鼠标中轮滚动事件问题

rubby

各位大哥，求救

我获取鼠标中轮滚动事件成功，但是输出  ea.getScrollingDeltaY();
ea.getScrollingDeltaX();
日志文件中显示的值都是0。
代码如下， osg 版本3.0.1，MFC+osg，操作系统 win7

1.        
   
2. case osgGA::GUIEventAdapter::SCROLL: //TODO 鼠标中轮滚动 获取Detal值失败
   
3. if ( ea.getScrollingMotion() == osgGA::GUIEventAdapter::ScrollingMotion::SCROLL_UP ) //offset  负值
   
4. {
   
5.         float fScrollDeltaY = ea.getScrollingDeltaY();
   
6.         float fScrollDeltaX = ea.getScrollingDeltaX();
   
7.                        
   
8.         ofile<<"scrolling up,-offset: Y "<<fScrollDeltaY<<" X "<<fScrollDeltaX<<std::endl;
   
9.         ofile.flush();
   
10.         return true;
    
11. 
    
12. }else if( ea.getScrollingMotion() == osgGA::GUIEventAdapter::ScrollingMotion::SCROLL_DOWN ){ //offset 正值
    
13.         float fScrollDeltaY = ea.getScrollingDeltaY();                               
    
14.         float fScrollDeltaX = ea.getScrollingDeltaX();
    
15.                        
    
16.         ofile<<"scrolling down,+offset: Y "<<fScrollDeltaY<<" X "<<fScrollDeltaX<<std::endl;
    
17.         ofile.flush();
    
18.         return true;
    
19. }}

复制代码

rubby

哪位大哥指点迷津啊，小弟跪谢。。。

rubby

log日志信息：

scrolling down,+offset: Y 0 X 0
scrolling down,+offset: Y 0 X 0
scrolling down,+offset: Y 0 X 0
scrolling down,+offset: Y 0 X 0
scrolling down,+offset: Y 0 X 0
scrolling down,+offset: Y 0 X 0
scrolling down,+offset: Y 0 X 0
scrolling down,+offset: Y 0 X 0
scrolling down,+offset: Y 0 X 0
scrolling down,+offset: Y 0 X 0
scrolling up,-offset: Y 0 X 0
scrolling up,-offset: Y 0 X 0
scrolling up,-offset: Y 0 X 0
scrolling up,-offset: Y 0 X 0
scrolling up,-offset: Y 0 X 0
scrolling up,-offset: Y 0 X 0
scrolling up,-offset: Y 0 X 0
scrolling up,-offset: Y 0 X 0
scrolling up,-offset: Y 0 X 0

各位大哥，是不是由于默认的TrackballManipulator 接收了 鼠标中键滚动事件，导致的这个值总是获取为0？
多谢