preview.hpp

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//
// Created by ColorsWind on 2022/5/8.
//
 
#pragma once
#include <QObject>
#include <QImage>
#include <QThread>
#include "private/previewer.hpp"
 
class Preview : public QObject {
    Q_OBJECT
private:
    Previewer *m_worker = nullptr;
    QThread *m_affinityThread;
public:
    Preview(QObject *parent) {
        m_affinityThread = new QThread;
        m_affinityThread->setObjectName("PreviewThread");
        this->moveToThread(m_affinityThread);
        m_affinityThread->start();
    }
 
    ~Preview() override {
        // set interrupt flag
        m_affinityThread->quit();
    }
 
 
public slots:
    void previewRequest(qreal pos) {
        if (m_worker) {
            auto ret = m_worker->previewRequest(pos);
            emit previewResponse(pos, std::move(ret), QPrivateSignal());
        }
    };
 
    void openFile(const QString &fn) {
        qDebug() << "Previewer: Open file" << fn;
        if (m_worker) {
            qWarning() << "Previewer: Already open file:" << m_worker->filename.c_str();
            emit openFileResult(false, QPrivateSignal());
            return;
        }
        try {
            m_worker = new Previewer(fn.toStdString(), this);
        } catch (std::runtime_error &ex) {
            qWarning() << "Previewer: Error opening file:" << ex.what();
            m_worker = nullptr;
            emit openFileResult(false, QPrivateSignal());
            return;
        }
        emit openFileResult(true, QPrivateSignal());
    }
 
    void close() {
        if (m_worker) {
            qDebug() << "Previewer: Close file" << m_worker->filename.c_str();
            m_worker->deleteLater();
            m_worker = nullptr;
        } else {
            qWarning() << "Previewer: Try to close file while no file has been opened.";
        }
    }
 
signals:
    void previewResponse(qreal pos, VideoFrameRef frame, QPrivateSignal);
 
    void openFileResult(bool ret, QPrivateSignal);
 
};