dragAndDrop.cc

/*===========================================================================*\
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*                              OpenFlipper                                   *
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 *           Department of Computer Graphics and Multimedia                  *
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\*===========================================================================*/
 
 
 
 
 
//=============================================================================
//
//  CLASS CoreWidget - IMPLEMENTATION
//
//=============================================================================
 
 
//== INCLUDES =================================================================
 
// -------------------- mview
#include "CoreWidget.hh"
 
 
 
//== IMPLEMENTATION ==========================================================
 
// Drag evencts view Magic ( header for drag and drop of views )
static const char VIEW_MAGIC[] = "ACG::QtWidgets::QGLViewerWidget encoded view";
 
//=============================================================================
 
void CoreWidget::startDrag ( QMouseEvent* _event )
{
  QObject* senderPointer = sender();
  int examinerId = -1;
 
  if ( senderPointer != 0 ) {
    for ( unsigned int i = 0 ; i < OpenFlipper::Options::examinerWidgets(); ++i ) {
      if ( senderPointer == examiner_widgets_[i] ) {
        examinerId = i;
        break;
      }
    }
 
  }
 
  if ( examinerId == -1 ) {
    emit log(LOGERR , tr("startDrag in Core called by non examiner, stopping here"));
    return;
  }
 
  PluginFunctions::setActiveExaminer(examinerId);
 
  // Get the correct position in the widget
  QPoint position = _event->pos();
 
  // -1 if no object id found for the current picking position
  // otherwise the id of the object
  int objectId = -1;
 
  // Do picking in the gl area to find an object
  size_t          node_idx, target_idx;
  ACG::Vec3d      hit_point;
  BaseObjectData* object;
  if ( PluginFunctions::scenegraphPick ( ACG::SceneGraph::PICK_ANYTHING,
                                          position,
                                          node_idx,
                                          target_idx,
                                          &hit_point ) ) {
    if ( PluginFunctions::getPickedObject ( node_idx, object ) )
        objectId = object->id();
  }
 
  if ( objectId != -1 ) {
    emit log(LOGERR , tr("dragEvent Picked Object"));
  }
 
 
 
 
  QString view;
  examiner_widgets_[PluginFunctions::activeExaminer()]->encodeView ( view );
 
  QDrag     * drag = new QDrag ( this );
  QMimeData * mime_data = new QMimeData;
 
  mime_data->setText ( view );
  drag->setMimeData ( mime_data );
  drag->exec();
 
}
 
void CoreWidget::dragEnterEvent ( QDragEnterEvent* _event ) {
 
  if ( _event->mimeData()->hasFormat ( "text/plain" ) ) {
      QString view ( _event->mimeData()->text() );
 
      // view information entering via drag
      if ( view.left ( sizeof ( VIEW_MAGIC ) - 1 ) == QString ( VIEW_MAGIC ) ) {
        _event->acceptProposedAction();
      }
 
  }
 
}
 
void CoreWidget::dropEvent ( QDropEvent* _event ) {
  QObject* senderPointer = sender();
  int examinerId = -1;
 
  if ( senderPointer != 0 ) {
    for ( unsigned int i = 0 ; i < OpenFlipper::Options::examinerWidgets(); ++i ) {
      if ( senderPointer == examiner_widgets_[i] ) {
        examinerId = i;
        break;
      }
    }
  }
 
  if ( examinerId == -1 ) {
    emit log(LOGERR , tr("startDrag in Core called by non examiner, stopping here"));
    return;
  }
 
  PluginFunctions::setActiveExaminer(examinerId);
 
  if ( _event->mimeData()->hasUrls() ) {
    QList<QUrl> urls = _event->mimeData()->urls();
    for ( int j = 0 ; j < urls.size() ; ++j ) {
      emit log(LOGWARN , tr("Dropped URL: %1").arg(urls[j].toLocalFile()));
      emit dragOpenFile(urls[j].toLocalFile());
    }
 
    return;
  }
 
  if ( _event->mimeData()->hasFormat ( "text/plain" ) ) {
 
    QString view ( _event->mimeData()->text() );
 
    // Dropped view information
    if ( view.left ( sizeof ( VIEW_MAGIC ) - 1 ) == QString ( VIEW_MAGIC ) ) {
      examiner_widgets_[PluginFunctions::activeExaminer()]->decodeView ( view );
      _event->acceptProposedAction();
      return;
    }
    
    // Dropped file information
    if ( view.left ( 7 ) == QString("file://") ) {
      _event->acceptProposedAction();
      emit dragOpenFile(view.remove(0,7));
      
      return;
    } 
 
    emit log(LOGERR , tr("Unknown drop event! Unable to handle the dropped data! Received data: %1").arg(view));
  }
 
  emit log(LOGERR , tr("Unknown drop event!"));
 
 
}
 
//=============================================================================