sampletextframe.java

< ProJavaProgrammingSecondEdition> 书中例程源码

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.text.*;

public class SampleTextFrame extends JFrame implements FontListener {

//  protected FontPropertiesPanel propertiesPanel;
  protected JPanel propertiesPanel;
  protected JTextField sampleText;
  protected JLabel displayArea;

  public static void main(String[] args) {
    SampleTextFrame stf = new SampleTextFrame();
    stf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    stf.setVisible(true);
  }

  public SampleTextFrame() {
    super();
    createComponents();
    createDocumentListener();
    buildLayout();
//    displayArea.setFont(propertiesPanel.getSelectedFont());
//    propertiesPanel.setFontListener(this);
    pack();
  }

  protected void createComponents() {
//    propertiesPanel = new FontPropertiesPanel();
    sampleText = new JTextField(20);
    displayArea = new JLabel("");
    displayArea.setPreferredSize(new Dimension(200, 75));
    displayArea.setMinimumSize(new Dimension(200, 75));
  }

  protected void createDocumentListener() {
    Document document = sampleText.getDocument();
    document.addDocumentListener(new DocumentListener() {
      public void changedUpdate(DocumentEvent event) {
        handleDocumentUpdate();
      }

      public void insertUpdate(DocumentEvent event) {
        handleDocumentUpdate();
      }

      public void removeUpdate(DocumentEvent event) {
        handleDocumentUpdate();
      }
    }
    );
  }

  protected void buildLayout() {
    Container pane = getContentPane();
    GridBagConstraints gbc = new GridBagConstraints();
    GridBagLayout gbl = new GridBagLayout();
    pane.setLayout(gbl);

    gbc.insets = new Insets(5, 10, 5, 10);
    gbc.fill = GridBagConstraints.HORIZONTAL;
    gbc.weightx = 1;

    gbc.gridx = 0;
    BevelBorder bb = new BevelBorder(BevelBorder.RAISED);
    TitledBorder tb = new TitledBorder(bb, "Font");
    propertiesPanel.setBorder(tb);
    gbl.setConstraints(propertiesPanel, gbc);
    pane.add(propertiesPanel);

    gbl.setConstraints(sampleText, gbc);
    pane.add(sampleText);

    gbl.setConstraints(displayArea, gbc);
    pane.add(displayArea);
  }

  protected void handleDocumentUpdate() {
    displayArea.setText(sampleText.getText());
  }

//  public void refreshDisplayFont() {
//    displayArea.setFont(getSelectedFont());
//  }

//  public Font getSelectedFont() {
//    String name = propertiesPanel.getSelectedFontName();
//    int style = 0;
//    style += (propertiesPanel.isBoldSelected() ? Font.BOLD : 0);
//    style += (propertiesPanel.isItalicSelected() ? Font.ITALIC : 0);
//    int size = propertiesPanel.getSelectedFontSize();
//    return new Font(name, style, size);
//  }

  public void fontChanged(Font newFont) {
    displayArea.setFont(newFont);
  }

}