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eeshow/gui-over.c: make list doubly-linked; reverse when dy < 0

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This commit is contained in:
Werner Almesberger 2016-08-15 04:47:43 -03:00
parent 375efa6476
commit b67f6b9a96
1 changed files with 23 additions and 14 deletions
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35
eeshow/gui-over.c
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@ -49,7 +49,7 @@ struct overlay {
struct aoi *aoi; struct aoi *aoi;
struct overlay *next; struct overlay *next, *prev;
}; };
@ -171,12 +171,20 @@ fprintf(stderr, "%u(%d) %u %.60s\n", ty, ink_rect.y / PANGO_SCALE, ink_h, over->
void overlay_draw_all_d(struct overlay *overlays, cairo_t *cr, void overlay_draw_all_d(struct overlay *overlays, cairo_t *cr,
unsigned x, unsigned y, int dx, int dy) unsigned x, unsigned y, int dx, int dy)
{ {
struct overlay *over; struct overlay *over = overlays;
unsigned h; unsigned h;
for (over = overlays; over; over = over->next) { if (dy < 0)
while (over && over->next)
over = over->next;
while (over) {
h = overlay_draw(over, cr, x, y, dx, dy); h = overlay_draw(over, cr, x, y, dx, dy);
y += dy * (h + over->style.skip); y += dy * (h + over->style.skip);
if (dy >= 0)
over = over->next;
else
over = over->prev;
} }
} }
@ -210,7 +218,7 @@ void overlay_draw_all(struct overlay *overlays, cairo_t *cr, int x, int y)
struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois, struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois,
bool (*hover)(void *user, bool on), void (*click)(void *user), void *user) bool (*hover)(void *user, bool on), void (*click)(void *user), void *user)
{ {
struct overlay *over; struct overlay *over, *prev;
struct overlay **anchor; struct overlay **anchor;
over = alloc_type(struct overlay); over = alloc_type(struct overlay);
@ -223,8 +231,11 @@ struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois,
over->user = user; over->user = user;
over->aoi = NULL; over->aoi = NULL;
for (anchor = overlays; *anchor; anchor = &(*anchor)->next); prev = NULL;
for (anchor = overlays; *anchor; anchor = &(*anchor)->next)
prev = *anchor;
over->next = NULL; over->next = NULL;
over->prev = prev;
*anchor = over; *anchor = over;
return over; return over;
@ -272,15 +283,13 @@ static void overlay_free(struct overlay *over)
void overlay_remove(struct overlay **overlays, struct overlay *over) void overlay_remove(struct overlay **overlays, struct overlay *over)
{ {
struct overlay **anchor; if (over->next)
over->next->prev = over->prev;
for (anchor = overlays; *anchor; anchor = &(*anchor)->next) if (over->prev)
if (*anchor == over) { over->prev->next = over->next;
*anchor = over->next; else
*overlays = over->next;
overlay_free(over); overlay_free(over);
return;
}
abort();
} }