how to bring to normal size after double click

I found below method in pdfreader class.

public boolean OnPDFDoubleTapped(float x, float y)
{
if( m_status != STA_NORMAL ) return false;
m_view.vSetScale(m_view.vGetScale() + Global.zoomStep, x, y);
return true;
}

I need to bring the pdf when if double click happens when the pdf is in mazimum size.So how to identify the maximum size ?is there any status like STA_NORMAL for maximum size ?

You can do it like:

I change the code as below.Now it maximize if i double clicks the pdf and if i double click it comes to normal size.

public boolean OnPDFDoubleTapped(float x, float y)
{

if(m_view.vGetScale() == m_view.vGetMinScale()){
m_view.vSetScale(m_view.vGetMaxScale(),x,y );
}else{
m_view.vSetScale(m_view.vGetMinScale(),x,y );
}

}