Allow to use a window without titlebar

This might look better than a popup on Windows 11 because we'd still get
the round window corners.

tray/gui/traymenu.cpp

@@ -19,7 +19,7 @@ namespace QtGui {
 TrayMenu::TrayMenu(TrayIcon *trayIcon, QWidget *parent)
     : QMenu(parent)
     , m_trayIcon(trayIcon)
-    , m_windowed(false)
+    , m_windowType(WindowType::Popup)
 {
     setObjectName(QStringLiteral("QtGui::TrayMenu"));
     auto *const menuLayout = new QHBoxLayout;
@@ -68,23 +68,50 @@ void TrayMenu::showUsingPositioningSettings()
     activateWindow();
 }
 
-void TrayMenu::setWindowed(bool windowed)
+void TrayMenu::setWindowType(int windowType)
 {
-    if (m_windowed != windowed) {
-        setWindowFlags((m_windowed = windowed) ? Qt::Window : Qt::FramelessWindowHint | Qt::Popup);
+    if (windowType >= 0 && windowType <= 2) {
+        setWindowType(static_cast<WindowType>(windowType));
     }
 }
 
+void TrayMenu::setWindowType(WindowType windowType)
+{
+    if (m_windowType == windowType) {
+        return;
+    }
+    auto flags = Qt::WindowFlags();
+    switch (m_windowType = windowType) {
+    case WindowType::Popup:
+        flags = Qt::FramelessWindowHint | Qt::Popup;
+        break;
+    case WindowType::NormalWindow:
+        flags = Qt::Window;
+        break;
+    case WindowType::CustomWindow:
+        flags = Qt::Dialog | Qt::CustomizeWindowHint;
+        break;
+    }
+    setWindowFlags(flags);
+}
+
 void TrayMenu::mousePressEvent(QMouseEvent *event)
 {
-    if (!m_windowed) {
+    if (m_windowType != TrayMenu::WindowType::NormalWindow) {
         QMenu::mousePressEvent(event);
     }
 }
 
+void TrayMenu::mouseReleaseEvent(QMouseEvent *event)
+{
+    if (m_windowType != TrayMenu::WindowType::NormalWindow) {
+        QMenu::mouseReleaseEvent(event);
+    }
+}
+
 void TrayMenu::paintEvent(QPaintEvent *event)
 {
-    if (!m_windowed) {
+    if (m_windowType == WindowType::Popup) {
         QMenu::paintEvent(event);
     } else {
         QPainter(this).fillRect(event->rect(), palette().window());
@@ -92,10 +119,13 @@ void TrayMenu::paintEvent(QPaintEvent *event)
     }
 }
 
-void TrayMenu::mouseReleaseEvent(QMouseEvent *event)
+void TrayMenu::focusOutEvent(QFocusEvent *)
 {
-    if (!m_windowed) {
-        QMenu::mouseReleaseEvent(event);
+    if (m_windowType == WindowType::CustomWindow) {
+        if (const auto *fw = focusWidget(); fw->hasFocus()) {
+            return;
+        }
+        close();
     }
 }
 

tray/gui/traymenu.h

@@ -10,30 +10,37 @@ class TrayWidget;
 
 class TrayMenu : public QMenu {
     Q_OBJECT
-    Q_PROPERTY(bool windowed READ isWindowed WRITE setWindowed)
 
 public:
+    enum class WindowType {
+        Popup,
+        NormalWindow,
+        CustomWindow,
+    };
+
     explicit TrayMenu(TrayIcon *trayIcon = nullptr, QWidget *parent = nullptr);
 
     QSize sizeHint() const override;
     TrayWidget &widget();
     const TrayWidget &widget() const;
     TrayIcon *icon();
-    bool isWindowed() const;
+    WindowType windowType() const;
+    void setWindowType(int windowType);
+    void setWindowType(WindowType windowType);
 
 public Q_SLOTS:
     void showUsingPositioningSettings();
-    void setWindowed(bool windowed);
 
 protected:
     void mouseReleaseEvent(QMouseEvent *) override;
     void mousePressEvent(QMouseEvent *) override;
     void paintEvent(QPaintEvent *) override;
+    void focusOutEvent(QFocusEvent *) override;
 
 private:
     TrayWidget *m_trayWidget;
     TrayIcon *m_trayIcon;
-    bool m_windowed = false;
+    WindowType m_windowType;
 };
 
 inline TrayWidget &TrayMenu::widget()
@@ -51,9 +58,9 @@ inline TrayIcon *TrayMenu::icon()
     return m_trayIcon;
 }
 
-inline bool TrayMenu::isWindowed() const
+inline TrayMenu::WindowType TrayMenu::windowType() const
 {
-    return m_windowed;
+    return m_windowType;
 }
 
 } // namespace QtGui

tray/gui/traywidget.cpp

@@ -596,7 +596,7 @@ void TrayWidget::applySettings(const QString &connectionConfig)
         }
     }
     if (m_menu) {
-        m_menu->setWindowed(settings.appearance.windowed);
+        m_menu->setWindowType(settings.appearance.windowType);
     }
 
     // update status icon and text of tray icon because reconnect interval might have changed
@@ -934,7 +934,7 @@ void TrayWidget::concludeWizard(const QString &errorMessage)
 
 void TrayWidget::showDialog(QWidget *dlg, bool maximized)
 {
-    if (m_menu && !m_menu->isWindowed()) {
+    if (m_menu && m_menu->windowType() != TrayMenu::WindowType::NormalWindow) {
         m_menu->close();
     }
     if (maximized) {

widgets/settings/appearanceoptionpage.ui

@@ -383,6 +383,11 @@
        <string>Normal window</string>
       </property>
      </item>
+     <item>
+      <property name="text">
+       <string>Window without titlebar</string>
+      </property>
+     </item>
     </widget>
    </item>
    <item row="2" column="0">

widgets/settings/settings.cpp

@@ -347,7 +347,11 @@ bool restore()
     auto &appearance = v.appearance;
     appearance.showTraffic = settings.value(QStringLiteral("showTraffic"), appearance.showTraffic).toBool();
     appearance.showTabTexts = settings.value(QStringLiteral("showTabTexts"), appearance.showTabTexts).toBool();
-    appearance.windowed = settings.value(QStringLiteral("windowed"), appearance.windowed).toBool();
+    if (auto windowType = settings.value(QStringLiteral("windowType")); windowType.isValid()) {
+        appearance.windowType = windowType.toInt();
+    } else if (auto windowed = settings.value(QStringLiteral("windowed")); windowed.isValid()) {
+        appearance.windowType = !windowed.toBool() ? 0 : 1;
+    }
     appearance.trayMenuSize = settings.value(QStringLiteral("trayMenuSize"), appearance.trayMenuSize).toSize();
     appearance.frameStyle = settings.value(QStringLiteral("frameStyle"), appearance.frameStyle).toInt();
     appearance.tabPosition = settings.value(QStringLiteral("tabPos"), appearance.tabPosition).toInt();
@@ -471,7 +475,7 @@ bool save()
     const auto &appearance = v.appearance;
     settings.setValue(QStringLiteral("showTraffic"), appearance.showTraffic);
     settings.setValue(QStringLiteral("showTabTexts"), appearance.showTabTexts);
-    settings.setValue(QStringLiteral("windowed"), appearance.windowed);
+    settings.setValue(QStringLiteral("windowType"), appearance.windowType);
     settings.setValue(QStringLiteral("trayMenuSize"), appearance.trayMenuSize);
     settings.setValue(QStringLiteral("frameStyle"), appearance.frameStyle);
     settings.setValue(QStringLiteral("tabPos"), appearance.tabPosition);

widgets/settings/settings.h

@@ -64,7 +64,7 @@ struct SYNCTHINGWIDGETS_EXPORT NotifyOn {
 struct SYNCTHINGWIDGETS_EXPORT Appearance {
     bool showTraffic = true;
     bool showTabTexts = true;
-    bool windowed = false;
+    int windowType = 0; // corresponds to TrayMenu::WindowType
     QSize trayMenuSize = QSize(575, 475);
     int frameStyle = static_cast<int>(QFrame::NoFrame) | static_cast<int>(QFrame::Plain);
     int tabPosition = QTabWidget::South;

widgets/settings/settingsdialog.cpp

@@ -465,7 +465,7 @@ bool AppearanceOptionPage::apply()
 {
     auto &v = values();
     auto &settings = v.appearance;
-    settings.windowed = ui()->windowTypeComboBox->currentIndex() == 1;
+    settings.windowType = ui()->windowTypeComboBox->currentIndex();
     settings.trayMenuSize.setWidth(ui()->widthSpinBox->value());
     settings.trayMenuSize.setHeight(ui()->heightSpinBox->value());
     settings.showTraffic = ui()->showTrafficCheckBox->isChecked();
@@ -508,7 +508,7 @@ void AppearanceOptionPage::reset()
 {
     const auto &v = values();
     const auto &settings = v.appearance;
-    ui()->windowTypeComboBox->setCurrentIndex(settings.windowed ? 1 : 0);
+    ui()->windowTypeComboBox->setCurrentIndex(settings.windowType);
     ui()->widthSpinBox->setValue(settings.trayMenuSize.width());
     ui()->heightSpinBox->setValue(settings.trayMenuSize.height());
     ui()->showTrafficCheckBox->setChecked(settings.showTraffic);