e883. adding a custom color chooser panel to a jcolorchooser dialog.txt

这里面包含了一百多个JAVA源文件

This example creates a color chooser panel with three colored buttons. Clicking on a button changes the selected color to the color of the button. 
    JColorChooser chooser = new JColorChooser();
    chooser.addChooserPanel(new MyChooserPanel());
    
    public class MyChooserPanel extends AbstractColorChooserPanel {
        // These are the methods that must be implemented
        // in order to create a color chooser panel.
    
        // This is called once to initialize the panel.
        public void buildChooser() {
            setLayout(new GridLayout(0, 3));
            makeAddButton("Red", Color.red);
            makeAddButton("Green", Color.green);
            makeAddButton("Blue", Color.blue);
        }
    
        // This method is called whenever the user chooses this panel.
        // This method should retrieve the currently selected color.
        public void updateChooser() {
        }
    
        // This method is called to retrieve the label used
        // in the tab that selects this panel.
        public String getDisplayName() {
            return "MyChooserPanel";
        }
    
        // This method is currently not used.
        public Icon getSmallDisplayIcon() {
            return null;
        }
    
        // This method is currently not used.
        public Icon getLargeDisplayIcon() {
            return null;
        }
    
        // These are helper methods specifically for this example
    
        // Creates a color button and adds it to this panel.
        private void makeAddButton(String name, Color color) {
            JButton button = new JButton(name);
            button.setBackground(color);
            button.setAction(setColorAction);
            add(button);
        }
    
        // This action takes the background color of the button
        // and uses it to set the selected color.
        Action setColorAction  = new AbstractAction() {
            public void actionPerformed(ActionEvent evt) {
                JButton button = (JButton)evt.getSource();
    
                getColorSelectionModel().setSelectedColor(button.getBackground());
            }
        };
    
    }