mirror of https://github.com/JakubMelka/PDF4QT.git
113 lines
2.9 KiB
C++
113 lines
2.9 KiB
C++
// Copyright (C) 2020-2022 Jakub Melka
|
|
//
|
|
// This file is part of PDF4QT.
|
|
//
|
|
// PDF4QT is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// with the written consent of the copyright owner, any later version.
|
|
//
|
|
// PDF4QT 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 Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with PDF4QT. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
#include "pdfundoredomanager.h"
|
|
#include "pdfdbgheap.h"
|
|
|
|
namespace pdfviewer
|
|
{
|
|
|
|
PDFUndoRedoManager::PDFUndoRedoManager(QObject* parent) :
|
|
BaseClass(parent)
|
|
{
|
|
|
|
}
|
|
|
|
PDFUndoRedoManager::~PDFUndoRedoManager()
|
|
{
|
|
|
|
}
|
|
|
|
void PDFUndoRedoManager::doUndo()
|
|
{
|
|
if (!canUndo())
|
|
{
|
|
// Undo operation can't be performed
|
|
return;
|
|
}
|
|
|
|
UndoRedoItem item = m_undoSteps.back();
|
|
m_undoSteps.pop_back();
|
|
m_redoSteps.insert(m_redoSteps.begin(), item);
|
|
clampUndoRedoSteps();
|
|
|
|
emit undoRedoStateChanged();
|
|
emit documentChangeRequest(pdf::PDFModifiedDocument(item.oldDocument, nullptr, item.flags));
|
|
}
|
|
|
|
void PDFUndoRedoManager::doRedo()
|
|
{
|
|
if (!canRedo())
|
|
{
|
|
// Redo operation can't be performed
|
|
return;
|
|
}
|
|
|
|
UndoRedoItem item = m_redoSteps.front();
|
|
m_redoSteps.erase(m_redoSteps.begin());
|
|
m_undoSteps.push_back(item);
|
|
clampUndoRedoSteps();
|
|
|
|
emit undoRedoStateChanged();
|
|
emit documentChangeRequest(pdf::PDFModifiedDocument(item.newDocument, nullptr, item.flags));
|
|
}
|
|
|
|
void PDFUndoRedoManager::clear()
|
|
{
|
|
if (canUndo() || canRedo())
|
|
{
|
|
m_undoSteps.clear();
|
|
m_redoSteps.clear();
|
|
emit undoRedoStateChanged();
|
|
}
|
|
}
|
|
|
|
void PDFUndoRedoManager::createUndo(pdf::PDFModifiedDocument document, pdf::PDFDocumentPointer oldDocument)
|
|
{
|
|
m_undoSteps.emplace_back(oldDocument, document, document.getFlags());
|
|
m_redoSteps.clear();
|
|
clampUndoRedoSteps();
|
|
emit undoRedoStateChanged();
|
|
}
|
|
|
|
void PDFUndoRedoManager::setMaximumSteps(size_t undoLimit, size_t redoLimit)
|
|
{
|
|
if (m_undoLimit != undoLimit || m_redoLimit != redoLimit)
|
|
{
|
|
m_undoLimit = undoLimit;
|
|
m_redoLimit = redoLimit;
|
|
clampUndoRedoSteps();
|
|
emit undoRedoStateChanged();
|
|
}
|
|
}
|
|
|
|
void PDFUndoRedoManager::clampUndoRedoSteps()
|
|
{
|
|
if (m_undoSteps.size() > m_undoLimit)
|
|
{
|
|
// We erase from oldest steps to newest
|
|
m_undoSteps.erase(m_undoSteps.begin(), std::next(m_undoSteps.begin(), m_undoSteps.size() - m_undoLimit));
|
|
}
|
|
if (m_redoSteps.size() > m_redoLimit)
|
|
{
|
|
// Newest steps are erased
|
|
m_redoSteps.resize(m_redoLimit);
|
|
}
|
|
}
|
|
|
|
} // namespace pdfviewer
|