- Qt 5.5
- Qt Widgets
- Undo Framework
- document.h Example File
- Qt 5.5.1 Reference Documentation

# document.h Example File

tools/undo/document.h

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the demonstration applications of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:LGPL21$
    ** Commercial License Usage
    ** Licensees holding valid commercial Qt licenses may use this file in
    ** accordance with the commercial license agreement provided with the
    ** Software or, alternatively, in accordance with the terms contained in
    ** a written agreement between you and The Qt Company. For licensing terms
    ** and conditions see http://www.qt.io/terms-conditions. For further
    ** information use the contact form at http://www.qt.io/contact-us.
    **
    ** GNU Lesser General Public License Usage
    ** Alternatively, this file may be used under the terms of the GNU Lesser
    ** General Public License version 2.1 or version 3 as published by the Free
    ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
    ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
    ** following information to ensure the GNU Lesser General Public License
    ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
    ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
    **
    ** As a special exception, The Qt Company gives you certain additional
    ** rights. These rights are described in The Qt Company LGPL Exception
    ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
    **
    ** $QT_END_LICENSE$
    **
    ****************************************************************************/

    #ifndef DOCUMENT_H
    #define DOCUMENT_H

    #include <QWidget>

    QT_FORWARD_DECLARE_CLASS(QUndoStack)
    QT_FORWARD_DECLARE_CLASS(QTextStream)

    class Shape
    {
    public:
        enum Type { Rectangle, Circle, Triangle };

        explicit Shape(Type type = Rectangle, const QColor &color = Qt::red, const QRect &rect = QRect());

        Type type() const;
        QString name() const;
        QRect rect() const;
        QRect resizeHandle() const;
        QColor color() const;

        static QString typeToString(Type type);
        static Type stringToType(const QString &s, bool *ok = 0);

        static const QSize minSize;

    private:
        Type m_type;
        QRect m_rect;
        QColor m_color;
        QString m_name;

        friend class Document;
    };

    class Document : public QWidget
    {
        Q_OBJECT

    public:
        Document(QWidget *parent = 0);

        QString addShape(const Shape &shape);
        void deleteShape(const QString &shapeName);
        Shape shape(const QString &shapeName) const;
        QString currentShapeName() const;

        void setShapeRect(const QString &shapeName, const QRect &rect);
        void setShapeColor(const QString &shapeName, const QColor &color);

        bool load(QTextStream &stream);
        void save(QTextStream &stream);

        QString fileName() const;
        void setFileName(const QString &fileName);

        QUndoStack *undoStack() const;

    signals:
        void currentShapeChanged(const QString &shapeName);

    protected:
        void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
        void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
        void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
        void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;

    private:
        void setCurrentShape(int index);
        int indexOf(const QString &shapeName) const;
        int indexAt(const QPoint &pos) const;
        QString uniqueName(const QString &name) const;

        QList<Shape> m_shapeList;
        int m_currentIndex;
        int m_mousePressIndex;
        QPoint m_mousePressOffset;
        bool m_resizeHandlePressed;
        QString m_fileName;

        QUndoStack *m_undoStack;
    };

    #endif // DOCUMENT_H