Alert.java

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package org.libcsdbg.jtracer;

import java.awt.event.KeyEvent;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.Font;
import java.awt.Color;
import java.awt.Insets;
import java.awt.BorderLayout;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;

import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.ImageIcon;
import javax.swing.WindowConstants;

public class Alert extends JDialog implements ActionListener
{
  private static final long serialVersionUID = 0x00;

  public static final short QUESTION_MSG = 0x01;

  public static final short ERROR_MSG = 0x02;

  public static final short INFORMATION_MSG = 0x03;

  private boolean reply = false;


  Alert(JFrame owner, String msg, short desc)
  {
    super(owner, true);

    Button ok = new Button("Ok", this);
    ok.setMnemonic(KeyEvent.VK_O);

    Button cancel = new Button("Cancel", this);
    cancel.setMnemonic(KeyEvent.VK_C);

    GridBagLayout lm = new GridBagLayout();
    JPanel center = new JPanel(lm);
    JPanel south = new JPanel(lm);
    ImageIcon icon = null;

    Registry conf = Registry.getCurrent();
    GridBagConstraints c = new GridBagConstraints();
    c.gridy = c.gridx = 0;
    c.insets = new Insets(12, 4, 4, 4);

    /* Based on the type, set alert title, buttons and icon */
    switch (desc) {
      case QUESTION_MSG:
        setTitle("Question");
        icon = conf.loadIcon("prompt32.png");

        lm.setConstraints(ok, c);
        south.add(ok);

        c.gridx++;
        lm.setConstraints(cancel, c);
        south.add(cancel);
        break;

      case ERROR_MSG:
        setTitle("Error");
        icon = conf.loadIcon("error32.png");
        lm.setConstraints(ok, c);
        south.add(ok);
        break;

      case INFORMATION_MSG:
        setTitle("Information");
        icon = conf.loadIcon("info32.png");
        lm.setConstraints(ok, c);
        south.add(ok);
    }

    /* Break up the message into lines */
    String lines[] = msg.split("\\n");

    JLabel l = new JLabel(icon);
    c.gridx = 0;
    c.insets = new Insets(12, 12, 0, 12);
    c.anchor = GridBagConstraints.NORTH;
    c.gridheight = lines.length;
    lm.setConstraints(l, c);
    center.add(l);

    c.gridx = c.gridheight = 1;
    c.insets = new Insets(8, 0, 0, 8);
    c.anchor = GridBagConstraints.WEST;

    Font fnt = (Font) conf.get("message", "font");
    Color fg = (Color) conf.get("message", "fgcolor");
    for (int i = 0, cnt = lines.length; i < cnt; i++) {
      l = new JLabel(lines[i]);
      l.setFont(fnt);
      l.setForeground(fg);

      c.gridy = i;
      lm.setConstraints(l, c);
      center.add(l);
      c.insets.top = 4;
    }

    add(center, BorderLayout.CENTER);
    add(south, BorderLayout.SOUTH);

    setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
    setResizable(false);
    pack();
    setLocationRelativeTo(owner);

    getToolkit().beep();
    setVisible(true);
  }


  public boolean getReply()
  {
    return reply;
  }


  public static void error(JFrame owner, String msg, boolean fatal)
  {
    new Alert(owner, msg, ERROR_MSG);
    if (fatal)
      System.exit(1);
  }


  public static void info(JFrame owner, String msg)
  {
    new Alert(owner, msg, INFORMATION_MSG);
  }


  public static boolean prompt(JFrame owner, String msg)
  {
    Alert prompt = new Alert(owner, msg, QUESTION_MSG);
    return prompt.reply;
  }


  public void actionPerformed(ActionEvent event)
  {
    try {
      String cmd = event.getActionCommand();
      if (cmd.equals("Ok"))
        reply = true;

      dispose();
    }

    catch (Throwable t) {
      Registry.debug(t);
    }
  }
}