From 4bff15278e83616e4da6be9d36ed05c0c949545b Mon Sep 17 00:00:00 2001
From: Matthias Melcher <github@matthiasm.com>
Date: Thu, 5 Jan 2023 15:20:05 +0100
Subject: [PATCH] Adding Fl::hide_all_windows()

---
 FL/Fl.H    |  1 +
 src/Fl.cxx | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/FL/Fl.H b/FL/Fl.H
index 6f51181a4..589d52109 100644
--- a/FL/Fl.H
+++ b/FL/Fl.H
@@ -453,6 +453,7 @@ public:
    \version 1.4.0
    */
   static void program_should_quit(int should_i) { program_should_quit_ = should_i; }
+  static void hide_all_windows();
 
   static Fl_Widget* readqueue();
 
diff --git a/src/Fl.cxx b/src/Fl.cxx
index e7ba9f04d..53fb7fff1 100644
--- a/src/Fl.cxx
+++ b/src/Fl.cxx
@@ -668,6 +668,17 @@ int Fl::ready()
   return system_driver()->ready();
 }
 
+/** Hide all visible window to make FLTK leav Fl::run().
+ Fl:run() will run as long as there are visible windows. Call hide_all_windows()
+ will hide all windows, effectively terminating the Fl::run() loop.
+ \see Fl::run()
+ */
+void Fl::hide_all_windows() {
+  while (Fl::first_window()) {
+    Fl::first_window()->hide();
+  }
+}
+
 int Fl::program_should_quit_ = 0;
 
 ////////////////////////////////////////////////////////////////