QOgreWidget.cpp

#include "QOgreWidget.hpp"
#include <QResizeEvent>
#include <string>
#include <cassert>

#ifdef __unix__
    #include <QtX11Extras/QX11Info>
#endif


QOgreWidget::QOgreWidget(Ogre::Root* ogreRoot, IOgreEventHandler *ogreEventHandler, QWidget* parent) : 
  QGLWidget(parent), 
  mOgreEventHandler(ogreEventHandler),
  mOgreRoot(ogreRoot), 
  mOgreRenderWindow(NULL) {
      
    if (!parent) {
        throw std::runtime_error("Parent widget supplied was uninitialised!"); // interface requirement
    }

    setAttribute(Qt::WA_PaintOnScreen, true);
    setAttribute(Qt::WA_NoSystemBackground, true);
    setFocusPolicy(Qt::StrongFocus);

    Ogre::String winHandle;
    #ifdef WIN32
        // Windows code
        winHandle += Ogre::StringConverter::toString(this->parentWidget()->winId());
    #else
        winHandle = Ogre::StringConverter::toString((unsigned long)(QX11Info::display()));
        winHandle += ":";
        winHandle += Ogre::StringConverter::toString((unsigned int)(QX11Info::appScreen()));
        winHandle += ":";
        winHandle += Ogre::StringConverter::toString((unsigned long)(winId()));
    #endif

    Ogre::NameValuePairList params;
    params["parentWindowHandle"] = winHandle;
    params["FSAA"] = Ogre::String("8");

    int w = width();
    int h = height();
    mOgreRenderWindow = mOgreRoot->createRenderWindow("OgreWidget_RenderWindow", qMax(w, 640), qMax(h, 480), false, &params);
    mOgreRenderWindow->setActive(true);
    mOgreRenderWindow->setVisible(true);

    WId ogreWinId = 0x0;
    mOgreRenderWindow->getCustomAttribute("WINDOW", &ogreWinId);
    assert(ogreWinId); // guaranteed to be valid due to the way it was created
    QWidget::create(ogreWinId);
    setAttribute(Qt::WA_OpaquePaintEvent);   // qt won't bother updating the area under/behind the render window
}


Ogre::RenderWindow *QOgreWidget::getEmbeddedOgreWindow() {
    assert(mOgreRenderWindow); // guaranteed to be valid after construction
    return mOgreRenderWindow;
}


void QOgreWidget::paintEvent(QPaintEvent *pEvent) {
    this->update();
}


void QOgreWidget::resizeEvent(QResizeEvent *rEvent) {
    if (rEvent) {
        QWidget::resizeEvent(rEvent);
    }

    if (mOgreRenderWindow) {
        // since the underlying widget has already been updated we can source the resize values from there
        mOgreRenderWindow->reposition(x(), y());
        mOgreRenderWindow->resize(width(), height());
        mOgreRenderWindow->windowMovedOrResized();
    }
}


void QOgreWidget::mousePressEvent(QMouseEvent *event) {
    mOgreEventHandler->ogreMousePressEvent(event);
}


void QOgreWidget::mouseMoveEvent(QMouseEvent *event) {
    mOgreEventHandler->ogreMouseMoveEvent(event);
}


void QOgreWidget::update() {
    QWidget::update();
    mOgreRoot->renderOneFrame();
}