code_app/app/scanner2/HGImgView.h

#ifndef __HGIMGVIEW_H__
#define __HGIMGVIEW_H__

#include "base/HGDef.h"
#include "base/HGBaseErr.h"
#include "base/HGImage.h"
#include <QWidget>

class HGImgView : public QWidget
{
    Q_OBJECT
public:
    HGImgView(QWidget* parent = nullptr);
    virtual ~HGImgView();

    HGResult setScrollSize(int size);
    HGResult setMinScrollSliderSize(int size);
    HGResult setHScrollLeftImage(const QImage *normalImage, const QImage *hotImage, const QImage *pushImage);
    HGResult setHScrollRightImage(const QImage *normalImage, const QImage *hotImage, const QImage *pushImage);
    HGResult setVScrollTopImage(const QImage *normalImage, const QImage *hotImage, const QImage *pushImage);
    HGResult setVScrollBottomImage(const QImage *normalImage, const QImage *hotImage, const QImage *pushImage);
    HGResult setHScrollImage(const QImage *image, const HGRect *stretch);
    HGResult setHScrollSliderImage(const QImage *normalImage, const HGRect *normalStretch, const QImage *hotImage, const HGRect *hotStretch,
        const QImage *pushImage, const HGRect *pushStretch);
    HGResult setVScrollImage(const QImage *image, const HGRect *stretch);
    HGResult setVScrollSliderImage(const QImage *normalImage, const HGRect *normalStretch, const QImage *hotImage, const HGRect *hotStretch,
        const QImage *pushImage, const HGRect *pushStretch);
    HGResult setNullScrollImage(const QImage *image);

    HGResult enableScroll(bool enable);
    HGResult addImage(HGImage image);
    HGResult clearImage();
    HGResult getImage(HGImage *image);
    HGResult enableHighQuality(bool enable);

    HGResult rotateLeft();
    HGResult rotateRight();
    HGResult rotate180();

    HGResult zoomIn(const HGPoint *pCenter);
    HGResult zoomOut(const HGPoint *pCenter);
    HGResult realSize();
    HGResult fitWndSize();
    HGResult fitWndWidth();

    HGResult showColorInfo(bool show);

signals:
    void escape();
    void doubleClicked();
    void mousePos(int x, int y);
    void scaleChanged(double scale);
    void drop(const QObject *source, const QStringList &fileNames);

private:

    enum MouseStatus
    {
        MouseStatus_Null = 0,
        MouseStatus_HScroll,
        MouseStatus_HScrollSlider,
        MouseStatus_HScrollLeft,
        MouseStatus_HScrollRight,
        MouseStatus_VScroll,
        MouseStatus_VScrollSlider,
        MouseStatus_VScrollTop,
        MouseStatus_VScrollBottom,
        MouseStatus_NullScroll
    };

protected:
    virtual void mousePressEvent(QMouseEvent *e);
    virtual void mouseMoveEvent(QMouseEvent* e);
    virtual void mouseReleaseEvent(QMouseEvent *e);
    virtual void enterEvent(QEvent *e);
    virtual void leaveEvent(QEvent *e);
    virtual void paintEvent(QPaintEvent* e);
    virtual void wheelEvent(QWheelEvent* e);
    virtual void resizeEvent(QResizeEvent* e);
    virtual void keyPressEvent(QKeyEvent *e);
    virtual void dragEnterEvent(QDragEnterEvent *e);
    virtual void dragMoveEvent(QDragMoveEvent *e);
    virtual void dragLeaveEvent(QDragLeaveEvent *e);
    virtual void dropEvent(QDropEvent *e);
    virtual void mouseDoubleClickEvent(QMouseEvent* e);

private:
    static void GetMinShowImageRect(const HGRect *pWnd, int nImgWidth, int nImgHeight, bool &bShowImage, HGRectF &rcShowImage);
    static void ResizeShowImageRect(bool &bShowImage, HGRectF &rcShowImage, float fNewWidth, float fNewHeight, const HGPoint *pCenter);
    static void recalcShowRect(int wndWidth, int wndHeight, int scrollSize, bool hScroll, bool vScroll, bool showImage, HGRectF &imageRect);
    static void DrawImage(QPainter &painter, const QRect &destRect, const QImage *image, const QRect &stretchRect);

    QImage* createQImage();
    void DrawScroll(QPainter &painter);
    void reset();
    void updateMoveStatusAndCursor();
    MouseStatus getMouseStatus(const QPoint &pt);

    QRect getHScrollLeftPos();
    QRect getHScrollRightPos();
    QRect getHScrollPos();
    QRect getHScrollSliderPos();
    QRect getVScrollTopPos();
    QRect getVScrollBottomPos();
    QRect getVScrollPos();
    QRect getVScrollSliderPos();
    QRect getNullScrollPos();

    void Show();

private:
    int m_scrollSize;
    int m_minScrollSliderSize;
    QImage *m_hScrollLeftImage[3];
    QImage *m_hScrollRightImage[3];
    QImage *m_vScrollTopImage[3];
    QImage *m_vScrollBottomImage[3];
    QImage *m_hScrollImage;
    QRect m_hScrollImageStretch;
    QImage *m_hScrollSliderImage[3];
    QRect m_hScrollSliderImageStretch[3];
    QImage *m_vScrollImage;
    QRect m_vScrollImageStretch;
    QImage *m_vScrollSliderImage[3];
    QRect m_vScrollSliderImageStretch[3];
    QImage *m_nullScrollImage;

    bool m_enableScroll;
    bool m_mouseOn;
    bool m_hScroll;
    bool m_vScroll;
    HGImage m_image;
    QImage *m_qImage;
    bool m_showImage;
    HGRectF m_showRect;
    bool m_enableHighQuality;
    MouseStatus m_mouseMoveStatus;
    MouseStatus m_mousePressStatus;
    int m_mousePressBeginX;
    int m_mousePressBeginY;
    bool m_showColorInfo;
    int m_operate;
    int m_beginX;
    int m_beginY;
    bool m_draging;
};

#endif /* __HGIMGVIEW_HPP__ */