+ if(!selected_)
+ return false;
+ if(dragging_kf_time == selected_kf.get_time())
+ return false; // change this checking if not sticked to integer frames
+ Time selected_kf_time(selected_kf.get_time());
+ Time prev, next;
+ kf_list_->find_prev_next(selected_kf_time, prev, next);
+ // Not possible to set delta to the first keyframe
+ // perform normal movement
+ // As suggested by Zelgadis it is better to not perform anything.
+ if (prev==Time::begin() && delta==true)
+ {
+ synfig::info(_("Not possible to ALT-drag the first keyframe"));
+ return false;
+ }
+ if(!delta)
+ {
+ synfigapp::Action::Handle action(synfigapp::Action::create("KeyframeSet"));
+ if(!action)
+ return false;
+ selected_kf.set_time(dragging_kf_time);
+ action->set_param("canvas",canvas_interface_->get_canvas());
+ action->set_param("canvas_interface",canvas_interface_);
+ action->set_param("keyframe",selected_kf);
+ try
+ {
+ canvas_interface_->get_instance()->perform_action(action);
+ }
+ catch(...)
+ {
+ return false;
+ }
+ }
+ else
+ {
+ Keyframe prev_kf(*kf_list_->find_prev(selected_kf_time));
+ Time prev_kf_time(prev_kf.get_time());
+ if (prev_kf_time >= dragging_kf_time) //Not allowed
+ {
+ synfig::warning(_("Delta set not allowed"));
+ synfig::info(_("Widget_Keyframe_List::perform_move_kf(%i)::prev_kf_time=%s"), delta, prev_kf_time.get_string().c_str());
+ synfig::info(_("Widget_Keyframe_List::perform_move_kf(%i)::dragging_kf_time=%s"), delta, dragging_kf_time.get_string().c_str());
+ return false;
+ }
+ else
+ {
+ Time old_delta_time(selected_kf_time-prev_kf_time);
+ Time new_delta_time(dragging_kf_time-prev_kf_time);
+ Time change_delta(new_delta_time-old_delta_time);
+ synfigapp::Action::Handle action(synfigapp::Action::create("KeyframeSetDelta"));
+ if(!action)
+ return false;
+ action->set_param("canvas",canvas_interface_->get_canvas());
+ action->set_param("canvas_interface",canvas_interface_);
+ action->set_param("keyframe",prev_kf);
+ action->set_param("delta",change_delta);
+ canvas_interface_->get_instance()->perform_action(action);
+ }
+ }
+ queue_draw();
+ return true;