This is in preparation of using input streams to show that these
coordinates aren't needed most of the time and can otherwise be saved
during GtkWidget::drag-drop.
Instead of allowing people to pass a uint user-data, insist on them
comparing mime types.
The user data was a uint instead of a pointer anyway, so uniqueness
could not be guaranteed and it caused more issues than it was worth.
And that's ignoring the fact that it basically wasn't used.
This patch makes that work using 1 of 2 options:
1. Add all missing enums to the switch statement
or
2. Cast the switch argument to a uint to avoid having to do that (mostly
for GdkEventType).
I even found a bug while doing that: clearing a GtkImage with a surface
did not notify thae surface property.
The reason for enabling this flag even though it is tedious at times is
that it is very useful when adding values to an enum, because it makes
GTK immediately warn about all the switch statements where this enum is
relevant.
And I expect changes to enums to be frequent during the GTK4 development
cycle.
This function clearly assumes the parameter children cannot be NULL, and
the call sites seem to perform enough checks to confirm this.
CID 1388869 (#1 of 1): Dereference before null check (REVERSE_INULL)
check_after_deref: Null-checking children suggests that it may be null,
but it has already been dereferenced on all paths leading to the check.
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.
always initialize clips to the (content) allocation, don't walk up the
widget hierarchy in gtk_widget_set_clip, implement
gtk_widget_size_allocate in GtkSeparator. This way we don't end up using
uninitialized clip values.
The entire clip handling is up for major rework since we can't and don't
want to force every single widget to call _set_clip in size-allocate
implementations.
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.
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.
Before commit 6c1bee2377 we were setting an attribute of GtkNotebook
to track the pressed button if the pressed button happened on the
tab itself.
Later in the motion handling code we were checking whether the private
pressed button attribute was set or not in order to handle a tab dnd
or not.
In commit 6c1bee2377 the code changed and set the pressed button
variable unconditionally, which means, a motion event from within the
tab content triggered a tab reordering.
This happened only if the children hierarchy have a widget that bubbles
up both button press event, which sets the private pressed button
attribute; and motion events, which started the tab dnd checking the
private pressed button attribute.
A widget that experienced the regression was GtkListBox.
In order to fix it, set the button pressed variable only when it press
the tab itself, not the content.
https://bugzilla.gnome.org/show_bug.cgi?id=764395
We only keep one align flag per child, so it seems odd to
keep separate h/v expand flags. Just keep one expand flag
and interpret it according to orientation. Allow setting
the expand flag for child widgets too, though, so we can
make widget expand without interfering with the recursive
widget expand flag.
Update all callers.
Use the new possibility of expanding child widgets to make
the label of check and radio buttons expand. This fixes
unexpected behavior of these widgets in RTL in some places.
https://bugzilla.gnome.org/show_bug.cgi?id=765742
Besides the ::drag-failed handling in order to trigger the window creation
hook, add some handling of the application/x-rootwindow-drop mimetype, so
the same effect is achieved if the tab could be dropped in a destination
accepting this mimetype.
https://bugzilla.gnome.org/show_bug.cgi?id=763387
This is necessary for GtkNotebook so that the stack is always drawn
before the header.
And that is necessary so that the active tab can use negative
margins to overdraw the border of the stack to create a gap and
simulate old GTK2-style visuals for notebooks.
:active is reserved for "mouse button down on node", so we have to use
something else. And stack switcher and radio buttons use :checked for
the active widget, so it makes sense to use :checked for the active tab,
too.
Themes have been adapted.
TODO: Implement :active for tabs.
Sometimes default tab labels ("Page <n>") get created on-demand,
and in that case, we were forgetting to put them below the tab
node in the CSS node tree. The visible result of this is that the
heuristics for when to give notebooks background in Adwaita fail
in some cases. So, make sure to always place the label below the
tab node.
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.
Button state was being kept in two separate variables, which lead
to slight confusions in DnD that caused the notebook to ignore the
first click after DnD happened from (within) it. Unify these two
into one, which helps us keep better track of the really pressed
buttons.
Move code to properly reinsert the tab label to where it belongs.
The if has the distinction between reparented-to-dnd-window and
just-changed-the-gdk-window-to-draw-to right there.
https://bugzilla.gnome.org/show_bug.cgi?id=760754
Use gtk_box_gadget_reverse_children and gtk_css_node_reverse_children
to flip the children of the header_gadget and the tabs_gadget when
appropriate.
Add new CSS node tests to verify that the node order is updated
as expected in all cases.
So far, the box gadget is always allocating all children the
full size in the cross axis. This behavior corresponds to the
align-items: stretch behavior in
https://www.w3.org/TR/css-flexbox-1/#align-items-property
This commit implements the other modes described there.
While widgets have halign/valign properties that we can use for
this, the API for inserting gadgets has to change to take an
extra align parameter. All callers have been updated to pass
GTK_ALIGN_FILL, since that corresponds to the previous behavior.
https://bugzilla.gnome.org/show_bug.cgi?id=760668
When a tab drag starts, we need to move the tab label into the drag
window via gtk_widget_set_parent_window().
If we don't unparent, but just unrealize the widget, we don't lose the
cssnode position.
GtkNotebook does not switch the current page if all pages are hidden. So
it may be that no visible page exsits, but there still is a current
page set.
We culd clear the current page, but I'm unsure about backwards
compatibility.
So instead, this new function handles that case.
This allows reworking the content node to do real height-for-width.
The content node also takes care of border width, but we might want to
have the toplevel do it or just get rid of it.
Deprecate initial-gap, tab-curvature and tab-overlap properties. All
their features can be achieved using CSS.
This CSS achieves the same effect as a 10px initial gap:
notebook header {
margin-left: 10px;
margin-right: 10px;
}
A tab overlap of 10px can be achieved via:
notebook tabs {
margin-left: 10px;
}
notebook tab {
margin-left: -10px;
}
And tab curvature is essentially the same as padding or border on a tab.
Instead of having old and new style, now have a GtkCssStyleChange opaque
object that will compute the changes you are interested in for you.
This simplifies change signal handlers quite a bit and avoids lots of
repeated computation in every signal handler.
Otherwise rounding errors fool the "tab under coordinates" checks on
crossing events, which will be triggered close enough to the window
rectangle if the pointer moves slowly enough.
With this, the tab_prelight() function correctly figures out we've
moved the pointer outside the tab area when called in
gtk_notebook_leave_notify().
https://bugzilla.gnome.org/show_bug.cgi?id=759091
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.
The drag destination might be empty, we shouldn't be checking whether
it contains pages at all. Instead, check the source notebook, which
ought to have a selected page if you're dragging something from there.
https://bugzilla.gnome.org/show_bug.cgi?id=749893
This causes pixman warnings, or worse.
Clearly, something is not quite right here, if we end up
redrawing tabs at a time when the allocation is set to (1, 1).
For now, avoid straining the error handling in the lower layers.
https://bugzilla.gnome.org/show_bug.cgi?id=746301
This is necessary to avoid unwanted drag cancel animations,
now that GtkNotebook is careful about cancelling a drag
when the dragged tab disappears unexpectedly.
When a tab is dropped, we have to remove it from the notebook to
insert it elsewhere. This is expected part of the tab dnd operation,
and we need to differentiate it from 'spontaneous' removals which
cause us to cancel the drag operation.
when the dragged tab is being removed during the drag operation,
we need to cancel the drag. To do so, we have to keep around
a reference to the drag context.
This should fix
https://bugzilla.gnome.org/show_bug.cgi?id=732051
Regions are done in a very non-css way. They don't fit the DOM in that
they don't integrate into the CSS tree and they have very weird matching
behavior in selectors.
So I'm deprecating them now. GtkNotebook and GtkTreeview will continue
to use them and as long as they do, we can't remove the code for it.
But once those are ported it might be safe to remove the code as it will
clean up lots of places in the code by quite a bit.
The extra condition here that caused the current child to
not redraw during reordering was introduced in f383e1f1
during the port to ::draw, but was not explained in the
commit message, and removing it has no obvious negative
effect.
https://bugzilla.gnome.org/show_bug.cgi?id=730767
Try to do a better job of keeping example content
from being too wide. It is often rendered as <pre>
text so the only time we can wrap it is in the source.
It is best to full break lines at all punctuation and
to try to keep the width under 70 chars or so.
