在选中某一单元格时出现渐入效果，选中某一单元格,在选中某一单元格时出现渐

在选中某一单元格时出现渐入效果，选中某一单元格,在选中某一单元格时出现渐

在选中某一单元格时出现渐入效果

在选中某一单元格时出现渐入效果

import java.awt.*; import javax.swing.*; import javax.swing.event.*; import java.util.*;public class AnimatedJList extends JList     implements ListSelectionListener {    static java.util.Random rand = new java.util.Random();    static Color listForeground, listBackground,         listSelectionForeground, listSelectionBackground;     static float[] foregroundComps, backgroundComps,         foregroundSelectionComps, backgroundSelectionComps;    static {                UIDefaults uid = UIManager.getLookAndFeel().getDefaults();         listForeground = uid.getColor ("List.foreground");         listBackground = uid.getColor ("List.background");        listSelectionForeground = uid.getColor ("List.selectionForeground");        listSelectionBackground = uid.getColor ("List.selectionBackground");        foregroundComps =            listForeground.getRGBColorComponents(null);        foregroundSelectionComps =            listSelectionForeground.getRGBColorComponents(null);backgroundComps =            listBackground.getRGBColorComponents(null);backgroundSelectionComps =            listSelectionBackground.getRGBColorComponents(null);     }     public Color colorizedSelectionForeground,        colorizedSelectionBackground;    public static final int ANIMATION_DURATION = 1000;     public static final int ANIMATION_REFRESH = 50;    public AnimatedJList() {                super();         addListSelectionListener (this);                setCellRenderer (new AnimatedCellRenderer());    }    public void valueChanged (ListSelectionEvent lse) {        if (! lse.getValueIsAdjusting()) {            HashSet selections = new HashSet();            for (int i=0; i < getModel().getSize(); i++) {                if (getSelectionModel().isSelectedIndex(i))                    selections.add (new Integer(i));             }                        CellAnimator animator = new CellAnimator (selections.toArray());                        animator.start();        }     }public static void main (String[] args) {        JList list = new AnimatedJList ();        DefaultListModel defModel = new DefaultListModel();        list.setModel (defModel);        String[] listItems = {            "Chris", "Joshua", "Daniel", "Michael",            "Don", "Kimi", "Kelly", "Keagan"    };    Iterator it = Arrays.asList(listItems).iterator();    while (it.hasNext())        defModel.addElement (it.next());    // show list    JScrollPane scroller =        new JScrollPane (list,                          ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS,                          ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);    JFrame frame = new JFrame ("Checkbox JList");    frame.getContentPane().add (scroller);    frame.pack();    frame.setVisible(true);     } class CellAnimator extends Thread {     Object[] selections;     long startTime;     long stopTime;     public CellAnimator (Object[] s) {         selections = s;     }     public void run() {         startTime = System.currentTimeMillis();          stopTime = startTime + ANIMATION_DURATION;                     while (System.currentTimeMillis() < stopTime) {              colorizeSelections();              repaint();              try { Thread.sleep (ANIMATION_REFRESH); }              catch (InterruptedException ie) {}         }         // one more, at 100% selected color         colorizeSelections();         repaint();     }public void colorizeSelections() {     // calculate % completion relative to start/stop times        float elapsed = (float) (System.currentTimeMillis() - startTime);    float completeness = Math.min ((elapsed/ANIMATION_DURATION), 1.0f);     // calculate scaled color     float colorizedForeComps[] = new float[3];     float colorizedBackComps[] = new float[3];     for (int i=0; i<3; i++) {        colorizedForeComps[i] =           foregroundComps[i] +           (completeness *            (foregroundSelectionComps[i] - foregroundComps[i]));        colorizedBackComps[i] =           backgroundComps[i] +           (completeness *            (backgroundSelectionComps[i] - backgroundComps[i]));    }    colorizedSelectionForeground =       new Color (colorizedForeComps[0],                  colorizedForeComps[1],                  colorizedForeComps[2]);    colorizedSelectionBackground =       new Color (colorizedBackComps[0],       colorizedBackComps[1],       colorizedBackComps[2]);}class AnimatedCellRenderer extends DefaultListCellRenderer {    public Component getListCellRendererComponent(JList list,                                                  Object value,                                                  int index,                                                  boolean isSelected,                                                  boolean hasFocus) {       Component returnMe =            super.getListCellRendererComponent (list, value, index,                                                isSelected, hasFocus);       if (isSelected) {            returnMe.setForeground (colorizedSelectionForeground);            returnMe.setBackground (colorizedSelectionBackground);            /* this might be necessary if you have more              elaborate cells           if (returnMe instanceof Container) {               Component[] children =                   ((Container)returnMe).getComponents ();                System.out.println (children.length + " children");                for (int i=0;                    (children != null ) && (i<children.length); i++) {                     children[i].setForeground (colorizedSelectionForeground);                children[i].setBackground (colorizedSelectionBackground);                }           }           */           if (returnMe instanceof JComponent)               ((JComponent) returnMe).setOpaque(true);           }           return returnMe;         } }}