We can avoid recreating a number of text nodes from render_para() on
sub-sequent runs if we cache the rendernode instead of just the
PangoLayout.
When used with GtkSourceMap, this can yield a ~7 FPS improvement during
smooth scrolling at the cost of some more memory.
This creates a new GtkTextViewChild that can manage overlay children at
given x,y offsets in buffer coordinates. This simplifies GtkTextView by
extracting this from GtkTextWindow as well as providing a real widget for
the borders.
With this change, we also rename gtk_text_view_add_child_in_window() to
gtk_text_view_add_overlay(). For those that were using
GTK_TEXT_WINDOW_WIDGET, they can use a GtkOverlay. It does not appear
that anyone was using GTK_TEXT_WINDOW_(LEFT|RIGHT|TOP|BOTTOM) for widgets
in this fashion, but that can be done by setting a gutter widget with
gtk_text_view_set_gutter(). We can make GtkTextViewChild public if
necessary to simplify this should it become necessary.
GtkTextViewChild will setup a CSS node of either "text" or "border"
depending on the GtkTextWindowType.
The old GtkTextViewChild has been renamed to AnchoredChild as it is only
used for widgets with anchors in the GtkTextBuffer. This also removes the
use of allocated GSList and instead embeds a GQueue and GList to save a
few extraneous allocations.
The renaming of this function doesn't make much since because the window
is the GtkTextWindowType, not GdkWindow specifically. So we can keep the
old name which is closer to the proper meaning and less code for consumers
to change when porting to 4.x.
It’s possible for code which uses a `GtkListBox` to reuse a single
header row, and move it around between rows. For example, this might
happen if the code has interactive widgets (like buttons) in the row,
and doesn’t want to continually recreate them and reattach signals to
them whenever the row headers change.
Unfortunately, this was broken, as the old header widget was
unconditionally unparented, even if it had just been set as the header
for a different row in the same `GtkListBox`. This left it assigned as
a child widget in the `GtkListBox` (so it was iterated over by
`forall`), but without its parent widget set.
Fix that by only unparenting the header if it hasn’t already been
assigned as the parent of a different row.
Signed-off-by: Philip Withnall <withnall@endlessm.com>
G_ENABLE_DEBUG is tied to the meson builttype property, so building with "plain"
results in G_ENABLE_DEBUG not being defined and the GTK_DEBUG env var just gets ignored
for that build.
Since it can be confusing that GTK_DEBUG has no effect print a warning message instead.
See #2020. This is a port of !1109 to master
While the ::scroll signal always returns whether it handled the event,
the others do not, for example ::decelerate.
Previously, this caused the event to stop at a scroll controller with
CAPTURE phase, never emitting the ::decelerate signal on later
controllers with BUBBLE phase.
Fixes#2151
