From a87e70c96e2105626e2a1db7575d30e58cfe744c Mon Sep 17 00:00:00 2001
From: ArthurSonzogni <sonzogniarthur@gmail.com>
Date: Sun, 30 Jun 2019 23:53:56 +0200
Subject: [PATCH] Handle terminal resize.

This is related to bug:
https://github.com/ArthurSonzogni/FTXUI/issues/3
---
 src/ftxui/component/screen_interactive.cpp | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/ftxui/component/screen_interactive.cpp b/src/ftxui/component/screen_interactive.cpp
index 6df16c3..ca5ef5c 100644
--- a/src/ftxui/component/screen_interactive.cpp
+++ b/src/ftxui/component/screen_interactive.cpp
@@ -16,6 +16,9 @@ namespace ftxui {
 static const char* HIDE_CURSOR = "\e[?25l";
 static const char* SHOW_CURSOR = "\e[?25h";
 
+static const char* DISABLE_LINE_WRAP = "\e[7l";
+static const char* ENABLE_LINE_WRAP = "\e[7h";
+
 std::stack<std::function<void()>> on_exit_functions;
 void OnExit(int signal) {
   while (!on_exit_functions.empty()) {
@@ -27,6 +30,11 @@ void OnExit(int signal) {
     quick_exit(SIGINT);
 }
 
+std::function<void()> on_resize = []{};
+void OnResize(int signal) {
+  on_resize();
+}
+
 ScreenInteractive::ScreenInteractive(int dimx,
                                      int dimy,
                                      Dimension dimension)
@@ -96,13 +104,21 @@ void ScreenInteractive::Loop(Component* component) {
   tcsetattr(STDIN_FILENO, TCSANOW, &terminal_configuration_new);
 
   // Hide the cursor and show it at exit.
-  std::cout << HIDE_CURSOR << std::flush;
-  on_exit_functions.push([&]{
+  std::cout << HIDE_CURSOR;
+  std::cout << DISABLE_LINE_WRAP;
+  std::cout << std::flush;
+  on_exit_functions.push([&] {
     std::cout << reset_cursor_position;
     std::cout << SHOW_CURSOR;
+    std::cout << ENABLE_LINE_WRAP;
     std::cout << std::flush;
   });
 
+  // Handle resize.
+  on_resize = [&] { PostEvent(Event::Special({0})); };
+  auto old_sigwinch_handler = std::signal(SIGWINCH, OnResize);
+  on_exit_functions.push([&] { std::signal(SIGWINCH, old_sigwinch_handler); });
+
   std::thread read_char([this] {
     while (!quit_) {
       auto event = Event::GetEvent([] { return (char)getchar(); });
@@ -117,7 +133,6 @@ void ScreenInteractive::Loop(Component* component) {
     Clear();
     EventLoop(component);
   }
-
   read_char.join();
   OnExit(0);
 }