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Telegram/SourceFiles/dialogs/dialogs_list.cpp

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+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "dialogs/dialogs_list.h"
+
+#include "dialogs/dialogs_entry.h"
+#include "dialogs/ui/dialogs_layout.h"
+#include "data/data_session.h"
+
+namespace Dialogs {
+
+List::List(SortMode sortMode, FilterId filterId)
+: _sortMode(sortMode)
+, _filterId(filterId) {
+}
+
+List::const_iterator List::cfind(Row *value) const {
+	return value
+		? (cbegin() + value->index())
+		: cend();
+}
+
+not_null<Row*> List::addToEnd(Key key) {
+	if (const auto result = getRow(key)) {
+		return result;
+	}
+	const auto result = _rowByKey.emplace(
+		key,
+		std::make_unique<Row>(key, _rows.size(), height())
+	).first->second.get();
+	result->recountHeight(_narrowRatio, _filterId);
+	_rows.emplace_back(result);
+	if (_sortMode == SortMode::Date) {
+		adjustByDate(result);
+	}
+	return result;
+}
+
+Row *List::adjustByName(Key key) {
+	Expects(_sortMode == SortMode::Name);
+
+	const auto row = getRow(key);
+	if (!row) {
+		return nullptr;
+	}
+	adjustByName(row);
+	return row;
+}
+
+not_null<Row*> List::addByName(Key key) {
+	Expects(_sortMode == SortMode::Name);
+
+	const auto row = addToEnd(key);
+	adjustByName(key);
+	return row;
+}
+
+void List::adjustByName(not_null<Row*> row) {
+	Expects(row->index() >= 0 && row->index() < _rows.size());
+
+	const auto &key = row->entry()->chatListNameSortKey();
+	const auto index = row->index();
+	const auto i = _rows.begin() + index;
+	const auto before = std::find_if(i + 1, _rows.end(), [&](Row *row) {
+		return row->entry()->chatListNameSortKey().compare(key) >= 0;
+	});
+	if (before != i + 1) {
+		rotate(i, i + 1, before);
+	} else if (i != _rows.begin()) {
+		const auto from = std::make_reverse_iterator(i);
+		const auto after = std::find_if(from, _rows.rend(), [&](Row *row) {
+			return row->entry()->chatListNameSortKey().compare(key) <= 0;
+		}).base();
+		if (after != i) {
+			rotate(after, i, i + 1);
+		}
+	}
+}
+
+void List::adjustByDate(not_null<Row*> row) {
+	Expects(_sortMode == SortMode::Date);
+
+	const auto key = row->sortKey(_filterId);
+	const auto index = row->index();
+	const auto i = _rows.begin() + index;
+	const auto before = std::find_if(i + 1, _rows.end(), [&](Row *row) {
+		return (row->sortKey(_filterId) <= key);
+	});
+	if (before != i + 1) {
+		rotate(i, i + 1, before);
+	} else {
+		const auto from = std::make_reverse_iterator(i);
+		const auto after = std::find_if(from, _rows.rend(), [&](Row *row) {
+			return (row->sortKey(_filterId) >= key);
+		}).base();
+		if (after != i) {
+			rotate(after, i, i + 1);
+		}
+	}
+}
+
+bool List::updateHeight(Key key, float64 narrowRatio) {
+	const auto i = _rowByKey.find(key);
+	if (i == _rowByKey.cend()) {
+		return false;
+	}
+	const auto row = i->second.get();
+	const auto index = row->index();
+	auto top = row->top();
+	const auto was = row->height();
+	row->recountHeight(narrowRatio, _filterId);
+	if (row->height() == was) {
+		return false;
+	}
+	for (auto i = _rows.begin() + index, e = _rows.end(); i != e; ++i) {
+		(*i)->_top = top;
+		top += (*i)->height();
+	}
+	return true;
+}
+
+bool List::updateHeights(float64 narrowRatio) {
+	_narrowRatio = narrowRatio;
+	auto was = height();
+	auto top = 0;
+	for (const auto &row : _rows) {
+		row->_top = top;
+		row->recountHeight(narrowRatio, _filterId);
+		top += row->height();
+	}
+	return (height() != was);
+}
+
+bool List::moveToTop(Key key) {
+	const auto i = _rowByKey.find(key);
+	if (i == _rowByKey.cend()) {
+		return false;
+	}
+	const auto index = i->second->index();
+	const auto begin = _rows.begin();
+	rotate(begin, begin + index, begin + index + 1);
+	return true;
+}
+
+void List::rotate(
+		std::vector<not_null<Row*>>::iterator first,
+		std::vector<not_null<Row*>>::iterator middle,
+		std::vector<not_null<Row*>>::iterator last) {
+	auto top = (*first)->top();
+	std::rotate(first, middle, last);
+
+	auto count = (last - first);
+	auto index = (first - _rows.begin());
+	while (count--) {
+		const auto row = *first++;
+		row->_index = index++;
+		row->_top = top;
+		top += row->height();
+	}
+}
+
+bool List::remove(Key key, Row *replacedBy) {
+	auto i = _rowByKey.find(key);
+	if (i == _rowByKey.cend()) {
+		return false;
+	}
+
+	const auto row = i->second.get();
+	row->entry()->owner().dialogsRowReplaced({ row, replacedBy });
+
+	auto top = row->top();
+	const auto index = row->index();
+	_rows.erase(_rows.begin() + index);
+	for (auto i = index, count = int(_rows.size()); i != count; ++i) {
+		const auto row = _rows[i];
+		row->_index = i;
+		row->_top = top;
+		top += row->height();
+	}
+	_rowByKey.erase(i);
+	return true;
+}
+
+Row *List::rowAtY(int y) const {
+	const auto i = findByY(y);
+	if (i == cend()) {
+		return nullptr;
+	}
+	const auto row = *i;
+	const auto top = row->top();
+	const auto bottom = top + row->height();
+	return (top <= y && bottom > y) ? row.get() : nullptr;
+}
+
+List::iterator List::findByY(int y) const {
+	return ranges::lower_bound(_rows, y, ranges::less(), [](const Row *row) {
+		return row->top() + row->height() - 1;
+	});
+}
+
+} // namespace Dialogs