Class brsVisitor.BRSDisplayAdapter

public class BRSDisplayAdapter
extends Object
This class acts as an MVC view adapter for a BiTree to display the tree on a JComponent. The JComponent is assumed to have a null layout. The display process clears the JComponent of all other components and then lays out JLabels on it where each label's text is the String representation of a node's data. Note: If a JScrollPane is used to hold the JComponent, it must be validated after running showTree() method.

Variable Index

o colOffset
The offset from the left in pixels of the entire display
o container
The JComponent upon which the BiTree is to be shown
o displayVisitor
An anonymous inner class IBRSAlgo that is used to traverse the BiTree, calling the showData() method at every non-null node
o getMaxDepthVisitor
o labelHeight
The height of the label to make
o labelWidth
The width of the label to make
o maxDepth
The maximum depth, in rows, of the tree to be displayed
o rowOffset
The offset from the top in pixels of the entire display

Constructor Index

o BRSDisplayAdapter (JComponent, int, int)
Constructor for the class that defaults the label width x height to 100 x 30
o BRSDisplayAdapter (JComponent, int, int, int, int)
Constructor for the class that also allows the label width and height to be specified

Method Index

o displayTree (BiTree)
Displays a BiTree on a JComponent by clearing the JComponent of all other components and then laying out a JLabel for every non-null node of the tree
o getBounds (RowColIdx)
Calculates the bounds of the label for a node, given its row and column index
o showData (Object, RowColIdx)
Creates a JLabel whose text is the String representation of the supplied data

Variables

o rowOffset 
private int rowOffset = 0
The offset from the top in pixels of the entire display.

o colOffset 
private int colOffset = 0
The offset from the left in pixels of the entire display.

o labelWidth 
private int labelWidth = 100
The width of the label to make.

o labelHeight 
private int labelHeight = 30
The height of the label to make.

o maxDepth 
private int maxDepth = 0
The maximum depth, in rows, of the tree to be displayed. This quantitiy is calculated each time the tree is displayed.

o container 
private JComponent container
The JComponent upon which the BiTree is to be shown.

o displayVisitor 
private IVisitor displayVisitor = new IVisitor() {

            public Object emptyCase(BiTree host, Object param)
            {
              return (null);
            }

            public final Object nonEmptyCase(BiTree host, Object param)
            {
              showData( host.getRootDat(), (RowColIdx) param);
              host.getLeftSubTree().execute(this, ((RowColIdx) param).nextLeft());
              host.getRightSubTree().execute(this,((RowColIdx) param).nextRight());
              return(null);
            }

        }
An anonymous inner class IBRSAlgo that is used to traverse the BiTree, calling the showData() method at every non-null node.

o getMaxDepthVisitor 
private BRSGetMaxDepthVisitor getMaxDepthVisitor = new BRSGetMaxDepthVisitor()

Constructors

o BRSDisplayAdapter 
private  BRSDisplayAdapter(JComponent container, int rowOffset, int colOffset)
Constructor for the class that defaults the label width x height to 100 x 30

Parameters:
container - The JComponent to display the BiTree on.
rowOffset - The vertical offset of the display in pixels.
colOffset - The horizontal offset of the display in pixels.
o BRSDisplayAdapter 
public  BRSDisplayAdapter(JComponent container, int rowOffset, int colOffset, int labelWidth, int labelHeight)
Constructor for the class that also allows the label width and height to be specified..

Parameters:
container - The JComponent to display the BiTree on.
rowOffset - The vertical offset of the display in pixels.
colOffset - The horizontal offset of the display in pixels.
labelWidth - The width of the labels
labelHeight - The hieght of the labels.

Methods

o getBounds 
private Rectangle getBounds(RowColIdx rowColIdx)
Calculates the bounds of the label for a node, given its row and column index.

Parameters:
rowColIdx - The row and column index of the node.
Returns:
A bounds Rectangle object.
o showData 
private void showData(Object data, RowColIdx rowColIdx)
Creates a JLabel whose text is the String representation of the supplied data. The bounds of the label are calculated from the supplied RowColIdx.

Parameters:
data - The data to be displayed.
rowColIdx - The row and column index of the data's node.
o displayTree 
public void displayTree(BiTree tree)
Displays a BiTree on a JComponent by clearing the JComponent of all other components and then laying out a JLabel for every non-null node of the tree.

Parameters:
tree -