example: Add some helper code to debug focus

examples/dockwidgets/MyFrameworkWidgetFactory.cpp

@@ -39,8 +39,9 @@ public:
     {
         QPainter p(this);
         QPen pen(Qt::black);
-        //QBrush brush(isFocused() ? QColor(0xff, 0x80, 0) : Qt::yellow); // Uncomment to color differently if dock widget is focused
-        QBrush brush(Qt::yellow);
+        const QColor focusedBackgroundColor = Qt::yellow;
+        const QColor backgroundColor = focusedBackgroundColor.darker(115);
+        QBrush brush(isFocused() ? focusedBackgroundColor : backgroundColor);
         pen.setWidth(4);
         p.setPen(pen);
         p.setBrush(brush);

examples/dockwidgets/MyWidget.cpp

@@ -14,6 +14,7 @@
 #include <QPainter>
 #include <QDebug>
 #include <QFile>
+#include <QLineEdit>
 
 static QHash<QString, QImage> s_images; /// clazy:exclude=non-pod-global-static
 
@@ -33,6 +34,14 @@ MyWidget::MyWidget(const QString &backgroundFile, const QString &logoFile, QWidg
             it = s_images.insert(logoFile, QImage(logoFile));
         m_logo = it.value();
     }
+
+    setFocusPolicy(Qt::StrongFocus);
+#if 0
+    // Uncomment to show focus propagation working
+    new QLineEdit(this);
+    auto l2 = new QLineEdit(this);
+    l2->move(0, 100);
+#endif
 }
 
 MyWidget::~MyWidget()

src/DockWidgetBase.cpp

@@ -217,6 +217,13 @@ void DockWidgetBase::setWidget(QWidgetOrQuick *w)
 
     d->widget = w;
     setSizePolicy(w->sizePolicy());
+
+    if (w->focusPolicy() == Qt::NoFocus) {
+        setFocusProxy(nullptr);
+    } else {
+        setFocusProxy(w);
+    }
+
     Q_EMIT widgetChanged(w);
     setWindowTitle(uniqueName());
 }