Qt鼠标移动事件未被事件过滤器捕获 [英] Qt mouse move events not caught by an event filter

问题描述

这是我的事件过滤器：

  bool 
 MapWidget_c :: eventFilter（QObject * obj，QEvent * ev）
 {
 if（obj == graphicsGeoMap_mp || 
 obj == graphicsScene_mp || 
 obj == graphicsView_mp）
 {
 if（ev-> type（）== QEvent :: MouseMove）
 {
 QMouseEvent * mouseEvent = static_cast< QMouseEvent *>（ev）; 
 
 mouseMoveEvent（mouseEvent）; 
 
返回true; 
} 
 else 
 {
 return false; 
} 
} 
 else 
 {
 //将事件传递给父类
返回QWidget :: eventFilter（obj，ev）; 
} 
} 
  

我安装了这样的过滤器：

  graphicsGeoMap_mp-> installEventFilter（this）; // QGraphicsGeoMap 
 graphicsScene_mp-> installEventFilter（this）; // QGraphicsScene 
 graphicsView_mp-> installEventFilter（this）; // QGraphicsScene 
  

事件过滤器似乎捕获mousePress和mouseRelease事件，但不是mouseMove。 / p>

可能是什么问题？

解决方案

事实证明，正在寻找错误的mouseMove事件。

我应该捕捉到 QEvent :: GraphicsSceneMouseMove 事件而不是 QEvent :: MouseMove 事件。

I can't seem to catch QEvent::MouseMove typed events in my eventFilter.

Here's my event filter:

bool
MapWidget_c::eventFilter( QObject *obj, QEvent *ev )
{
   if( obj == graphicsGeoMap_mp ||
       obj == graphicsScene_mp ||
       obj == graphicsView_mp )
   {
      if( ev->type() == QEvent::MouseMove )
      {
         QMouseEvent *mouseEvent = static_cast< QMouseEvent* >( ev );

         mouseMoveEvent( mouseEvent );

         return true;
      }
      else
      {
         return false;
      }
   }
   else
   {
      // pass the event on to the parent class
      return QWidget::eventFilter( obj, ev );
   }
}

I install the filters like this:

graphicsGeoMap_mp->installEventFilter( this ); //QGraphicsGeoMap
graphicsScene_mp->installEventFilter( this ); //QGraphicsScene
graphicsView_mp->installEventFilter( this ); //QGraphicsScene

The event filter seems to catch mousePress and mouseRelease events just fine, but not mouseMove.

What could be the problem?

解决方案

It turns out that I was looking for wrong kind of mouseMove events.

I should've been catching QEvent::GraphicsSceneMouseMove events instead of QEvent::MouseMove events.

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