fix examples on Windows

examples/mainwindow/mainwindow.cpp

@@ -107,6 +107,20 @@ void MainWindow::showEvent(QShowEvent *event)
     }
 }
 
+
+#ifdef Q_OS_WIN
+bool MainWindow::nativeEvent(const QByteArray &eventType, void *message, long *result)
+{
+    if (!m_helper)
+        return QWidget::nativeEvent(eventType, message, result);
+
+    if (m_helper->handleNativeEvent(this->windowHandle(), eventType, message, result))
+        return true;
+    else
+        return QWidget::nativeEvent(eventType, message, result);
+}
+#endif // Q_OS_WIN
+
 void MainWindow::changeEvent(QEvent *event)
 {
     QWidget::changeEvent(event);

examples/mainwindow/mainwindow.h

@@ -41,6 +41,9 @@ protected:
     void showEvent(QShowEvent *event) override;
     void paintEvent(QPaintEvent *event) override;
     void changeEvent(QEvent *event) override;
+#ifdef Q_OS_WIN
+	bool nativeEvent(const QByteArray &eventType, void *message, long *result) override;
+#endif // Q_OS_WIN
 
 Q_SIGNALS:
     void windowStateChanged();

examples/widget/widget.cpp

@@ -334,6 +334,15 @@ bool Widget::nativeEvent(const QByteArray &eventType, void *message, qintptr *re
 bool Widget::nativeEvent(const QByteArray &eventType, void *message, long *result)
 #endif
 {
+#ifdef Q_OS_WIN
+    if (m_helper) {
+        if (m_helper->handleNativeEvent(this->windowHandle(), eventType, message, result))
+            return true;
+        else
+            return QWidget::nativeEvent(eventType, message, result);
+    }
+#endif
+
     if (message) {
         if (Utilities::isThemeChanged(message)) {
             updateStyleSheet();
@@ -349,5 +358,6 @@ bool Widget::nativeEvent(const QByteArray &eventType, void *message, long *resul
             }
         }
     }
+
     return QWidget::nativeEvent(eventType, message, result);
 }