/* This file is part of the KDE project
 * Copyright (c) 2009 Jan Hambrecht <jaham@gmx.net>
 *
 * This library 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 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#ifndef FILTEREFFECTSCENEITEMS_H
#define FILTEREFFECTSCENEITEMS_H

#include <QGraphicsRectItem>
#include <QGraphicsSceneMouseEvent>
#include <QDrag>
#include <QMimeData>

class KoFilterEffect;

/// Graphics item representing a connector (input/output)
class ConnectorItem : public QGraphicsEllipseItem
{
public:
    enum ConnectorType { Input, Output };

    ConnectorItem(ConnectorType type, int index, QGraphicsItem * parent);
    void setCenter(const QPointF &position);
    ConnectorType connectorType();
    int connectorIndex() const;
    KoFilterEffect * effect() const;
private:
    ConnectorType m_type;
    int m_index;
};

/// Custom mime data for connector drag and drop
class ConnectorMimeData : public QMimeData
{
public:
    explicit ConnectorMimeData(ConnectorItem *connector);
    ConnectorItem * connector() const;
private:
    ConnectorItem * m_connector;
};

/// Base class for effect items
class EffectItemBase : public QGraphicsRectItem
{
public:
    explicit EffectItemBase(KoFilterEffect *effect);

    /// Returns the position of the output connector
    QPointF outputPosition() const;

    /// Returns the position of the specified input connector
    QPointF inputPosition(int index) const;

    /// Returns the name of the output
    QString outputName() const;

    /// Returns the size of the connectors
    QSizeF connectorSize() const;

    /// Returns the corresponding filter effect
    KoFilterEffect * effect() const;

protected:
    void createText(const QString &text);
    void createOutput(const QPointF &position, const QString &name);
    void createInput(const QPointF &position);

    virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
    virtual void dragMoveEvent(QGraphicsSceneDragDropEvent * event);
    virtual void dropEvent(QGraphicsSceneDragDropEvent * event);

    ConnectorItem * connectorAtPosition(const QPointF &scenePosition);

private:
    QPointF m_outputPosition;
    QString m_outputName;
    QList<QPointF> m_inputPositions;
    KoFilterEffect * m_effect;
};

/// Graphics item representing a predefined input image
class DefaultInputItem : public EffectItemBase
{
public:
    DefaultInputItem(const QString &name, KoFilterEffect *effect);
private:
    QString m_name;
};

/// Graphics item representing a effect primitive
class EffectItem : public EffectItemBase
{
public:
    explicit EffectItem(KoFilterEffect *effect);

private:
    KoFilterEffect * m_effect;
};

/// Graphics item representing an connection between an output and input
class ConnectionItem : public QGraphicsPathItem
{
public:
    ConnectionItem(EffectItemBase *source, EffectItemBase * target, int targetInput);

    /// Returns the source item of the connection
    EffectItemBase * sourceItem() const;
    /// Returns the target item of the connection
    EffectItemBase * targetItem() const;
    /// Returns the input index of the target item
    int targetInput() const;

    /// Sets the source item
    void setSourceItem(EffectItemBase * source);
    /// Set the target item and the corresponding input index
    void setTargetItem(EffectItemBase * target, int targetInput);

private:
    EffectItemBase * m_source;
    EffectItemBase * m_target;
    int m_targetInput;
};

#endif // FILTEREFFECTSCENEITEMS_H
