mirror of
https://github.com/JakubMelka/PDF4QT.git
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117 lines
3.9 KiB
C++
117 lines
3.9 KiB
C++
// MIT License
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//
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// Copyright (c) 2018-2025 Jakub Melka and Contributors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#ifndef PDFUNDOREDOMANAGER_H
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#define PDFUNDOREDOMANAGER_H
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#include "pdfdocument.h"
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#include <QObject>
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namespace pdfviewer
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{
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/// Undo/Redo document manager, it is managing undo and redo steps,
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/// when document is modified.
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class PDFUndoRedoManager : public QObject
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{
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Q_OBJECT
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private:
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using BaseClass = QObject;
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public:
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explicit PDFUndoRedoManager(QObject* parent);
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virtual ~PDFUndoRedoManager() override;
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bool canUndo() const { return !m_undoSteps.empty(); }
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bool canRedo() const { return !m_redoSteps.empty(); }
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/// Performs single undo step. If Undo action can't be performed,
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/// then nothing happens.
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void doUndo();
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/// Performs single redo step. If Redo action can't be performed,
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/// then nothing happens.
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void doRedo();
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/// Clears all undo/redo steps
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void clear();
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/// Create undo action (after document modification)
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/// \param document Document created by modification
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/// \param oldDocument Old document
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void createUndo(pdf::PDFModifiedDocument document, pdf::PDFDocumentPointer oldDocument);
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/// Sets maximum steps for undo/redo
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/// \param undoLimit Maximum undo steps
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/// \param redoLimit Maximum redo steps
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void setMaximumSteps(size_t undoLimit, size_t redoLimit);
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/// Returns true, if document was saved
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bool isCurrentSaved() const;
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/// Sets flag, if document was saved
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void setIsCurrentSaved(bool newIsCurrentSaved = true);
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signals:
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/// This signals are emitted, when undo/redo action availability has
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/// been changed (for example, user pressed undo/redo action)
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void undoRedoStateChanged();
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/// This signal is being emitted, when user performs undo/redo action.
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/// Before signal is emitted, this object is in corrected state, as action
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/// is performed.
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/// \param document Document
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void documentChangeRequest(pdf::PDFModifiedDocument document);
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private:
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/// Clamps undo/redo steps so they fit the limits
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void clampUndoRedoSteps();
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struct UndoRedoItem
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{
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explicit inline UndoRedoItem() = default;
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explicit inline UndoRedoItem(pdf::PDFDocumentPointer oldDocument, pdf::PDFDocumentPointer newDocument, pdf::PDFModifiedDocument::ModificationFlags flags) :
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oldDocument(qMove(oldDocument)),
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newDocument(qMove(newDocument)),
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flags(flags)
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{
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}
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pdf::PDFDocumentPointer oldDocument;
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pdf::PDFDocumentPointer newDocument;
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pdf::PDFModifiedDocument::ModificationFlags flags = pdf::PDFModifiedDocument::None;
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};
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size_t m_undoLimit = 0;
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size_t m_redoLimit = 0;
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std::vector<UndoRedoItem> m_undoSteps;
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std::vector<UndoRedoItem> m_redoSteps;
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bool m_isCurrentSaved = true;
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};
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} // namespace pdfviewer
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#endif // PDFUNDOREDOMANAGER_H
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