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Codechange: Add `GetVisibleRangeIterators()` to `Scrollbar`.

This commit is contained in:
Peter Nelson 2024-02-26 17:19:12 +00:00 committed by Peter Nelson
parent f612bc6ee2
commit bf865dc536
1 changed files with 14 additions and 0 deletions
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14
src/widget_type.h
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@ -833,6 +833,20 @@ public:
int GetScrolledRowFromWidget(int clickpos, const Window * const w, WidgetID widget, int padding = 0, int line_height = -1) const;
/**
* Get a pair of iterators for the range of visible elements in a container.
* @param container Container of elements represented by the scrollbar.
* @returns Pair of iterators of visible elements.
*/
template <typename Tcontainer>
auto GetVisibleRangeIterators(Tcontainer &container) const
{
assert(this->GetCount() == container.size()); // Scrollbar and container size must match.
auto first = std::next(std::begin(container), this->GetPosition());
auto last = std::next(first, std::min<size_t>(this->GetCapacity(), this->GetCount() - this->GetPosition()));
return std::make_pair(first, last);
}
/**
* Return an iterator pointing to the element of a scrolled widget that a user clicked in.
* @param container Container of elements represented by the scrollbar.