    //=============================================================================
    //  MuseScore
    //  Music Composition & Notation
    //  $Id: palettebox.h 5576 2012-04-24 19:15:22Z wschweer $
    //
    //  Copyright (C) 2011-2016 Werner Schweer and others
    //
    //  This program is free software; you can redistribute it and/or modify
    //  it under the terms of the GNU General Public License version 2
    //  as published by the Free Software Foundation and appearing in
    //  the file LICENSE.GPL
    //=============================================================================

    #ifndef __PALETTE_BOX_H__
    #define __PALETTE_BOX_H__

    #include "paletteBoxButton.h"

    namespace Ms {

    class XmlWriter;
    class XmlReader;
    class Palette;

    //---------------------------------------------------------
    //   PaletteBox
    //---------------------------------------------------------

    class PaletteBox : public QDockWidget {
          Q_OBJECT

          QVBoxLayout* vbox;
          Palette* newPalette(const QString& name, int slot);
          QComboBox* workspaceList;
          QLineEdit* _searchBox;
          const int paletteStretch = 1000;
          QAction* singlePaletteAction;
          QToolButton* addWorkspaceButton;
          bool keyboardNavigation = false;

       private slots:
          void paletteCmd(PaletteCommand, int);
          void closeAll();
          void workspaceSelected(int idx);
          void newWorkspaceClicked();
          void setSinglePalette(bool);
          void filterPalettes(const QString& text);

       signals:
          void changed();

       private:
          void changeEvent(QEvent *event);
          void retranslate();

       public:
          PaletteBox(QWidget* parent = 0);
          void addPalette(Palette*);
          void write(XmlWriter&);
          bool read(XmlReader&);
          void clear();
          QList<Palette*> palettes() const;
          void updateWorkspaces();
          QLineEdit* searchBox() { return _searchBox; }
          bool noSelection();
          void mousePressEvent(QMouseEvent* ev, Palette* p1);
          void navigation(QKeyEvent *event);
          bool eventFilter(QObject* obj, QEvent *event);
          void setKeyboardNavigation(bool val) { keyboardNavigation = val; }
          bool getKeyboardNavigation() { return keyboardNavigation; }
          };

    //---------------------------------------------------------
    //   PaletteBoxScrollArea
    //---------------------------------------------------------

    class PaletteBoxScrollArea : public QScrollArea {
           Q_OBJECT

        public:
          virtual QSize sizeHint() const;
          };

    } // namespace Ms
    #endif

↑ V762 It is possible a virtual function was overridden incorrectly. See second argument of function 'mousePressEvent' in derived class 'PaletteBox' and base class 'QWidget'.