Support for inverted selections.

include/ftxui/dom/selection.hpp

@@ -0,0 +1,33 @@
+// Copyright 2024 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.
+
+#ifndef FTXUI_DOM_SELECTION_HPP
+#define FTXUI_DOM_SELECTION_HPP
+
+#include "ftxui/screen/box.hpp"  // for Box
+
+namespace ftxui {
+
+/// @brief Represent a selection in the terminal.
+class Selection {
+ public:
+  Selection(int start_x, int start_y, int end_x, int end_y);
+  const Box& GetBox() const;
+
+  Selection SaturateHorizontal(Box box);
+  Selection SaturateVertical(Box box);
+
+
+ private:
+  Selection* const parent_ = nullptr;
+  const int start_x_;
+  const int start_y_;
+  const int end_x_;
+  const int end_y_;
+  const Box box_;
+};
+
+}  // namespace ftxui
+
+#endif /* end of include guard: FTXUI_DOM_SELECTION_HPP */