80 lines
4.7 KiB
HTML
80 lines
4.7 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Changes in GTK+ 3.20: GTK+ 3 Reference Manual</title>
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<meta name="generator" content="DocBook XSL Stylesheets Vsnapshot">
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<link rel="home" href="index.html" title="GTK+ 3 Reference Manual">
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<link rel="up" href="gtk-migrating-3-x-to-y.html" title="Migrating from one GTK+ 3 release to another">
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<link rel="prev" href="ch32s09.html" title="Changes in GTK+ 3.18">
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<link rel="next" href="ch32s11.html" title="Changes in GTK+ 3.22">
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<meta name="generator" content="GTK-Doc V1.29 (XML mode)">
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<link rel="stylesheet" href="style.css" type="text/css">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
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<td width="100%" align="left" class="shortcuts"></td>
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<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
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<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>
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<td><a accesskey="p" href="ch32s09.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
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<td><a accesskey="n" href="ch32s11.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
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</tr></table>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="id-1.6.9.13"></a>Changes in GTK+ 3.20</h2></div></div></div>
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<p>
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The way theming works in GTK+ has been reworked fundamentally, to
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implement many more CSS features and make themes more expressive.
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As a result, custom CSS that is shipped with applications and third-party
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themes will need adjustments. Widgets now use element names much more
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than style classes; type names are no longer used in style matching.
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Every widget now documents the element names it has and the style classes
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it uses. The GTK+ inspector can also help with finding this information.
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</p>
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<p>
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GTK+ now uses internal subobjects (also known as gadgets) for allocating
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and drawing widget parts. Applications that subclass GTK+ widgets may see
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warnings if they override the size_allocate vfunc and don't chain up.
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The proper way to subclass is to chain up in size_allocate. If you do not
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want to do that for some reason, you have to override the draw vfunc as
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well.
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</p>
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<p>
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Several fixes for window sizing and window placement with client-side
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decorations may affect applications that are saving and restoring window
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sizes. The recommended best practice for this which is known to work with
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client-side and server-side decorations and with older and newer versions
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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
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<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.
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See https://wiki.gnome.org/HowDoI/SaveWindowState for a detailed example.
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</p>
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<p>
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Geometry handling in GtkWindow has been removed. If you are using the
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functions gtk_window_resize_to_geometry, gtk_window_set_default_geometry,
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gtk_window_parse_geometry or gtk_window_set_geometry_hints, you may need
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to make some changes to your code.
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</p>
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<p>
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GtkDrawingArea used to implicitly render the theme background before
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calling the ::draw handler. This is no longer the case. If you rely
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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>
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from your ::draw handler.
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</p>
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<p>
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The GtkFileChooser interface prerequisite changed from GtkWidget
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to GObject, allowing non-widget implementations of this interface.
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This is a minor change in ABI, as applications are no longer guaranteed
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that a GtkFileChooser also supports all GtkWidget methods. However, all
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previously existing implementations still derive from GtkWidget, so no
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existing code should break.
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</p>
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<p>
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The way in which GtkLevelBar determines the offset to apply was a bit
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inconsistent in the past; this has been fixed. Applications that are using
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custom offsets should double-check that their levels look as expected.
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</p>
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</div>
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<div class="footer">
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<hr>Generated by GTK-Doc V1.29</div>
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</body>
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</html> |