gtk3: implement tree header bar area

Change-Id: I9f4ef42eb35524714a170e9f4a4d5ef13e198efd

vcl/inc/unx/gtk/gtkgdi.hxx

@@ -88,6 +88,7 @@ private:
     static GtkStyleContext *mpFrameOutStyle;
     static GtkStyleContext *mpFixedHoriLineStyle;
     static GtkStyleContext *mpFixedVertLineStyle;
+    static GtkStyleContext *mpTreeHeaderButtonStyle;
 
     static Rectangle NWGetScrollButtonRect( ControlPart nPart, Rectangle aAreaRect );
     static Rectangle NWGetSpinButtonRect( ControlPart nPart, Rectangle aAreaRect);

vcl/unx/gtk3/gdi/gtk3salnativewidgets-gtk.cxx

@@ -44,6 +44,7 @@ GtkStyleContext* GtkSalGraphics::mpFrameInStyle = NULL;
 GtkStyleContext* GtkSalGraphics::mpFrameOutStyle = NULL;
 GtkStyleContext* GtkSalGraphics::mpFixedHoriLineStyle = NULL;
 GtkStyleContext* GtkSalGraphics::mpFixedVertLineStyle = NULL;
+GtkStyleContext* GtkSalGraphics::mpTreeHeaderButtonStyle = NULL;
 
 bool GtkSalGraphics::style_loaded = false;
 /************************************************************************
@@ -814,6 +815,7 @@ static GtkWidget* gFrameIn;
 static GtkWidget* gFrameOut;
 static GtkWidget* gMenuBarWidget;
 static GtkWidget* gMenuItemMenuBarWidget;
+static GtkWidget* gTreeViewWidget;
 
 bool GtkSalGraphics::drawNativeControl( ControlType nType, ControlPart nPart, const Rectangle& rControlRegion,
                                             ControlState nState, const ImplControlValue& rValue,
@@ -987,6 +989,10 @@ bool GtkSalGraphics::drawNativeControl( ControlType nType, ControlPart nPart, co
     case CTRL_FIXEDLINE:
         context = nPart == PART_SEPARATOR_HORZ ? mpFixedHoriLineStyle : mpFixedVertLineStyle;
         renderType = RENDER_SEPERATOR;
+        break;
+    case CTRL_LISTHEADER:
+        context = mpTreeHeaderButtonStyle;
+        break;
     default:
         return false;
     }
@@ -1789,10 +1795,10 @@ bool GtkSalGraphics::IsNativeControlSupported( ControlType nType, ControlPart nP
                 return true;
             break;
 
-//        case CTRL_LISTHEADER:
-//            if(nPart == PART_BUTTON || nPart == PART_ARROW)
-//                return true;
-//            break;
+        case CTRL_LISTHEADER:
+            if (nPart == PART_BUTTON /*|| nPart == PART_ARROW*/)
+                return true;
+            break;
     }
 
     printf( "Unhandled is native supported for Type: %d, Part %d\n",
@@ -1984,6 +1990,27 @@ GtkSalGraphics::GtkSalGraphics( GtkSalFrame *pFrame, GtkWidget *pWindow )
     getStyleContext(&mpFixedHoriLineStyle, gtk_separator_new(GTK_ORIENTATION_HORIZONTAL));
     getStyleContext(&mpFixedVertLineStyle, gtk_separator_new(GTK_ORIENTATION_VERTICAL));
 
+
+    /* Tree List */
+    gTreeViewWidget = gtk_tree_view_new();
+    gtk_container_add(GTK_CONTAINER(gDumbContainer), gTreeViewWidget);
+
+    GtkTreeViewColumn* firstTreeViewColumn = gtk_tree_view_column_new();
+    gtk_tree_view_column_set_title(firstTreeViewColumn, "M");
+    gtk_tree_view_append_column(GTK_TREE_VIEW(gTreeViewWidget), firstTreeViewColumn);
+
+    GtkTreeViewColumn* middleTreeViewColumn = gtk_tree_view_column_new();
+    gtk_tree_view_column_set_title(middleTreeViewColumn, "M");
+    gtk_tree_view_append_column(GTK_TREE_VIEW(gTreeViewWidget), middleTreeViewColumn);
+
+    GtkTreeViewColumn* lastTreeViewColumn = gtk_tree_view_column_new();
+    gtk_tree_view_column_set_title(lastTreeViewColumn, "M");
+    gtk_tree_view_append_column(GTK_TREE_VIEW(gTreeViewWidget), lastTreeViewColumn);
+
+    /* Use the middle column's header for our button */
+    GtkWidget* pTreeHeaderCellWidget = gtk_tree_view_column_get_button(middleTreeViewColumn);
+    mpTreeHeaderButtonStyle = gtk_widget_get_style_context(pTreeHeaderCellWidget);
+
     gtk_widget_show_all(gDumbContainer);
 }