From a09ebcc4422f0f07910bb41dd755c1edf6f7b3ab Mon Sep 17 00:00:00 2001
From: ArthurSonzogni <sonzogniarthur@gmail.com>
Date: Fri, 17 Apr 2020 01:15:17 +0200
Subject: [PATCH] Fix bug with container on Windows.

This fix the bug from:
https://github.com/ArthurSonzogni/FTXUI/pull/11

About:
~~~
Bug: Focus handling not working

in the examples (e.g. checkbox.cpp) I can toggle the individual
checkboxes but I cannot move between items, I tried to understand the
focus implementation but am I unsure which keypresses would move focus
between different components
~~~
---
 include/ftxui/component/container.hpp | 2 +-
 src/ftxui/component/container.cpp     | 4 +++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/ftxui/component/container.hpp b/include/ftxui/component/container.hpp
index 97c6d20..51395ed 100644
--- a/include/ftxui/component/container.hpp
+++ b/include/ftxui/component/container.hpp
@@ -37,7 +37,7 @@ class Container : public Component {
   RenderHandler render_handler_;
 
   int selected_ = 0;
-  int* selector_ = &selected_;
+  int* selector_ = nullptr;
 };
 
 }  // namespace ftxui
diff --git a/src/ftxui/component/container.cpp b/src/ftxui/component/container.cpp
index b9743c4..b4b26c5 100644
--- a/src/ftxui/component/container.cpp
+++ b/src/ftxui/component/container.cpp
@@ -42,7 +42,9 @@ bool Container::OnEvent(Event event) {
 Component* Container::ActiveChild() {
   if (children_.size() == 0)
     return nullptr;
-  return children_[*selector_ % children_.size()];
+
+  int selected = selector_ ? *selector_ : selected_;
+  return children_[selected % children_.size()];
 }
 
 bool Container::VerticalEvent(Event event) {