Since gtk_bin_add does a gtk_widget_set_parent call, we cannot use it in
a GtkBin implementation that has multiple child widgets and cares about
their order.
Since setting a clip is mandatory for almost all widgets, we can as well
change the size-allocate signature to include a out_clip parameter, just
like GtkCssGadget did. And since we now always propagate baselines, we
might as well pass that one on to size-allocate.
This way we can also make sure to transform the clip returned from
size-allocate to parent-coordinates, i.e. the same coordinate space
priv->allocation is in.
We now rely on toplevels receiving and forwarding all the events
the windowing should be able to handle. Event masks are no longer a
way to determine whether an event is deliverable ot a widget.
Events will always be delivered in the three captured/target/bubbled
phases, widgets can now just attach GtkEventControllers and let those
handle the events.
And with it, gtk_widget_get_visual() and gtk_widget_set_visual() are
gone.
We now always use the RGBA visual (if available) and otherwise fall back
to the system visual.
These days exposure happens only on the native windows (generally the
toplevel window) and is propagated down recursively. The expose event
is only useful for backwards compat, and in fact, for double buffered
widgets we totally ignore the event (and non-double buffering breaks
on wayland).
So, by not setting the mask we avoid emitting these events and then
later ignoring them.
We still keep it on eventbox, fixed and layout as these are used
in weird ways that want backwards compat.
State that the overlays are placed wrt to the GtkOverlay, not
with respect to the main widget. This makes a difference for
small main widgets which are not configured to fill the entire
GtkOverlay.
Just pretend that the main widget is an empty widget the size of the
overlay.
Makes it possible to write testcases where no size requests are run on
overlay widgets before size_allocate() is called.
Testcase included.
It can happen that we get a size request when the main widget
is still NULL. Currently we hit a critical in this case, and
stumble on. We can do better.
Opening a new tab in nautilus is hitting this case.
https://bugzilla.gnome.org/show_bug.cgi?id=727643
We were calling gtk_overlay_child_allocate() both in realize
and in add as we wanted to create and position the child windows
for the widgets. However, this call also actually called
gtk_widget_size_allocate() on the child, which it shouldn't. In some
cases the overlay is realized before being allocated, and thus it
will allocate the child at 0x0 which is an invalid size for it to be in.
In particular, if the child has margins set this will result in negative
allocations and warnings.
This fix splits out the allocation computation so that
gtk_overlay_create_child_window can use it without callers
having to call gtk_overlay_child_allocate() to move the windows.
https://bugzilla.gnome.org/show_bug.cgi?id=696623
