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Add some drawing information the migration guide

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Mention snapshot(), and the new GtkDrawingArea API.
This commit is contained in:
Matthias Clasen 2016-11-18 07:42:49 -05:00
parent 3c5dbc2f17
commit 9ecb34b4a0
1 changed files with 21 additions and 0 deletions
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docs/reference/gtk/migrating-3to4.xml
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@ -149,6 +149,27 @@
</para>
</section>
<section>
<title>Adapt to drawing model changes</title>
<para>
This area has seen the most radical changes in the transition from GTK+ 3
to GTK+ 4. Widgets no longer use a draw() function to render their contents
to a cairo surface. Instead, they have a snapshot() function that creates
one or more GskRenderNodes to represent their content. Third-party widgets
that use a draw() function or a #GtkWidget::draw signal handler for custom
drawing will need to be converted to use gtk_snapshot_append_cairo_node().
</para>
<para>
The auxiliary #GtkSnapshot object has APIs to help with creating render
nodes.
</para>
<para>
If you are using a #GtkDrawingArea for custom drawing, you need to switch
to using gtk_drawing_area_set_draw_func() to set a draw function. This is
pretty much a direct replacement for a #GtkWidget::draw signal handler.
</para>
</section>
</section>
</chapter>