MatrixScrollbars.h

// -*- mode: c++; c-file-style: "linux"; c-basic-offset: 2; indent-tabs-mode: nil -*-
//
//  Copyright (C) 2026 Gunter Königsmann <wxMaxima@physikbuch.de>
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  This program 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 General Public License for more details.
//
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
//
//  SPDX-License-Identifier: GPL-2.0+
 
#ifndef MATRIXSCROLLBARS_H
#define MATRIXSCROLLBARS_H
 
#include "cells/CellPtr.h"
#include "cells/MatrCell.h"
#include "cells/MatrixScrollHost.h"
 
#include <wx/region.h>
#include <wx/scrolbar.h>
#include <wx/scrolwin.h>
 
#include <memory>
#include <vector>
 
class MatrixScrollbars final : public MatrixScrollHost
{
public:
  explicit MatrixScrollbars(wxScrolled<wxWindow> *worksheet);
  ~MatrixScrollbars() override;
  MatrixScrollbars(const MatrixScrollbars &) = delete;
  MatrixScrollbars &operator=(const MatrixScrollbars &) = delete;
 
  wxCoord ScrollbarThickness() const override;
  void MatrixDrawn(MatrCell *matrix) override;
 
  void BeginPaint();
  void EndPaint(const wxRegion &updateRegion);
  void Sync();
 
  size_t VisibleScrollbars() const;
 
private:
  struct Entry
  {
    CellPtr<MatrCell> matrix;
    wxScrollBar *horizontal = nullptr;
    wxScrollBar *vertical = nullptr;
    bool drawnThisPaint = false;
    bool shown = false;
    wxRect lastDrawnAt;
  };
 
  void SyncScrollbar(wxScrollBar *&scrollbar, int orientation, bool wanted,
                     const wxRect &where, int position, int thumbSize,
                     int range);
  void OnScroll(wxScrollEvent &event);
  static void DestroyScrollbars(Entry &entry);
 
  wxScrolled<wxWindow> *const m_worksheet;
  std::vector<std::unique_ptr<Entry>> m_entries;
  bool m_syncPending = false;
};
 
#endif // MATRIXSCROLLBARS_H