Move title bar logic regarding close button to base class

So QtQuick can use it too

src/private/TitleBar.cpp

@@ -69,6 +69,7 @@ void TitleBar::init()
         // repaint
         update();
     });
+    updateCloseButton();
 }
 
 TitleBar::~TitleBar()
@@ -89,6 +90,16 @@ bool TitleBar::onDoubleClicked()
     return false;
 }
 
+void TitleBar::updateCloseButton()
+{
+
+    const bool anyNonClosable = frame() ? frame()->anyNonClosable()
+                                        : (floatingWindow() ? floatingWindow()->anyNonClosable()
+                                                            : false);
+
+    setCloseButtonEnabled(!anyNonClosable);
+}
+
 void TitleBar::toggleMaximized()
 {
     if (!m_floatingWindow)
@@ -116,6 +127,14 @@ bool TitleBar::isOverlayed() const
     return m_frame && m_frame->isOverlayed();
 }
 
+void TitleBar::setCloseButtonEnabled(bool enabled)
+{
+    if (enabled != m_closeButtonEnabled) {
+        m_closeButtonEnabled = enabled;
+        Q_EMIT closeButtonEnabledChanged(enabled);
+    }
+}
+
 void TitleBar::setTitle(const QString &title)
 {
     if (title != m_title) {
@@ -362,3 +381,8 @@ void TitleBar::onAutoHideClicked()
         }
     }
 }
+
+bool TitleBar::closeButtonEnabled() const
+{
+    return m_closeButtonEnabled;
+}

src/private/TitleBar_p.h

@@ -41,6 +41,7 @@ class DOCKS_EXPORT TitleBar : public QWidgetAdapter
     Q_OBJECT
     Q_PROPERTY(QString title READ title NOTIFY titleChanged)
     Q_PROPERTY(bool hasIcon READ hasIcon NOTIFY iconChanged)
+    Q_PROPERTY(bool closeButtonEnabled READ closeButtonEnabled WRITE setCloseButtonEnabled NOTIFY closeButtonEnabledChanged)
 public:
     typedef QVector<TitleBar *> List;
 
@@ -95,12 +96,14 @@ public:
     ///@brief getter for m_floatingWindow
     FloatingWindow *floatingWindow() const { return m_floatingWindow; }
 
-    virtual void updateCloseButton() {}
+    /// @brief updates the close button enabled state
+    void updateCloseButton();
 
 Q_SIGNALS:
     void titleChanged();
     void iconChanged();
     void isFocusedChanged();
+    void closeButtonEnabledChanged(bool);
 
 protected:
 
@@ -111,6 +114,8 @@ protected:
     Q_INVOKABLE void toggleMaximized();
     Q_INVOKABLE void onAutoHideClicked();
 
+    bool closeButtonEnabled() const;
+
     virtual void updateFloatButton() {}
     virtual void updateMaximizeButton() {}
 
@@ -124,11 +129,10 @@ protected:
     virtual bool isFloatButtonEnabled() const { return true; }
 
     void focusInEvent(QFocusEvent *event) override;
-
     bool isOverlayed() const;
-
 private:
     friend class ::TestDocks;
+    void setCloseButtonEnabled(bool);
 
     void init();
 
@@ -139,6 +143,7 @@ private:
     Frame *const m_frame;
     FloatingWindow *const m_floatingWindow;
     const bool m_supportsAutoHide;
+    bool m_closeButtonEnabled = true;
 };
 
 

src/private/widgets/TitleBarWidget.cpp

@@ -72,7 +72,6 @@ void TitleBarWidget::init()
     connect(m_minimizeButton, &QAbstractButton::clicked, this, &TitleBarWidget::onMinimizeClicked);
     connect(m_autoHideButton, &QAbstractButton::clicked, this, &TitleBarWidget::onAutoHideClicked);
 
-    updateCloseButton();
     updateFloatButton();
     updateMaximizeButton();
     updateMinimizeButton();
@@ -93,6 +92,9 @@ void TitleBarWidget::init()
         }
         update();
     });
+
+    m_closeButton->setEnabled(closeButtonEnabled());
+    connect(this, &TitleBar::closeButtonEnabledChanged, m_closeButton, &QAbstractButton::setEnabled);
 }
 
 QRect TitleBarWidget::iconRect() const
@@ -154,16 +156,6 @@ void TitleBarWidget::updateFloatButton()
     m_floatButton->setVisible(supportsFloatingButton());
 }
 
-void TitleBarWidget::updateCloseButton()
-{
-    const bool anyNonClosable = frame() ? frame()->anyNonClosable()
-                                        : (floatingWindow() ? floatingWindow()->anyNonClosable()
-                                                            : false);
-
-    qCDebug(closebutton) << Q_FUNC_INFO << "enabled=" << !anyNonClosable;
-    m_closeButton->setEnabled(!anyNonClosable);
-}
-
 void TitleBarWidget::updateMinimizeButton()
 {
     m_minimizeButton->setVisible(supportsMinimizeButton());

src/private/widgets/TitleBarWidget_p.h

@@ -47,7 +47,6 @@ protected:
     void paintEvent(QPaintEvent *) override;
     void mouseDoubleClickEvent(QMouseEvent *) override;
     void updateFloatButton() override;
-    void updateCloseButton() override;
     void updateMaximizeButton() override;
     void updateMinimizeButton() override;
     void updateAutoHideButton() override;