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23rd
50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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class Painter;
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// Alphabetical section headers ("A", "B", ..., "#") shown above the first
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// row of every letter group. Pure layout/geometry helper: it owns the
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// per-row prefix counts and answers position / hit-test queries in
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// coordinates relative to the top of the rows region.
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class PeerListSectionHeaders final {
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public:
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void rebuild(int count, int rowHeight, Fn<QString(int index)> section);
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void clear();
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[[nodiscard]] bool empty() const {
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return !_count;
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}
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[[nodiscard]] int total() const {
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return _total;
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}
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// Whether a header is drawn above the row with the given shown index.
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[[nodiscard]] bool hasHeader(int index) const;
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// Top of the row content, relative to the top of the rows region.
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[[nodiscard]] int contentTop(int index) const;
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// Full height of the rows region including all headers.
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[[nodiscard]] int fullHeight() const;
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// Shown row index at the given y (relative to the rows region top), or
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// -1 when y falls into a header band or outside any row content.
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[[nodiscard]] int rowFromY(int y) const;
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void paint(Painter &p, int outerWidth, const QString &text) const;
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private:
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std::vector<int> _prefix;
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int _total = 0;
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int _count = 0;
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int _rowHeight = 0;
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};
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