colorchooserdemo2.java

来自「这是一个英文版的《Java程序设计与问题解决》现在好多大学都当成教材」· Java 代码 · 共 92 行

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.colorchooser.*;

/* 
 * ColorChooserDemo2.java requires the following files:
 *   CrayonPanel.java
 *   images/red.gif
 *   images/yellow.gif
 *   images/green.gif
 *   images/blue.gif
 */
public class ColorChooserDemo2 extends JPanel
                               implements ActionListener,
                                          ChangeListener {
    public JLabel banner;
    public JColorChooser tcc;

    public ColorChooserDemo2() {
        //Set up banner to use as custom preview panel
        banner = new JLabel("Welcome to the Tutorial Zone!",
                            JLabel.CENTER);
        banner.setForeground(Color.yellow);
        banner.setBackground(Color.blue);
        banner.setOpaque(true);
        banner.setFont(new Font("SansSerif", Font.BOLD, 24));
        banner.setPreferredSize(new Dimension(100, 65));

        JPanel bannerPanel = new JPanel(new BorderLayout());
        bannerPanel.add(banner, BorderLayout.CENTER);
        bannerPanel.setBorder(BorderFactory.createTitledBorder("Banner"));

        //Set up color chooser for setting background color
        JPanel panel = new JPanel();
        JButton bcc = new JButton("Show Color Chooser...");
        bcc.addActionListener(this);
        panel.add(bcc);
        panel.setBorder(BorderFactory.createTitledBorder(
                                "Choose Background Color"));

        //Set up color chooser for setting text color
        tcc = new JColorChooser();
        tcc.getSelectionModel().addChangeListener(this);
        tcc.setBorder(BorderFactory.createTitledBorder("Choose Text Color"));

        //Remove the preview panel
        tcc.setPreviewPanel(new JPanel());

        //Override the chooser panels with our own
        AbstractColorChooserPanel panels[] = { new CrayonPanel() };
        tcc.setChooserPanels(panels);
        tcc.setColor(banner.getForeground());

        setLayout(new BorderLayout());
        add(bannerPanel, BorderLayout.PAGE_START);
        add(panel, BorderLayout.CENTER);
        add(tcc, BorderLayout.PAGE_END);
    }

    public void actionPerformed(ActionEvent e) {
        Color newColor = JColorChooser.showDialog(
                                       ColorChooserDemo2.this,
                                       "Choose Background Color",
                                       banner.getBackground());
        if (newColor != null) {
            banner.setBackground(newColor);
        }
    }

    public void stateChanged(ChangeEvent e) {
        Color newColor = tcc.getColor();
        banner.setForeground(newColor);
    }

    public static void main(String[] args) {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);
        JDialog.setDefaultLookAndFeelDecorated(true);

        //Create and set up the window.
        JFrame frame = new JFrame("ColorChooserDemo2");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(new ColorChooserDemo2());

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