Gui: add MDIViewPy.cast_to_base and implement in Python wrappers for sub-classes of MDIView

src/Gui/MDIViewPy.cpp

@@ -53,6 +53,7 @@ void MDIViewPy::init_type()
     behaviors().supportRepr();
     behaviors().supportGetattr();
     behaviors().supportSetattr();
+    behaviors().set_tp_new(extension_object_new);
 
     add_varargs_method("message",&MDIViewPy::sendMessage,"deprecated: use sendMessage");
     add_varargs_method("sendMessage",&MDIViewPy::sendMessage,"sendMessage(str)");
@@ -60,6 +61,26 @@ void MDIViewPy::init_type()
     add_varargs_method("fitAll",&MDIViewPy::fitAll,"fitAll()");
     add_varargs_method("setActiveObject", &MDIViewPy::setActiveObject, "setActiveObject(name,object,subname=None)\nadd or set a new active object");
     add_varargs_method("getActiveObject", &MDIViewPy::getActiveObject, "getActiveObject(name,resolve=True)\nreturns the active object for the given type");
+    add_varargs_method("cast_to_base", &MDIViewPy::cast_to_base, "cast_to_base() cast to MDIView class");
+}
+
+PyObject *MDIViewPy::extension_object_new(struct _typeobject * /*type*/, PyObject * /*args*/, PyObject * /*kwds*/)
+{
+    return new MDIViewPy(nullptr);
+}
+
+Py::Object MDIViewPy::type()
+{
+    return Py::Object( reinterpret_cast<PyObject *>( behaviors().type_object() ) );
+}
+
+Py::ExtensionObject<MDIViewPy> MDIViewPy::create(MDIView *mdi)
+{
+    Py::Callable class_type(type());
+    Py::Tuple arg;
+    auto inst = Py::ExtensionObject<MDIViewPy>(class_type.apply(arg, Py::Dict()));
+    inst.extensionObject()->_view = mdi;
+    return inst;
 }
 
 MDIViewPy::MDIViewPy(MDIView *mdi)
@@ -198,3 +219,8 @@ Py::Object MDIViewPy::getActiveObject(const Py::Tuple& args)
             Py::asObject(parent->getPyObject()),
             Py::String(subname.c_str()));
 }
+
+Py::Object MDIViewPy::cast_to_base(const Py::Tuple&)
+{
+    return Py::Object(this);
+}

src/Gui/MDIViewPy.h

@@ -35,7 +35,11 @@ class MDIView;
 class GuiExport MDIViewPy : public Py::PythonExtension<MDIViewPy>
 {
 public:
-    static void init_type(void);    // announce properties and methods
+    static void init_type();    // announce properties and methods
+    static PyObject *extension_object_new( PyTypeObject *subtype, PyObject * /*args*/, PyObject * /*kwds*/ );
+
+    static Py::Object type();
+    static Py::ExtensionObject<MDIViewPy> create(MDIView *mdi);
 
     MDIViewPy(MDIView *mdi);
     ~MDIViewPy();
@@ -47,6 +51,7 @@ public:
     Py::Object fitAll(const Py::Tuple&);
     Py::Object setActiveObject(const Py::Tuple&);
     Py::Object getActiveObject(const Py::Tuple&);
+    Py::Object cast_to_base(const Py::Tuple&);
 
     MDIView* getMDIViewPtr() {return _view.data();}
 

src/Gui/View3DPy.cpp

@@ -52,6 +52,7 @@
 #include "View3DViewerPy.h"
 #include "ActiveObjectList.h"
 #include "PythonWrapper.h"
+#include "MDIViewPy.h"
 
 
 #include <Base/Console.h>
@@ -208,6 +209,7 @@ void View3DInventorPy::init_type()
         "hasClippingPlane(): check whether this clipping plane is active");
     add_varargs_method("graphicsView",&View3DInventorPy::graphicsView,
         "graphicsView(): Access this view as QGraphicsView");
+    add_varargs_method("cast_to_base", &View3DInventorPy::cast_to_base, "cast_to_base() cast to MDIView class");
 }
 
 View3DInventorPy::View3DInventorPy(View3DInventor *vi)
@@ -2633,3 +2635,8 @@ Py::Object View3DInventorPy::graphicsView(const Py::Tuple& args)
     wrap.loadWidgetsModule();
     return wrap.fromQWidget(_view->getViewer(), "QGraphicsView");
 }
+
+Py::Object View3DInventorPy::cast_to_base(const Py::Tuple&)
+{
+    return Gui::MDIViewPy::create(_view);
+}

src/Gui/View3DPy.h

@@ -135,6 +135,7 @@ public:
     Py::Object toggleClippingPlane(const Py::Tuple& args, const Py::Dict &);
     Py::Object hasClippingPlane(const Py::Tuple& args);
     Py::Object graphicsView(const Py::Tuple& args);
+    Py::Object cast_to_base(const Py::Tuple&);
 
     View3DInventor* getView3DIventorPtr() {return _view;}
 

src/Mod/Spreadsheet/Gui/SpreadsheetView.cpp

@@ -471,6 +471,7 @@ void SheetViewPy::init_type()
     behaviors().supportSetattr();
 
     add_varargs_method("getSheet", &SheetViewPy::getSheet, "getSheet()");
+    add_varargs_method("cast_to_base", &SheetViewPy::cast_to_base, "cast_to_base() cast to MDIView class");
     behaviors().readyType();
 }
 
@@ -531,4 +532,9 @@ Py::Object SheetViewPy::getSheet(const Py::Tuple& args)
     return Py::asObject(new Spreadsheet::SheetPy(getSheetViewPtr()->getSheet()));
 }
 
+Py::Object SheetViewPy::cast_to_base(const Py::Tuple&)
+{
+    return Gui::MDIViewPy::create(base.getMDIViewPtr());
+}
+
 #include "moc_SpreadsheetView.cpp"

src/Mod/Spreadsheet/Gui/SpreadsheetView.h

@@ -130,6 +130,7 @@ public:
     Py::Object repr();
     Py::Object getattr(const char *);
     Py::Object getSheet(const Py::Tuple&);
+    Py::Object cast_to_base(const Py::Tuple&);
 
     SheetView* getSheetViewPtr();