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/*===========================================================================*\
*                                                                            *
*                              OpenFlipper                                   *
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 *           Copyright (c) 2001-2015, RWTH-Aachen University                 *
 *           Department of Computer Graphics and Multimedia                  *
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 *                            www.openflipper.org                            *
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 * This file is part of OpenFlipper.                                         *
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 *    this list of conditions and the following disclaimer.                  *
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\*===========================================================================*/

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//== INCLUDES =================================================================
#include <QVBoxLayout>
#include <QLabel>
#include <QPainter>
#include <QMimeData>
#include <QDrag>
#include <QMouseEvent>

#include "toolBoxElement.hh"
#include "parser/element.hh"

#define BACKGROUND_RED   0x00
#define BACKGROUND_GREEN 0x00
#define BACKGROUND_BLUE  0x00
#define BACKGROUND_ALPHA 0xff

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

//=============================================================================
//
//  CLASS ToolBoxElement - IMPLEMENTATION
//
//=============================================================================

/// Constructor
ToolBoxElement::ToolBoxElement (Element *_element, QWidget *_parent) :
  QWidget (_parent),
  element_ (_element)
{
  QVBoxLayout *layout = new QVBoxLayout ();

  layout->setContentsMargins (2, 2, 2, 2);

  QLabel *label = new QLabel (element_->shortDescription (), this);

  label->setAlignment (Qt::AlignHCenter);
  label->setWordWrap (true);

  QPalette p = label->palette ();
  p.setBrush (QPalette::WindowText, Qt::white);
  p.setBrush (QPalette::ButtonText, Qt::white);
  label->setPalette (p);
  
  layout->addWidget (label);

  setToolTip (element_->longDescription ());

  setLayout (layout);
}

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

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

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

// Paint a rounded rect as background
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void ToolBoxElement::paintEvent(QPaintEvent * /*_event*/)
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{
  QPainter p (this);
  p.setRenderHint(QPainter::Antialiasing);

  p.setBrush(QBrush(QColor(BACKGROUND_RED,
                                   BACKGROUND_GREEN,
                                   BACKGROUND_BLUE,
                                   BACKGROUND_ALPHA)));
  p.setPen(QColor(BACKGROUND_RED + 0x30,
                          BACKGROUND_GREEN + 0x30,
                          BACKGROUND_BLUE + 0x30,
                          BACKGROUND_ALPHA));
  p.drawRoundedRect(0, 0, width (), height (), 4, 4);

}

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

/// Starts drag on mouse press
void ToolBoxElement::mousePressEvent(QMouseEvent *_event)
{
  QMimeData *mimeData = new QMimeData;

  QPoint off = _event->pos() - QPoint (width () / 2, height () / 2);

  QString data = QString::number (off.x ()) + ";";
  data += QString::number (off.y ()) + ";" + element_->name ();

  // internal mimetype
  mimeData->setData ("application/x-openflipper.vsi",data.toLocal8Bit ());

  QDrag *drag = new QDrag(this);
  drag->setMimeData(mimeData);

  QPixmap pixmap (size ());
  pixmap.fill(Qt::transparent);

  render (&pixmap);

  drag->setPixmap(pixmap);
  drag->setHotSpot(_event->pos());

  drag->exec ();
}

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