mirror of https://github.com/JakubMelka/PDF4QT.git
126 lines
3.2 KiB
C++
126 lines
3.2 KiB
C++
// Copyright (C) 2020-2023 Jakub Melka
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//
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// This file is part of PDF4QT.
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//
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// PDF4QT is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// with the written consent of the copyright owner, any later version.
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//
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// PDF4QT is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with PDF4QT. If not, see <https://www.gnu.org/licenses/>.
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#include "pdfundoredomanager.h"
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#include "pdfdbgheap.h"
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namespace pdfviewer
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{
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PDFUndoRedoManager::PDFUndoRedoManager(QObject* parent) :
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BaseClass(parent)
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{
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}
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PDFUndoRedoManager::~PDFUndoRedoManager()
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{
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}
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void PDFUndoRedoManager::doUndo()
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{
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if (!canUndo())
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{
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// Undo operation can't be performed
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return;
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}
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UndoRedoItem item = m_undoSteps.back();
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m_undoSteps.pop_back();
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m_isCurrentSaved = false;
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m_redoSteps.insert(m_redoSteps.begin(), item);
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clampUndoRedoSteps();
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Q_EMIT undoRedoStateChanged();
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Q_EMIT documentChangeRequest(pdf::PDFModifiedDocument(item.oldDocument, nullptr, item.flags));
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}
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void PDFUndoRedoManager::doRedo()
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{
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if (!canRedo())
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{
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// Redo operation can't be performed
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return;
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}
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UndoRedoItem item = m_redoSteps.front();
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m_redoSteps.erase(m_redoSteps.begin());
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m_isCurrentSaved = false;
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m_undoSteps.push_back(item);
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clampUndoRedoSteps();
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Q_EMIT undoRedoStateChanged();
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Q_EMIT documentChangeRequest(pdf::PDFModifiedDocument(item.newDocument, nullptr, item.flags));
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}
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void PDFUndoRedoManager::clear()
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{
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if (canUndo() || canRedo())
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{
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m_undoSteps.clear();
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m_redoSteps.clear();
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Q_EMIT undoRedoStateChanged();
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}
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}
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void PDFUndoRedoManager::createUndo(pdf::PDFModifiedDocument document, pdf::PDFDocumentPointer oldDocument)
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{
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m_undoSteps.emplace_back(oldDocument, document, document.getFlags());
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m_redoSteps.clear();
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m_isCurrentSaved = false;
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clampUndoRedoSteps();
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Q_EMIT undoRedoStateChanged();
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}
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void PDFUndoRedoManager::setMaximumSteps(size_t undoLimit, size_t redoLimit)
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{
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if (m_undoLimit != undoLimit || m_redoLimit != redoLimit)
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{
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m_undoLimit = undoLimit;
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m_redoLimit = redoLimit;
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clampUndoRedoSteps();
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Q_EMIT undoRedoStateChanged();
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}
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}
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void PDFUndoRedoManager::clampUndoRedoSteps()
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{
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if (m_undoSteps.size() > m_undoLimit)
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{
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// We erase from oldest steps to newest
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m_undoSteps.erase(m_undoSteps.begin(), std::next(m_undoSteps.begin(), m_undoSteps.size() - m_undoLimit));
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}
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if (m_redoSteps.size() > m_redoLimit)
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{
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// Newest steps are erased
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m_redoSteps.resize(m_redoLimit);
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}
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}
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bool PDFUndoRedoManager::isCurrentSaved() const
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{
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return m_isCurrentSaved;
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}
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void PDFUndoRedoManager::setIsCurrentSaved(bool newIsCurrentSaved)
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{
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m_isCurrentSaved = newIsCurrentSaved;
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}
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} // namespace pdfviewer
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