File	Doc	Category	Size	Date	Package
CLayerList.java	API Doc	phoneME MR2 API (J2ME)	3971	Wed May 02 18:00:20 BST 2007	com.sun.midp.chameleon

CLayerList

• java.lang.Object

Fields Summary
protected CLayerElement	top
protected CLayerElement	bottom
protected int	count

Constructors Summary
CLayerList() Construct empty layers list top = null; bottom = null; count = 0;

Methods Summary
CLayerElement	addLayer(CLayer layer) Add new layer to the top of list with no check for other occurrences of the layer in the list param layer CLayer instance to be added return list element of the newly added layer CLayerElement le = new CLayerElement(layer, top, null); if (top != null) top.upper = le; top = le; if (bottom == null) bottom = le; count ++; return le;
CLayerElement	find(CLayer layer) Find UI layer instance in the list param layer the instance to search in the list for return list element with searched layer if success, null otherwise for(CLayerElement l = top; l != null; l = l.lower) if (l.layer == layer) return l; return null;
CLayerElement	getBottom() Get the most bottom list element return return the element with top most layer return bottom;
CLayerElement	getTop() Get the most top list element return return the element with top most layer return top;
boolean	removeLayer(CLayer layer) Remove layer from the list param layer CLayer instance to be removed return true if the layer was found and removed, false otherwise CLayerElement le = find(layer); if (le != null) { removeLayerElement(le); le.layer = null; return true; } else { return false; }
void	removeLayerElement(CLayerElement le) Remove layer element from the list with no extra checks. It's caller's responsibility to apply the method on list elements only. param le list element to be removed CLayerElement upper = le.upper; CLayerElement lower = le.lower; if (upper != null) { upper.lower = lower; } else if (top == le) { top = lower; } if (lower != null) { lower.upper = upper; } else if (bottom == le) { bottom = upper; } // Clear links to neighbour layers le.upper = le.lower = null; count --;
int	size() Get number of layers in the list return number of list elements return count;