在GUIDE中的子功能之间传输数据

Question

我有一个带2个按钮的简单指南。按钮＃1绘制正弦图，按钮＃2为图形添加“可拖动”垂直线。 Idea基于以下链接1

我正在使用guidata在GUIDE中的子功能和回调之间传输数据。但其中一个共享变量（mousedown）不会在回调之间传输。导致子功能之间数据传输丢失的原因是什么？

以下是带有子功能的回调：

      % ######### Callbacl 1: Graph SIN function  
      function pushbutton_plot_Callback(hObject, eventdata, handles)   
      x = -pi:0.01:pi;
      y = sin(x);

      fig_h = figure('units','normalized','outerposition',[0.2 0.2 .5 .5],'WindowButtonMotionFcn', @MouseMove, 'WindowButtonUpFcn', @MouseUp );
      axis_h = axes('parent',fig_h,'position',[0.1 0.1 .8 .8]);
      line('parent',axis_h,'xdata',x,'ydata',y);

      handles.axis_h = axis_h;
      guidata(hObject,handles);

          %### MouseUp subfunctions in callback 1
          function MouseUp(h,event) %#ok<*INUSD>
              mousedown = false;
          end

          %### MouseUp subfunctions in callback 1
          function MouseMove(h,event)
              if isfield(handles,mousedown)
                  mousedown = handles.mousedown;
              else
                  mousedown = false;
              end

              if mousedown
                  cp = get ( axis_h, 'CurrentPoint' );
                  vertline_h = handles.vertline_h;
                  set ( vertline_h, 'XData', [cp(1,1) cp(1,1)] );
              end
          end
      end

      %######### Callbacl 2: Graph movables vertical line      
      function pushbutton_vertline_Callback(h, eventdata,handles)
      axis_h = handles.axis_h;
      vertline_h = line('parent',axis_h,'xdata',[1 1],'ydata',[-1 1], 'ButtonDownFcn', @mouseDown );

      handles.vertline_h = vertline_h;
      guidata(h,handles)

          %### MouseMove subfunction in callback 2
          function mouseDown(hObject,event)
              mousedown = true;
              handles.mousedown = mousedown;
              guidata(hObject,handles)
          end
      end