Recent file manager

PdfForQtViewer/pdfrecentfilemanager.h

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+//    Copyright (C) 2020 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt 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.
+//
+//    PdfForQt 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 PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef PDFRECENTFILEMANAGER_H
+#define PDFRECENTFILEMANAGER_H
+
+#include <QObject>
+#include <QAction>
+
+#include <array>
+
+namespace pdfviewer
+{
+
+/// Recent file manager, manages list of recent files.
+class PDFRecentFileManager : public QObject
+{
+    Q_OBJECT
+
+private:
+    using BaseClass = QObject;
+
+    static constexpr const int MAXIMUM_RECENT_FILES = 9;
+    static constexpr const int DEFAULT_RECENT_FILES = 5;
+
+public:
+    explicit PDFRecentFileManager(QObject* parent);
+
+    /// Adds recent file to recent file list and updates the actions.
+    /// New recent file is added as first file.
+    /// \param fileName New recent file
+    void addRecentFile(QString fileName);
+
+    /// Returns a list of recent files
+    const QStringList& getRecentFiles() const { return m_recentFiles; }
+
+    /// Sets a list of recent files, and udpates manager
+    void setRecentFiles(QStringList recentFiles);
+
+    /// Returns a limit of recent files count
+    int getRecentFilesLimit() const { return m_recentFilesLimit; }
+
+    /// Sets a new limit of recent files count
+    void setRecentFilesLimit(int recentFilesLimit);
+
+    /// Returns list of recent files actions
+    const std::array<QAction*, MAXIMUM_RECENT_FILES>& getActions() const { return m_actions; }
+
+    static constexpr int getMinimumRecentFiles() { return 1; }
+    static constexpr int getDefaultRecentFiles() { return DEFAULT_RECENT_FILES; }
+    static constexpr int getMaximumRecentFiles() { return MAXIMUM_RECENT_FILES; }
+
+signals:
+    void fileOpenRequest(QString fileName);
+
+private:
+    /// Updates recent files actions / recent file list
+    void update();
+
+    /// Reaction on recent file action triggered
+    void onRecentFileActionTriggered();
+
+    int m_recentFilesLimit;
+    std::array<QAction*, MAXIMUM_RECENT_FILES> m_actions;
+    QStringList m_recentFiles;
+};
+
+}   // namespace pdfviewer
+
+#endif // PDFRECENTFILEMANAGER_H