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

© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.