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Telegram/lib_ui/ui/text/text_word.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 "base/basic_types.h"
+
+#include <private/qfixed_p.h>
+
+namespace Ui::Text {
+
+class Word final {
+public:
+	Word() = default;
+	Word( // !newline
+		uint16 position,
+		bool unfinished,
+		QFixed width,
+		QFixed rbearing)
+	: _position(position)
+	, _rbearing_modulus(std::min(std::abs(rbearing.value()), 0x7FFF))
+	, _rbearing_positive(rbearing.value() > 0 ? 1 : 0)
+	, _unfinished(unfinished ? 1 : 0)
+	, _qfixedwidth(width.value()) {
+	}
+	Word(uint16 position, int newlineBlockIndex)
+	: _position(position)
+	, _newline(1)
+	, _newlineBlockIndex(newlineBlockIndex) {
+	}
+
+	[[nodiscard]] bool newline() const {
+		return _newline != 0;
+	}
+	[[nodiscard]] int newlineBlockIndex() const {
+		return _newline ? _newlineBlockIndex : 0;
+	}
+	[[nodiscard]] bool unfinished() const {
+		return _unfinished != 0;
+	}
+
+	[[nodiscard]] uint16 position() const {
+		return _position;
+	}
+	[[nodiscard]] QFixed f_rbearing() const {
+		return QFixed::fromFixed(
+			int(_rbearing_modulus) * (_rbearing_positive ? 1 : -1));
+	}
+	[[nodiscard]] QFixed f_width() const {
+		return _newline ? 0 : QFixed::fromFixed(_qfixedwidth);
+	}
+	[[nodiscard]] QFixed f_rpadding() const {
+		return _rpadding;
+	}
+
+	void add_rpadding(QFixed padding) {
+		_rpadding += padding;
+	}
+
+private:
+	uint16 _position = 0;
+	uint16 _rbearing_modulus : 13 = 0;
+	uint16 _rbearing_positive : 1 = 0;
+	uint16 _unfinished : 1 = 0;
+	uint16 _newline : 1 = 0;
+
+	// Right padding: spaces after the last content of the block (like a word).
+	// This holds spaces after the end of the block, for example a text ending
+	// with a space before a link has started. If text block has a leading spaces
+	// (for example a text block after a link block) it is prepended with an empty
+	// word that holds those spaces as a right padding.
+	QFixed _rpadding;
+
+	union {
+		int _qfixedwidth;
+		int _newlineBlockIndex;
+	};
+
+};
+
+using Words = std::vector<Word>;
+
+[[nodiscard]] inline uint16 CountPosition(Words::const_iterator i) {
+	return i->position();
+}
+
+} // namespace Ui::Text