[glom/gtkmm4v4: 18/37] gtkmm4: FlowTable: Derive from WidgetCustomDraw

[Murray Cumming <murrayc src gnome org>]

commit b423eca6309f3dd4857b9e472d2a940a4a2ce820
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Mar 14 09:43:10 2017 +0100

    gtkmm4: FlowTable: Derive from WidgetCustomDraw
    
    Now necessary if we want an on_draw() to override.

 glom/utility_widgets/flowtable.cc |    2 ++
 glom/utility_widgets/flowtable.h  |    5 ++++-
 2 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/glom/utility_widgets/flowtable.cc b/glom/utility_widgets/flowtable.cc
index acf3b72..3b8087f 100644
--- a/glom/utility_widgets/flowtable.cc
+++ b/glom/utility_widgets/flowtable.cc
@@ -29,6 +29,8 @@ namespace Glom
 {
 
 FlowTable::FlowTable()
+: Glib::ObjectBase("flowtable"),
+  Gtk::WidgetCustomDraw();
 : m_design_mode(false)
 {
   //Default to disabling drag and drop:
diff --git a/glom/utility_widgets/flowtable.h b/glom/utility_widgets/flowtable.h
index 67053b2..2677bcc 100644
--- a/glom/utility_widgets/flowtable.h
+++ b/glom/utility_widgets/flowtable.h
@@ -24,11 +24,14 @@
 #include <glom/utility_widgets/eggspreadtablemm/eggspreadtabledndmm.h>
 #include "layoutwidgetbase.h"
 #include <gtkmm/box.h>
+#include <gtkmm/widgetcustomdraw.h>
 
 namespace Glom
 {
 
-class FlowTable : public Egg::SpreadTableDnd
+class FlowTable
+: public Gtk::WidgetCustomDraw,
+  public Egg::SpreadTableDnd
 {
 public:
   FlowTable();