Mark unmark files from database view

databaseview.h

@@ -15,7 +15,7 @@ class SelectColumnsDialog : public QDialog
     Q_OBJECT
     QListWidget *m_listWidget;
 public:
-    SelectColumnsDialog(QWidget *parent = nullptr);
+    explicit SelectColumnsDialog(QWidget *parent = nullptr);
     void setColumns(QStringList columns);
     QStringList selectedColumns();
 };
@@ -28,7 +28,7 @@ class FITSFileModel : public QSqlQueryModel
     QStringList m_key;
     QStringList m_value;
 public:
-    FITSFileModel(QObject *parent = nullptr);
+    explicit FITSFileModel(QObject *parent = nullptr);
     void sort(int column, Qt::SortOrder order) override;
     void setColumns(const QStringList &columns);
     void setFilter(const QStringList &key, const QStringList &value);
@@ -36,11 +36,23 @@ protected:
     void prepareQuery();
 };
 
+class DatabaseTableView : public QTableView
+{
+    Q_OBJECT
+public:
+    explicit DatabaseTableView(QWidget *parent = nullptr);
+protected:
+    void contextMenuEvent(QContextMenuEvent *event) override;
+signals:
+    void filesMarked(QModelIndexList indexes);
+    void filesUnmarked(QModelIndexList indexes);
+};
+
 class DataBaseView : public QWidget
 {
     Q_OBJECT
     Database *m_database;
-    QTableView *m_tableView;
+    DatabaseTableView *m_tableView;
     FITSFileModel *m_model;
     QComboBox *m_filterKeyword[3];
     QLineEdit *m_search[3];