handle Leaders, Welds, Tiles and RichAnnos

src/Mod/TechDraw/Gui/ViewProviderLeader.cpp

@@ -25,6 +25,8 @@
 #include "PreCompiled.h"
 
 #ifndef _PreComp_
+# include <QMessageBox>
+# include <QTextStream>
 #endif
 
 #include <QMessageBox>
@@ -230,3 +232,34 @@ void ViewProviderLeader::handleChangedPropertyType(Base::XMLReader &reader, cons
     }
 }
 
+bool ViewProviderLeader::onDelete(const std::vector<std::string> &)
+{
+    // a leader line cannot be deleted if it has a child weld symbol
+
+    // get childs
+    auto childs = claimChildren();
+
+    if (!childs.empty()) {
+        QString bodyMessage;
+        QTextStream bodyMessageStream(&bodyMessage); 
+        bodyMessageStream << qApp->translate("Std_Delete",
+            "You cannot delete this leader line because\n it has a weld symbol that would become broken.");
+        QMessageBox::warning(Gui::getMainWindow(),
+            qApp->translate("Std_Delete", "Object dependencies"), bodyMessage,
+            QMessageBox::Ok);
+        return false;
+    }
+    else {
+        return true;
+    }
+}
+
+bool ViewProviderLeader::canDelete(App::DocumentObject *obj) const
+{
+    // deletions of Leader line objects don't destroy anything
+    // thus we can pass this action
+    // that the parent view cannot be deleted is handled
+    // in its onDelete() function
+    Q_UNUSED(obj)
+    return true;
+}

src/Mod/TechDraw/Gui/ViewProviderLeader.h

@@ -61,6 +61,8 @@ public:
     virtual bool setEdit(int ModNum);
     virtual void unsetEdit(int ModNum);
     virtual bool doubleClicked(void);
+    virtual bool onDelete(const std::vector<std::string> &);
+    virtual bool canDelete(App::DocumentObject* obj) const;
 
     std::vector<App::DocumentObject*> claimChildren(void) const;
 

src/Mod/TechDraw/Gui/ViewProviderProjGroupItem.cpp

@@ -168,6 +168,7 @@ bool ViewProviderProjGroupItem::onDelete(const std::vector<std::string> &)
     // get child views
     auto viewSection = getObject()->getSectionRefs();
     auto viewDetail = getObject()->getDetailRefs();
+    auto viewLeader = getObject()->getLeaders();
 
    if (isAnchor)
    {
@@ -196,6 +197,14 @@ bool ViewProviderProjGroupItem::onDelete(const std::vector<std::string> &)
            QMessageBox::Ok);
        return false;
    }
+   else if (!viewLeader.empty()) {
+       bodyMessageStream << qApp->translate("Std_Delete",
+           "You cannot delete this view because it has a leader line that would become broken.");
+       QMessageBox::warning(Gui::getMainWindow(),
+           qApp->translate("Std_Delete", "Object dependencies"), bodyMessage,
+           QMessageBox::Ok);
+       return false;
+   }
    else {
         return true;
    }

src/Mod/TechDraw/Gui/ViewProviderRichAnno.cpp

@@ -221,3 +221,12 @@ void ViewProviderRichAnno::handleChangedPropertyType(Base::XMLReader &reader, co
     }
 }
 
+bool ViewProviderRichAnno::canDelete(App::DocumentObject *obj) const
+{
+    // deletions of RichAnno objects don't destroy anything
+    // thus we can pass this action
+    // only for information: RichAnnos that have a parent
+    // view will get the page as new parent if the view is deleted
+    Q_UNUSED(obj)
+    return true;
+}

src/Mod/TechDraw/Gui/ViewProviderRichAnno.h

@@ -58,6 +58,7 @@ public:
     virtual bool setEdit(int ModNum);
     virtual void unsetEdit(int ModNum);
     virtual bool doubleClicked(void);
+    virtual bool canDelete(App::DocumentObject* obj) const;
 
     virtual TechDraw::DrawRichAnno* getViewObject() const;
     TechDraw::DrawRichAnno* getFeature()  const;
@@ -72,7 +73,6 @@ protected:
 private:
     static App::PropertyIntegerConstraint::Constraints LineStyleRange;
 
-
 };
 
 } // namespace TechDrawGui

src/Mod/TechDraw/Gui/ViewProviderTile.cpp

@@ -84,6 +84,16 @@ void ViewProviderTile::updateData(const App::Property* prop)
 //    return dynamic_cast<TechDraw::DrawTile*>(pcObject);
 //}
 
+bool ViewProviderTile::canDelete(App::DocumentObject *obj) const
+{
+    // deletions of Tile objects don't destroy anything
+    // thus we can pass this action
+    // that the deletion of its parent weld symbol is not possible
+    // is done in its onDelete() function
+    Q_UNUSED(obj)
+    return true;
+}
+
 TechDraw::DrawTile* ViewProviderTile::getFeature() const
 {
     return dynamic_cast<TechDraw::DrawTile*>(pcObject);

src/Mod/TechDraw/Gui/ViewProviderTile.h

@@ -48,6 +48,7 @@ public:
     /// returns a list of all possible modes
     virtual std::vector<std::string> getDisplayModes(void) const;
     virtual void updateData(const App::Property*);
+    virtual bool canDelete(App::DocumentObject *obj) const;
 
 /*    virtual TechDraw::DrawTile* getViewObject() const;*/
     virtual TechDraw::DrawTile* getFeature() const;

src/Mod/TechDraw/Gui/ViewProviderViewPart.cpp

@@ -260,6 +260,7 @@ bool ViewProviderViewPart::onDelete(const std::vector<std::string> &)
     // get child views
     auto viewSection = getViewObject()->getSectionRefs();
     auto viewDetail = getViewObject()->getDetailRefs();
+    auto viewLeader = getViewObject()->getLeaders();
     
     if (!viewSection.empty()) {
         bodyMessageStream << qApp->translate("Std_Delete",
@@ -277,6 +278,14 @@ bool ViewProviderViewPart::onDelete(const std::vector<std::string> &)
             QMessageBox::Ok);
         return false;
     }
+    else if (!viewLeader.empty()) {
+        bodyMessageStream << qApp->translate("Std_Delete",
+            "You cannot delete this view because it has a leader line that would become broken.");
+        QMessageBox::warning(Gui::getMainWindow(),
+            qApp->translate("Std_Delete", "Object dependencies"), bodyMessage,
+            QMessageBox::Ok);
+        return false;
+    }
     else {
         return true;
     }

src/Mod/TechDraw/Gui/ViewProviderWeld.cpp

@@ -24,6 +24,8 @@
 #include "PreCompiled.h"
 
 #ifndef _PreComp_
+# include <QMessageBox>
+# include <QTextStream>
 #endif
 
 /// Here the FreeCAD includes sorted by Base,App,Gui......
@@ -94,14 +96,14 @@ void ViewProviderWeld::updateData(const App::Property* prop)
     ViewProviderDrawingView::updateData(prop);
 }
 
-void ViewProviderWeld::onChanged(const App::Property* p)
-{
-    QGIView* qgiv = getQView();
-    if (qgiv) {
-        qgiv->updateView(true);
-    }
-
-    ViewProviderDrawingView::onChanged(p);
+void ViewProviderWeld::onChanged(const App::Property* p)
+{
+    QGIView* qgiv = getQView();
+    if (qgiv) {
+        qgiv->updateView(true);
+    }
+
+    ViewProviderDrawingView::onChanged(p);
 }
 
 std::vector<App::DocumentObject*> ViewProviderWeld::claimChildren(void) const
@@ -186,7 +188,37 @@ double ViewProviderWeld::prefTileTextAdjust(void)
     return adjust;
 }
 
+bool ViewProviderWeld::onDelete(const std::vector<std::string> &)
+{
+    // a weld cannot be deleted if it has a tile
+
+    // get childs
+    auto childs = claimChildren();
+
+    if (!childs.empty()) {
+        QString bodyMessage;
+        QTextStream bodyMessageStream(&bodyMessage);
+        bodyMessageStream << qApp->translate("Std_Delete",
+            "You cannot delete this weld symbol because\n it has a tile weld that would become broken.");
+        QMessageBox::warning(Gui::getMainWindow(),
+            qApp->translate("Std_Delete", "Object dependencies"), bodyMessage,
+            QMessageBox::Ok);
+        return false;
+    }
+    else {
+        return true;
+    }
+}
 
+bool ViewProviderWeld::canDelete(App::DocumentObject *obj) const
+{
+    // deletions of Weld objects don't destroy anything
+    // thus we can pass this action
+    // that the parent LeaderLine cannot be deleted is handled
+    // in its onDelete() function
+    Q_UNUSED(obj)
+    return true;
+}
 
 TechDraw::DrawWeldSymbol* ViewProviderWeld::getViewObject() const
 {

src/Mod/TechDraw/Gui/ViewProviderWeld.h

@@ -67,7 +67,8 @@ public:
     std::string prefFontName(void);
     double prefFontSize(void);
     double prefTileTextAdjust(void);
-
+    virtual bool onDelete(const std::vector<std::string> &);
+    virtual bool canDelete(App::DocumentObject* obj) const;
     
 };