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New util function: BLI_listbases_swaplinks

This commit is contained in:
Dalai Felinto 2017-03-08 20:55:42 +01:00
parent a42a0b5ef3
commit 9b2877ad88
2 changed files with 29 additions and 0 deletions
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1
source/blender/blenlib/BLI_listbase.h
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@ -76,6 +76,7 @@ int BLI_listbase_count(const struct ListBase *listbase) ATTR_WARN_UNUSED_RESULT
void BLI_freelinkN(struct ListBase *listbase, void *vlink) ATTR_NONNULL(1);
void BLI_listbase_swaplinks(struct ListBase *listbase, void *vlinka, void *vlinkb) ATTR_NONNULL(1, 2);
void BLI_listbases_swaplinks(struct ListBase *listbasea, struct ListBase *listbaseb, void *vlinka, void *vlinkb) ATTR_NONNULL(2, 3);
void BLI_movelisttolist(struct ListBase *dst, struct ListBase *src) ATTR_NONNULL(1, 2);
void BLI_duplicatelist(struct ListBase *dst, const struct ListBase *src) ATTR_NONNULL(1, 2);

28
source/blender/blenlib/intern/listbase.c
View File

@ -169,6 +169,34 @@ void BLI_listbase_swaplinks(ListBase *listbase, void *vlinka, void *vlinkb)
else if (listbase->first == linkb) listbase->first = linka;
}
/**
* Swaps \a vlinka and \a vlinkb from their respective lists. Assumes they are both already in their lista!
*/
void BLI_listbases_swaplinks(ListBase *listbasea, ListBase *listbaseb, void *vlinka, void *vlinkb)
{
Link *linka = vlinka;
Link *linkb = vlinkb;
Link linkc = {NULL};
if (!linka || !linkb) {
return;
}
/* Temporary link to use as placeholder of the links positions */
BLI_insertlinkafter(listbasea, linka, &linkc);
/* Bring linka into linkb position */
BLI_remlink(listbasea, linka);
BLI_insertlinkafter(listbaseb, linkb, linka);
/* Bring linkb into linka position */
BLI_remlink(listbaseb, linkb);
BLI_insertlinkafter(listbasea, &linkc, linkb);
/* Remove temporary link */
BLI_remlink(listbasea, &linkc);
}
/**
* Removes the head from \a listbase and returns it.
*/