NodeHandler.h

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/*  Copyright (C) 2011 Jonathan Wuest

    This file is part of Tuchulcha.

    Tuchulcha is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Tuchulcha is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with Tuchulcha.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef NODEHANDLER_H_
#define NODEHANDLER_H_

#include <QGraphicsScene>
#include <QMap>

class NodeProperty;
class ConnectionLine;
class Node;
class GraphModel;

class NodeHandler: public QGraphicsScene {
    Q_OBJECT

public:

    NodeHandler(GraphModel* model, QObject* parent = 0);

    virtual ~NodeHandler() ;


    void connectNodes(QString node0,QString prop0,QString node1,QString prop1);

    GraphModel* model();


    bool load(QString fname);

public slots:
    void loadFromModel();


    void saveFlowchart();

    void selectNode(QString name);

    void updateTooltip(QString comment);

protected:
    // \{
    virtual void dragEnterEvent(QGraphicsSceneDragDropEvent* event);
    virtual void dragMoveEvent(QGraphicsSceneDragDropEvent * event);
    virtual void dropEvent(QGraphicsSceneDragDropEvent* event);
    // \}

    virtual void mousePressEvent(QGraphicsSceneMouseEvent* event);


    virtual void keyPressEvent(QKeyEvent* keyEvent);

    virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent* event);

    virtual void mouseMoveEvent(QGraphicsSceneMouseEvent* event);


    virtual void contextMenuEvent(QGraphicsSceneContextMenuEvent* event);

private:
    void _deselectAllNodes();

    void setNodeActive();

    ConnectionLine* _cline;

    NodeProperty* _startProp;

    Node* _selectedNode;

    GraphModel* _model;

    bool _addLine;

    QMap<QString,Node*> _nodeMap;

signals:
    void statusMessage(QString msg) const;

    void nodeTypeSelected(QString type) const;
};

#endif /* NODEHANDLER_H_ */