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add methods for listbox visible range

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This commit is contained in:
Jinhao
2018-12-02 06:44:11 +08:00
parent 07a971c6ef
commit 54cfd3075d
2 changed files with 69 additions and 0 deletions
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21
include/nana/gui/widgets/listbox.hpp
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@@ -1555,6 +1555,27 @@ the nana::detail::basic_window member pointer scheme
* @return the reference of *this.
*/
listbox& category_icon(const paint::image& img_expanded, const paint::image&& img_collapsed);
/// Returns first visible element
/**
* It may return an item or a category item.
* @return the index of first visible element.
*/
index_pair first_visible() const;
/// Returns last visible element
/**
* It may return an item or a category item.
* @return the index of last visible element.
*/
index_pair last_visible() const;
/// Returns all visible items
/**
* It returns all visible items that are displayed in listbox window.
* @return index_pairs containing all visible items.
*/
index_pairs visibles() const;
private:
drawerbase::listbox::essence & _m_ess() const;
nana::any* _m_anyobj(size_type cat, size_type index, bool allocate_if_empty) const override;