Output preview plugin

Pdf4QtViewerPlugins/OutputPreviewPlugin/outputpreviewplugin.h

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+//    Copyright (C) 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
+//    (at your option) 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 OUTPUTPREVIEWPLUGIN_H
+#define OUTPUTPREVIEWPLUGIN_H
+
+#include "pdfplugin.h"
+
+#include <QObject>
+
+namespace pdfplugin
+{
+
+class OutputPreviewPlugin : public pdf::PDFPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "Pdf4Qt.OutputPreviewPlugin" FILE "OutputPreviewPlugin.json")
+
+private:
+    using BaseClass = pdf::PDFPlugin;
+
+public:
+    OutputPreviewPlugin();
+
+    virtual void setWidget(pdf::PDFWidget* widget) override;
+    virtual void setDocument(const pdf::PDFModifiedDocument& document) override;
+    virtual std::vector<QAction*> getActions() const override;
+
+private:
+    void onOutputPreviewTriggered();
+    void updateActions();
+
+    QAction* m_outputPreviewAction;
+};
+
+}   // namespace pdfplugin
+
+#endif // OUTPUTPREVIEWPLUGIN_H