implemented the ability to modify bezier points in the curve editor

app/widget/keyframeview/keyframeviewundo.cpp

@@ -17,3 +17,31 @@ void KeyframeSetTypeCommand::undo()
 {
   key_->set_type(old_type_);
 }
+
+KeyframeSetBezierControlPoint::KeyframeSetBezierControlPoint(NodeKeyframePtr key, NodeKeyframe::BezierType mode, const QPointF& point, QUndoCommand *parent) :
+  QUndoCommand(parent),
+  key_(key),
+  mode_(mode),
+  old_point_(key->bezier_control(mode_)),
+  new_point_(point)
+{
+}
+
+KeyframeSetBezierControlPoint::KeyframeSetBezierControlPoint(NodeKeyframePtr key, NodeKeyframe::BezierType mode, const QPointF &new_point, const QPointF &old_point, QUndoCommand *parent) :
+  QUndoCommand(parent),
+  key_(key),
+  mode_(mode),
+  old_point_(old_point),
+  new_point_(new_point)
+{
+}
+
+void KeyframeSetBezierControlPoint::redo()
+{
+  key_->set_bezier_control(mode_, new_point_);
+}
+
+void KeyframeSetBezierControlPoint::undo()
+{
+  key_->set_bezier_control(mode_, old_point_);
+}