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Telegram/lib_ui/ui/text/text_stack_engine.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include "ui/text/text.h"
+
+#include <private/qfontengine_p.h>
+
+namespace Ui::Text {
+
+class StackEngine final {
+public:
+	explicit StackEngine(
+		not_null<const String*> t,
+		gsl::span<QScriptAnalysis> analysis,
+		int from = 0,
+		int till = -1,
+		int blockIndexHint = 0);
+	explicit StackEngine(
+		not_null<const String*> t,
+		int offset,
+		const QString &text,
+		gsl::span<QScriptAnalysis> analysis,
+		int blockIndexHint = 0,
+		int blockIndexLimit = -1);
+
+	[[nodiscard]] QTextEngine &wrapped() {
+		return _engine;
+	}
+
+	void itemize();
+	std::vector<Block>::const_iterator shapeGetBlock(int item);
+	[[nodiscard]] int blockIndex(int position) const;
+
+private:
+	void updateFont(not_null<const AbstractBlock*> block);
+	[[nodiscard]] std::vector<Block>::const_iterator adjustBlock(
+		int offset) const;
+	[[nodiscard]] int blockPosition(
+		std::vector<Block>::const_iterator i) const;
+	[[nodiscard]] int blockEnd(std::vector<Block>::const_iterator i) const;
+
+	const not_null<const String*> _t;
+	const QString &_text;
+	QScriptAnalysis *_analysis = nullptr;
+	const int _offset = 0;
+	const int _positionEnd = 0;
+	style::font _font;
+	QStackTextEngine _engine;
+
+	const std::vector<Block> &_tBlocks;
+	std::vector<Block>::const_iterator _bStart;
+	std::vector<Block>::const_iterator _bEnd;
+	mutable std::vector<Block>::const_iterator _bCached;
+
+};
+
+} // namespace Ui::Text