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compositor: do sync actor stack in one pass

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This refactor will simplify a subsequent commit that
introduces more than one background actor to the window
group.

https://bugzilla.gnome.org/show_bug.cgi?id=682427
This commit is contained in:
Ray Strode 2013-02-13 23:10:33 -05:00
parent 112ef93e19
commit aba87407e9
1 changed files with 20 additions and 26 deletions
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46
src/compositor/compositor.c
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@ -1063,8 +1063,10 @@ static void
sync_actor_stacking (MetaCompScreen *info)
{
GList *children;
GList *expected_window_node;
GList *tmp;
GList *old;
gboolean has_windows;
gboolean reordered;
/* NB: The first entries in the lists are stacked the lowest */
@ -1076,49 +1078,41 @@ sync_actor_stacking (MetaCompScreen *info)
children = clutter_container_get_children (CLUTTER_CONTAINER (info->window_group));
reordered = FALSE;
old = children;
/* We allow for actors in the window group other than the actors we
* know about, but it's up to a plugin to try and keep them stacked correctly
* (we really need extra API to make that reliable.)
*/
/* Of the actors we know, the bottom actor should be the background actor */
while (old && old->data != info->background_actor && !META_IS_WINDOW_ACTOR (old->data))
old = old->next;
if (old == NULL || old->data != info->background_actor)
/* First we check if the background is at the bottom. Then
* we check if the window actors are in the correct sequence */
expected_window_node = info->windows;
for (old = children; old != NULL; old = old->next)
{
reordered = TRUE;
goto done_with_check;
}
ClutterActor *actor = old->data;
/* Then the window actors should follow in sequence */
old = old->next;
for (tmp = info->windows; tmp != NULL; tmp = tmp->next)
{
while (old && !META_IS_WINDOW_ACTOR (old->data))
old = old->next;
/* old == NULL: someone reparented a window out of the window group,
* order undefined, always restack */
if (old == NULL || old->data != tmp->data)
if (actor == info->background_actor)
{
reordered = TRUE;
goto done_with_check;
if (has_windows)
reordered = TRUE;
}
else if (META_IS_WINDOW_ACTOR (actor) && !reordered)
{
has_windows = TRUE;
old = old->next;
if (expected_window_node != NULL && actor == expected_window_node->data)
expected_window_node = expected_window_node->next;
else
reordered = TRUE;
}
}
done_with_check:
g_list_free (children);
if (!reordered)
return;
/* reorder the actors by lowering them in turn to the bottom of the stack.
* windows first, then background */
for (tmp = g_list_last (info->windows); tmp != NULL; tmp = tmp->prev)
{
MetaWindowActor *window_actor = tmp->data;