package components;

import javax.swing.*;
import javax.swing.text.*;

import java.awt.*;        //for layout managers and more
import java.awt.event.*;    //for action events

import java.net.URL;
import java.io.IOException;

public class TextSamplerDemo extends JPanel
               implements ActionListener {
  private String newline = "\n";
  protected static final String textFieldString = "JTextField";
  protected static final String passwordFieldString = "JPasswordField";

  protected JLabel actionLabel;

  public TextSamplerDemo() {
    setLayout(new BorderLayout());

    //Create a regular text field.
    JTextField textField = new JTextField(10);
    textField.setActionCommand(textFieldString);
    textField.addActionListener(this);

    //Create a password field.
    JPasswordField passwordField = new JPasswordField(10);
    passwordField.setActionCommand(passwordFieldString);
    passwordField.addActionListener(this);    

    //Create some labels for the fields.
    JLabel textFieldLabel = new JLabel(textFieldString + ": ");
    textFieldLabel.setLabelFor(textField);
    JLabel passwordFieldLabel = new JLabel(passwordFieldString + ": ");
    passwordFieldLabel.setLabelFor(passwordField);

    //Create a label to put messages during an action event.
    actionLabel = new JLabel("Type text in a field and press Enter.");
    actionLabel.setBorder(BorderFactory.createEmptyBorder(10,0,0,0));

    //Lay out the text controls and the labels.
    JPanel textControlsPane = new JPanel();
    GridBagLayout gridbag = new GridBagLayout();
    GridBagConstraints c = new GridBagConstraints();

    textControlsPane.setLayout(gridbag);

    JLabel[] labels = {textFieldLabel, passwordFieldLabel };
    JTextField[] textFields = {textField, passwordField };
    addLabelTextRows(labels, textFields, gridbag, textControlsPane);

    c.gridwidth = GridBagConstraints.REMAINDER; //last
    c.anchor = GridBagConstraints.WEST;
    c.weightx = 1.0;
    textControlsPane.add(actionLabel, c);
    textControlsPane.setBorder(
        BorderFactory.createCompoundBorder(
                BorderFactory.createTitledBorder("Text Fields"),
                BorderFactory.createEmptyBorder(5,5,5,5)));

    //Create a text area.
    JTextArea textArea = new JTextArea(
        "This is an editable JTextArea. " +
        "A text area is a \"plain\" text component, " +
        "which means that although it can display text " +
        "in any font, all of the text is in the same font."
    );
    textArea.setFont(new Font("Serif", Font.ITALIC, 16));
    textArea.setLineWrap(true);
    textArea.setWrapStyleWord(true);
    JScrollPane areaScrollPane = new JScrollPane(textArea);
    areaScrollPane.setVerticalScrollBarPolicy(
            JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
    areaScrollPane.setPreferredSize(new Dimension(250, 250));
    areaScrollPane.setBorder(
      BorderFactory.createCompoundBorder(
        BorderFactory.createCompoundBorder(
                BorderFactory.createTitledBorder("Plain Text"),
                BorderFactory.createEmptyBorder(5,5,5,5)),
        areaScrollPane.getBorder()));

    //Put everything together.
    JPanel leftPane = new JPanel(new BorderLayout());
    leftPane.add(textControlsPane, 
           BorderLayout.PAGE_START);
    leftPane.add(areaScrollPane,
           BorderLayout.CENTER);

    add(leftPane, BorderLayout.LINE_START);
  }

  private void addLabelTextRows(JLabel[] labels,
                  JTextField[] textFields,
                  GridBagLayout gridbag,
                  Container container) {
    GridBagConstraints c = new GridBagConstraints();
    c.anchor = GridBagConstraints.EAST;
    int numLabels = labels.length;

    for (int i = 0; i < numLabels; i++) {
      c.gridwidth = GridBagConstraints.RELATIVE; //next-to-last
      c.fill = GridBagConstraints.NONE;    //reset to default
      c.weightx = 0.0;             //reset to default
      container.add(labels[i], c);

      c.gridwidth = GridBagConstraints.REMAINDER;   //end row
      c.fill = GridBagConstraints.HORIZONTAL;
      c.weightx = 1.0;
      container.add(textFields[i], c);
    }
  }

  public void actionPerformed(ActionEvent e) {
    String prefix = "You typed \"";
    if (textFieldString.equals(e.getActionCommand())) {
      JTextField source = (JTextField)e.getSource();
      actionLabel.setText(prefix + source.getText() + "\"");
    } else if (passwordFieldString.equals(e.getActionCommand())) {
      JPasswordField source = (JPasswordField)e.getSource();
      actionLabel.setText(prefix + new String(source.getPassword())
                + "\"");
    }
  }

  /**
   * Create the GUI and show it.  For thread safety,
   * this method should be invoked from the
   * event dispatch thread.
   */
  private static void createAndShowGUI() {
    //Create and set up the window.
    JFrame frame = new JFrame("TextSamplerDemo");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    //Add content to the window.
    frame.add(new TextSamplerDemo());

    //Display the window.
    frame.pack();
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    //Schedule a job for the event dispatching thread:
    //creating and showing this application's GUI.
    SwingUtilities.invokeLater(new Runnable() {
      public void run() {
         //Turn off metal's use of bold fonts
		UIManager.put("swing.boldMetal", Boolean.FALSE);
		createAndShowGUI();
      }
    });
  }
}