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//=============================================================================
//
//                               OpenFlipper
//        Copyright (C) 2009 by Computer Graphics Group, RWTH Aachen
//                           www.openflipper.org
//
//-----------------------------------------------------------------------------
//
//                                License
//
//  OpenFlipper is free software: you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  OpenFlipper is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public License
//  along with OpenFlipper.  If not, see <http://www.gnu.org/licenses/>.
//
//-----------------------------------------------------------------------------
//
//   $Revision: $
//   $Author: $
//   $Date: $
//
//=============================================================================

//== INCLUDES =================================================================
#include <math.h>

#include <QPolygonF>
#include <QGraphicsItem>
#include <QFontMetrics>
#include <QPen>
#include <QPainter>
#include <QPainterPath>
#include <QGraphicsSceneMouseEvent>

#include "button.hh"

#define BACK_OFFSET 2

//== NAMESPACES ===============================================================
namespace VSI {

//=============================================================================
//
//  CLASS VSI::Button - IMPLEMENTATION
//
//=============================================================================

/// Constructor
Button::Button (QGraphicsItem *_parent) :
  Text (_parent),
  glow_ (false)
{
  setBackground (true, true);
  setAcceptHoverEvents (true);
}

//------------------------------------------------------------------------------

/// Constructor
Button::Button (const QString &_text, QGraphicsItem *_parent) :
  Text (_text, _parent),
  glow_ (false)
{
  setBackground (true, true);
  setAcceptHoverEvents (true);
}

//------------------------------------------------------------------------------

/// Destructor
Button::~Button ()
{
}

//------------------------------------------------------------------------------

// glow on mouse enter
void Button::hoverEnterEvent (QGraphicsSceneHoverEvent *_event)
{
  glow_ = true;
  update ();

  QPen pen = backgroundPen_;
  pen.setWidthF (1.0);
  pen.setColor (QColor (127, 166, 218));
  Text::setBackgroundPen (pen);
}

//------------------------------------------------------------------------------

// stop glowing on mouse leave
void Button::hoverLeaveEvent (QGraphicsSceneHoverEvent *_event)
{
  glow_ = false;
  update ();

  Text::setBackgroundPen (backgroundPen_);
}

//------------------------------------------------------------------------------

// emit pressed () on mouse press
void Button::mousePressEvent (QGraphicsSceneMouseEvent *_event)
{
  QBrush brush = backgroundBrush_;
  
  brush.setColor (brush.color ().lighter (50));
  Text::setBackgroundBrush (brush);
  emit pressed ();
  _event->accept ();
}

//------------------------------------------------------------------------------

// change brush back to normal
void Button::mouseReleaseEvent (QGraphicsSceneMouseEvent *_event)
{
  Text::setBackgroundBrush (backgroundBrush_);
  _event->accept ();
}

//------------------------------------------------------------------------------

/// Sets the background brush
void Button::setBackgroundBrush(QBrush _brush)
{
  backgroundBrush_ = _brush;
  Text::setBackgroundBrush (_brush);
}

//------------------------------------------------------------------------------

/// Sets the background pen
void Button::setBackgroundPen(QPen _pen)
{
  backgroundPen_ = _pen;
  Text::setBackgroundPen (_pen);
}

//------------------------------------------------------------------------------

/// Button glow painting
void Button::paint (QPainter *_painter, const QStyleOptionGraphicsItem *_option, QWidget *_widget)
{
  if (glow_)
  {
    QPainterPath path = shape ();
    QPen curr = _painter->pen ();

    QPen pen = backgroundPen_;
    pen.setCapStyle(Qt::RoundCap);
    pen.setJoinStyle(Qt::RoundJoin);

    pen.setColor (QColor (127, 166, 218, 64));
    pen.setWidthF (7.0);
    _painter->setPen (pen);
    _painter->drawPath (path);
    pen.setColor (QColor (127, 166, 218, 128));
    pen.setWidthF (5.0);
    _painter->setPen (pen);
    _painter->drawPath (path);
    pen.setColor (QColor (127, 166, 218, 192));
    pen.setWidthF (3.0);
    _painter->setPen (pen);
    _painter->drawPath (path);

    _painter->setPen (curr);
  }
  Text::paint (_painter, _option, _widget);
}

//------------------------------------------------------------------------------

/// Bounding rectangle
QRectF Button::boundingRect() const
{
  QRectF rect = Text::boundingRect ();

  if (rect.width () && rect.height ())
    rect.adjust(-3, -3, 3, 3);

  return rect;
}

//------------------------------------------------------------------------------

/// Sets the geometry
void Button::setGeometry(const QRectF & _rect)
{
  Text::setGeometry (_rect);
}

//------------------------------------------------------------------------------
}