variable-editor-model.h

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2013-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave 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 3 of the License, or
// (at your option) any later version.
//
// Octave 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 Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////
 
#if ! defined (octave_variable_editor_model_h)
#define octave_variable_editor_model_h 1
 
#include <QAbstractTableModel>
#include <QMap>
#include <QString>
 
#include "qt-interpreter-events.h"
 
#include "ov.h"
#include "pr-flt-fmt.h"
 
namespace octave
{
  class interpreter;
 
  class base_ve_model
  {
  public:
 
    base_ve_model (const QString &expr, const octave_value& val);
 
    virtual ~base_ve_model (void) = default;
 
    // No copying!
 
    base_ve_model (const base_ve_model&) = delete;
 
    base_ve_model& operator = (const base_ve_model&) = delete;
 
    virtual void maybe_resize_rows (int) { }
 
    virtual void maybe_resize_columns (int) { }
 
    std::string name (void) const;
 
    bool index_ok (const QModelIndex& idx, int& row, int& col) const;
 
    virtual bool is_editable (void) const { return true; }
 
    virtual octave_value value_at (const QModelIndex& idx) const;
 
    int column_width (void) const;
 
    int rowCount (const QModelIndex& = QModelIndex ()) const;
 
    int columnCount (const QModelIndex& = QModelIndex ()) const;
 
    QString edit_display_sub (const octave_value& elt, int role) const;
 
    virtual QVariant edit_display (const QModelIndex& idx, int role) const;
 
    QVariant data (const QModelIndex& idx, int role = Qt::DisplayRole) const;
 
    virtual bool requires_sub_editor (const QModelIndex& idx) const;
 
    void set_update_pending (const QModelIndex& idx, const QString& str);
 
    bool update_pending (const QModelIndex& idx) const;
 
    QString update_pending_data (const QModelIndex& idx) const;
 
    void clear_update_pending (void);
 
    virtual char quote_char (const QModelIndex& idx) const;
 
    virtual QVariant
    header_data (int section, Qt::Orientation orientation, int role) const;
 
    // Return a subscript expression as a string that can be used to
    // access a sub-element of a data structure.  For example "{1,3}"
    // for cell array element {1,3} or "(2,4)" for array element (2,4).
 
    virtual QString subscript_expression (const QModelIndex& idx) const;
 
    bool is_valid (void) const { return m_valid; }
 
    octave_idx_type data_rows (void) const { return m_data_rows; }
 
    octave_idx_type data_columns (void) const { return m_data_cols; }
 
    int display_rows (void) const { return m_display_rows; }
 
    int display_columns (void) const { return m_display_cols; }
 
    virtual QString make_description_text (void) const;
 
    void reset (const octave_value& val);
 
  protected:
 
    std::string m_name;
 
    octave_value m_value;
 
    octave_idx_type m_data_rows;
    octave_idx_type m_data_cols;
 
    // Qt table widget limits the size to int.
    int m_display_rows;
    int m_display_cols;
 
    QMap<QModelIndex, QString> m_update_pending;
 
    bool m_valid;
 
    float_display_format m_display_fmt;
  };
 
  class variable_editor_model : public QAbstractTableModel
  {
    Q_OBJECT
 
  private:
 
    static base_ve_model * create (const QString &expr, const octave_value& val);
 
  public:
 
    variable_editor_model (const QString &expr, const octave_value& val,
                           QObject *parent = nullptr);
 
    ~variable_editor_model (void)
    {
      delete rep;
    }
 
    // No copying!
 
    variable_editor_model (const variable_editor_model&) = delete;
 
    variable_editor_model& operator = (const variable_editor_model&) = delete;
 
    std::string name (void) const
    {
      return rep->name ();
    }
 
    bool is_editable (void) const
    {
      return rep->is_editable ();
    }
 
    octave_value value_at (const QModelIndex& idx) const
    {
      return rep->value_at (idx);
    }
 
    int column_width (void) const
    {
      return rep->column_width ();
    }
 
    int rowCount (const QModelIndex& idx = QModelIndex ()) const
    {
      return rep->rowCount (idx);
    }
 
    int columnCount (const QModelIndex& idx = QModelIndex ()) const
    {
      return rep->columnCount (idx);
    }
 
    QVariant data (const QModelIndex& idx = QModelIndex (),
                   int role = Qt::DisplayRole) const
    {
      return rep->data (idx, role);
    }
 
    bool setData (const QModelIndex& idx, const QVariant& v,
                  int role = Qt::EditRole);
 
    bool clear_content (const QModelIndex& idx);
 
    Qt::ItemFlags flags (const QModelIndex& idx) const;
 
    bool insertRows (int row, int count,
                     const QModelIndex& parent = QModelIndex());
 
    bool removeRows (int row, int count,
                     const QModelIndex& parent = QModelIndex());
 
    bool insertColumns (int column, int count,
                        const QModelIndex& parent = QModelIndex());
 
    bool removeColumns (int column, int count,
                        const QModelIndex& parent = QModelIndex());
 
    // Is cell at idx complex enough to require a sub editor?
 
    bool requires_sub_editor (const QModelIndex& idx) const
    {
      return rep->requires_sub_editor (idx);
    }
 
    void set_update_pending (const QModelIndex& idx, const QString& str)
    {
      rep->set_update_pending (idx, str);
    }
 
    bool update_pending (const QModelIndex& idx) const
    {
      return rep->update_pending (idx);
    }
 
    QString update_pending_data (const QModelIndex& idx) const
    {
      return rep->update_pending_data (idx);
    }
 
    void clear_update_pending (void)
    {
      rep->clear_update_pending ();
    }
 
    char quote_char (const QModelIndex& idx) const
    {
      return rep->quote_char (idx);
    }
 
    QVariant
    headerData (int section, Qt::Orientation orientation, int role) const
    {
      return rep->header_data (section, orientation, role);
    }
 
    // Return a subscript expression as a string that can be used to
    // access a sub-element of a data structure.  For example "{1,3}"
    // for cell array element {1,3} or "(2,4)" for array element (2,4).
 
    QString subscript_expression (const QModelIndex& idx) const
    {
      return rep->subscript_expression (idx);
    }
 
    int display_rows (void) const
    {
      return rep->display_rows ();
    }
 
    octave_idx_type data_rows (void) const
    {
      return rep->data_rows ();
    }
 
    int display_columns (void) const
    {
      return rep->display_columns ();
    }
 
    octave_idx_type data_columns (void) const
    {
      return rep->data_columns ();
    }
 
    void maybe_resize_rows (int rows);
 
    void maybe_resize_columns (int cols);
 
  signals:
 
    void update_data_signal (const octave_value& val);
 
    void data_error_signal (const QString& name) const;
 
    void user_error_signal (const QString& title, const QString& msg) const;
 
    void set_editable_signal (bool);
 
    void description_changed (const QString& description);
 
    void edit_variable_signal (const QString& name, const octave_value& val);
 
    void interpreter_event (const fcn_callback& fcn);
    void interpreter_event (const meth_callback& meth);
 
  public slots:
 
    void update_data (const octave_value& val);
 
    void update_data_cache (void);
 
    void double_click (const QModelIndex& idx);
 
  private slots:
 
    void data_error (const QString& msg);
 
    void user_error (const QString& title, const QString& msg);
 
  private:
 
    base_ve_model *rep;
 
    void init_from_oct (interpreter& interp);
 
    void eval_expr_event (const QString& expr);
 
    octave_value retrieve_variable (interpreter&, const std::string& name);
 
    bool is_valid (void) const
    {
      return rep->is_valid ();
    }
 
    void change_display_size (int old_rows, int old_cols,
                              int new_rows, int new_cols);
 
    QString make_description_text (void) const
    {
      return rep->make_description_text ();
    }
 
    void reset (const octave_value& val);
 
    void invalidate (void);
 
    void update_description (const QString& description = QString ());
 
    void evaluation_error (const std::string& expr) const;
  };
}
 
#endif