We only allocate a size to the currently visible child, so we obviously
need to rerun allocation when the visible child changes.
In the case where the stack is not homogenous, we also need to queue a
resize because our size request just changed.
It looks like the param spec for interpolate-size was
copied from the line above it, which is a read only property.
There is a setter for interpolate-size, and it is implemented in
set_property().
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.
When the stack is destroyed we do not want to waste time running
animations and notifying listeners about which is our current
visible child.
This is not only an optimization, but it is important for the stack
switcher widgets: since they are in another branch of the hieratchy
we do not want to get notifications while the stack is being destroyed.
Based on a patch by Paolo Borelli
https://bugzilla.gnome.org/show_bug.cgi?id=724506
When interpolating the stack size, we compute the current size by using
the prefered/minimum current size and the last size. We can't use the
last_visible_surface_allocation because that is not available until the
first _draw call and it doesn't include the child's margins.
Add notebook-like focus handling: Keep track of the last focused
descendent of each page, and focus it again when switching back
to the page. If there is no last focused child, we move the focus
into the page as if the user had hit Tab.
If a child has set_has_window == FALSE, it purely relies on the events set on
the parent window, for which the bin window used to just ensure the exposure
mask, eating all input events.
https://bugzilla.gnome.org/show_bug.cgi?id=734357
This small refactor makes the code more readable when adding more
transition types that have left, right, up, and down variations.
It adds inline boolean functions to tell information about transition
types (avoiding long if clauses) and changes long chains of "else if
(transition_type == ...)" into switch statements. Both are only likely
to get longer as more transition types are added.
https://bugzilla.gnome.org/show_bug.cgi?id=726676
This new method allows getting a widget from a GtkStack when we know its
name, and will also return NULL if there is no widget going by that
name.
Usage example would be to check if a child with a given name exists
before calling gtk_stack_set_visible_child_name().
https://bugzilla.gnome.org/show_bug.cgi?id=722588
