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view: add view_for_each_reverse() macro

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Consolatis 2024-11-12 20:34:29 +01:00 • committed by Johan Malm
parent da1f28f3dd
commit e274c588c0
2 changed files with 47 additions and 3 deletions
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28
include/view.h
View file

@ -386,6 +386,22 @@ bool view_matches_query(struct view *view, struct view_query *query);
view; \
view = view_next(head, view, criteria))
/**
* for_each_view_reverse() - iterate over all views which match criteria
* @view: Iterator.
* @head: Head of list to iterate over.
* @criteria: Criteria to match against.
* Example:
* struct view *view;
* for_each_view_reverse(view, &server->views, LAB_VIEW_CRITERIA_NONE) {
* printf("%s\n", view_get_string_prop(view, "app_id"));
* }
*/
#define for_each_view_reverse(view, head, criteria) \
for (view = view_prev(head, NULL, criteria); \
view; \
view = view_prev(head, view, criteria))
/**
* view_next() - Get next view which matches criteria.
* @head: Head of list to iterate over.
@ -398,6 +414,18 @@ bool view_matches_query(struct view *view, struct view_query *query);
struct view *view_next(struct wl_list *head, struct view *view,
enum lab_view_criteria criteria);
/**
* view_prev() - Get previous view which matches criteria.
* @head: Head of list to iterate over.
* @view: Current view from which to find the previous one. If NULL is provided
* as the view argument, the end of the list will be used.
* @criteria: Criteria to match against.
*
* Returns NULL if there are no views matching the criteria.
*/
struct view *view_prev(struct wl_list *head, struct view *view,
enum lab_view_criteria criteria);
/*
* Same as `view_next()` except that they iterate one whole cycle rather than
* stopping at the list-head

16
src/view.c
View file

@ -269,6 +269,22 @@ view_next(struct wl_list *head, struct view *view, enum lab_view_criteria criter
return NULL;
}
struct view *
view_prev(struct wl_list *head, struct view *view, enum lab_view_criteria criteria)
{
assert(head);
struct wl_list *elm = view ? &view->link : head;
for (elm = elm->prev; elm != head; elm = elm->prev) {
view = wl_container_of(elm, view, link);
if (matches_criteria(view, criteria)) {
return view;
}
}
return NULL;
}
struct view *
view_next_no_head_stop(struct wl_list *head, struct view *from,
enum lab_view_criteria criteria)