pqPythonUndoCommand.h

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// SPDX-FileCopyrightText: Copyright (c) Kitware Inc.
// SPDX-FileCopyrightText: Copyright (c) Sandia Corporation
// SPDX-License-Identifier: BSD-3-Clause
#ifndef pqPythonUndoCommand_h
#define pqPythonUndoCommand_h

#include "pqPythonModule.h"

#include <QTextEdit>
#include <QUndoCommand>

#include <functional>
#include <iostream>
#include <stack>
#include <vector>

class pqPythonSyntaxHighlighter;

struct pqPythonTextHistoryEntry
{
  pqPythonTextHistoryEntry() = default;

  pqPythonTextHistoryEntry(const QString& txt, const std::int32_t cursorPos)
    : content(txt)
    , cursorPosition(cursorPos)
  {
  }

  QString content = "";

  std::int32_t cursorPosition = -1;

  bool isEmpty() const noexcept { return cursorPosition == -1; }
};

class PQPYTHON_EXPORT pqPythonUndoCommand : public QUndoCommand
{
public:
  pqPythonUndoCommand(QTextEdit& text, pqPythonSyntaxHighlighter* highlighter,
    pqPythonTextHistoryEntry& lastHistoryEntry,
    const pqPythonTextHistoryEntry&& currentHistoryEntry);

  void undo() override;

  void redo() override;

  const pqPythonTextHistoryEntry& getCurrentHistoryEntry() const
  {
    return this->CurrentHistoryEntry;
  }

private:
  void swapImpl(const pqPythonTextHistoryEntry& h);

  QTextEdit& Text;

  pqPythonSyntaxHighlighter* Highlighter;

  pqPythonTextHistoryEntry& TextLastHystoryEntry;

  const pqPythonTextHistoryEntry LastHistoryEntry;

  const pqPythonTextHistoryEntry CurrentHistoryEntry;
};

#endif // pqPythonUndoCommand_h