ngmf.ui.JConsolePanel Maven / Gradle / Ivy
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*/
package ngmf.ui;
import java.awt.Font;
import java.awt.Rectangle;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JTextArea;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.text.Element;
/**
*
* @author od
*/
public class JConsolePanel extends JTextArea {
private static final long serialVersionUID = 1L;
class DefaultCommandHandler implements CommandHandler {
@Override
public String handle(String cmd) {
if (cmd.equals("clear")) {
setText("");
} else {
return "unknown command '" + cmd + "'\n";
}
return null;
}
}
static class Prompt {
public String getPrompt() {
return "> ";
}
}
static class History {
List cmds = new ArrayList();
int cursor;
public String next() {
if (cmds.size() == 0) {
return null;
}
if (cursor < cmds.size() - 1) {
cursor++;
}
return cmds.get(cursor);
}
public String prev() {
if (cmds.size() == 0) {
return null;
}
if (cursor > 0) {
cursor--;
}
return cmds.get(cursor);
}
public void appendCommand(String command) {
cmds.add(command);
cursor = cmds.size();
}
}
//
private PrintWriter w = new PrintWriter(new Writer() {
@Override
public void flush() {
}
@Override
public void close() {
}
@Override
public void write(char[] cbuf, int off, int len) throws IOException {
JConsolePanel.this.append(new String(cbuf, off, len));
setCaretPosition(getText().length());
cp = getCaretPosition();
JConsolePanel.this.scrollRectToVisible(new Rectangle(0, getHeight(), 1, 1));
}
});
//
CommandHandler cmd;
Prompt prompt;
History history;
int cp;
public JConsolePanel(Prompt p, CommandHandler cmd, History hist) {
setPromptProvider(p);
setCommandHandler(cmd);
setHistory(hist);
setText(prompt.getPrompt());
cp = prompt.getPrompt().length();
setEditable(true);
setLineWrap(true);
// setRows(3);
// setColumns(20);
addKeyListener(new KListener());
setCaretPosition(getText().length());
setFont(new Font("Monospaced", 1, 12));
addMouseListener(new MouseListener() {
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
//TODO better caret handling after selection
//TODO copy/paste ala shell
// String sel = getSelectedText();
int caretPosition = getCaretPosition();
Element el = getDocument().getDefaultRootElement();
int msel = el.getElementIndex(caretPosition) + 1;
int last = el.getElementIndex(getText().length()) + 1;
if (msel != last) {
setCaretPosition(getText().length());
}
}
});
}
public JConsolePanel() {
this(new Prompt(), null, new History());
setCommandHandler(new DefaultCommandHandler());
}
public OutputStream getOutputStream() {
return new OutputStream() {
@Override
public void write(int b) throws IOException {
JConsolePanel.this.append(Character.toString((char) b));
setCaretPosition(getText().length());
cp = getCaretPosition();
JConsolePanel.this.scrollRectToVisible(new Rectangle(0, getHeight(), 1, 1));
}
};
}
public void prompt() {
JConsolePanel.this.append(prompt.getPrompt());
setCaretPosition(getText().length());
cp = getCaretPosition();
JConsolePanel.this.scrollRectToVisible(new Rectangle(0, getHeight(), 1, 1));
}
public void clear() {
setText("");
cp = prompt.getPrompt().length();
}
//TODO cascading commandhandler (as List, processed from bottom to top)
public void setCommandHandler(CommandHandler h) {
cmd = h;
}
public void setPromptProvider(Prompt p) {
prompt = p;
}
public void setHistory(History h) {
history = h;
}
public PrintWriter getOut() {
return w;
}
private class KListener extends KeyAdapter {
@Override
public void keyPressed(KeyEvent key) {
switch (key.getKeyCode()) {
case KeyEvent.VK_C:
if (key.isControlDown()) {
key.consume();
append("\n");
append(prompt.getPrompt());
setCaretPosition(getText().length());
cp = getCaretPosition();
}
break;
case KeyEvent.VK_UP:
String prev = history.prev();
if (prev != null) {
replaceRange(prev, cp, getText().length());
}
key.consume();
break;
case KeyEvent.VK_DOWN:
String next = history.next();
if (next != null) {
replaceRange(next, cp, getText().length());
}
key.consume();
break;
case KeyEvent.VK_LEFT:
case KeyEvent.VK_BACK_SPACE:
if (cp == getCaretPosition()) {
key.consume();
}
break;
case KeyEvent.VK_ENTER:
key.consume();
String t = getText();
append("\n");
if (cmd != null) {
String c = t.substring(cp);
if (!c.isEmpty()) {
append(cmd.handle(c));
history.appendCommand(c);
}
}
append(prompt.getPrompt());
setCaretPosition(getText().length());
cp = getCaretPosition();
}
}
}
public static void main(String[] args) throws Exception {
// UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JConsolePanel cp = new JConsolePanel();
cp.getOut().println("test hetre");
cp.getOut().println("test next");
cp.prompt();
JScrollPane sp = new JScrollPane(cp);
sp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
sp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
f.getContentPane().add(sp);
f.setSize(500, 500);
f.setLocation(300, 300);
f.setVisible(true);
}
}
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