fix tile properties

- make TileColumn read-only
- restrict TileRow to what is possible
- improve tooltips
- add button to flip the sides (the symbol is not mirrored, just flipped)

src/Mod/TechDraw/App/DrawTile.cpp

@@ -49,8 +49,17 @@ DrawTile::DrawTile(void)
 
     ADD_PROPERTY_TYPE(TileParent,(0),group,(App::PropertyType)(App::Prop_None),
                       "Object to which this tile is attached");
-    ADD_PROPERTY_TYPE(TileRow, (0), group, App::Prop_None, "Row in parent");
-    ADD_PROPERTY_TYPE(TileColumn, (0), group, App::Prop_None, "Column in parent");
+    ADD_PROPERTY_TYPE(TileRow, (0), group, App::Prop_None, "Row in parent object\n 0 for arrow side, -1 for other side");
+    ADD_PROPERTY_TYPE(TileColumn, (0), group, App::Prop_None, "Column in parent object");
+
+    // there is currently only one column, this don't allow to edit
+    TileColumn.setStatus(App::Property::ReadOnly, true);
+    // the row can only have the value 0 or -1
+    // allow its editing because this way the tiles can be flipped
+    TileRowConstraints.LowerBound = -1;
+    TileRowConstraints.UpperBound = 0;
+    TileRowConstraints.StepSize = 1;
+    TileRow.setConstraints(&TileRowConstraints);
 }
 
 DrawTile::~DrawTile()
@@ -77,6 +86,18 @@ App::DocumentObjectExecReturn *DrawTile::execute(void)
     return DocumentObject::execute();
 }
 
+void DrawTile::handleChangedPropertyType(Base::XMLReader &reader, const char *TypeName, App::Property *prop)
+// transforms properties that had been changed
+{
+    // property TileRow had App::PropertyInteger and was changed to App::PropertyIntegerConstraint
+    if (prop == &TileRow && strcmp(TypeName, "App::PropertyInteger") == 0) {
+        App::PropertyInteger TileRowProperty;
+        // restore the PropertyInteger to be able to set its value
+        TileRowProperty.Restore(reader);
+        TileRow.setValue(TileRowProperty.getValue());
+    }
+}
+
 DrawView* DrawTile::getParent(void) const
 {
 //    Base::Console().Message("DT::getParent() - %s\n", getNameInDocument());