236 lines
12 KiB
HTML
236 lines
12 KiB
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>GtkOffscreenWindow: GTK+ 3 Reference Manual</title>
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<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span>
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<a href="#GtkOffscreenWindow.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span>
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<a href="#GtkOffscreenWindow.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_interfaces"> <span class="dim">|</span>
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<a href="#GtkOffscreenWindow.implemented-interfaces" class="shortcut">Implemented Interfaces</a></span>
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<a name="GtkOffscreenWindow"></a><div class="titlepage"></div>
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<div class="refnamediv"><table width="100%"><tr>
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<td valign="top">
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<h2><span class="refentrytitle"><a name="GtkOffscreenWindow.top_of_page"></a>GtkOffscreenWindow</span></h2>
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<p>GtkOffscreenWindow — A toplevel to manage offscreen rendering of child widgets</p>
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</td>
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<td class="gallery_image" valign="top" align="right"></td>
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</tr></table></div>
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<div class="refsect1">
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<a name="GtkOffscreenWindow.functions"></a><h2>Functions</h2>
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<div class="informaltable"><table class="informaltable" width="100%" border="0">
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<colgroup>
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<col width="150px" class="functions_return">
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<col class="functions_name">
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</colgroup>
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<tbody>
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<tr>
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<td class="function_type">
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<a class="link" href="GtkWidget.html" title="GtkWidget"><span class="returnvalue">GtkWidget</span></a> *
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</td>
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<td class="function_name">
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<a class="link" href="GtkOffscreenWindow.html#gtk-offscreen-window-new" title="gtk_offscreen_window_new ()">gtk_offscreen_window_new</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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<tr>
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<td class="function_type">
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<span class="returnvalue">cairo_surface_t</span> *
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</td>
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<td class="function_name">
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<a class="link" href="GtkOffscreenWindow.html#gtk-offscreen-window-get-surface" title="gtk_offscreen_window_get_surface ()">gtk_offscreen_window_get_surface</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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<tr>
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<td class="function_type">
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<span class="returnvalue">GdkPixbuf</span> *
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</td>
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<td class="function_name">
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<a class="link" href="GtkOffscreenWindow.html#gtk-offscreen-window-get-pixbuf" title="gtk_offscreen_window_get_pixbuf ()">gtk_offscreen_window_get_pixbuf</a> <span class="c_punctuation">()</span>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<div class="refsect1">
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<a name="GtkOffscreenWindow.other"></a><h2>Types and Values</h2>
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<div class="informaltable"><table class="informaltable" width="100%" border="0">
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<colgroup>
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<col width="150px" class="name">
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<col class="description">
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</colgroup>
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<tbody>
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<tr>
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<td class="datatype_keyword">struct</td>
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<td class="function_name"><a class="link" href="GtkOffscreenWindow.html#GtkOffscreenWindow-struct" title="struct GtkOffscreenWindow">GtkOffscreenWindow</a></td>
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</tr>
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<tr>
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<td class="datatype_keyword">struct</td>
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<td class="function_name"><a class="link" href="GtkOffscreenWindow.html#GtkOffscreenWindowClass" title="struct GtkOffscreenWindowClass">GtkOffscreenWindowClass</a></td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<div class="refsect1">
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<a name="GtkOffscreenWindow.object-hierarchy"></a><h2>Object Hierarchy</h2>
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<pre class="screen"> GObject
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<span class="lineart">╰──</span> GInitiallyUnowned
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<span class="lineart">╰──</span> <a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a>
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<span class="lineart">╰──</span> <a class="link" href="GtkContainer.html" title="GtkContainer">GtkContainer</a>
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<span class="lineart">╰──</span> <a class="link" href="GtkBin.html" title="GtkBin">GtkBin</a>
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<span class="lineart">╰──</span> <a class="link" href="GtkWindow.html" title="GtkWindow">GtkWindow</a>
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<span class="lineart">╰──</span> GtkOffscreenWindow
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</pre>
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</div>
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<div class="refsect1">
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<a name="GtkOffscreenWindow.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
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<p>
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GtkOffscreenWindow implements
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AtkImplementorIface and <a class="link" href="GtkBuildable.html" title="GtkBuildable">GtkBuildable</a>.</p>
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</div>
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<div class="refsect1">
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<a name="GtkOffscreenWindow.includes"></a><h2>Includes</h2>
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<pre class="synopsis">#include <gtk/gtk.h>
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</pre>
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</div>
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<div class="refsect1">
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<a name="GtkOffscreenWindow.description"></a><h2>Description</h2>
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<p>GtkOffscreenWindow is strictly intended to be used for obtaining
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snapshots of widgets that are not part of a normal widget hierarchy.
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Since <a class="link" href="GtkOffscreenWindow.html" title="GtkOffscreenWindow"><span class="type">GtkOffscreenWindow</span></a> is a toplevel widget you cannot obtain
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snapshots of a full window with it since you cannot pack a toplevel
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widget in another toplevel.</p>
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<p>The idea is to take a widget and manually set the state of it,
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add it to a GtkOffscreenWindow and then retrieve the snapshot
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as a <span class="type">cairo_surface_t</span> or <span class="type">GdkPixbuf</span>.</p>
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<p>GtkOffscreenWindow derives from <a class="link" href="GtkWindow.html" title="GtkWindow"><span class="type">GtkWindow</span></a> only as an implementation
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detail. Applications should not use any API specific to <a class="link" href="GtkWindow.html" title="GtkWindow"><span class="type">GtkWindow</span></a>
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to operate on this object. It should be treated as a <a class="link" href="GtkBin.html" title="GtkBin"><span class="type">GtkBin</span></a> that
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has no parent widget.</p>
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<p>When contained offscreen widgets are redrawn, GtkOffscreenWindow
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will emit a <a class="link" href="GtkWidget.html#GtkWidget-damage-event" title="The “damage-event” signal"><span class="type">“damage-event”</span></a> signal.</p>
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</div>
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<div class="refsect1">
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<a name="GtkOffscreenWindow.functions_details"></a><h2>Functions</h2>
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<div class="refsect2">
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<a name="gtk-offscreen-window-new"></a><h3>gtk_offscreen_window_new ()</h3>
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<pre class="programlisting"><a class="link" href="GtkWidget.html" title="GtkWidget"><span class="returnvalue">GtkWidget</span></a> *
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gtk_offscreen_window_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
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<p>Creates a toplevel container widget that is used to retrieve
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snapshots of widgets without showing them on the screen.</p>
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<div class="refsect3">
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<a name="gtk-offscreen-window-new.returns"></a><h4>Returns</h4>
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<p> A pointer to a <a class="link" href="GtkWidget.html" title="GtkWidget"><span class="type">GtkWidget</span></a></p>
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</div>
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<p class="since">Since: 2.20</p>
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</div>
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<hr>
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<div class="refsect2">
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<a name="gtk-offscreen-window-get-surface"></a><h3>gtk_offscreen_window_get_surface ()</h3>
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<pre class="programlisting"><span class="returnvalue">cairo_surface_t</span> *
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gtk_offscreen_window_get_surface (<em class="parameter"><code><a class="link" href="GtkOffscreenWindow.html" title="GtkOffscreenWindow"><span class="type">GtkOffscreenWindow</span></a> *offscreen</code></em>);</pre>
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<p>Retrieves a snapshot of the contained widget in the form of
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a <span class="type">cairo_surface_t</span>. If you need to keep this around over window
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resizes then you should add a reference to it.</p>
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<div class="refsect3">
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<a name="gtk-offscreen-window-get-surface.parameters"></a><h4>Parameters</h4>
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<div class="informaltable"><table class="informaltable" width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody><tr>
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<td class="parameter_name"><p>offscreen</p></td>
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<td class="parameter_description"><p>the <a class="link" href="GtkOffscreenWindow.html" title="GtkOffscreenWindow"><span class="type">GtkOffscreenWindow</span></a> contained widget.</p></td>
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<td class="parameter_annotations"> </td>
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</tr></tbody>
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</table></div>
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</div>
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<div class="refsect3">
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<a name="gtk-offscreen-window-get-surface.returns"></a><h4>Returns</h4>
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<p>A <span class="type">cairo_surface_t</span> pointer to the offscreen
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surface, or <code class="literal">NULL</code>. </p>
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<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>
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</div>
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<p class="since">Since: 2.20</p>
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</div>
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<hr>
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<div class="refsect2">
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<a name="gtk-offscreen-window-get-pixbuf"></a><h3>gtk_offscreen_window_get_pixbuf ()</h3>
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<pre class="programlisting"><span class="returnvalue">GdkPixbuf</span> *
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gtk_offscreen_window_get_pixbuf (<em class="parameter"><code><a class="link" href="GtkOffscreenWindow.html" title="GtkOffscreenWindow"><span class="type">GtkOffscreenWindow</span></a> *offscreen</code></em>);</pre>
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<p>Retrieves a snapshot of the contained widget in the form of
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a <span class="type">GdkPixbuf</span>. This is a new pixbuf with a reference count of 1,
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and the application should unreference it once it is no longer
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needed.</p>
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<div class="refsect3">
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<a name="gtk-offscreen-window-get-pixbuf.parameters"></a><h4>Parameters</h4>
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<div class="informaltable"><table class="informaltable" width="100%" border="0">
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<colgroup>
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<col width="150px" class="parameters_name">
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<col class="parameters_description">
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<col width="200px" class="parameters_annotations">
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</colgroup>
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<tbody><tr>
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<td class="parameter_name"><p>offscreen</p></td>
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<td class="parameter_description"><p>the <a class="link" href="GtkOffscreenWindow.html" title="GtkOffscreenWindow"><span class="type">GtkOffscreenWindow</span></a> contained widget.</p></td>
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<td class="parameter_annotations"> </td>
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</tr></tbody>
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</table></div>
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</div>
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<div class="refsect3">
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<a name="gtk-offscreen-window-get-pixbuf.returns"></a><h4>Returns</h4>
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<p>A <span class="type">GdkPixbuf</span> pointer, or <code class="literal">NULL</code>. </p>
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<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="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
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</div>
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<p class="since">Since: 2.20</p>
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</div>
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</div>
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<div class="refsect1">
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<a name="GtkOffscreenWindow.other_details"></a><h2>Types and Values</h2>
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<div class="refsect2">
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<a name="GtkOffscreenWindow-struct"></a><h3>struct GtkOffscreenWindow</h3>
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<pre class="programlisting">struct GtkOffscreenWindow;</pre>
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</div>
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<hr>
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<div class="refsect2">
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<a name="GtkOffscreenWindowClass"></a><h3>struct GtkOffscreenWindowClass</h3>
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<pre class="programlisting">struct GtkOffscreenWindowClass {
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GtkWindowClass parent_class;
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};
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</pre>
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<div class="refsect3">
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<a name="GtkOffscreenWindowClass.members"></a><h4>Members</h4>
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<div class="informaltable"><table class="informaltable" width="100%" border="0">
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<colgroup>
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<col width="300px" class="struct_members_name">
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<col class="struct_members_description">
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<col width="200px" class="struct_members_annotations">
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</colgroup>
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<tbody></tbody>
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</table></div>
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</div>
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</div>
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</div>
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