《Java 核心技术 卷1》 笔记 第九章 Swing 用户界面组件(16) 颜色选择器

9.7.5 颜色选择器

作用：可通过调色板选择颜色

显示：

Color selectedColor = JColorChooser.showDialog(parent, title, initialColor);

import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Main {
public static void main(String[] args) {
Main solution = new Main();

EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
ColorChooserFrame ColorChooserFrame = new ColorChooserFrame();
ColorChooserFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
ColorChooserFrame.setVisible(true);
}
});
}

}

class ColorChooserFrame extends JFrame {
public static final int W = 600;
public static final int H = 400;


public ColorChooserFrame(){
setTitle("ColorChooserTest");
setSize(W,H);

ColorChooserPanel panel = new ColorChooserPanel();
add(panel);
}

class ColorChooserPanel extends JPanel{

public ColorChooserPanel(){
JButton modalButton = new JButton("Modal");
modalButton.addActionListener(new ModalListener());
add(modalButton);

JButton modelessButton = new JButton("Modeless");
modelessButton.addActionListener(new ModelessListener());
add(modelessButton);

JButton immediateButton = new JButton("Immediate");
immediateButton.addActionListener(new ImmediateListener());
add(immediateButton);
}
private class ModalListener implements ActionListener{

@Override
public void actionPerformed(ActionEvent e) {
Color defaultColor = getBackground();
Color selected = JColorChooser.showDialog(ColorChooserPanel.this, "Set background",
defaultColor);
if(selected != null) setBackground(selected);
}
}

private class ModelessListener implements ActionListener{
private JDialog dialog;
private JColorChooser chooser;
public ModelessListener(){
chooser = new JColorChooser();
dialog = JColorChooser.createDialog(ColorChooserPanel.this, "Background Color", false,
chooser, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
setBackground(chooser.getColor());
}
},null);
}

@Override
public void actionPerformed(ActionEvent e) {
chooser.setColor(getBackground());
dialog.setVisible(true);
}
}

private class ImmediateListener implements ActionListener{
private JDialog dialog;
private JColorChooser chooser;
public ImmediateListener(){
chooser = new JColorChooser();
chooser.getSelectionModel().addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
setBackground(chooser.getColor());
}
});
dialog = new JDialog((Frame) null, false);
dialog.add(chooser);
dialog.pack();
}

@Override
public void actionPerformed(ActionEvent e) {
chooser.setColor(getBackground());
dialog.setVisible(true);
}
}
}


}

三个按钮对应的是：模式框、非模式框、非模式立刻更新页面三种

可选各种颜色更新背景

PS:昨天的内容忘记发了T T， 已追加到 （15）

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