mirror of
https://github.com/AyuGram/AyuGramDesktop.git
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23rd
89 lines
2.1 KiB
C++
89 lines
2.1 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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#include "boxes/peer_list_section_headers.h"
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#include "ui/painter.h"
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#include "styles/style_boxes.h"
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void PeerListSectionHeaders::rebuild(
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int count,
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int rowHeight,
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Fn<QString(int index)> section) {
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_count = count;
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_rowHeight = rowHeight;
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_total = 0;
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_prefix.resize(count);
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auto previous = QString();
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for (auto i = 0; i != count; ++i) {
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const auto letter = section(i);
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const auto header = !letter.isEmpty()
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&& (i == 0 || letter != previous);
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if (header) {
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++_total;
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}
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_prefix[i] = _total;
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previous = letter;
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}
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}
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void PeerListSectionHeaders::clear() {
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_prefix.clear();
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_total = 0;
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_count = 0;
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}
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bool PeerListSectionHeaders::hasHeader(int index) const {
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if (index < 0 || index >= int(_prefix.size())) {
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return false;
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}
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return (index == 0)
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? (_prefix[0] > 0)
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: (_prefix[index] > _prefix[index - 1]);
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}
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int PeerListSectionHeaders::contentTop(int index) const {
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const auto headers = (index >= 0 && index < int(_prefix.size()))
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? _prefix[index]
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: 0;
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return index * _rowHeight + headers * st::contactsSortHeaderHeight;
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}
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int PeerListSectionHeaders::fullHeight() const {
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return _count * _rowHeight + _total * st::contactsSortHeaderHeight;
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}
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int PeerListSectionHeaders::rowFromY(int y) const {
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auto low = 0, high = _count;
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while (low < high) {
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const auto middle = (low + high) / 2;
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if (contentTop(middle) <= y) {
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low = middle + 1;
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} else {
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high = middle;
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}
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}
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const auto index = low - 1;
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if (index < 0 || index >= _count) {
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return -1;
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}
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return (y < contentTop(index) + _rowHeight) ? index : -1;
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}
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void PeerListSectionHeaders::paint(
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Painter &p,
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int outerWidth,
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const QString &text) const {
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p.setFont(st::contactsSortHeaderFont);
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p.setPen(st::contactsSortHeaderFg);
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p.drawTextLeft(
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st::contactsSortHeaderPosition.x(),
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st::contactsSortHeaderPosition.y(),
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outerWidth,
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text);
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}
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