+ Support preference pages for Python widget class

src/Gui/ApplicationPy.cpp

@@ -532,20 +532,31 @@ PyObject* Application::sCreateDialog(PyObject * /*self*/, PyObject *args,PyObjec
 PyObject* Application::sAddPreferencePage(PyObject * /*self*/, PyObject *args,PyObject * /*kwd*/)
 {
     char *fn, *grp;
-    if (!PyArg_ParseTuple(args, "ss", &fn,&grp))     // convert args: Python->C 
-        return NULL;                                      // NULL triggers exception 
+    if (PyArg_ParseTuple(args, "ss", &fn,&grp)) {
+        QFileInfo fi(QString::fromUtf8(fn));
+        if (!fi.exists()) {
+            PyErr_SetString(PyExc_RuntimeError, "UI file does not exist");
+            return 0;
+        }
 
-    QFileInfo fi(QString::fromUtf8(fn));
-    if (!fi.exists()) {
-        PyErr_SetString(PyExc_RuntimeError, "UI file does not exist");
-        return 0;
+        // add to the preferences dialog
+        new PrefPageUiProducer(fn, grp);
+
+        Py_INCREF(Py_None);
+        return Py_None;
     }
+    PyErr_Clear();
 
-    // add to the preferences dialog
-    new PrefPageUiProducer(fn, grp);
+    PyObject* dlg;
+    if (PyArg_ParseTuple(args, "O!s", &PyClass_Type, &dlg, &grp)) {
+        // add to the preferences dialog
+        new PrefPagePyProducer(Py::Object(dlg), grp);
 
-    Py_INCREF(Py_None);
-    return Py_None;
+        Py_INCREF(Py_None);
+        return Py_None;
+    }
+
+    return 0;
 }
 
 PyObject* Application::sActivateWorkbenchHandler(PyObject * /*self*/, PyObject *args,PyObject * /*kwd*/)

src/Gui/WidgetFactory.cpp

@@ -729,6 +729,106 @@ void* PrefPageUiProducer::Produce () const
 
 // ----------------------------------------------------
 
+PrefPagePyProducer::PrefPagePyProducer (const Py::Object& p, const char* group)
+  : type(p)
+{
+    std::string str;
+    Base::PyGILStateLocker lock;
+    if (type.hasAttr("__name__")) {
+        str = static_cast<std::string>(Py::String(type.getAttr("__name__")));
+    }
+
+    WidgetFactoryInst::instance().AddProducer(str.c_str(), this);
+    Gui::Dialog::DlgPreferencesImp::addPage(str, group);
+}
+
+PrefPagePyProducer::~PrefPagePyProducer ()
+{
+    Base::PyGILStateLocker lock;
+    type = Py::None();
+}
+
+void* PrefPagePyProducer::Produce () const
+{
+    Base::PyGILStateLocker lock;
+    Py::Callable method(type);
+    Py::Tuple args;
+    Py::Object page = method.apply(args);
+    return new Gui::Dialog::PreferencePagePython(page);
+}
+
+// ----------------------------------------------------
+
+using namespace Gui::Dialog;
+
+PreferencePagePython::PreferencePagePython(const Py::Object& p, QWidget* parent)
+  : PreferencePage(parent), page(p)
+{
+    Base::PyGILStateLocker lock;
+    if (page.hasAttr(std::string("form"))) {
+        Py::Object widget(page.getAttr(std::string("form")));
+
+        Gui::PythonWrapper wrap;
+        if (wrap.loadCoreModule()) {
+            QObject* object = wrap.toQObject(widget);
+            if (object) {
+                QWidget* form = qobject_cast<QWidget*>(object);
+                if (form) {
+                    this->setWindowTitle(form->windowTitle());
+                    QVBoxLayout *layout = new QVBoxLayout;
+                    layout->addWidget(form);
+                    setLayout(layout);
+                }
+            }
+        }
+    }
+}
+
+PreferencePagePython::~PreferencePagePython()
+{
+    Base::PyGILStateLocker lock;
+    page = Py::None();
+}
+
+void PreferencePagePython::changeEvent(QEvent *e)
+{
+    QWidget::changeEvent(e);
+}
+
+void PreferencePagePython::loadSettings()
+{
+    Base::PyGILStateLocker lock;
+    try {
+        if (page.hasAttr(std::string("loadSettings"))) {
+            Py::Callable method(page.getAttr(std::string("loadSettings")));
+            Py::Tuple args;
+            method.apply(args);
+        }
+    }
+    catch (Py::Exception&) {
+        Base::PyException e; // extract the Python error text
+        e.ReportException();
+    }
+}
+
+void PreferencePagePython::saveSettings()
+{
+    Base::PyGILStateLocker lock;
+    try {
+        if (page.hasAttr(std::string("saveSettings"))) {
+            Py::Callable method(page.getAttr(std::string("saveSettings")));
+            Py::Tuple args;
+            method.apply(args);
+        }
+    }
+    catch (Py::Exception&) {
+        Base::PyException e; // extract the Python error text
+        e.ReportException();
+    }
+}
+
+// ----------------------------------------------------
+
 /* TRANSLATOR Gui::ContainerDialog */
 
 /**

src/Gui/WidgetFactory.h

@@ -236,6 +236,28 @@ class GuiExport PrefPageUiProducer : public Base::AbstractProducer
     QString fn;
 };
 
+/**
+ * The PrefPagePyProducer class provides the ability to create preference pages
+ * dynamically from a Python class.
+ * @author Werner Mayer
+ */
+class GuiExport PrefPagePyProducer : public Base::AbstractProducer
+{
+public:
+    /** 
+     * Register a special type of preference page to the WidgetFactoryInst.
+     */
+    PrefPagePyProducer (const Py::Object&, const char* group);
+    virtual ~PrefPagePyProducer ();
+    /**
+     * Creates an instance of the specified widget.
+     */
+    virtual void* Produce () const;
+
+private:
+    Py::Object type;
+};
+
 // --------------------------------------------------------------------
 
 /**
@@ -435,6 +457,32 @@ public Q_SLOTS:
     QObject*  mySender;
 };
 
+// ----------------------------------------------------
+namespace Dialog {
+
+/** Subclass that embeds a form from a Python class.
+ * \author Werner Mayer
+ */
+class GuiExport PreferencePagePython : public PreferencePage
+{
+    Q_OBJECT
+
+public:
+    PreferencePagePython(const Py::Object& dlg, QWidget* parent = 0);
+    virtual ~PreferencePagePython();
+
+    void loadSettings();
+    void saveSettings();
+
+protected:
+    void changeEvent(QEvent *e);
+
+private:
+    Py::Object page;
+};
+
+} // namespace Dialog
+
 } // namespace Gui
 
 #endif // GUI_WIDGETFACTORY_H