Ogitor探索之代码分析（1）---OgreWidget::mouseMoveEvent；OgitorsRoot::OnMouseMove

• 在../qtOgitor/src/ogrewidget.cpp中定义的void OgreWidget::mouseMoveEvent(QMouseEvent *evt)
• 代码如下：

 

   1: void OgreWidget::mouseMoveEvent(QMouseEvent *evt)

   2: {

   3:     if(!OgitorsRoot::getSingletonPtr()->IsSceneLoaded())

   4:         return;

   5:  

   6:     if(!hasFocus())

   7:         setFocus();

   8:  

   9:     Ogre::Vector2 pos(evt->x(), evt->y());

  10:  

  11:     OgitorsRoot::getSingletonPtr()->OnMouseMove(pos, getMouseButtons(evt->buttons(), evt->button()));

  12:  

  13:     OgreWidgetMouseMovedSincePress = true;

  14: }

 

•  
  • 在第11行调用的OgitorsRoot::getSingletonPtr()->OnMouseMove(pos, getMouseButtons(evt->buttons(), evt->button()));
  • 将坐标传递给OnMouseMove
• 在../Ogitor/src/OgitorsRootUtilityFunctions.cpp中定义的
• void OgitorsRoot::OnMouseMove (Ogre::Vector2 point, unsigned int buttons)
• point为鼠标在视口的坐标用（x,y）表示，坐标原点在左上角。

   1: void OgitorsRoot::OnMouseMove (Ogre::Vector2 point, unsigned int buttons)

   2: {

   3:     if(!mActiveViewport)

   4:         return;

   5:     Ogre::Vector4 rect;

   6:     mActiveViewport->getRect(rect);

   7:  

   8:     if((rect.x <= point.x) && (rect.y <= point.y) && ((rect.x + rect.z) >= point.x) && ((rect.y + rect.w) >= point.y))

   9:     {

  10:         if(mMouseListener)

  11:             mMouseListener->OnMouseMove(mActiveViewport, point - Ogre::Vector2(rect.x,rect.y), buttons);

  12:         else

  13:             mActiveViewport->OnMouseMove(point - Ogre::Vector2(rect.x,rect.y), buttons);

  14:     }

  15:     else

  16:     {

  17:         if(mMouseListener)

  18:             mMouseListener->OnMouseLeave(mActiveViewport, point - Ogre::Vector2(rect.x,rect.y), buttons);

  19:         else

  20:             mActiveViewport->OnMouseLeave(point - Ogre::Vector2(rect.x,rect.y), buttons);

  21:     }

  22: }

如图所示：

仅当加载有场景时才会调用OnMouseMove，并实时更新point 的值。OnMouseMove (Ogre::Vector2 point, unsigned int buttons)其中的 buttons 的值由getMouseButtons(evt->buttons(), evt->button())传递过来；判断鼠标按键对应值如下：

        OMB_LEFT = 1,       /** Left mouse button type */
        OMB_RIGHT = 2,      /** Right mouse button type */
        OMB_MIDDLE = 4      /** Middle mouse button type */

在../qtOgitor/src/ogrewidget.cpp中

 

   1: unsigned int OgreWidget::getMouseButtons(Qt::MouseButtons buttons, Qt::MouseButton button)

   2: {

   3:     unsigned int flags = 0;

   4:     buttons |= button;

   5:  

   6:     if(buttons.testFlag(Qt::LeftButton))

   7:         flags |= OMB_LEFT;

   8:     if(buttons.testFlag(Qt::RightButton))

   9:         flags |= OMB_RIGHT;

  10:     if(buttons.testFlag(Qt::MidButton))

  11:         flags |= OMB_MIDDLE;

  12:  

  13:     return flags;

  14: }

 

在../Ogitor/include/OgitorsDefinitions.h中

   1: /** Ogitor mouse button enumeration */

   2:     enum OgitorsMouseButtons

   3:     {

   4:         OMB_LEFT = 1,       /** Left mouse button type */

   5:         OMB_RIGHT = 2,      /** Right mouse button type */

   6:         OMB_MIDDLE = 4      /** Middle mouse button type */

   7:     };