diagramscene.h Example File | Qt Widgets 5.12.5

Qt 5.12 | Qt Widgets | Diagram Scene Example | diagramscene.h Example File

Qt 5.12.5 Reference Documentation

# diagramscene.h Example File

graphicsview/diagramscene/diagramscene.h

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the examples 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 DIAGRAMSCENE_H
      #define DIAGRAMSCENE_H

      #include "diagramitem.h"
      #include "diagramtextitem.h"

      #include <QGraphicsScene>

      class QGraphicsSceneMouseEvent;
      class QMenu;
      class QPointF;
      class QGraphicsLineItem;
      class QFont;
      class QGraphicsTextItem;
      class QColor;

      class DiagramScene : public QGraphicsScene
      {
          Q_OBJECT

      public:
          enum Mode { InsertItem, InsertLine, InsertText, MoveItem };

          explicit DiagramScene(QMenu *itemMenu, QObject *parent = 0);
          QFont font() const { return myFont; }
          QColor textColor() const { return myTextColor; }
          QColor itemColor() const { return myItemColor; }
          QColor lineColor() const { return myLineColor; }
          void setLineColor(const QColor &color);
          void setTextColor(const QColor &color);
          void setItemColor(const QColor &color);
          void setFont(const QFont &font);

      public slots:
          void setMode(Mode mode);
          void setItemType(DiagramItem::DiagramType type);
          void editorLostFocus(DiagramTextItem *item);

      signals:
          void itemInserted(DiagramItem *item);
          void textInserted(QGraphicsTextItem *item);
          void itemSelected(QGraphicsItem *item);

      protected:
          void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent) override;
          void mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent) override;
          void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent) override;

      private:
          bool isItemChange(int type);

          DiagramItem::DiagramType myItemType;
          QMenu *myItemMenu;
          Mode myMode;
          bool leftButtonDown;
          QPointF startPoint;
          QGraphicsLineItem *line;
          QFont myFont;
          DiagramTextItem *textItem;
          QColor myTextColor;
          QColor myItemColor;
          QColor myLineColor;
      };

      #endif // DIAGRAMSCENE_H