FrmViewerOpenGL.h

// Author: Kang Lin <kl222@126.com>
 
#ifndef CFRMVIEWEROPENGL_H
#define CFRMVIEWEROPENGL_H
 
#include <QImage>
#include <QOpenGLFunctions>
#include <QOpenGLBuffer>
#include <QOpenGLShaderProgram>
#include <QOpenGLWidget>
#include <QOpenGLTexture>
#include <QOpenGLVertexArrayObject>
#include <QSettings>
#include "client_export.h"
 
class CLIENT_EXPORT CFrmViewerOpenGL
        : public QOpenGLWidget, protected QOpenGLFunctions
{
    Q_OBJECT
    Q_PROPERTY(double ZoomFactor READ GetZoomFactor WRITE SetZoomFactor)
 
public:
    explicit CFrmViewerOpenGL(QWidget *parent = nullptr);
    virtual ~CFrmViewerOpenGL() override;
    
    enum ADAPT_WINDOWS {
        Disable = 0,                  
        Auto = 1,
        Original = 2,                 
        OriginalCenter = 3,           
        Zoom = 4,                     
        ZoomToWindow = 5,             
        KeepAspectRationToWindow = 6, 
    };
    void SetAdaptWindows(ADAPT_WINDOWS aw = Original);
    ADAPT_WINDOWS GetAdaptWindows();
    
    double GetZoomFactor() const;
    int SetZoomFactor(double newZoomFactor);
    QSize GetDesktopSize();
 
    virtual int Load(QSettings &set);
    virtual int Save(QSettings &set);
 
    virtual QImage GrabImage(int x = 0, int y = 0, int w = -1, int h = -1);
    
public Q_SLOTS:
    void slotSetDesktopSize(int width, int height);
    void slotSetName(const QString& szName);
    void slotUpdateRect(const QRect& r, const QImage& image);
    void slotUpdateRect(QSharedPointer<CImage> image);
    void slotUpdateCursor(const QCursor& cursor);
    void slotUpdateCursorPosition(const QPoint& pos);
    void slotSystemCombination();
    
Q_SIGNALS:
    void sigMousePressEvent(Qt::MouseButtons, QPoint);
    void sigMouseReleaseEvent(Qt::MouseButton, QPoint);
    void sigMouseMoveEvent(Qt::MouseButtons buttons, QPoint pos);
    void sigMouseMoveEvent(QMouseEvent *event);
    void sigWheelEvent(Qt::MouseButtons buttons, QPoint pos, QPoint angleDelta);
    void sigKeyPressEvent(int key, Qt::KeyboardModifiers modify);
    void sigKeyReleaseEvent(int key, Qt::KeyboardModifiers modify);
 
    // QOpenGLWidget interface
protected:
    virtual void initializeGL() override;
    virtual void resizeGL(int w, int height) override;
    virtual void paintGL() override;
 
    virtual void mousePressEvent(QMouseEvent *event) override;
    virtual void mouseReleaseEvent(QMouseEvent *event) override;
    virtual void mouseMoveEvent(QMouseEvent *event) override;
    virtual void wheelEvent(QWheelEvent *event) override;
    virtual void keyPressEvent(QKeyEvent *event) override;
    virtual void keyReleaseEvent(QKeyEvent *event) override;
 
    void InitVertor();
 
private:
    QImage m_Desktop;
 
    QOpenGLVertexArrayObject m_VaoQuad;
    QOpenGLBuffer m_VboQuad;
    QOpenGLShaderProgram m_ShaderProgram;
    QVector<GLfloat> m_VertexData;
 
    QOpenGLTexture* m_pTexture;
 
    ADAPT_WINDOWS m_AdaptWindows;
    double m_dbZoomFactor;
 
    int ReSize(int width, int height);
    int TranslationMousePoint(QPointF inPos, QPointF &outPos);
    QRectF GetAspectRationRect();
};
 
#endif // CFRMVIEWEROPENGL_H