From d62dc6e305cdafbc55c1eeaa0225089a69f9b349 Mon Sep 17 00:00:00 2001
From: Clement Roblot <clement.roblot@martobre.fr>
Date: Mon, 2 Dec 2024 18:48:48 +0700
Subject: [PATCH] Added a decorator to prevent selectability

---
 examples/component/selectable_input.cpp |  2 +-
 include/ftxui/dom/elements.hpp          |  1 +
 src/ftxui/dom/selection.cpp             | 21 +++++++++++++++++++++
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/examples/component/selectable_input.cpp b/examples/component/selectable_input.cpp
index 1055c65d..36e22996 100644
--- a/examples/component/selectable_input.cpp
+++ b/examples/component/selectable_input.cpp
@@ -47,7 +47,7 @@ int main() {
         window(text("Vertical split"), vbox({
                                            LoremIpsum(),
                                            separator(),
-                                           LoremIpsum(),
+                                           LoremIpsum() | unselectable,
                                            separator(),
                                            LoremIpsum(),
                                        })),
diff --git a/include/ftxui/dom/elements.hpp b/include/ftxui/dom/elements.hpp
index a2dd0442..bd086def 100644
--- a/include/ftxui/dom/elements.hpp
+++ b/include/ftxui/dom/elements.hpp
@@ -113,6 +113,7 @@ Decorator focusPositionRelative(float x, float y);
 Element automerge(Element child);
 Decorator hyperlink(std::string link);
 Element hyperlink(std::string link, Element child);
+Element unselectable(Element child);
 
 // --- Layout is
 // Horizontal, Vertical or stacked set of elements.
diff --git a/src/ftxui/dom/selection.cpp b/src/ftxui/dom/selection.cpp
index c45df40c..2e651d54 100644
--- a/src/ftxui/dom/selection.cpp
+++ b/src/ftxui/dom/selection.cpp
@@ -5,8 +5,22 @@
 #include "ftxui/dom/selection.hpp"  // for Selection
 #include <algorithm>                // for max, min
 
+#include "ftxui/dom/elements.hpp"        // for Element, inverted
+#include "ftxui/dom/node_decorator.hpp"  // for NodeDecorator
+
 namespace ftxui {
 
+namespace {
+class Unselectable : public NodeDecorator {
+ public:
+  using NodeDecorator::NodeDecorator;
+
+  void Select(Selection& selection) override {
+    // Overwrite the select method to do nothing.
+  }
+};
+}  // namespace
+
 /// @brief Create a selection.
 /// @param start_x The x coordinate of the start of the selection.
 /// @param start_y The y coordinate of the start of the selection.
@@ -103,4 +117,11 @@ Selection Selection::SaturateVertical(Box box) {
   return Selection(start_x, start_y, end_x, end_y);
 }
 
+/// @brief Add a filter that will invert the foreground and the background
+/// colors.
+/// @ingroup dom
+Element unselectable(Element child) {
+  return std::make_shared<Unselectable>(std::move(child));
+}
+
 }  // namespace ftxui