C++ (Cpp) QGraphicsItem::contains示例

QWidget* QGraphicsViewAdapter::getWidgetAt(const QPoint& pos)
{
   QWidget* childAt = _graphicsView->childAt(pos);
   if(childAt) 
   {
       return childAt;
   }
  
   QGraphicsItem* item = _graphicsView->itemAt(pos);
   if(item && item->contains(item->mapFromScene(pos)))
   {
      QGraphicsProxyWidget* p = dynamic_cast<QGraphicsProxyWidget*>(item);
      if(p)
      {  
         childAt = p->widget();
         QWidget* c;
         while( (c = childAt->childAt(childAt->mapFromGlobal(pos)))!=0 )
         {
            childAt = c;
         }
         return childAt;
      }
   }
   return NULL;
}

示例#2

显示文件

void CalendarGraphicsItem::mouseReleaseEvent(QGraphicsSceneMouseEvent * event)
{
  QGraphicsItem * item;
  for(int i = 0; i < 42; ++i)
  {
    item = _items[QString("day%1").arg(i)];
    if(item && item->contains(item->mapFromScene(event->scenePos())))
    {
      QDate firstMonthDay = QDate(_selectedDay.year(), _selectedDay.month(), 1);
      QDate firstCalendarDay = firstMonthDay.addDays(firstMonthDay.dayOfWeek() * -1);
      if(firstMonthDay.dayOfWeek() < 2)
        firstCalendarDay = firstCalendarDay.addDays(-7);
      setSelectedDay(firstCalendarDay.addDays(i));
      return;
    }
  }
}