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Add a "ref and sink" question. (#156865, Philip Langdale, text based on a

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2004-11-01  Matthias Clasen  <mclasen@redhat.com>

	* gtk/question_index.sgml: Add a "ref and sink" question.
	(#156865, Philip Langdale, text based on a comment by Owen
	Taylor)

	* gtk/tmpl/gtkrc.sgml: Document im_module_file and settings
	assignments as toplevel statements.
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Matthias Clasen 2004-11-01 19:19:06 +00:00 committed by Matthias Clasen
parent 9c0c928802
commit 69b1611e59
3 changed files with 50 additions and 4 deletions
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6
docs/reference/ChangeLog
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@ -4,9 +4,13 @@ Mon Nov 1 13:37:31 2004 Jonathan Blandford <jrb@redhat.com>
2004-11-01 Matthias Clasen <mclasen@redhat.com>
* gtk/question_index.sgml: Add a "ref and sink" question.
(#156865, Philip Langdale, text based on a comment by Owen
Taylor)
* gtk/tmpl/gtkrc.sgml: Document im_module_file and settings
assignments as toplevel statements.
2004-10-31 Matthias Clasen <mclasen@redhat.com>
* gtk/windows.sgml: s/PRETEND_WIN9X/G_WIN32_PRETEND_WIN9X/.

46
docs/reference/gtk/question_index.sgml
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@ -116,9 +116,51 @@ url="http://bugzilla.gnome.org">http://bugzilla.gnome.org</ulink>.)
</para>
</answer>
</qandaentry>
<qandaentry>
<question>
<para>
Why does my program leak memory, if I destroy a widget immediately
after creating it ?
</para>
</question>
<answer>
<para>
If <structname>GtkFoo</structname> isn't a toplevel window, then
<informalexample><programlisting>
foo = gtk_foo_new (<!-- -->);
gtk_widget_destroy (foo);
</programlisting></informalexample>
is a memory leak, because no one assumed the initial floating
reference. If you are using a widget and you aren't immediately
packing it into a container, then you probably want standard
reference counting, not floating reference counting.
</para>
<para>
To to get this, you must acquire a reference to the widget and drop the floating
reference (<quote>ref and sink</quote> in GTK+ parlance) after creating it:
<informalexample><programlisting>
foo = gtk_foo_new (<!-- -->);
g_object_ref (foo);
gtk_object_sink (GTK_OBJECT (foo));
</programlisting></informalexample>
When you want to get rid of the widget, you must call gtk_widget_destroy()
to break any external connections to the widget before dropping your
reference:
<informalexample><programlisting>
gtk_widget_destroy (foo);
g_object_unref (foo);
</programlisting></informalexample>
When you immediately add a widget to a container, it takes care of
assuming the initial floating reference and you don't have to worry
about reference counting at all ... just call gtk_widget_destroy()
to get rid of the widget.
</para>
</answer>
</qandaentry>
<qandaentry>
<question><para>
@ -483,7 +525,7 @@ to the GNOME 2.0 platform</ulink>.
<qandaentry>
<question>
<para>
Why are types not registered if I use their <literal>GTK_TYPE_BLAH;</literal> macro ?
Why are types not registered if I use their <literal>GTK_TYPE_BLAH</literal> macro ?
</para>
</question>

2
docs/reference/gtk/tmpl/gtkrc.sgml
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@ -219,7 +219,7 @@ The possible toplevel declarations are:
</varlistentry>
<varlistentry>
<term><replaceable>setting</replaceable> = <replaceable>value<replaceable></literal></term>
<term><replaceable>setting</replaceable> = <replaceable>value</replaceable></term>
<listitem>
<para>Specifies a value for a <link linkend="GtkSettings">setting</link>. Note that
settings in RC files are overwritten by system-wide settings which are managed by