// Copyright (c) 2008  GeometryFactory Sarl (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v5.1/GraphicsView/include/CGAL/Qt/GraphicsViewIsoRectangleInput.h $
// $Id: GraphicsViewIsoRectangleInput.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s)     : Andreas Fabri <Andreas.Fabri@geometryfactory.com>
//                 Laurent Rineau <Laurent.Rineau@geometryfactory.com>

#ifndef CGAL_QT_GRAPHICS_VIEW_ISO_RECTANGLE_INPUT_H
#define CGAL_QT_GRAPHICS_VIEW_ISO_RECTANGLE_INPUT_H

#include <CGAL/license/GraphicsView.h>


#include <QGraphicsView>
#include <QRectF>
#include <QPointF>
#include <QGraphicsItem>
#include <QGraphicsRectItem>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QPainter>
#include <QStyleOption>
#include <QKeyEvent>

#include <CGAL/Qt/Converter.h>
#include <CGAL/Qt/GraphicsViewInput.h>

#include <CGAL/array.h>

namespace CGAL {
namespace Qt {

template <typename K>
class GraphicsViewIsoRectangleInput : public GraphicsViewInput
{
public:
  GraphicsViewIsoRectangleInput(QObject *parent, QGraphicsScene* s);
  ~GraphicsViewIsoRectangleInput();

protected:

  virtual void mousePressEvent(QGraphicsSceneMouseEvent *event);
  virtual void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
  virtual void keyPressEvent(QKeyEvent *event);

  bool eventFilter(QObject *obj, QEvent *event);




private:

  typedef typename K::Point_2 Point_2;
  QPointF qp, qq, qr;
  Point_2 p, q, r;
  QGraphicsRectItem *rectItem;
  QPointF rect_first_point;
  QGraphicsScene *scene_;
  Converter<K> convert;
};


template <typename K>
GraphicsViewIsoRectangleInput<K>::GraphicsViewIsoRectangleInput(QObject *parent, QGraphicsScene* s)
  : GraphicsViewInput(parent), rectItem(new QGraphicsRectItem), scene_(s)
{
  rectItem->setBrush(QBrush());
  scene_->addItem(rectItem);
  rectItem->hide();
  rectItem->setZValue(10000);
}

template <typename K>
GraphicsViewIsoRectangleInput<K>::~GraphicsViewIsoRectangleInput()
{
  delete rectItem;
}


template <typename K>
void
GraphicsViewIsoRectangleInput<K>::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
  if(event->modifiers()  & ::Qt::ShiftModifier){
    return;
  }
  if(event->button() == ::Qt::LeftButton) {
    if(rectItem->isVisible()) {
      // we have clicked twice
      Q_EMIT generate(CGAL::make_object(convert(rectItem->rect())));
      rectItem->hide();
    } else {
      // we enter a first point
      rect_first_point = event->scenePos();
      rectItem->setRect(QRectF(rect_first_point, rect_first_point));
      rectItem->show();
    }
  }
}


template <typename K>
void
GraphicsViewIsoRectangleInput<K>::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
  // todo: only do this if no modifiers are pressed at the same time
  if(rectItem->isVisible()) {
    rectItem->setRect(QRectF(rect_first_point,
                             event->scenePos()));
  }
}


template <typename K>
void
GraphicsViewIsoRectangleInput<K>::keyPressEvent ( QKeyEvent * event )
{
}



template <typename K>
bool
GraphicsViewIsoRectangleInput<K>::eventFilter(QObject *obj, QEvent *event)
{
  if (event->type() == QEvent::GraphicsSceneMousePress) {
    QGraphicsSceneMouseEvent *mouseEvent = static_cast<QGraphicsSceneMouseEvent *>(event);
    mousePressEvent(mouseEvent);
    return true;
  } else if (event->type() == QEvent::GraphicsSceneMouseMove) {
    QGraphicsSceneMouseEvent *mouseEvent = static_cast<QGraphicsSceneMouseEvent *>(event);
    mouseMoveEvent(mouseEvent);
    return true;
  } else if (event->type() == QEvent::KeyPress) {
    QKeyEvent *keyEvent = static_cast<QKeyEvent *>(event);
    keyPressEvent(keyEvent);
    return true;
  } else{
    // standard event processing
    return QObject::eventFilter(obj, event);
  }
}

} // namespace Qt

} // namespace CGAL

#endif // CGAL_QT_GRAPHICS_VIEW_ISO_RECTANGLE_INPUT_H