IRenderWidget::IRenderWidget( QWidget* Parent ) :
QWidget( Parent ),
m_Initialized( false ),
m_RenderWindow( NULL )
{
  // Initialize the widget.
  setMinimumSize( 320, 240 );
  setAttribute( Qt::WA_PaintOnScreen );
  setAttribute( Qt::WA_OpaquePaintEvent );
  setAttribute( Qt::WA_NoSystemBackground );
  setFocusPolicy( Qt::StrongFocus );
  setMouseTracking( true );

  // Set the timer interval.
  m_Timer.setInterval( (1.0f / 60.0f) * 1000.0f );
}

IRenderWidget::~IRenderWidget()
{
  DE_SAFE_DELETE( m_RenderWindow );
}

QPaintEngine* IRenderWidget::paintEngine() const
{
  return NULL;
}

void IRenderWidget::resizeEvent( QResizeEvent* event )
{
  if( m_RenderWindow )
  {
    const QSize& Size = event->size();
    m_RenderWindow->ResizeBuffers( Size.width(), Size.height() );
  }
}

void IRenderWidget::paintEvent( QPaintEvent* event )
{
  if( m_Initialized )
  {
    // Set the current render window.
    DE::CEngine::GetRenderer().SetRenderWindow( m_RenderWindow );

    // Update the render window widget.
    OnUpdate();

    // End of the rendering.
    DE::CEngine::GetRenderer().EndOfRendering();
  }
}

void IRenderWidget::showEvent( QShowEvent* event )
{
  if( m_Initialized == false )
  {
    // Create the render window from renderer.
    m_RenderWindow = DE::CEngine::GetRenderer().CreateRenderWindow();

    // Create the render window from handle.
    m_RenderWindow->Create( (void*)winId(), false );

    // Initialize the render window widget.
    OnInit();

    // Connect the timer.
    connect( &m_Timer, SIGNAL( timeout() ), this, SLOT( repaint() ) );

    // Start the timer.
    m_Timer.start();

    // Set the initialized flag.
    m_Initialized = true;
  }
}