From 50184f994699a19185a2c3e73861bb13f5579d23 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Sun, 3 Aug 2025 09:03:12 +0200
Subject: Fix "Callback or event on minimize of the main window" for X11
 platform (#1288)

---
 src/Fl_x.cxx | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'src')

diff --git a/src/Fl_x.cxx b/src/Fl_x.cxx
index 81a6916d0..fed46a638 100644
--- a/src/Fl_x.cxx
+++ b/src/Fl_x.cxx
@@ -202,6 +202,7 @@ static Atom fl_NET_WM_STATE;
 static Atom fl_NET_WM_STATE_FULLSCREEN;
 static Atom fl_NET_WM_STATE_MAXIMIZED_VERT;
 static Atom fl_NET_WM_STATE_MAXIMIZED_HORZ;
+static Atom fl_NET_WM_STATE_HIDDEN;
 static Atom fl_NET_WM_FULLSCREEN_MONITORS;
 Atom fl_NET_WORKAREA;
 static Atom fl_NET_WM_ICON;
@@ -602,6 +603,7 @@ void open_display_i(Display* d) {
   fl_NET_WM_STATE_FULLSCREEN = XInternAtom(d, "_NET_WM_STATE_FULLSCREEN", 0);
   fl_NET_WM_STATE_MAXIMIZED_VERT = XInternAtom(d, "_NET_WM_STATE_MAXIMIZED_VERT", 0);
   fl_NET_WM_STATE_MAXIMIZED_HORZ = XInternAtom(d, "_NET_WM_STATE_MAXIMIZED_HORZ", 0);
+  fl_NET_WM_STATE_HIDDEN = XInternAtom(d, "_NET_WM_STATE_HIDDEN",  0);
   fl_NET_WM_FULLSCREEN_MONITORS = XInternAtom(d, "_NET_WM_FULLSCREEN_MONITORS", 0);
   fl_NET_WORKAREA       = XInternAtom(d, "_NET_WORKAREA",       0);
   fl_NET_WM_ICON        = XInternAtom(d, "_NET_WM_ICON",        0);
@@ -2125,6 +2127,7 @@ int fl_handle(const XEvent& thisevent)
     if (xevent.xproperty.atom == fl_NET_WM_STATE) {
       int fullscreen_state = 0;
       int maximize_state = 0;
+      int minimize_state = 0;
       if (xevent.xproperty.state != PropertyDelete) {
         unsigned long nitems;
         unsigned long *words = 0;
@@ -2136,6 +2139,9 @@ int fl_handle(const XEvent& thisevent)
             if (words[item] == fl_NET_WM_STATE_MAXIMIZED_HORZ) {
               maximize_state = 1;
             }
+            if (words[item] == fl_NET_WM_STATE_HIDDEN) {
+              minimize_state = 1;
+            }
           }
         }
         if ( words ) { XFree(words); words = 0; }
@@ -2149,6 +2155,13 @@ int fl_handle(const XEvent& thisevent)
         window->_set_fullscreen();
         event = FL_FULLSCREEN;
       }
+      if (!event) {
+        if (minimize_state) {
+          event = FL_HIDE;
+        } else if (!window->visible()) {
+          event = FL_SHOW;
+        }
+      }
     }
     break;
 
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