QtGLGraphicsScene.cc

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//=============================================================================
//
//  CLASS QtGLGraphicsScene - IMPLEMENTATION
//
//=============================================================================

//== INCLUDES =================================================================

#include "QtGLGraphicsScene.hh"
#include <QGraphicsSceneMouseEvent>
#include <QApplication>
#include <QPainter>
#include <QPaintEngine>

//== NAMESPACES ===============================================================

namespace ACG {
namespace QtWidgets {


//== IMPLEMENTATION ===========================================================

QtGLGraphicsScene::QtGLGraphicsScene(QtBaseViewer* _w) :
  QGraphicsScene (),
  w_(_w)
{
}

 
void QtGLGraphicsScene::drawBackground(QPainter *_painter, const QRectF &_rect)
{
  // Check for switch in qt4.6 to OpenGL2
  if (_painter->paintEngine()->type() != QPaintEngine::OpenGL && _painter->paintEngine()->type() != QPaintEngine::OpenGL2 ) {
    std::cerr << "QtGLGraphicsScene: drawBackground needs a QGLWidget to be set as viewport on the graphics view\n";
    return;
  }
  
  // Initialize background first
  _painter->setBackground(QApplication::palette().window());
  _painter->eraseRect(_rect);
  
  // From now on we do OpenGL direct painting on the scene
  // Tell Qt that we directly use OpenGL
  _painter->beginNativePainting();

  // Clear the depth buffer (This is required since QT4.6 Otherwise we get an emtpty scene!
  glClear(GL_DEPTH_BUFFER_BIT);
  
  w_->paintGL();

  // The rest is painting through QT again. 
  _painter->endNativePainting();
}


void QtGLGraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent* _e)
{
  QGraphicsScene::mousePressEvent(_e);
  if (_e->isAccepted())
    return;

  QPoint p (_e->scenePos().x(), _e->scenePos().y());
  QMouseEvent me(QEvent::MouseButtonPress ,p, _e->screenPos(), _e->button(),
                 _e->buttons(), _e->modifiers());
  w_->glMousePressEvent(&me);
  _e->accept();
}

void QtGLGraphicsScene::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* _e)
{
  QGraphicsScene::mouseDoubleClickEvent(_e);
  if (_e->isAccepted())
    return;

  QPoint p (_e->scenePos().x(), _e->scenePos().y());
  QMouseEvent me(QEvent::MouseButtonDblClick ,p, _e->screenPos(), _e->button(),
                 _e->buttons(), _e->modifiers());
  w_->glMouseDoubleClickEvent(&me);
  _e->accept();
}

void QtGLGraphicsScene::mouseReleaseEvent(QGraphicsSceneMouseEvent* _e)
{
  QGraphicsScene::mouseReleaseEvent(_e);
  if (_e->isAccepted())
    return;

  QPoint p (_e->scenePos().x(), _e->scenePos().y());
  QMouseEvent me(QEvent::MouseButtonRelease ,p, _e->screenPos(), _e->button(),
                 _e->buttons(), _e->modifiers());
  w_->glMouseReleaseEvent(&me);
  _e->accept();
}

void QtGLGraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent* _e)
{
  QGraphicsScene::mouseMoveEvent(_e);
  if (_e->isAccepted())
    return;

  QPoint p (_e->scenePos().x(), _e->scenePos().y());
  QMouseEvent me(QEvent::MouseMove ,p, _e->screenPos(), _e->button(),
                 _e->buttons(), _e->modifiers());
  w_->glMouseMoveEvent(&me);
  _e->accept();
}

void QtGLGraphicsScene::wheelEvent(QGraphicsSceneWheelEvent* _e)
{
  QGraphicsScene::wheelEvent(_e);
  if (_e->isAccepted())
    return;
  QPoint p (_e->scenePos().x(), _e->scenePos().y());
  QWheelEvent we(p, _e->screenPos(), _e->delta(), _e->buttons(),
         _e->modifiers(), _e->orientation());
  w_->glMouseWheelEvent(&we);
  _e->accept();
}

void QtGLGraphicsScene::keyPressEvent(QKeyEvent* _e)
{
  QGraphicsScene::keyPressEvent(_e);
  if (_e->isAccepted())
    return;
  w_->glKeyPressEvent (_e);
}

void QtGLGraphicsScene::keyReleaseEvent(QKeyEvent* _e)
{
  QGraphicsScene::keyReleaseEvent(_e);
  if (_e->isAccepted())
    return;
  w_->glKeyReleaseEvent (_e);
}

void QtGLGraphicsScene::contextMenuEvent(QGraphicsSceneContextMenuEvent* _e)
{
  QGraphicsScene::contextMenuEvent(_e);
  if (_e->isAccepted())
    return;

  QPoint p (_e->scenePos().x(), _e->scenePos().y());
  QContextMenuEvent ce(static_cast<QContextMenuEvent::Reason> (_e->reason()),
                       p, _e->screenPos(), _e->modifiers());
  w_->glContextMenuEvent(&ce);
  _e->accept();
}

void QtGLGraphicsScene::dragEnterEvent(QGraphicsSceneDragDropEvent* _e)
{
  QGraphicsScene::dragEnterEvent(_e);
  if (_e->isAccepted())
    return;

  QPoint p (_e->scenePos().x(), _e->scenePos().y());
  QDragEnterEvent de(p, _e->possibleActions(), _e->mimeData(), _e->buttons(),
                     _e->modifiers ());
  w_->glDragEnterEvent(&de);
  _e->accept();
}

void QtGLGraphicsScene::dropEvent(QGraphicsSceneDragDropEvent* _e)
{
  QGraphicsScene::dropEvent(_e);
  if (_e->isAccepted())
    return;
  QPoint p (_e->scenePos().x(), _e->scenePos().y());
  QDropEvent de(p, _e->possibleActions(), _e->mimeData(), _e->buttons(),
                _e->modifiers ());
  w_->glDropEvent(&de);
  _e->accept();
}

//=============================================================================
} // namespace QtWidgets
} // namespace ACG
//=============================================================================