From 5d24495704b5d2e4af2f9c8d982a9aaa5fe4ea6a Mon Sep 17 00:00:00 2001
From: Jonathan White <support@dmapps.us>
Date: Sat, 12 Oct 2024 16:17:12 -0400
Subject: [PATCH] Hide the menubar when menus lose focus (if toggled off)

* Fixes #10768
* Also fix menubar toggling not working if Qt version is less than 5.15
---
 src/gui/MainWindow.cpp | 54 ++++++++++++++++++++++++++++--------------
 src/gui/MainWindow.h   |  6 +++--
 2 files changed, 40 insertions(+), 20 deletions(-)

diff --git a/src/gui/MainWindow.cpp b/src/gui/MainWindow.cpp
index 1d9c9ba32f..6d0c510e0d 100644
--- a/src/gui/MainWindow.cpp
+++ b/src/gui/MainWindow.cpp
@@ -553,14 +553,12 @@ MainWindow::MainWindow()
 
     connect(osUtils, &OSUtilsBase::statusbarThemeChanged, this, &MainWindow::updateTrayIcon);
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
-    // Install event filter for empty-area drag
+    // Install event filter for empty-area drag and menubar toggle
     auto* eventFilter = new MainWindowEventFilter(this);
     m_ui->menubar->installEventFilter(eventFilter);
     m_ui->toolBar->installEventFilter(eventFilter);
     m_ui->tabWidget->tabBar()->installEventFilter(eventFilter);
     installEventFilter(eventFilter);
-#endif
 
 #ifdef Q_OS_MACOS
     setUnifiedTitleAndToolBarOnMac(true);
@@ -2119,11 +2117,29 @@ void MainWindow::initActionCollection()
     QTimer::singleShot(1, ac, &ActionCollection::restoreShortcuts);
 }
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
-
 MainWindowEventFilter::MainWindowEventFilter(QObject* parent)
     : QObject(parent)
 {
+    m_altCoolDown.setInterval(250);
+    m_altCoolDown.setSingleShot(true);
+
+    m_menubarTimer.setInterval(250);
+    m_menubarTimer.setSingleShot(false);
+    connect(&m_menubarTimer, &QTimer::timeout, this, [this] {
+        auto mainwindow = getMainWindow();
+        if (mainwindow && mainwindow->m_ui->menubar->isVisible() && config()->get(Config::GUI_HideMenubar).toBool()) {
+            // If the menu bar is visible with no active menu, hide it
+            if (!mainwindow->m_ui->menubar->activeAction()) {
+                mainwindow->m_ui->menubar->setVisible(false);
+                m_altCoolDown.start();
+                m_menubarTimer.stop();
+            }
+            // Conditions to hide the menubar or stop the timer have not been met
+            return;
+        }
+        // We no longer need the timer
+        m_menubarTimer.stop();
+    });
 }
 
 /**
@@ -2139,6 +2155,8 @@ bool MainWindowEventFilter::eventFilter(QObject* watched, QEvent* event)
 
     auto eventType = event->type();
     if (eventType == QEvent::MouseButtonPress) {
+#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
+        // startSystemMove was introduced in Qt 5.15
         auto mouseEvent = dynamic_cast<QMouseEvent*>(event);
         if (watched == mainWindow->m_ui->menubar) {
             if (!mainWindow->m_ui->menubar->actionAt(mouseEvent->pos())) {
@@ -2156,22 +2174,22 @@ bool MainWindowEventFilter::eventFilter(QObject* watched, QEvent* event)
                 return true;
             }
         }
-    } else if (eventType == QEvent::KeyRelease) {
-        if (watched == mainWindow) {
-            auto keyEvent = dynamic_cast<QKeyEvent*>(event);
-            if (keyEvent->key() == Qt::Key_Alt && !keyEvent->modifiers()
-                && config()->get(Config::GUI_HideMenubar).toBool()) {
-                auto menubar = mainWindow->m_ui->menubar;
-                menubar->setVisible(!menubar->isVisible());
-                if (menubar->isVisible()) {
-                    menubar->setActiveAction(mainWindow->m_ui->menuFile->menuAction());
-                }
-                return false;
+#endif
+    } else if (eventType == QEvent::KeyRelease && watched == mainWindow) {
+        auto keyEvent = dynamic_cast<QKeyEvent*>(event);
+        if (keyEvent->key() == Qt::Key_Alt && !keyEvent->modifiers() && config()->get(Config::GUI_HideMenubar).toBool()
+            && !m_altCoolDown.isActive()) {
+            auto menubar = mainWindow->m_ui->menubar;
+            menubar->setVisible(!menubar->isVisible());
+            if (menubar->isVisible()) {
+                menubar->setActiveAction(mainWindow->m_ui->menuFile->menuAction());
+                m_menubarTimer.start();
+            } else {
+                m_menubarTimer.stop();
             }
+            return true;
         }
     }
 
     return QObject::eventFilter(watched, event);
 }
-
-#endif
diff --git a/src/gui/MainWindow.h b/src/gui/MainWindow.h
index 578d6a91f8..51a9f79424 100644
--- a/src/gui/MainWindow.h
+++ b/src/gui/MainWindow.h
@@ -206,7 +206,6 @@ private slots:
     friend class MainWindowEventFilter;
 };
 
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
 class MainWindowEventFilter : public QObject
 {
     Q_OBJECT
@@ -214,8 +213,11 @@ class MainWindowEventFilter : public QObject
 public:
     explicit MainWindowEventFilter(QObject* parent);
     bool eventFilter(QObject* watched, QEvent* event) override;
+
+private:
+    QTimer m_menubarTimer;
+    QTimer m_altCoolDown;
 };
-#endif
 
 /**
  * Return instance of MainWindow created on app load