近期在学习OSGEarth，看example，自己结合Qt写了一些小例子，特此记录一下。
首先，考虑到OE（OSGEarth）嵌入到QGraphicsView中，首先收到按键、鼠标事件的就是QGraphicsView，因此，我们需要先把这一庞大的事件进行处理。 代码如下：eventadapter .h
class EventAdapter : public QGraphicsView{public:EventAdapter();~EventAdapter();protected:// 处理按键事件(QKeyEvent* event);virtual void keyReleaseEvent(QKeyEvent* event);mousePressEvent(QMouseEvent* event);virtual void mouseReleaseEvent(QMouseEvent* event);mouseDoubleClickEvent(QMouseEvent* event);virtual void mouseMoveEvent(QMouseEvent* event);wheelEvent(QWheelEvent* event);resizeEvent(QResizeEvent *event);moveEvent(QMoveEvent* event);timerEvent(QTimerEvent *event);private:void setKeyboardModifiers(QInputEvent* event);protected:osgViewer::GraphicsWindow* m_pGraphicsWindow;};
实现文件如下：eventadapter .cpp
void EventAdapter::keyPressEvent(QKeyEvent* event){QPoint pos = QCursor::pos();QList<QGraphicsItem*> listItems = items(mapToScene(pos.x(), pos.y()).toPoint());if (listItems.size() <= 0){setKeyboardModifiers(event);m_pGraphicsWindow->getEventQueue()->keyPress((osgGA::GUIEventAdapter::KeySymbol)*(event->text().toLatin1().data()));}QGraphicsView::keyPressEvent(event);}void EventAdapter::keyReleaseEvent(QKeyEvent* event){setKeyboardModifiers(event);m_pGraphicsWindow->getEventQueue()->keyRelease((osgGA::GUIEventAdapter::KeySymbol)*(event->text().toLatin1().data()));QGraphicsView::keyReleaseEvent(event);}void EventAdapter::mousePressEvent(QMouseEvent* event){QPoint pos = event->pos();QList<QGraphicsItem*> listItems = items(mapToScene(pos.x(), pos.y()).toPoint());if (listItems.size() > 0){QGraphicsView::mousePressEvent(event);}else{int button = 0;switch (event->button()){case Qt::LeftButton: button = 1; break;case Qt::MidButton: button = 2; break;case Qt::RightButton: button = 3; break;case Qt::NoButton: button = 0; break;default: button = 0; break;}setKeyboardModifiers(event);m_pGraphicsWindow->getEventQueue()->mouseButtonPress(event->x(), event->y(), button);}}void EventAdapter::mouseReleaseEvent(QMouseEvent* event){int button = 0;switch (event->button()){case Qt::LeftButton: button = 1; break;case Qt::MidButton: button = 2; break;case Qt::RightButton: button = 3; break;case Qt::NoButton: button = 0; break;default: button = 0; break;}setKeyboardModifiers(event);m_pGraphicsWindow->getEventQueue()->mouseButtonRelease(event->x(), event->y(), button);QGraphicsView::mouseReleaseEvent(event);}void EventAdapter::mouseDoubleClickEvent(QMouseEvent* event){QPoint pos = QCursor::pos();QList<QGraphicsItem*> listItems = items(mapToScene(pos.x(), pos.y()).toPoint());if (listItems.size() > 0){return;}int button = 0;switch (event->button()){case Qt::LeftButton: button = 1; break;case Qt::MidButton: button = 2; break;case Qt::RightButton: button = 3; break;case Qt::NoButton: button = 0; break;default: button = 0; break;}setKeyboardModifiers(event);m_pGraphicsWindow->getEventQueue()->mouseDoubleButtonPress(event->x(), event->y(), button);QGraphicsView::mouseDoubleClickEvent(event);}void EventAdapter::mouseMoveEvent(QMouseEvent* event){setKeyboardModifiers(event);m_pGraphicsWindow->getEventQueue()->mouseMotion(event->x(), event->y());QGraphicsView::mouseMoveEvent(event);}void EventAdapter::wheelEvent(QWheelEvent* event){setKeyboardModifiers(event);m_pGraphicsWindow->getEventQueue()->mouseScroll(event->orientation() == Qt::Vertical ?(event->delta() > 0 ? osgGA::GUIEventAdapter::SCROLL_UP : osgGA::GUIEventAdapter::SCROLL_DOWN) :(event->delta() > 0 ? osgGA::GUIEventAdapter::SCROLL_LEFT : osgGA::GUIEventAdapter::SCROLL_RIGHT));QGraphicsView::wheelEvent(event);}void EventAdapter::resizeEvent(QResizeEvent *event){if (scene()){scene()->setSceneRect(QRect(QPoint(0, 0), event->size()));}const QSize& size = event->size();m_pGraphicsWindow->resized(x(), y(), size.width(), size.height());m_pGraphicsWindow->getEventQueue()->windowResize(x(), y(), size.width(), size.height());m_pGraphicsWindow->requestRedraw();const QSize& oldSize = event->oldSize();int oldWidth = oldSize.width();int oldHeight = oldSize.height();int newWidth = size.width();int newHeight = size.height();double widthChangeRatio = double(newWidth) / double(oldWidth);double heigtChangeRatio = double(newHeight) / double(oldHeight);double aspectRatioChange = widthChangeRatio / heigtChangeRatio;QGraphicsView::resizeEvent(event);}void EventAdapter::moveEvent(QMoveEvent* event){const QPoint& pos = event->pos();m_pGraphicsWindow->resized(pos.x(), pos.y(), width(), height());m_pGraphicsWindow->getEventQueue()->windowResize(pos.x(), pos.y(), width(), height());QGraphicsView::moveEvent(event);}void EventAdapter::timerEvent(QTimerEvent *event){scene()->update();}
另，若需要触屏操作，则需要重新实现虚函数virtual bool viewportEvent(QEvent* event);
，而开始追寻他内心世界的真正财富
