VisClient/org/hfbk/util/ShellPanel.java

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package org.hfbk.util;

import java.awt.BorderLayout;
import java.awt.Panel;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;

public abstract class ShellPanel extends Panel {
        
        TextArea output;
        public ShellPanel() {
                setLayout(new BorderLayout());
                
                output=new TextArea(20,50);
                output.setEditable(false);
                add(output, BorderLayout.CENTER);
                
                final TextField input=new TextField();
                input.addActionListener(new ActionListener(){
                        public void actionPerformed(ActionEvent e) {
                                String command=input.getText();
                                input.setText("");
                                output.append("\n> "+command);
                                String result=action(command);
                                output.append("\n"+result);
                        }
                });
                input.addKeyListener(new KeyAdapter(){
                        public void keyReleased(KeyEvent e) {
                                String history="\n"+output.getText();
                                String current=input.getText();
                                int i=history.lastIndexOf("> "+current+"\n");
                                if (i==-1) i=history.length()+1;
                        
                                int j=-1;
                                switch(e.getKeyCode()){
                                case KeyEvent.VK_UP: 
                                        j=history.lastIndexOf("\n> ", i-3);                                             
                                break;
                                case KeyEvent.VK_DOWN:
                                        j=history.indexOf("\n> ", i);
                                break;
                                }
                                if (j>-1){
                                        j+=3; //skip "\n> "
                                        int k=history.indexOf('\n',j);
                                        current=history.substring(j, k);
                                        input.setText(current);
                                        input.setCaretPosition(Integer.MAX_VALUE);
                                }                       
                        }
                });             
                add(input, BorderLayout.SOUTH);
        }
        
        abstract public String action(String command);
        
        public void println(Object o){
                String result="";
                if (o instanceof Object[])
                        for (Object p :  ((Object[])o))
                                result+=p+"\n";
                else if (o!=null)
                        result=o.toString();
                
                output.append("\n"+result);
        }
        
}

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