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feat(obj): subdivide LV_OBJ_FLAG_SCROLL_CHAIN into ...CHAIN_HOR and ...CHAIN_VER (#2961)

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* feat(obj scroll):subdivide LV_OBJ_FLAG_SCROLL_CHAIN into ...CHAIN_HOR and ...CHAIN_VER

* feat(roller):open the horizontal scroll chain

* chore(docs):improve the description of scroll chain
This commit is contained in:
guoweilkd
2022-01-05 20:44:05 +08:00
committed by GitHub
parent 0a1d7d9ef2
commit ee3aa07a83
5 changed files with 37 additions and 27 deletions
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docs/overview/scroll.md
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@@ -89,7 +89,7 @@ OR-ed values are also possible. E.g. `LV_DIR_TOP | LV_DIR_LEFT`.
If an object can't be scrolled further (e.g. its content has reached the bottom-most position) additional scrolling is propagated to its parent. If the parent can be scrolled in that direction than it will be scrolled instead.
It continues propagating to the grandparent and grand-grandparents as well.
The propagation on scrolling is called "scroll chaining" and it can be enabled/disabled with the `LV_OBJ_FLAG_SCROLL_CHAIN` flag.
The propagation on scrolling is called "scroll chaining" and it can be enabled/disabled with `LV_OBJ_FLAG_SCROLL_CHAIN_HOR/VER` flag.
If chaining is disabled the propagation stops on the object and the parent(s) won't be scrolled.
### Scroll momentum