#ifndef __PIPELINEEDITOR__QNODESEDITORCANVAS__H__
#define __PIPELINEEDITOR__QNODESEDITORCANVAS__H__

#include <QtGui/QGraphicsView>
#include <cpExtensions/DataStructures/Graph.h>
#include <cpPlugins/Interface/Workspace.h>

namespace PipelineEditor
{
  // Some other forward declarations
  class QNEBlock;
  class QNEConnection;
  class QNodesEditor;

  /**
   */
  class QNodesEditorCanvas
    : public QGraphicsView
  {
    Q_OBJECT;

  public:
    typedef cpPlugins::Interface::Workspace TWorkspace;
    typedef TWorkspace::TFilter             TFilter;
    typedef
      cpExtensions::DataStructures::
      Graph< QNEBlock*, QNEConnection*, std::string > TGraph;

  public:
    QNodesEditorCanvas( QWidget* parent = 0 );
    virtual ~QNodesEditorCanvas( );

    TWorkspace* workspace( );
    const TWorkspace* workspace( ) const;
    void setWorkspace( TWorkspace* ws );

  protected:
    /* TODO
       void keyPressEvent( QKeyEvent* event );
       void timerEvent( QTimerEvent* event );
    */
    void wheelEvent( QWheelEvent* event );

    void dragEnterEvent( QDragEnterEvent* event );
    void dragLeaveEvent( QDragLeaveEvent* event );
    void dragMoveEvent( QDragMoveEvent* event );
    void dropEvent( QDropEvent* event );

    void _scaleView( qreal scaleFactor );
    void _createBlock( TFilter* f );

  protected:
    TWorkspace* m_Workspace;
    QNodesEditor* m_Editor;
    TGraph::Pointer m_Graph;
  };

} // ecapseman

#endif // __PIPELINEEDITOR__QNODESEDITORCANVAS__H__

// eof - $RCSfile$