function _fnSetFocus()

in uima-ducc-web/src/main/webapp/root/opensources/DataTables-1.10.1/extensions/KeyTable/js/dataTables.keyTable.js [419:580]
118 lines of code
28 McCabe index (conditional complexity)

	function _fnSetFocus( nTarget, bAutoScroll )
	{
		/* If node already has focus, just ignore this call */
		if ( _nOldFocus == nTarget )
		{
			return;
		}

		if ( typeof bAutoScroll == 'undefined' )
		{
			bAutoScroll = true;
		}

		/* Remove old focus (with blur event if needed) */
		if ( _nOldFocus !== null )
		{
			_fnRemoveFocus( _nOldFocus );
		}

		/* Add the new class to highlight the focused cell */
		$(nTarget).addClass( _sFocusClass );
		$(nTarget).parent().addClass( _sFocusClass );

		/* If it's a DataTable then we need to jump the paging to the relevant page */
		var oSettings;
		if ( _oDatatable )
		{
			oSettings = _oDatatable;
			var iRow = _fnFindDtCell( nTarget )[1];
			var bKeyCaptureCache = _bKeyCapture;

			/* Page forwards */
			while ( iRow >= oSettings.fnDisplayEnd() )
			{
				if ( oSettings._iDisplayLength >= 0 )
				{
					/* Make sure we are not over running the display array */
					if ( oSettings._iDisplayStart + oSettings._iDisplayLength < oSettings.fnRecordsDisplay() )
					{
						oSettings._iDisplayStart += oSettings._iDisplayLength;
					}
				}
				else
				{
					oSettings._iDisplayStart = 0;
				}
				_oDatatable.oApi._fnCalculateEnd( oSettings );
			}

			/* Page backwards */
			while ( iRow < oSettings._iDisplayStart )
			{
				oSettings._iDisplayStart = oSettings._iDisplayLength>=0 ?
					oSettings._iDisplayStart - oSettings._iDisplayLength :
					0;

				if ( oSettings._iDisplayStart < 0 )
				{
				  oSettings._iDisplayStart = 0;
				}
				_oDatatable.oApi._fnCalculateEnd( oSettings );
			}

			/* Re-draw the table */
			_oDatatable.oApi._fnDraw( oSettings );

			/* Restore the key capture */
			_bKeyCapture = bKeyCaptureCache;
		}

		/* Cache the information that we are interested in */
		var aNewPos = _fnCoordsFromCell( nTarget );
		_nOldFocus = nTarget;
		_iOldX = aNewPos[0];
		_iOldY = aNewPos[1];

		var iViewportHeight, iViewportWidth, iScrollTop, iScrollLeft, iHeight, iWidth, aiPos;
		if ( bAutoScroll )
		{
			/* Scroll the viewport such that the new cell is fully visible in the rendered window */
			iViewportHeight = $(window).height();
			iViewportWidth = $(window).width();
			iScrollTop = $(document).scrollTop();
			iScrollLeft = $(document).scrollLeft();
			iHeight = nTarget.offsetHeight;
			iWidth = nTarget.offsetWidth;
			aiPos = _fnGetPos( nTarget );

			/* Take account of scrolling in DataTables 1.7 - remove scrolling since that would add to
			 * the positioning calculation
			 */
			if ( _oDatatable && typeof oSettings.oScroll != 'undefined' &&
			  (oSettings.oScroll.sX !== "" || oSettings.oScroll.sY !== "") )
			{
				aiPos[1] -= $(oSettings.nTable.parentNode).scrollTop();
				aiPos[0] -= $(oSettings.nTable.parentNode).scrollLeft();
			}

			/* Correct viewport positioning for vertical scrolling */
			if ( aiPos[1]+iHeight > iScrollTop+iViewportHeight )
			{
				/* Displayed element if off the bottom of the viewport */
				_fnSetScrollTop( aiPos[1]+iHeight - iViewportHeight );
			}
			else if ( aiPos[1] < iScrollTop )
			{
				/* Displayed element if off the top of the viewport */
				_fnSetScrollTop( aiPos[1] );
			}

			/* Correct viewport positioning for horizontal scrolling */
			if ( aiPos[0]+iWidth > iScrollLeft+iViewportWidth )
			{
				/* Displayed element is off the bottom of the viewport */
				_fnSetScrollLeft( aiPos[0]+iWidth - iViewportWidth );
			}
			else if ( aiPos[0] < iScrollLeft )
			{
				/* Displayed element if off the Left of the viewport */
				_fnSetScrollLeft( aiPos[0] );
			}
		}

		/* Take account of scrolling in DataTables 1.7 */
		if ( _oDatatable && typeof oSettings.oScroll != 'undefined' &&
		  (oSettings.oScroll.sX !== "" || oSettings.oScroll.sY !== "") )
		{
			var dtScrollBody = oSettings.nTable.parentNode;
			iViewportHeight = dtScrollBody.clientHeight;
			iViewportWidth = dtScrollBody.clientWidth;
			iScrollTop = dtScrollBody.scrollTop;
			iScrollLeft = dtScrollBody.scrollLeft;
			iHeight = nTarget.offsetHeight;
			iWidth = nTarget.offsetWidth;

			/* Correct for vertical scrolling */
			if ( nTarget.offsetTop + iHeight > iViewportHeight+iScrollTop )
			{
				dtScrollBody.scrollTop = (nTarget.offsetTop + iHeight) - iViewportHeight;
			}
			else if ( nTarget.offsetTop < iScrollTop )
			{
				dtScrollBody.scrollTop = nTarget.offsetTop;
			}

			/* Correct for horizontal scrolling */
			if ( nTarget.offsetLeft + iWidth > iViewportWidth+iScrollLeft )
			{
				dtScrollBody.scrollLeft = (nTarget.offsetLeft + iWidth) - iViewportWidth;
			}
			else if ( nTarget.offsetLeft < iScrollLeft )
			{
				dtScrollBody.scrollLeft = nTarget.offsetLeft;
			}
		}

		/* Focused - so we want to capture the keys */
		_fnCaptureKeys();

		/* Fire of the focus event if there is one */
		_fnEventFire( "focus", _iOldX, _iOldY );
	}