Let's
start with the ubiques Hello World exampleFirst we need a HelloTrivialWorld
bean. It has a HelloWorld label and a add button. The add button is ment to create another HelloTrivialWorld bean.
(The number of worlds are reflected with a static counter.)
Remark: This class is just a regular bean. It has no JBFrame code what so ever!
public class HelloTrivialWorldBean extends JPanel
{
public JButton addBt = new JButton("create a new world");
private static int counter;
public HelloTrivialWorldBean()
{
super(new BorderLayout(0,0));
JLabel helloWorldLb = new JLabel("Hello World Nr. " + counter);
counter ++;
helloWorldLb.setFont(new Font("Helvetica", Font.BOLD, 24));
helloWorldLb.setHorizontalAlignment(JLabel.CENTER);
add(helloWorldLb, BorderLayout.CENTER);
add(addBt, BorderLayout.SOUTH);
}
public JButton getAddButton()
{
return addBt;
}
}
The following screen shows this bean in a regular JFrame:
Now the next step will
be, that we implement an adapter which will add this bean to the JBFrame and whenever the "create a new word"
button is pressed, a sub-node with another HelloTrivialWorld bean is added and displayed.
public class HelloTrivialWorldBeanAdapter
extends JBDefaultAdapter
implements ActionListener
{
// static counter
private static int counter;
private JBFrame jbframe;
// the private instance of the bean in this adapter
private HelloTrivialWorldBean helloTrivialWorldBean;
public HelloTrivialWorldBeanAdapter(JBAdapter parent)
{
helloTrivialWorldBean = new HelloTrivialWorldBean();
jbframe = JBDefaultFrame.getInstance();
// setting the protected fields from the JBDefaultAdapter
// the label which is displayed in the tree
setLabel("HTW: " + counter);
counter ++;
// the display component is the bean itself
setDisplayComponent(helloTrivialWorldBean);
// this class is listening the bean add button for adding another
// adapter
helloTrivialWorldBean.getAddButton().addActionListener(this);
setParent(parent);
}
public void actionPerformed(ActionEvent ae)
{
if (ae.getSource() == helloTrivialWorldBean.getAddButton())
{
// creating another adapter
HelloTrivialWorldBeanAdapter next = new HelloTrivialWorldBeanAdapter(this);
// adding it to the frame (jbframe == a protected field of the JBDefaultAdapter
jbframe.addNode(next);
// show the node
jbframe.gotoNode(next);
}
}
public static void main(String a[])
{
// Setting the default nice icons of JBDefaultFrame
JBDefaultFrame.initTreeIcons();
// creating the JFrame (the JBFrame is only a lightweight component !)
JFrame fr = new JFrame("HelloTrivialWorldBean");
// get an instance of the JBFame
JBDefaultFrame jbframe = JBDefaultFrame.getInstance();
// create an initial adapter and add it to the JBFrame
HelloTrivialWorldBeanAdapter htwa = new HelloTrivialWorldBeanAdapter(null);
jbframe.addNode(htwa);
// setting a default toolbar
JToolBar defaultToolbar = new JToolBar();
(defaultToolbar.add(jbframe.new ExitAction())).setToolTipText("Exit Hello Trivial World");
jbframe.setToolbar(defaultToolbar);
// setting the JBFrame menu bar into the JFrame
fr.setJMenuBar(jbframe.getMenuBar());
// go to the initial node
jbframe.gotoNode(htwa);
// adding the jbframe component to the JFrame
fr.getContentPane().add(jbframe);
fr.setSize(new Dimension(500,300));
fr.setVisible(true);
}