videoplayer.h

#ifndef VIDEOPLAYER_H
#define VIDEOPLAYER_H
 
#include <QWidget>
#include <QShortcut>
#include <QKeySequence>
#include <QGraphicsTextItem>
#include <QGraphicsOpacityEffect>
 
#include "opencv2/core.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/imgcodecs.hpp"
#include "ui_videoplayer.h"
#include "cvmat_qmetadata.h"
#include "visualization.h"
 
#define OVERLAY_PADDING 13
#define OVERLAY_MIN_WIDTH 50
 
namespace Ui {
class VideoPlayer;
}
 
class VideoPlayer : public QWidget
{
    Q_OBJECT
 
public:
 
    explicit VideoPlayer(QWidget *parent = nullptr, ColorTheme theme = DARK);
 
    ~VideoPlayer();
 
    void showVisualization(const VIS::Visualization &vis);
 
    void clearVisualization();
 
    void showImage(const cv::Mat &image);
 
    void setKeyframe(bool isKeyframe);
 
    void setKeyframeCount(unsigned int keyframeCount);
 
    void setEnabledBackBtns(bool enabled);
 
    void setEnabledForwardBtns(bool enabled);
 
    void setPlaying(bool playing);
 
    void setStepsize(unsigned int stepsize);
 
    void setKeyframesOnly(bool checked);
 
    void addWidgetToLayout(QWidget *widget);
 
    void removeWidgetFromLayout(QWidget *widget);
 
    void setColorTheme(ColorTheme theme);
 
    void setCropStatus(bool checked);
    bool getCropStatus();
 
    struct OverlayEntry {
        QString text;
        bool isHeader = false;
        Qt::TextElideMode elidMode = Qt::ElideRight;
    };
 
    void updateOverlayText(const QList<OverlayEntry> &content);
 
    void updateRoi(const QRect& roi = QRect());
    void clear();
 
signals:
 
    void sig_play();
 
    void sig_showNextImage();
 
    void sig_showPreviousImage();
 
    void sig_showFirstImage();
 
    void sig_showLastImage();
 
    void sig_toggleKeyframes();
 
    void sig_toggleKeyframesOnly(bool checked);
 
    void sig_changeStepsize(unsigned int stepsize);
 
    void sig_deleteAllKeyframes();
 
    void sig_cropEdit();
 
    void sig_useCropChanged(bool useCrop);
 
protected:
    void resizeEvent(QResizeEvent *e); // used to resize displayed image
 
private slots:
    void on_pushButton_firstPic_clicked();
    void on_pushButton_prevPic_clicked();
    void on_pushButton_playPause_clicked();
    void on_pushButton_nextPic_clicked();
    void on_pushButton_lastPic_clicked();
    void on_checkBox_onlyKeyframes_stateChanged(int arg1);
    void on_pushButton_setKeyframe_clicked();
    void on_spinBox_stepsize_valueChanged(int arg1);
    void on_pushButton_resetKeyframes_clicked();
 
private:
    Ui::VideoPlayer *ui;
    ColorTheme m_colorTheme;
    QShortcut *m_prevSC;
    QShortcut *m_nextSC;
 
    // This is the image item displayed in the graphics view
    QGraphicsItem *m_imageItem;
    QGraphicsRectItem *m_roiItem;
    QGraphicsItemGroup *m_visItemGroup;
 
    // Input Info Overlay
    QList<OverlayEntry> m_overlayEntries;
    QLabel *m_overlayLabel;
    QGraphicsOpacityEffect *m_overlayOpacityEffect;
 
    QImage qImageFromCvMat(const cv::Mat &input, bool bgr = true);
    void alphaBlend(cv::Mat *foreground, cv::Mat *background, float alpha, cv::Mat &output);
    void updateOverlay();
    bool checkOverlap();
    void displayDragNDropIcon();
};
 
#endif // VIDEOPLAYER_H