Jim Evins
122 lines
2.4 KiB
C++
122 lines
2.4 KiB
C++
/* UndoRedoModel.h
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*
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* Copyright (C) 2016 Jim Evins <evins@snaught.com>
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*
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* This file is part of gLabels-qt.
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*
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* gLabels-qt is free software: you can redistribute it and/or modify
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* it under the terms of the GNU 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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* (at your option) any later version.
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*
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* gLabels-qt 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with gLabels-qt. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef UndoRedoModel_h
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#define UndoRedoModel_h
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#include <QList>
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#include <QObject>
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#include <QString>
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// Forward references
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class LabelModel;
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///
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/// UndoRedoModel
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///
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struct UndoRedoModel : QObject
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{
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Q_OBJECT
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/////////////////////////////////
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// Life Cycle
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/////////////////////////////////
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public:
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UndoRedoModel( LabelModel* model );
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virtual ~UndoRedoModel();
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/////////////////////////////////
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// Public Methods
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/////////////////////////////////
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public:
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void checkpoint( const QString& description );
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void undo();
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void redo();
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bool canUndo() const;
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bool canRedo() const;
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QString undoDescription() const;
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QString redoDescription() const;
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/////////////////////////////////
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// Slots
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/////////////////////////////////
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private slots:
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void onSelectionChanged();
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/////////////////////////////////
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// Signals
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/////////////////////////////////
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signals:
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void changed();
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/////////////////////////////////
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// Private types
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/////////////////////////////////
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private:
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class State
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{
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public:
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State( LabelModel* model, const QString& description );
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~State();
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LabelModel* model;
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QString description;
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};
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class Stack
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{
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public:
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Stack();
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~Stack();
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void push( State* state );
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State* pop();
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const State* topState() const;
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bool isEmpty() const;
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void clear();
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private:
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QList<State*> list;
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};
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/////////////////////////////////
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// Private data
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/////////////////////////////////
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private:
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LabelModel *mModel;
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Stack mUndoStack;
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Stack mRedoStack;
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bool mNewSelection;
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QString mLastDescription;
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};
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#endif // UndoRedoModel_h
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