Add a DisableMouseEvents() on ScreenInteractive to disable mouse events

When mouse events are enabled, it is not possible to select text
in the terminal and copy it somewhere else. This could be usefull
for some applications if they don't need to handle mouse events.

Add a function on the ScreenInteractive class to disable grabbing
of mouse events so that it is e.g. possible to select text in the
user interface. The function needs to be called on the screen object
before starting the application loop if such a behaviour is desired.

include/ftxui/component/screen_interactive.hpp

@@ -51,6 +51,11 @@ class ScreenInteractive : public Screen {
   // temporarily uninstalled.
   Closure WithRestoredIO(Closure);
 
+  // Disable all mouse events. This will make it possible to select
+  // parts of the screen in a terminal, and e.g. copy and paste it.
+  // It has to be called before loop construction.
+  void DisableMouseEvents();
+
  private:
   void ExitNow();
 
@@ -104,6 +109,8 @@ class ScreenInteractive : public Screen {
 
   bool frame_valid_ = false;
 
+  bool mouse_events_enabled = true;
+
   friend class Loop;
 
  public:

src/ftxui/component/screen_interactive.cpp

@@ -482,6 +482,10 @@ Closure ScreenInteractive::WithRestoredIO(Closure fn) {  // NOLINT
   };
 }
 
+void ScreenInteractive::DisableMouseEvents() {
+  mouse_events_enabled = false;
+}
+
 // static
 ScreenInteractive* ScreenInteractive::Active() {
   return g_active_screen;
@@ -580,10 +584,12 @@ void ScreenInteractive::Install() {
       DECMode::kLineWrap,
   });
 
-  enable({DECMode::kMouseVt200});
-  enable({DECMode::kMouseAnyEvent});
-  enable({DECMode::kMouseUrxvtMode});
-  enable({DECMode::kMouseSgrExtMode});
+  if (mouse_events_enabled) {
+    enable({DECMode::kMouseVt200});
+    enable({DECMode::kMouseAnyEvent});
+    enable({DECMode::kMouseUrxvtMode});
+    enable({DECMode::kMouseSgrExtMode});
+  }
 
   // After installing the new configuration, flush it to the terminal to
   // ensure it is fully applied: