Allow the use of horizontal scrolling to adjust the current time in timeslider widget...

git-svn-id: http://svn.voria.com/code@1221 1f10aa63-cdf2-0310-b900-c93c546f37ac

diff --git a/synfig-studio/trunk/src/gtkmm/widget_timeslider.cpp b/synfig-studio/trunk/src/gtkmm/widget_timeslider.cpp
index 4b87f3a..651cbe0 100644 (file)
--- a/synfig-studio/trunk/src/gtkmm/widget_timeslider.cpp
+++ b/synfig-studio/trunk/src/gtkmm/widget_timeslider.cpp
@@ -707,7 +707,42 @@ bool Widget_Timeslider::on_scroll_event(GdkEventScroll* event) //for zooming
 
                        return true;
                }
+               
+               case GDK_SCROLL_RIGHT:
+               case GDK_SCROLL_LEFT:
+               {       
+                       double t = adj_timescale->get_value();
+                       double start = adj_timescale->get_lower();
+                       double end = adj_timescale->get_upper();
+                       /*
+                       FIXME: be more intelligent about how far to scroll
+                       Perhaps it should be based on the tickmarks?
+                       for e.g. 1/4 of a tick mark per scroll event
+                       Obviously this  would need post-rounding to 1/fps
+                       */
+                       double adj = 1.0/fps;
+
+                       if( event->direction == GDK_SCROLL_RIGHT )
+                               t += adj;
+                       else
+                               t -= adj;
+
+                       if( t < start ){
+                               adj_timescale->set_lower(t);
+                               adj_timescale->set_upper(t+end-start);
+                       } else if( t > end ){ 
+                               adj_timescale->set_upper(t);
+                               adj_timescale->set_lower(t-end+start);
+                       }
 
+                       if(adj_timescale)
+                       {
+                               adj_timescale->set_value(t);
+                               adj_timescale->value_changed();
+                       }
+                       return true;
+               }
+               
                default:
                {
                        return false;