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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>Changes in GTK+ 3.20: GTK+ 3 Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GTK+ 3 Reference Manual"> <link rel="up" href="gtk-migrating-3-x-to-y.html" title="Migrating from one GTK+ 3 release to another"> <link rel="prev" href="ch32s09.html" title="Changes in GTK+ 3.18"> <link rel="next" href="ch32s11.html" title="Changes in GTK+ 3.22"> <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"></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="gtk-migrating-3-x-to-y.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="ch32s09.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="ch32s11.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="section"> <div class="titlepage"><div><div><h2 class="title" style="clear: both"> <a name="id-1.6.9.13"></a>Changes in GTK+ 3.20</h2></div></div></div> <p> The way theming works in GTK+ has been reworked fundamentally, to implement many more CSS features and make themes more expressive. As a result, custom CSS that is shipped with applications and third-party themes will need adjustments. Widgets now use element names much more than style classes; type names are no longer used in style matching. Every widget now documents the element names it has and the style classes it uses. The GTK+ inspector can also help with finding this information. </p> <p> GTK+ now uses internal subobjects (also known as gadgets) for allocating and drawing widget parts. Applications that subclass GTK+ widgets may see warnings if they override the size_allocate vfunc and don't chain up. The proper way to subclass is to chain up in size_allocate. If you do not want to do that for some reason, you have to override the draw vfunc as well. </p> <p> Several fixes for window sizing and window placement with client-side decorations may affect applications that are saving and restoring window sizes. The recommended best practice for this which is known to work with client-side and server-side decorations and with older and newer versions of GTK+ is to use <a class="link" href="GtkWindow.html#gtk-window-get-size" title="gtk_window_get_size ()"><code class="function">gtk_window_get_size()</code></a> to save window sizes and <a class="link" href="GtkWindow.html#gtk-window-set-default-size" title="gtk_window_set_default_size ()"><code class="function">gtk_window_set_default_size()</code></a> to restore it. See https://wiki.gnome.org/HowDoI/SaveWindowState for a detailed example. </p> <p> Geometry handling in GtkWindow has been removed. If you are using the functions gtk_window_resize_to_geometry, gtk_window_set_default_geometry, gtk_window_parse_geometry or gtk_window_set_geometry_hints, you may need to make some changes to your code. </p> <p> GtkDrawingArea used to implicitly render the theme background before calling the ::draw handler. This is no longer the case. If you rely on having a theme-provided background, call <a class="link" href="GtkStyleContext.html#gtk-render-background" title="gtk_render_background ()"><code class="function">gtk_render_background()</code></a> from your ::draw handler. </p> <p> The GtkFileChooser interface prerequisite changed from GtkWidget to GObject, allowing non-widget implementations of this interface. This is a minor change in ABI, as applications are no longer guaranteed that a GtkFileChooser also supports all GtkWidget methods. However, all previously existing implementations still derive from GtkWidget, so no existing code should break. </p> <p> The way in which GtkLevelBar determines the offset to apply was a bit inconsistent in the past; this has been fixed. Applications that are using custom offsets should double-check that their levels look as expected. </p> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>