question: public void mousePressed ( MouseEvent e ) { if ( log . isDebugEnabled ( ) ) { log . debug ( "pressed " + ( e . getModifiers ( ) & MouseEvent . BUTTON1_MASK ) + " " + e . isPopupTrigger ( ) + " " + ( e . getModifiers ( ) & ( MouseEvent . ALT_MASK + MouseEvent . META_MASK + MouseEvent . CTRL_MASK ) ) + ( " " + MouseEvent . ALT_MASK + "/" + MouseEvent . META_MASK + "/" + MouseEvent . CTRL_MASK ) ) ; } JToggleButton button = ( JToggleButton ) e . getSource ( ) ; if ( e . isPopupTrigger ( ) ) { popup . show ( e . getComponent ( ) , e . getX ( ) , e . getY ( ) ) ; } else if ( button . isEnabled ( ) && ( ( e . getModifiers ( ) & MouseEvent . BUTTON1_MASK ) != 0 ) && ( ( e . getModifiers ( ) & ( MouseEvent . ALT_MASK + MouseEvent . META_MASK + MouseEvent . CTRL_MASK ) ) == 0 ) && ! isLockable ) { changeState ( true ) ; } button . setSelected ( isOn ) ; }
target:  If the event is the popup trigger, which is dependent on the platform, present the popup menu. Otherwise change the state of the function depending on the locking state of the button.