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Telegram/SourceFiles/layout/layout_mosaic.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 "layout/layout_mosaic.h"
+
+#include "styles/style_chat_helpers.h"
+
+namespace Mosaic::Layout {
+
+AbstractMosaicLayout::AbstractMosaicLayout(int bigWidth)
+: _bigWidth(bigWidth) {
+}
+
+int AbstractMosaicLayout::rowHeightAt(int row) const {
+	Expects(row >= 0 && row < _rows.size());
+
+	return _rows[row].height;
+}
+
+int AbstractMosaicLayout::countDesiredHeight(int newWidth) {
+	auto result = 0;
+	for (auto &row : _rows) {
+		layoutRow(row, newWidth ? newWidth : _width);
+		result += row.height;
+	}
+	return _padding.top() + result + _padding.bottom();
+}
+
+FoundItem AbstractMosaicLayout::findByPoint(const QPoint &globalPoint) const {
+	auto sx = globalPoint.x() - _padding.left();
+	auto sy = globalPoint.y() - _padding.top();
+	auto row = -1;
+	auto col = -1;
+	auto sel = -1;
+	bool exact = true;
+	if (sy >= 0) {
+		row = 0;
+		for (auto rows = rowsCount(); row < rows; ++row) {
+			const auto rowHeight = _rows[row].height;
+			if (sy < rowHeight) {
+				break;
+			}
+			sy -= rowHeight;
+		}
+	} else {
+		row = 0;
+		exact = false;
+	}
+	if (row >= rowsCount()) {
+		row = rowsCount() - 1;
+		exact = false;
+	}
+	if (sx < 0) {
+		sx = 0;
+		exact = false;
+	}
+	if (sx >= 0 && row >= 0 && row < rowsCount()) {
+		const auto columnsCount = _rows[row].items.size();
+		col = 0;
+		for (int cols = columnsCount; col < cols; ++col) {
+			const auto item = itemAt(row, col);
+			const auto width = item->width();
+			if (sx < width) {
+				break;
+			}
+			sx -= width;
+			sx -= _rightSkip;
+		}
+		if (col >= columnsCount) {
+			col = columnsCount - 1;
+			exact = false;
+		}
+
+		sel = ::Layout::PositionToIndex(row, + col);
+	} else {
+		row = col = -1;
+	}
+	return { sel, exact, QPoint(sx, sy) };
+}
+
+QRect AbstractMosaicLayout::findRect(int index) const {
+	const auto clip = QRect(0, 0, _width, 100);
+	const auto fromX = style::RightToLeft()
+		? (_width - clip.x() - clip.width())
+		: clip.x();
+	const auto toX = style::RightToLeft()
+		? (_width - clip.x())
+		: (clip.x() + clip.width());
+	const auto rows = _rows.size();
+	auto top = 0;
+	for (auto row = 0; row != rows; ++row) {
+		auto &inlineRow = _rows[row];
+		// if ((top + inlineRow.height) > clip.top()) {
+			auto left = 0;
+			if (row == (rows - 1)) {
+//				context.lastRow = true;
+			}
+			for (const auto &item : inlineRow.items) {
+				if (left >= toX) {
+					break;
+				}
+
+				const auto w = item->width();
+				if ((left + w) > fromX) {
+					if (item->position() == index) {
+						return QRect(
+							left + _padding.left(),
+							top + _padding.top(),
+							item->width(),
+							item->height());
+					}
+				}
+				left += w;
+				left += _rightSkip;
+			}
+		// }
+		top += inlineRow.height;
+	}
+	return QRect();
+}
+
+void AbstractMosaicLayout::addItems(
+		gsl::span<const not_null<AbstractLayoutItem*>> items) {
+	_rows.reserve(items.size());
+	auto row = Row();
+	row.items.reserve(kInlineItemsMaxPerRow);
+	auto sumWidth = 0;
+	for (const auto &item : items) {
+		addItem(item, row, sumWidth);
+	}
+	rowFinalize(row, sumWidth, true);
+}
+
+void AbstractMosaicLayout::setRightSkip(int rightSkip) {
+	_rightSkip = rightSkip;
+}
+
+void AbstractMosaicLayout::setPadding(QMargins padding) {
+	_padding = padding;
+}
+
+void AbstractMosaicLayout::setFullWidth(int w) {
+	_width = w;
+}
+
+bool AbstractMosaicLayout::empty() const {
+	return _rows.empty();
+}
+
+int AbstractMosaicLayout::rowsCount() const {
+	return _rows.size();
+}
+
+not_null<AbstractLayoutItem*> AbstractMosaicLayout::itemAt(
+		int row,
+		int column) const {
+	Expects((row >= 0)
+		&& (row < _rows.size())
+		&& (column >= 0)
+		&& (column < _rows[row].items.size()));
+
+	return _rows[row].items[column];
+}
+
+not_null<AbstractLayoutItem*> AbstractMosaicLayout::itemAt(int index) const {
+	const auto &[row, column] = ::Layout::IndexToPosition(index);
+	return itemAt(row, column);
+}
+
+AbstractLayoutItem *AbstractMosaicLayout::maybeItemAt(
+		int row,
+		int column) const {
+	if ((row >= 0)
+		&& (row < _rows.size())
+		&& (column >= 0)
+		&& (column < _rows[row].items.size())) {
+		return _rows[row].items[column];
+	}
+	return nullptr;
+}
+
+AbstractLayoutItem *AbstractMosaicLayout::maybeItemAt(int index) const {
+	const auto &[row, column] = ::Layout::IndexToPosition(index);
+	return maybeItemAt(row, column);
+}
+
+void AbstractMosaicLayout::clearRows(bool resultsDeleted) {
+	if (!resultsDeleted) {
+		for (const auto &row : _rows) {
+			for (const auto &item : row.items) {
+				item->setPosition(-1);
+			}
+		}
+	}
+	_rows.clear();
+}
+
+void AbstractMosaicLayout::forEach(
+		Fn<void(not_null<const AbstractLayoutItem*>)> callback) {
+	for (const auto &row : _rows) {
+		for (const auto &item : row.items) {
+			callback(item);
+		}
+	}
+}
+
+void AbstractMosaicLayout::paint(
+		Fn<void(not_null<AbstractLayoutItem*>, QPoint)> paintItem,
+		const QRect &clip) const {
+	auto top = _padding.top();
+	const auto fromX = style::RightToLeft()
+		? (_width - clip.x() - clip.width())
+		: clip.x();
+	const auto toX = style::RightToLeft()
+		? (_width - clip.x())
+		: (clip.x() + clip.width());
+	const auto rows = _rows.size();
+	for (auto row = 0; row != rows; ++row) {
+		if (top >= clip.top() + clip.height()) {
+			break;
+		}
+		auto &inlineRow = _rows[row];
+		if ((top + inlineRow.height) > clip.top()) {
+			auto left = _padding.left();
+			if (row == (rows - 1)) {
+//				context.lastRow = true;
+			}
+			for (const auto &item : inlineRow.items) {
+				if (left >= toX) {
+					break;
+				}
+
+				const auto w = item->width();
+				if ((left + w) > fromX) {
+					paintItem(item, QPoint(left, top));
+				}
+				left += w;
+				left += _rightSkip;
+			}
+		}
+		top += inlineRow.height;
+	}
+}
+
+int AbstractMosaicLayout::validateExistingRows(
+		Fn<bool(not_null<const AbstractLayoutItem*>, int)> checkItem,
+		int count) {
+	auto until = 0;
+	auto untilRow = 0;
+	auto untilCol = 0;
+	while (until < count) {
+		if ((untilRow >= _rows.size())
+			|| checkItem(_rows[untilRow].items[untilCol], until)) {
+			break;
+		}
+		++until;
+		if (++untilCol == _rows[untilRow].items.size()) {
+			++untilRow;
+			untilCol = 0;
+		}
+	}
+	if (until == count) { // All items are layed out.
+		if (untilRow == _rows.size()) { // Nothing changed.
+			return until;
+		}
+
+		{
+			const auto rows = _rows.size();
+			auto skip = untilCol;
+			for (auto i = untilRow; i < rows; ++i) {
+				for (const auto &item : _rows[i].items) {
+					if (skip) {
+						--skip;
+					} else {
+						item->setPosition(-1);
+					}
+				}
+			}
+		}
+		if (!untilCol) { // All good rows are filled.
+			_rows.resize(untilRow);
+			return until;
+		}
+		_rows.resize(untilRow + 1);
+		_rows[untilRow].items.resize(untilCol);
+		_rows[untilRow].maxWidth = ranges::accumulate(
+			_rows[untilRow].items,
+			0,
+			[](int w, auto &row) { return w + row->maxWidth(); });
+		layoutRow(_rows[untilRow], _width);
+		return until;
+	}
+	if (untilRow && !untilCol) { // Remove last row, maybe it is not full.
+		--untilRow;
+		untilCol = _rows[untilRow].items.size();
+	}
+	until -= untilCol;
+
+	for (auto i = untilRow; i < _rows.size(); ++i) {
+		for (const auto &item : _rows[i].items) {
+			item->setPosition(-1);
+		}
+	}
+	_rows.resize(untilRow);
+
+	return until;
+}
+
+void AbstractMosaicLayout::addItem(
+		not_null<AbstractLayoutItem*> item,
+		Row &row,
+		int &sumWidth) {
+	// item->preload();
+
+	using namespace ::Layout;
+	item->setPosition(PositionToIndex(_rows.size(), row.items.size()));
+	if (rowFinalize(row, sumWidth, false)) {
+		item->setPosition(PositionToIndex(_rows.size(), 0));
+	}
+
+	sumWidth += item->maxWidth();
+	if (!row.items.empty() && _rightSkip) {
+		sumWidth += _rightSkip;
+	}
+
+	row.items.push_back(item);
+}
+
+bool AbstractMosaicLayout::rowFinalize(Row &row, int &sumWidth, bool force) {
+	if (row.items.empty()) {
+		return false;
+	}
+
+	const auto full = (row.items.size() >= kInlineItemsMaxPerRow);
+	// Currently use the same GIFs layout for all widget sizes.
+	const auto big = (sumWidth >= _bigWidth);
+	if (full || big || force) {
+		row.maxWidth = (full || big) ? sumWidth : 0;
+		layoutRow(row, _width);
+		_rows.push_back(std::move(row));
+		row = Row();
+		row.items.reserve(kInlineItemsMaxPerRow);
+		sumWidth = 0;
+		return true;
+	}
+	return false;
+}
+
+void AbstractMosaicLayout::layoutRow(Row &row, int fullWidth) {
+	const auto count = int(row.items.size());
+	Assert(count <= kInlineItemsMaxPerRow);
+
+	// Enumerate items in the order of growing maxWidth()
+	// for that sort item indices by maxWidth().
+	int indices[kInlineItemsMaxPerRow];
+	for (auto i = 0; i != count; ++i) {
+		indices[i] = i;
+	}
+	std::sort(indices, indices + count, [&](int a, int b) {
+		return row.items[a]->maxWidth() < row.items[b]->maxWidth();
+	});
+
+	auto desiredWidth = row.maxWidth;
+	row.height = 0;
+	auto availableWidth = fullWidth - _padding.left() - _padding.right();
+	for (auto i = 0; i < count; ++i) {
+		const auto index = indices[i];
+		const auto &item = row.items[index];
+		const auto w = desiredWidth
+			? (item->maxWidth() * availableWidth / desiredWidth)
+			: item->maxWidth();
+		const auto actualWidth = std::max(w, st::inlineResultsMinWidth);
+		row.height = std::max(
+			row.height,
+			item->resizeGetHeight(actualWidth));
+		if (desiredWidth) {
+			availableWidth -= actualWidth;
+			desiredWidth -= row.items[index]->maxWidth();
+			if (index > 0 && _rightSkip) {
+				availableWidth -= _rightSkip;
+				desiredWidth -= _rightSkip;
+			}
+		}
+	}
+}
+
+} // namespace Mosaic::Layout