《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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