Issue #118: First part of splitting

Pdf4QtLibCore/sources/pdfprogress.h

@@ -0,0 +1,63 @@
+//    Copyright (C) 2019-2021 Jakub Melka
+//
+//    This file is part of PDF4QT.
+//
+//    PDF4QT is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    with the written consent of the copyright owner, any later version.
+//
+//    PDF4QT is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDF4QT.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef PDFPROGRESS_H
+#define PDFPROGRESS_H
+
+#include "pdfglobal.h"
+
+#include <QObject>
+
+#include <atomic>
+
+namespace pdf
+{
+
+struct ProgressStartupInfo
+{
+    bool showDialog = false;
+    QString text;
+};
+
+class PDF4QTLIBSHARED_EXPORT PDFProgress : public QObject
+{
+    Q_OBJECT
+
+public:
+    explicit PDFProgress(QObject* parent);
+
+    void start(size_t stepCount, ProgressStartupInfo startupInfo);
+    void step();
+    void finish();
+
+signals:
+    // Namespace pdf:: must be here, due to queued signals calling
+    void progressStarted(pdf::ProgressStartupInfo info);
+    void progressStep(int percentage);
+    void progressFinished();
+
+private:
+    std::atomic<size_t> m_currentStep = 0;
+    std::atomic<size_t> m_stepCount = 0;
+    std::atomic<int> m_percentage = 0;
+};
+
+}   // namespace pdf
+
+Q_DECLARE_METATYPE(pdf::ProgressStartupInfo)
+
+#endif // PDFPROGRESS_H