#ifndef _H_LPIMGVIEWER_H_
#define _H_LPIMGVIEWER_H_

#include <QGraphicsView>
#include <QGraphicsItem>
#include <QGraphicsScene>
#include <QLabel>

typedef QImage (*ImageScaleFun)(QImage, double, int);

class lpImgViewer : public QGraphicsView
{
	Q_OBJECT
public:
    static QString pixelInfoStr(QPoint pos, QRgb rgb);

public:
	lpImgViewer(QGraphicsScene *scene, QWidget *parent = 0);
	lpImgViewer(QWidget* parent = 0);
	virtual ~lpImgViewer(){
		if (mpImg)
			delete mpImg;
	}

	virtual QGraphicsPixmapItem* setImg(QImage& img);
	void setInfoLabel(QLabel* ipLabel){ mpInfoLabel = ipLabel; }
	void setResetCenter();
    const QImage* img() { return mpImg; }
    QGraphicsPixmapItem* imgItem() { return mpImgItem; }

	virtual void wheelEvent(QWheelEvent *evt);
	virtual void mouseMoveEvent(QMouseEvent *evt);
    virtual void resizeEvent(QResizeEvent* evt);
	virtual void mouseReleaseEvent(QMouseEvent *evt);
    virtual void closeEvent(QCloseEvent *evt);
	virtual void clear();

	virtual const qreal getScale(void) const { return m_scale; };
	virtual void setChannel(const QString& channel) { m_channel = channel; }
	virtual QString getChannel() const { return m_channel; }
    bool isFixedSizeScale() const { return mIsFixedSizeScale; }
    void setIsFixedSizeScale(bool val) { mIsFixedSizeScale = val; }
    qreal fixedSizeScale() const { return mFixedSizeScale; }
    void setFixedSizeScale(qreal val) { mFixedSizeScale = val; }
    ImageScaleFun imgScaleFunc() const { return mImgScaleFunc; }
    void setImgScaleFunc(ImageScaleFun val) { mImgScaleFunc = val; }
    void setInitScale(qreal val);

    bool isAutoResetTransform() const { return mIsAutoResetTransform; }
    void setIsAutoResetTransform(bool val) { mIsAutoResetTransform = val; }
	bool isAutoResetToWindowSize() const { return mIsAutoResetToWindowSize; }
	void setIsAutoResetToWindowSize(bool val) { mIsAutoResetToWindowSize = val; }

signals:
	void imgScaled(QTransform tf, QPointF center);
	void imgMoved(QPointF pos);
	void pixelSelected(QPoint pos);
    void imgScaledWithFixedSize(qreal scale);
	void sgImageScale(qreal);
public slots:
	void scaleImg(QTransform tf, QPointF center);
	void moveImg(QPointF pos);
    void selectPixel(QPoint pos);
    void scaleImageWithFixedViewSize();

protected:
	QGraphicsPixmapItem* mpImgItem{ nullptr };
	QSize mImgOriSize;
    qreal mMinScaleThre;
	QLabel* mpInfoLabel{ nullptr };
	QImage* mpImg{ nullptr };

	void scaleImg2(qreal scale);
	qreal m_scale;
	QString m_channel;

    bool mIsFixedSizeScale;
    qreal mFixedSizeScale;
    bool mIsAutoResetTransform;
	bool mIsAutoResetToWindowSize;

    ImageScaleFun mImgScaleFunc;
};

#endif