hover effect in a treeview

[todd <toddf simosoftware com>]

Hi,
   I'm trying to add a hover effect to a treeview, without using the 
selection, because I use the selection to indicate which row
the user is currently using.  So, I have it working; but it uses more 
cpu power then I'd like.  Heres a the mouse motion routine:

The commented out section is how one thing I tried to do to only update 
part of the widget.

// connected to motion-notify-event
static void
sidebar_highlight( GtkWidget *widget, GdkEventMotion *event, SimoSidebar 
*sidebar )
{
 gint x, y;
 GdkWindow *window = gtk_tree_view_get_bin_window( sidebar->view );
 x = event->x;
 y = event->y;
 if( window == event->window ){
   /*GdkRectangle cell_area;

   gtk_cell_renderer_get_size( sidebar->cell_renderer,
                               GTK_WIDGET( sidebar->view ),
                               &cell_area, 0, 0, 0, 0 );
   cell_area.x = x;
   cell_area.y = y;
   //gdk_window_invalidate_rect( window, &cell_area, 0 );
   g_print( "update region: %d, %d\n", x, y );
   gtk_widget_queue_draw_area(
     GTK_WIDGET( sidebar->view ),
     cell_area.x, cell_area.y, cell_area.width + 100,
     cell_area.height + 100 );*/
     gtk_widget_queue_draw( GTK_WIDGET( sidebar->view ) );
 }
}
// connected leave-notify-event
static void
mouse_leave( GtkWidget *widget, GdkEvent *event, SimoSidebar *sidebar )
{
 gtk_widget_queue_draw( GTK_WIDGET( sidebar->view ) );
}

This triggers a cell renderer data function I connected to a column

static void
name_column_render( GtkTreeViewColumn *col, GtkCellRenderer *cell,
                                       GtkTreeModel *model, GtkTreeIter 
*iter, SimoSidebar *sidebar )
{
   int val;
 GtkTreePath *cur_path;
 GtkTreeViewColumn *cur_col;

 //gtk_tree_view_get_cursor( sidebar->view, &cur_path, &cur_col );


   gtk_tree_model_get( model, iter, COL_TYPE, &val, -1 );

   switch( val ){
   case SIDEBAR_PEOPLE:
   case SIDEBAR_PROVIDERS:
   case SIDEBAR_PHARMACIES:
   case SIDEBAR_PLANS:
   case SIDEBAR_FLEX_SPENDING:
   case SIDEBAR_MEDICAL_SAVINGS:
       g_object_set( G_OBJECT( cell ), //"cell-background", "#ececee",
                                                                       
//"cell-background-set", TRUE,
                                                                       
"weight-set", TRUE,
                                                                       
"foreground", "white",
                                                                       
"foreground-set", TRUE,
                                                                       
"size-points", (double)8,
                                                                       
NULL );
       break;
   case SIDEBAR_GROUP:
       g_object_set( G_OBJECT( cell ), //"cell-background",
                                                                       
//"#7788ee", "cell-background-set", TRUE,
                                                                       
"weight", 500,
                                                                       
"weight-set", TRUE,
                                                                       
"foreground", "#34547b",
                                                                       
"foreground-set", TRUE,
                                                                       
"size-points", (double)9,
                                                                       
NULL );
       break;
   case SIDEBAR_PROVIDER_HEADER:
   case SIDEBAR_PHARMACY_HEADER:
   case SIDEBAR_PLAN_HEADER:
   case SIDEBAR_FLEX_SPENDING_HEADER:
   case SIDEBAR_MEDICAL_SAVINGS_HEADER:
   case SIDEBAR_PEOPLE_HEADER:
       g_object_set( G_OBJECT( cell ), //"cell-background", "#4362c5",
                                                                       
//"cell-background-set", TRUE,
                                                                       
"weight", 1000,
                                                                       
"weight-set", TRUE,
                                                                       
"foreground", "#123259",//"#34547b",
                                                                       
"foreground-set", TRUE,
                                                                       
"size-points", (double)9,
//                                                                    
   "size-set", TRUE,
                                                                       
NULL );
       break;
   }

// highlight the row with the mouse over it
 gint x, y;
 GdkWindow *window = gtk_tree_view_get_bin_window( sidebar->view );
 gdk_window_get_pointer( window, &x, &y, 0 );

 if( gtk_tree_view_get_path_at_pos( sidebar->view, x, y,
                                    &cur_path, &cur_col, 0, 0 ) ){
   if( cur_col == col ){
     GtkTreePath *rpath = gtk_tree_model_get_path( model, iter );
     if( !gtk_tree_path_compare( cur_path, rpath ) ){
       //g_print( "render column: SET FOREGROUND COLOR\n" );
       g_object_set( G_OBJECT( cell ), "foreground", "#F4547b", 0 );
     }
     else{
     }
     if( rpath )
       gtk_tree_path_free( rpath );
   }
   gtk_tree_path_free( cur_path );
 }
 else{
  // g_print( "cur path is null\n" );
 }
}

any thoughts or comments on how to make this work a little more 
efficently would be welcome :-)

-todd