eliminate global access to Octave interpreter in qt graphics classes Provide reference to interprerter to qt graphics classes to eliminate need for accessing it through a global variable. * qt-graphics-toolkit.cc (qt_graphics_toolkit::create_object): Pass m_interpreter to create functions for individual graphics objects. * BaseControl.h, BaseControl.cc, ButtonControl.h, ButtonControl.cc, ButtonGroup.h, ButtonGroup.cc, Canvas.h, Canvas.cc, CheckBoxControl.h, CheckBoxControl.cc, Container.h, Container.cc, ContextMenu.h, ContextMenu.cc, EditControl.h, EditControl.cc, Figure.h, Figure.cc, GLCanvas.h, GLCanvas.cc, ListBoxControl.h, ListBoxControl.cc, Menu.h, Menu.cc, Object.h, Object.cc, Panel.h, Panel.cc, PopupMenuControl.h, PopupMenuControl.cc, PushButtonControl.h, PushButtonControl.cc, PushTool.h, PushTool.cc, QtHandlesUtils.h, RadioButtonControl.h, RadioButtonControl.cc, SliderControl.h, SliderControl.cc, Table.h, Table.cc, TextControl.h, TextControl.cc, ToggleButtonControl.h, ToggleButtonControl.cc, ToggleTool.h, ToggleTool.cc, ToolBar.h, ToolBar.cc, ToolBarButton.h, ToolBarButton.cc: Accept reference to interpreter in create function and constructors for graphics objects. Eliminate global access to interpreter object and graphics_handle manager.

--- a/libgui/graphics/CheckBoxControl.cc	Tue Nov 05 18:23:20 2019 -0500
+++ b/libgui/graphics/CheckBoxControl.cc	Wed Nov 06 12:42:12 2019 -0500
@@ -36,24 +36,27 @@
 
   CheckBoxControl*
   CheckBoxControl::create (octave::base_qobject& oct_qobj,
+                           octave::interpreter& interp,
                            const graphics_object& go)
   {
-    Object *parent = Object::parentObject (go);
+    Object *parent = parentObject (interp, go);
 
     if (parent)
       {
         Container *container = parent->innerContainer ();
 
         if (container)
-          return new CheckBoxControl (oct_qobj, go, new QCheckBox (container));
+          return new CheckBoxControl (oct_qobj, interp, go,
+                                      new QCheckBox (container));
       }
 
     return nullptr;
   }
 
   CheckBoxControl::CheckBoxControl (octave::base_qobject& oct_obj,
+                                    octave::interpreter& interp,
                                     const graphics_object& go, QCheckBox *box)
-    : ButtonControl (oct_obj, go, box)
+    : ButtonControl (oct_obj, interp, go, box)
   {
     box->setAutoFillBackground (true);
   }