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Beef up the migration guide

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Matthias Clasen 2016-10-20 16:09:45 -04:00
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docs/reference/gtk/migrating-3to4.xml
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@ -51,6 +51,77 @@
trigger warnings.
</para>
</section>
<section>
<title>Review your window creation flags</title>
<para>
GTK+ 4 removes the GDK_WA_CURSOR flag. Instead, just use
gdk_window_set_cursor() to set a cursor on the window after
creating it.
</para>
<para>
GTK+ 4 also removes the GDK_WA_VISUAL flag, and always uses
an RGBA visual for windows. To prepare your code for this,
use gdk_window_set_visual (gdk_screen_get_rgba_visual ()) after
creating your window.
</para>
<para>
GTK+ 4 also removes the GDK_WA_WMCLASS flag. If you need this
X11-specific functionality, use XSetClassHint() directly.
</para>
</section>
<section>
<title>Stop using non-RGBA visuals</title>
<para>
GTK+ 4 always uses RGBA visuals for its windows; you should make
sure that your code works with that.
</para>
</section>
<section>
<title>Stop using GtkBox::padding</title>
<para>
GTK+ 4 removes the #GtkBox::padding child property, so you should
use other ways to influence the layout of your boxes.
</para>
</section>
<section>
<title>Stop using the state argument of GtkStyleContext getters</title>
<para>
The getters in the GtkStyleContext API, such as
gtk_style_context_get_property(), gtk_style_context_get(),
or gtk_style_context_get_color() only accept the context's current
state for their state argument. Update all callers to pass the current
state.
</para>
</section>
</section>
<section>
<title>Changes that need to be done at the time of the switch</title>
<para>
This section outlines porting tasks that you need to tackle when
you get to the point that you actually build your application against
GTK+ 4. Making it possible to prepare for these in GTK+ 3 would
have been either impossible or impractical.
</para>
<section>
<title>Adapt to GtkStyleContext API changes</title>
<para>
The getters in the GtkStyleContext API, such as
gtk_style_context_get_property(), gtk_style_context_get(),
or gtk_style_context_get_color() have lost their state argument,
and always use the context's current state. Update all callers
to omit the state argument.
</para>
</section>
</section>
</chapter>