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| author | Leo Tenenbaum <pommicket@gmail.com> | 2018-08-20 21:12:06 -0400 |
|---|---|---|
| committer | Leo Tenenbaum <pommicket@gmail.com> | 2018-08-20 21:12:06 -0400 |
| commit | 63e87c2d0c9d263f14c77b68f85c67d46ece82a9 (patch) | |
| tree | 6260365cbf7d24f37d27669e8538227fcb72e243 /gtk+-mingw/share/gtk-doc/html/gobject/howto-interface-override.html | |
| parent | a4460f6d9453bbd7e584937686449cef3e19f052 (diff) | |
Diffstat (limited to 'gtk+-mingw/share/gtk-doc/html/gobject/howto-interface-override.html')
| -rw-r--r-- | gtk+-mingw/share/gtk-doc/html/gobject/howto-interface-override.html | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/gtk+-mingw/share/gtk-doc/html/gobject/howto-interface-override.html b/gtk+-mingw/share/gtk-doc/html/gobject/howto-interface-override.html deleted file mode 100644 index 879cb71..0000000 --- a/gtk+-mingw/share/gtk-doc/html/gobject/howto-interface-override.html +++ /dev/null @@ -1,135 +0,0 @@ -<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> -<html> -<head> -<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> -<title>Overriding interface methods</title> -<meta name="generator" content="DocBook XSL Stylesheets V1.76.1"> -<link rel="home" href="index.html" title="GObject Reference Manual"> -<link rel="up" href="howto-interface.html" title="How to define and implement interfaces"> -<link rel="prev" href="howto-interface-properties.html" title="Interface properties"> -<link rel="next" href="howto-signals.html" title="How to create and use signals"> -<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="howto-interface-properties.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td> -<td><a accesskey="u" href="howto-interface.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">GObject Reference Manual</th> -<td><a accesskey="n" href="howto-signals.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td> -</tr></table> -<div class="sect1"> -<div class="titlepage"><div><div><h2 class="title" style="clear: both"> -<a name="howto-interface-override"></a>Overriding interface methods</h2></div></div></div> -<p> - If a base class already implements an interface, and in a derived - class you wish to implement the same interface overriding only certain - methods of that interface, you just reimplement the interface and - set only the interface methods you wish to override. - </p> -<p> - In this example MamanDerivedBaz is derived from MamanBaz. Both - implement the MamanIbaz interface. MamanDerivedBaz only implements one - method of the MamanIbaz interface and uses the base class implementation - of the other. -</p> -<pre class="programlisting"> -static void -maman_derived_ibaz_do_action (MamanIbaz *ibaz) -{ - MamanDerivedBaz *self = MAMAN_DERIVED_BAZ (ibaz); - g_print ("DerivedBaz implementation of Ibaz interface Action\n"); -} - -static void -maman_derived_ibaz_interface_init (MamanIbazInterface *iface) -{ - /* Override the implementation of do_action */ - iface->do_action = maman_derived_ibaz_do_action; - - /* - * We simply leave iface->do_something alone, it is already set to the - * base class implementation. - */ -} - -G_DEFINE_TYPE_WITH_CODE (MamanDerivedBaz, maman_derived_baz, MAMAN_TYPE_BAZ, - G_IMPLEMENT_INTERFACE (MAMAN_TYPE_IBAZ, - maman_derived_ibaz_interface_init) - -static void -maman_derived_baz_class_init (MamanDerivedBazClass *klass) -{ - -} - -static void -maman_derived_baz_init (MamanDerivedBaz *self) -{ - -} -</pre> -<p> - </p> -<p> - To access the base class interface implementation use - <code class="function"><a class="link" href="gobject-Type-Information.html#g-type-interface-peek-parent" title="g_type_interface_peek_parent ()">g_type_interface_peek_parent</a></code> - from within an interface's <code class="function">default_init</code> function. - </p> -<p> - If you wish to call the base class implementation of an interface - method from an derived class where than interface method has been - overridden then you can stash away the pointer returned from - <code class="function"><a class="link" href="gobject-Type-Information.html#g-type-interface-peek-parent" title="g_type_interface_peek_parent ()">g_type_interface_peek_parent</a></code> - in a global variable. - </p> -<p> - In this example MamanDerivedBaz overides the - <code class="function">do_action</code> interface method. In it's overridden method - it calls the base class implementation of the same interface method. -</p> -<pre class="programlisting"> -static MamanIbazInterface *maman_ibaz_parent_interface = NULL; - -static void -maman_derived_ibaz_do_action (MamanIbaz *ibaz) -{ - MamanDerivedBaz *self = MAMAN_DERIVED_BAZ (ibaz); - g_print ("DerivedBaz implementation of Ibaz interface Action\n"); - - /* Now we call the base implementation */ - maman_ibaz_parent_interface->do_action (ibaz); -} - -static void -maman_derived_ibaz_interface_init (MamanIbazInterface *iface) -{ - maman_ibaz_parent_interface = g_type_interface_peek_parent (iface); - iface->do_action = maman_derived_ibaz_do_action; -} - -G_DEFINE_TYPE_WITH_CODE (MamanDerivedBaz, maman_derived_baz, MAMAN_TYPE_BAZ, - G_IMPLEMENT_INTERFACE (MAMAN_TYPE_IBAZ, - maman_derived_ibaz_interface_init) - -static void -maman_derived_baz_class_init (MamanDerivedBazClass *klass) -{ - -} - -static void -maman_derived_baz_init (MamanDerivedBaz *self) -{ - -} -</pre> -<p> - </p> -</div> -<div class="footer"> -<hr> - Generated by GTK-Doc V1.18</div> -</body> -</html>
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