default display changes.</p> <p>You can use <a class="link" href="GdkDisplayManager.html#gdk-display-manager-get" title="gdk_display_manager_get ()"><code class="function">gdk_display_manager_get()</code></a> to obtain the <a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a> singleton, but that should be rarely necessary. Typically, initializing GTK+ opens a display that you can work with without ever accessing the <a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a>.</p> <p>The GDK library can be built with support for multiple backends. The <a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a> object determines which backend is used at runtime.</p> <p>When writing backend-specific code that is supposed to work with multiple GDK backends, you have to consider both compile time and runtime. At compile time, use the <a class="link" href="gdk3-General.html#GDK-WINDOWING-X11:CAPS" title="GDK_WINDOWING_X11"><span class="type">GDK_WINDOWING_X11</span></a>, <a class="link" href="gdk3-General.html#GDK-WINDOWING-WIN32:CAPS" title="GDK_WINDOWING_WIN32"><span class="type">GDK_WINDOWING_WIN32</span></a> macros, etc. to find out which backends are present in the GDK library you are building your application against. At runtime, use type-check macros like <code class="function">GDK_IS_X11_DISPLAY()</code> to find out which backend is in use:</p> <div class="refsect3"> <a name="backend-specific"></a><h4>Backend-specific code</h4> <div class="informalexample"> <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</pre></td> <td class="listing_code"><pre class="programlisting"><span class="cp">#ifdef GDK_WINDOWING_X11</span> <span class="k">if</span> <span class="p">(</span><span class="n">GDK_IS_X11_DISPLAY</span> <span class="p">(</span><span class="n">display</span><span class="p">))</span> <span class="p">{</span> <span class="c1">// make X11-specific calls here</span> <span class="p">}</span> <span class="k">else</span> <span class="cp">#endif</span> <span class="cp">#ifdef GDK_WINDOWING_QUARTZ</span> <span class="k">if</span> <span class="p">(</span><span class="n">GDK_IS_QUARTZ_DISPLAY</span> <span class="p">(</span><span class="n">display</span><span class="p">))</span> <span class="p">{</span> <span class="c1">// make Quartz-specific calls here</span> <span class="p">}</span> <span class="k">else</span> <span class="cp">#endif</span> <span class="n">g_error</span> <span class="p">(</span><span class="s">"Unsupported GDK backend"</span><span class="p">);</span></pre></td> </tr> </tbody> </table> </div> <p></p> </div> </div> <div class="refsect1"> <a name="GdkDisplayManager.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="gdk-display-manager-get"></a><h3>gdk_display_manager_get ()</h3> <pre class="programlisting"><a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="returnvalue">GdkDisplayManager</span></a> * gdk_display_manager_get (<em class="parameter"><code><span class="type">void</span></code></em>);</pre> <p>Gets the singleton <a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a> object.</p> <p>When called for the first time, this function consults the <code class="literal">GDK_BACKEND</code> environment variable to find out which of the supported GDK backends to use (in case GDK has been compiled with multiple backends). Applications can use <a class="link" href="gdk3-General.html#gdk-set-allowed-backends" title="gdk_set_allowed_backends ()"><code class="function">gdk_set_allowed_backends()</code></a> to limit what backends can be used.</p> <div class="refsect3"> <a name="gdk-display-manager-get.returns"></a><h4>Returns</h4> <p>The global <a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a> singleton; <a class="link" href="gdk3-General.html#gdk-parse-args" title="gdk_parse_args ()"><code class="function">gdk_parse_args()</code></a>, <a class="link" href="gdk3-General.html#gdk-init" title="gdk_init ()"><code class="function">gdk_init()</code></a>, or <a class="link" href="gdk3-General.html#gdk-init-check" title="gdk_init_check ()"><code class="function">gdk_init_check()</code></a> must have been called first. </p> <p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p> </div> <p class="since">Since: 2.2</p> </div> <hr> <div class="refsect2"> <a name="gdk-display-manager-get-default-display"></a><h3>gdk_display_manager_get_default_display ()</h3> <pre class="programlisting"><a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="returnvalue">GdkDisplay</span></a> * gdk_display_manager_get_default_display (<em class="parameter"><code><a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a> *manager</code></em>);</pre> <p>Gets the default <a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="type">GdkDisplay</span></a>.</p> <div class="refsect3"> <a name="gdk-display-manager-get-default-display.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>manager</p></td> <td class="parameter_description"><p>a <a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="gdk-display-manager-get-default-display.returns"></a><h4>Returns</h4> <p>a <a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="type">GdkDisplay</span></a>, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if there is no default display. </p> <p><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p> </div> <p class="since">Since: 2.2</p> </div> <hr> <div class="refsect2"> <a name="gdk-display-manager-set-default-display"></a><h3>gdk_display_manager_set_default_display ()</h3> <pre class="programlisting"><span class="returnvalue">void</span> gdk_display_manager_set_default_display (<em class="parameter"><code><a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a> *manager</code></em>, <em class="parameter"><code><a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="type">GdkDisplay</span></a> *display</code></em>);</pre> <p>Sets <em class="parameter"><code>display</code></em> as the default display.</p> <div class="refsect3"> <a name="gdk-display-manager-set-default-display.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>manager</p></td> <td class="parameter_description"><p>a <a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>display</p></td> <td class="parameter_description"><p>a <a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="type">GdkDisplay</span></a></p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <p class="since">Since: 2.2</p> </div> <hr> <div class="refsect2"> <a name="gdk-display-manager-list-displays"></a><h3>gdk_display_manager_list_displays ()</h3> <pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Singly-Linked-Lists.html#GSList"><span class="returnvalue">GSList</span></a> * gdk_display_manager_list_displays (<em class="parameter"><code><a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a> *manager</code></em>);</pre> <p>List all currently open displays.</p> <div class="refsect3"> <a name="gdk-display-manager-list-displays.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody><tr> <td class="parameter_name"><p>manager</p></td> <td class="parameter_description"><p>a <a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a></p></td> <td class="parameter_annotations"> </td> </tr></tbody> </table></div> </div> <div class="refsect3"> <a name="gdk-display-manager-list-displays.returns"></a><h4>Returns</h4> <p>a newly allocated <a href="/usr/share/gtk-doc/html/glib/glib-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> of <a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="type">GdkDisplay</span></a> objects. Free with <a href="/usr/share/gtk-doc/html/glib/glib-Singly-Linked-Lists.html#g-slist-free"><code class="function">g_slist_free()</code></a> when you are done with it. </p> <p><span class="annotation">[<acronym title="Free data container after the code is done."><span class="acronym">transfer container</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> GdkDisplay]</span></p> </div> <p class="since">Since: 2.2</p> </div> <hr> <div class="refsect2"> <a name="gdk-display-manager-open-display"></a><h3>gdk_display_manager_open_display ()</h3> <pre class="programlisting"><a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="returnvalue">GdkDisplay</span></a> * gdk_display_manager_open_display (<em class="parameter"><code><a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a> *manager</code></em>, <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre> <p>Opens a display.</p> <div class="refsect3"> <a name="gdk-display-manager-open-display.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>manager</p></td> <td class="parameter_description"><p>a <a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a></p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>name</p></td> <td class="parameter_description"><p>the name of the display to open</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="gdk-display-manager-open-display.returns"></a><h4>Returns</h4> <p>a <a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="type">GdkDisplay</span></a>, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the display could not be opened. </p> <p><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></p> </div> <p class="since">Since: <a class="link" href="api-index-3-0.html#api-index-3.0">3.0</a></p> </div> </div> <div class="refsect1"> <a name="GdkDisplayManager.other_details"></a><h2>Types and Values</h2> <div class="refsect2"> <a name="GdkDisplayManager-struct"></a><h3>GdkDisplayManager</h3> <pre class="programlisting">typedef struct _GdkDisplayManager GdkDisplayManager;</pre> </div> </div> <div class="refsect1"> <a name="GdkDisplayManager.property-details"></a><h2>Property Details</h2> <div class="refsect2"> <a name="GdkDisplayManager--default-display"></a><h3>The <code class="literal">“default-display”</code> property</h3> <pre class="programlisting"> “default-display” <a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="type">GdkDisplay</span></a> *</pre> <p>The default display for GDK.</p> <p>Owner: GdkDisplayManager</p> <p>Flags: Read / Write</p> </div> </div> <div class="refsect1"> <a name="GdkDisplayManager.signal-details"></a><h2>Signal Details</h2> <div class="refsect2"> <a name="GdkDisplayManager-display-opened"></a><h3>The <code class="literal">“display-opened”</code> signal</h3> <pre class="programlisting"><span class="returnvalue">void</span> user_function (<a class="link" href="GdkDisplayManager.html" title="GdkDisplayManager"><span class="type">GdkDisplayManager</span></a> *manager, <a class="link" href="GdkDisplay.html" title="GdkDisplay"><span class="type">GdkDisplay</span></a> *display, <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data)</pre> <p>The ::display-opened signal is emitted when a display is opened.</p> <div class="refsect3"> <a name="GdkDisplayManager-display-opened.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>manager</p></td> <td class="parameter_description"><p>the object on which the signal is emitted</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>display</p></td> <td class="parameter_description"><p>the opened display</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>user_data</p></td> <td class="parameter_description"><p>user data set when the signal handler was connected.</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <p>Flags: <a href="/usr/share/gtk-doc/html/gobject/gobject-Signals.html#G-SIGNAL-RUN-LAST:CAPS">Run Last</a></p> <p class="since">Since: 2.2</p> </div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>