osgQt支持触摸屏

1. osgQt的构造函数添加：setAttribute(Qt::WA_AcceptTouchEvents);//wyh

2. event()修改，支持触摸时间

 

bool GLWidget::event( QEvent* event )

{



    // QEvent::Hide

    //

    // workaround "Qt-workaround" that does glFinish before hiding the widget

    // (the Qt workaround was seen at least in Qt 4.6.3 and 4.7.0)

    //

    // Qt makes the context current, performs glFinish, and releases the context.

    // This makes the problem in OSG multithreaded environment as the context

    // is active in another thread, thus it can not be made current for the purpose

    // of glFinish in this thread.



    // QEvent::ParentChange

    //

    // Reparenting GLWidget may create a new underlying window and a new GL context.

    // Qt will then call doneCurrent on the GL context about to be deleted. The thread

    // where old GL context was current has no longer current context to render to and

    // we cannot make new GL context current in this thread.



    // We workaround above problems by deferring execution of problematic event requests.

    // These events has to be enqueue and executed later in a main GUI thread (GUI operations

    // outside the main thread are not allowed) just before makeCurrent is called from the

    // right thread. The good place for doing that is right after swap in a swapBuffersImplementation.



    if (event->type() == QEvent::Hide)

    {

        // enqueue only the last of QEvent::Hide and QEvent::Show

        enqueueDeferredEvent(QEvent::Hide, QEvent::Show);

        return true;

    }

    else if (event->type() == QEvent::Show)

    {

        // enqueue only the last of QEvent::Show or QEvent::Hide

        enqueueDeferredEvent(QEvent::Show, QEvent::Hide);

        return true;

    }

    else if (event->type() == QEvent::ParentChange)

    {

        // enqueue only the last QEvent::ParentChange

        enqueueDeferredEvent(QEvent::ParentChange);

        return true;

    }

    //wyh

    else if(event->type() == QEvent::TouchBegin ||event->type() == QEvent::TouchUpdate || event->type() == QEvent::TouchEnd)

    {

        QList<QTouchEvent::TouchPoint> touchPoints = static_cast<QTouchEvent *>(event)->touchPoints();

        if(touchPoints.count() >= 2)

        {

            //test

            //std::cout << "touch multiViewer" << std::endl;    

            //std::cout << std::endl;



            osg::ref_ptr<osgGA::GUIEventAdapter> osg_event(NULL);

            foreach (const QTouchEvent::TouchPoint &touchPoint, touchPoints)

            {

                QPointF touchPos = touchPoint.pos();



                ////test

                //std::cout << "x:" << touchPos.x() << "\t" << "y:" << touchPos.y() << "\t";



                if(touchPoint.state() == Qt::TouchPointPressed)

                {

                    if (!osg_event) {

                        osg_event =  _gw->getEventQueue()->touchBegan( touchPoint.id(), osgGA::GUIEventAdapter::TOUCH_BEGAN, touchPos.x()  , touchPos.y());

                    } else {

                        osg_event->addTouchPoint( touchPoint.id(), osgGA::GUIEventAdapter::TOUCH_BEGAN, touchPos.x() , touchPos.y());

                    }

                }

                else if(touchPoint.state() == Qt::TouchPointMoved)

                {

                    if (!osg_event) {

                        osg_event =  _gw->getEventQueue()->touchMoved( touchPoint.id(), osgGA::GUIEventAdapter::TOUCH_MOVED, touchPos.x(), touchPos.y());

                    } else {

                        osg_event->addTouchPoint( touchPoint.id(), osgGA::GUIEventAdapter::TOUCH_MOVED, touchPos.x() , touchPos.y());

                    }

                }

                else if(touchPoint.state() == Qt::TouchPointReleased)

                {

                    // No double tap detection with RAW TOUCH Events, sorry.

                    if (!osg_event) {

                        osg_event =  _gw->getEventQueue()->touchEnded( touchPoint.id(), osgGA::GUIEventAdapter::TOUCH_ENDED, touchPos.x(), touchPos.y(), 1);

                    } else {

                        osg_event->addTouchPoint( touchPoint.id(), osgGA::GUIEventAdapter::TOUCH_ENDED, touchPos.x() , touchPos.y());

                    }

                }

            }

            return true;

        }



    }



    // perform regular event handling

    return QGLWidget::event( event );

}