make mainwindow derive from part and part the xmlwindow

first step to merging the two classes

src/mainWindow.cpp

@@ -58,12 +58,11 @@ namespace Filelight {
 
 MainWindow::MainWindow()
 //    : KParts::MainWindow()
-    : KXmlGuiWindow()
-    , m_part(new Part(nullptr, this, QList<QVariant>()))
+    : Part(nullptr, nullptr, QList<QVariant>())
+    , m_part(this)
     , m_histories(0)
 {
 //    setXMLFile("filelightui.rc");
-    m_part = static_cast<Part *>(new Part(nullptr, this, QList<QVariant>()));
 
     setStandardToolBarMenuEnabled(true);
     setupActions();

src/mainWindow.h

@@ -30,12 +30,13 @@ class KRecentFilesAction;
 
 class HistoryCollection;
 
+#include "part.h"
 
 namespace Filelight {
 
 class Part;
 
-class MainWindow : public KXmlGuiWindow // Maybe use qmainwindow
+class MainWindow : public Part // Maybe use qmainwindow
 {
     Q_OBJECT
 

src/part.cpp

@@ -58,7 +58,7 @@ BrowserExtension::BrowserExtension(Part *parent)
 
 Part::Part(QWidget *parentWidget, QObject *parent, const QList<QVariant>&)
 //        : ReadOnlyPart(parent)
-    : QObject(parent)
+    : KXmlGuiWindow(parentWidget)
         , m_summary(0)
         , m_ext(new BrowserExtension(this))
         , m_statusbar(new StatusBarExtension(this))
@@ -230,12 +230,6 @@ void Part::setUrl(const QUrl &url)
     m_url = url;
 }
 
-void Part::stateChanged(const QString &state)
-{
-#warning port this calls xmlguiclient::stateChanged in parts
-//    Q_ASSERT(false);
-}
-
 void Part::setWidget(QWidget *widget)
 {
     m_widget = widget;

src/part.h

@@ -27,6 +27,8 @@
 #include <KParts/Part>
 #include <QUrl>
 
+#include <KXmlGuiWindow>
+
 #include <QLabel>
 
 // COMPAT
@@ -76,7 +78,7 @@ signals:
 
 class Part : public
 //        KParts::ReadOnlyPart
-        QObject
+        KXmlGuiWindow
 {
     Q_OBJECT
 
@@ -132,7 +134,6 @@ public:
     QWidget *widget() const;
 private:
     void setUrl(const QUrl &url);
-    void stateChanged(const QString &state);
     void setWidget(QWidget *widget);
     QWidget *m_widget = nullptr;
     QUrl m_url;