This uses the new push()/pop() mechanism to its fullest extent when
implementing transitions. It's fun to inspect the results in the
inspector.
Crossfades don't work yet, they continue using a Cairo fallback.
A side effect of the stack conversion is that widget-factory now uses
snapshots for a lot more things.
Unlike other container widgets, GtkStack would allocate its children
prior to moving its windows, which might prevent further valid size
allocation signals to be emitted.
Re-order the size allocation of child widgets to be performed after
moving the GtkStack windows.
Thanks to Owen for spotting the real issue here.
https://bugzilla.gnome.org/show_bug.cgi?id=767713
In that case, we can't just rely on the stack allocation being big
enough. Especially, the child can actually be bigger than the current
stack allocation, so take that into account when positioning it.
Add a new ::measure vfunc similar to GtkCssGadget's that widget
implementations have to override instead of the old get_preferred_width,
get_preferred_height, get_preferred_width_for_height,
get_preferred_height_for_width and
get_preferred_height_and_baseline_for_width.
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.
gtk_widget_set_parent() will map the widget if the parent is mapped
and the widget is both visible and child-visible. As we currently
only set the child visibility after adding the child, we immediately
map all children that are added to a mapped stack, even when they
are not actually shown. Avoid this by setting the child visibility
before adding the child, so widgets are only mapped when shown.
https://bugzilla.gnome.org/show_bug.cgi?id=766737
Sometimes on wayland we're seeing a frame draw before the first tick
callback, where the window position has not yet been updated.
With this change, the window is properly positioned as soon as
gtk_stack_start_transition returns.
https://bugzilla.gnome.org/show_bug.cgi?id=766405
Not the ideal solution for this problem, but in practice leads to
much better performance on lower end hardware.
Stack does a double draw on the first frame of its animation, of
both the old contents (into a cairo surface) and the new contents.
Homogeneous stacks only need to reallocate contents on the first
frame.
On lower powered hardware where our frames will be a good deal
slower than the refresh rate anyway, we can assure a smother
experience by waiting a frame to start tweening where frame duration
will be more consistent.
When animating, we might be changing the size allocation of the previous
stack child. However, we were not querying the size in the process
meaning you would often see warnings about allocating the size without
knowing what it should be.
This simply adds an innocuous size request, since responding to last_child
sizing requests is not all that critical in the transition.
https://bugzilla.gnome.org/show_bug.cgi?id=763900
Always have Since: annotations at the very bottom, use the correct
ClassName::signal-name/ClassName:property-name syntax, fix a few typos
in type names, wrong function names, non-existing type names, etc.
Doing things the other way around seems to cause problems in
some cases where children want to do different things depending
on the window position.
https://bugzilla.gnome.org/show_bug.cgi?id=758563
Currently GtkStack has some G_PARAM_CONSTRUCT properties. That means,
the properties are set with its default value after the initializacion
of the object.
When using GtkBuilder to build objects, GtkBuilder creates them and
after that sets the properties found on the xml definition.
However, this is not true for templates because the template is initialized
in the init() function of the actual object, and after that, the construct
properties will be set.
This is a problem when someone wants to use templates with GtkStack and
set those properties, since they will be set on the tempalt initialization
and set again to its default values afterwards.
To fix this, make those properties not G_PARAM_CONSTRUCT.
https://bugzilla.gnome.org/show_bug.cgi?id=758086
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
This adds new 'over' and 'under' transitions which work by moving
the new page over the previous one, or moving the previous page off
to reveal the new one. We also add an over/under combination that
is going to be used in GtkAboutDialog.
https://bugzilla.gnome.org/show_bug.cgi?id=707187
The child property is watched by the StackSwicther which in turns sets a
needs-attention css class on the corresponding button, so that the theme
can for instance show a throbbing animation if one of the hidden pages
needs the user attention.
https://bugzilla.gnome.org/show_bug.cgi?id=707153
Since we now do all drawing propagation on the cairo_t (rather than
exposing multiple independent times on the GdkWindows) we no longer
need the opacity 0.999 hack.
We should only draw the cross-fade on the bin window, not doing this
was causing us to draw it multiple times using ADD which resulted
in weird colors.
Add separate GtkStack and GtkStackSwitcher widgets that are an
alternative to GtkNotebook. Additionally, GtkStack supports
animated transitions when changing pages.
These widgets were initially developed in libgd.
