utils/themeeditor/graphics/rbmovable.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2010 Robert Bieber
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21
  22 #ifndef RBMOVABLE_H
  23 #define RBMOVABLE_H
  24
  25 #include <QGraphicsItem>
  26
  27 /*
  28  * This is a base class for scene elements that can be moved around and
  29  * resized. It adds some basic functionality for showing a border around
  30  * selected items and ensuring that they don't get moved out of their parent's
  31  * bounding rect, as well as resizing them. It includes one pure virtual
  32  * function, saveGeometry(), that is responsible for syncing the changed
  33  * geometry back to the parse tree to be code gen'd into the file.
  34  */
  35
  36 class RBMovable : public QGraphicsItem
  37 {
  38 public:
  39     RBMovable(QGraphicsItem* parent);
  40     ~RBMovable();
  41
  42     virtual void paint(QPainter *painter,
  43                        const QStyleOptionGraphicsItem *option, QWidget *widget);
  44     virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
  45     virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
  46     virtual void mouseReleaseEvent(QGraphicsSceneMouseEvent *event);
  47
  48     virtual QRectF boundingRect() const{ return size; }
  49
  50 protected:
  51     virtual QVariant itemChange(GraphicsItemChange change,
  52                                 const QVariant &value);
  53     /* Responsible for updating the parse tree */
  54     virtual void saveGeometry() = 0;
  55
  56     QRectF size;
  57
  58 private:
  59     static const double handleSize;
  60
  61     QRectF topLeftHandle();
  62     QRectF topRightHandle();
  63     QRectF bottomLeftHandle();
  64     QRectF bottomRightHandle();
  65
  66     enum{
  67         None,
  68         TopLeft,
  69         TopRight,
  70         BottomLeft,
  71         BottomRight
  72     } dragMode;
  73     QPointF dragStartPos;
  74     QRectF dragStartSize;
  75     QPointF dragStartClick;
  76     double dHeightMin;
  77     double dHeightMax;
  78     double dWidthMin;
  79     double dWidthMax;
  80
  81 };
  82
  83 #endif // RBMOVABLE_H