#include "Canvas.h"
#include "Editor.h"
#include "Block.h"
#include "Connection.h"
#include "Port.h"

#include <QDragEnterEvent>
#include <QWheelEvent>
#include <QTreeWidget>

// -------------------------------------------------------------------------
cpPipelineEditor::Canvas::
Canvas( QWidget* parent )
  : QGraphicsView( parent )
{
  QGraphicsScene* scene = new QGraphicsScene( this );
  this->setScene( scene );
  this->setRenderHint( QPainter::Antialiasing );
  this->setAcceptDrops( true );

  this->m_Editor = new Editor( this );
  this->m_Editor->install( scene );
}

// -------------------------------------------------------------------------
cpPipelineEditor::Canvas::
~Canvas( )
{
}

// -------------------------------------------------------------------------
cpPipelineEditor::
Editor* cpPipelineEditor::Canvas::
editor( )
{
  return( this->m_Editor );
}

// -------------------------------------------------------------------------
const cpPipelineEditor::
Editor* cpPipelineEditor::Canvas::
editor( ) const
{
  return( this->m_Editor );
}

// -------------------------------------------------------------------------
void cpPipelineEditor::Canvas::
wheelEvent( QWheelEvent* event )
{
  this->_scaleView(
    std::pow( double( 2 ), event->delta( ) / double( 240 ) )
    );
}

// -------------------------------------------------------------------------
void cpPipelineEditor::Canvas::
dragEnterEvent( QDragEnterEvent* event )
{
  const QMimeData* mime = event->mimeData( );
  if( mime->hasFormat( "application/x-qabstractitemmodeldatalist" ) )
    event->acceptProposedAction( );
}

// -------------------------------------------------------------------------
void cpPipelineEditor::Canvas::
dragLeaveEvent( QDragLeaveEvent* event )
{
}

// -------------------------------------------------------------------------
void cpPipelineEditor::Canvas::
dragMoveEvent( QDragMoveEvent* event )
{
}

// -------------------------------------------------------------------------
void cpPipelineEditor::Canvas::
dropEvent( QDropEvent* event )
{
  const QMimeData* mime = event->mimeData( );
  if( !( mime->hasFormat( "application/x-qabstractitemmodeldatalist" ) ) )
    return;

  event->acceptProposedAction( );
  auto tree = dynamic_cast< QTreeWidget* >( event->source( ) );
  if( tree == NULL )
    return;

  QList< QTreeWidgetItem* > items = tree->selectedItems( );
  for( auto iIt = items.begin( ); iIt != items.end( ); ++iIt )
    this->m_Editor->createFilter(
      ( *iIt )->text( 0 ).toStdString( ), this->mapToScene( event->pos( ) )
      );
}

// -------------------------------------------------------------------------
void cpPipelineEditor::Canvas::
_scaleView( qreal scaleFactor )
{
  qreal factor = this->transform( ).
    scale( scaleFactor, scaleFactor ).
    mapRect( QRectF( 0, 0, 1, 1 ) ).
    width( );
  if( factor < qreal( 0.07 ) || factor > qreal( 100 ) )
    return;
  this->scale( scaleFactor, scaleFactor );
}

// eof - $RCSfile$