document.h Example File

tools/undo/document.h
 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the demonstration applications of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** 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 https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** BSD License Usage
 ** Alternatively, you may use this file under the terms of the BSD license
 ** as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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) override;
     void mousePressEvent(QMouseEvent *event) override;
     void mouseReleaseEvent(QMouseEvent *event) override;
     void mouseMoveEvent(QMouseEvent *event) 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