Added layout utils file.

Telegram/CMakeLists.txt

@@ -704,6 +704,8 @@ PRIVATE
     lang/lang_numbers_animation.h
     lang/lang_translator.cpp
     lang/lang_translator.h
+    layout/layout_utils.cpp
+    layout/layout_utils.h
     main/main_account.cpp
     main/main_account.h
     main/main_app_config.cpp

Telegram/SourceFiles/layout/layout_utils.cpp

@@ -0,0 +1,26 @@
+/*
+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_utils.h"
+
+namespace Layout {
+
+Layout::Position IndexToPosition(int index) {
+	return {
+		(index >= 0) ? (index / MatrixRowShift) : -1,
+		(index >= 0) ? (index % MatrixRowShift) : -1 };
+}
+
+int PositionToIndex(int row, int column) {
+	return row * MatrixRowShift + column;
+}
+
+int PositionToIndex(const Layout::Position &position) {
+	return PositionToIndex(position.row, position.column);
+}
+
+} // namespace Layout

Telegram/SourceFiles/layout/layout_utils.h

@@ -0,0 +1,21 @@
+/*
+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
+*/
+#pragma once
+
+namespace Layout {
+
+struct Position {
+	int row = -1;
+	int column = -1;
+};
+
+[[nodiscard]] Position IndexToPosition(int index);
+[[nodiscard]] int PositionToIndex(int row, int column);
+[[nodiscard]] int PositionToIndex(const Position &position);
+
+} // namespace Layout