Clean up children on Page delete

src/Mod/TechDraw/App/DrawPage.cpp

@@ -66,6 +66,7 @@ const char* DrawPage::ProjectionTypeEnums[] = { "First Angle",
 DrawPage::DrawPage(void)
 {
     static const char *group = "Page";
+    nowDeleting = false;
 
     ADD_PROPERTY_TYPE(Template, (0), group, (App::PropertyType)(App::Prop_None), "Attached Template");
     ADD_PROPERTY_TYPE(Views, (0), group, (App::PropertyType)(App::Prop_None), "Attached Views");
@@ -101,11 +102,13 @@ void DrawPage::onBeforeChange(const App::Property* prop)
 void DrawPage::onChanged(const App::Property* prop)
 {
     if (prop == &Template) {
-        if (!isRestoring()) {
+        if (!isRestoring() &&
+            !isDeleting()) {
         //TODO: reload if Template prop changes (ie different Template)
         }
     } else if (prop == &Views) {
-        if (!isRestoring()) {
+        if (!isRestoring() &&
+            !isDeleting() ) {
             //TODO: reload if Views prop changes (ie adds/deletes)
         }
     } else if(prop == &Scale) {
@@ -130,7 +133,7 @@ void DrawPage::onChanged(const App::Property* prop)
       // TODO: Also update Template graphic.
 
     }
-    App::DocumentObject::onChanged(prop);
+    App::DocumentObject::onChanged(prop);  //<<<<
 }
 
 App::DocumentObjectExecReturn *DrawPage::execute(void)
@@ -302,3 +305,28 @@ void DrawPage::onDocumentRestored()
     recompute();
     App::DocumentObject::onDocumentRestored();
 }
+
+void DrawPage::unsetupObject()
+{
+    nowDeleting = true;
+
+    // Remove the Page's views & template from document
+    App::Document* doc = getDocument();
+    std::string docName = doc->getName();
+
+    const std::vector<App::DocumentObject*> currViews = Views.getValues();
+    std::vector<App::DocumentObject*> emptyViews;
+    std::vector<App::DocumentObject*>::const_iterator it = currViews.begin();
+    for (; it != currViews.end(); it++) {
+        std::string viewName = (*it)->getNameInDocument();
+        Base::Interpreter().runStringArg("App.getDocument(\"%s\").removeObject(\"%s\")",
+                                          docName.c_str(), viewName.c_str());
+    }
+    Views.setValues(emptyViews);
+
+    std::string templateName = Template.getValue()->getNameInDocument();
+    Base::Interpreter().runStringArg("App.getDocument(\"%s\").removeObject(\"%s\")",
+                                          docName.c_str(), templateName.c_str());
+    Template.setValue(nullptr);
+}
+

src/Mod/TechDraw/App/DrawPage.h

@@ -81,14 +81,20 @@ public:
      */
     double getPageHeight() const;
     const char* getPageOrientation() const;
+    bool isDeleting(void) { return nowDeleting; }
+
 
 protected:
     void onBeforeChange(const App::Property* prop);
     void onChanged(const App::Property* prop);
     virtual void onDocumentRestored();
+    virtual void unsetupObject();
+
 
 private:
     static const char* ProjectionTypeEnums[];
+    bool nowDeleting;
+
 };
 
 } //namespace TechDraw

src/Mod/TechDraw/App/DrawViewPart.cpp

@@ -69,6 +69,7 @@
 #include <GeomLib_Tool.hxx>
 
 #include <App/Application.h>
+#include <App/Document.h>
 #include <Base/BoundBox.h>
 #include <Base/Console.h>
 #include <Base/Exception.h>
@@ -103,6 +104,7 @@ DrawViewPart::DrawViewPart(void) : geometryObject(0)
     static const char *group = "Projection";
     static const char *fgroup = "Format";
     static const char *sgroup = "Show";
+    nowDeleting = false;
 
     //properties that affect Geometry
     ADD_PROPERTY_TYPE(Source ,(0),group,App::Prop_None,"3D Shape to view");
@@ -577,6 +579,25 @@ bool DrawViewPart::showSectionEdges(void)
     return m_sectionEdges;
 }
 
+void DrawViewPart::unsetupObject()
+{
+    nowDeleting = true;
+
+    // Remove the View's Hatches from document
+    App::Document* doc = getDocument();
+    std::string docName = doc->getName();
+
+    std::vector<TechDraw::DrawHatch*> hatches = getHatches();
+
+    std::vector<TechDraw::DrawHatch*>::iterator it = hatches.begin();
+    for (; it != hatches.end(); it++) {
+        std::string viewName = (*it)->getNameInDocument();
+        Base::Interpreter().runStringArg("App.getDocument(\"%s\").removeObject(\"%s\")",
+                                          docName.c_str(), viewName.c_str());
+    }
+}
+
+
 PyObject *DrawViewPart::getPyObject(void)
 {
     if (PythonObject.is(Py::_None())) {

src/Mod/TechDraw/App/DrawViewPart.h

@@ -135,12 +135,15 @@ public:
     }
     //return PyObject as DrawViewPartPy
     virtual PyObject *getPyObject(void);
+    bool isDeleting(void) { return nowDeleting; }
 
 protected:
     TechDrawGeometry::GeometryObject *geometryObject;
     Base::BoundBox3d bbox;
 
     void onChanged(const App::Property* prop);
+    virtual void unsetupObject();
+
     virtual TechDrawGeometry::GeometryObject*  buildGeometryObject(TopoDS_Shape shape, gp_Ax2 viewAxis);
     void extractFaces();
 
@@ -156,6 +159,7 @@ protected:
     bool m_handleFaces;
 
 private:
+    bool nowDeleting;
 
 };
 

src/Mod/TechDraw/Gui/ViewProviderPage.cpp

@@ -127,11 +127,13 @@ void ViewProviderPage::hide(void)
 void ViewProviderPage::updateData(const App::Property* prop)
 {
     if (prop == &(getDrawPage()->Views)) {
-        if(m_mdiView) {
+        if(m_mdiView &&
+           !getDrawPage()->isDeleting()) {
             m_mdiView->updateDrawing();
         }
     } else if (prop == &(getDrawPage()->Template)) {
-       if(m_mdiView) {
+       if(m_mdiView && 
+          !getDrawPage()->isDeleting()) {
             m_mdiView->updateTemplate();
         }
     }