在选中某一单元格时出现渐入效果代码,Java代码库,德仔网

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【Java】在选中某一单元格时出现渐入效果
作者:DDT / 发布于2012/6/12/ 448
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 {</div>
<div> static java.util.Random rand = new java.util.Random();</div>
<div>
 static Color listForeground, listBackground, 
 listSelectionForeground, listSelectionBackground; 
 static float[] foregroundComps, backgroundComps, 
 foregroundSelectionComps, backgroundSelectionComps;</div>
<div> 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;</div>
<div> public static final int ANIMATION_DURATION = 1000; 
 public static final int ANIMATION_REFRESH = 50;
 
 public AnimatedJList() { 
 super(); 
 addListSelectionListener (this); 
 setCellRenderer (new AnimatedCellRenderer());
 }
<div> 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);
 }
<div>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();
 }
<div>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]);</div>
<div> colorizedSelectionBackground =
 new Color (colorizedBackComps[0],
 colorizedBackComps[1],
 colorizedBackComps[2]);
}
<div>
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;
 } 
}
<div>}
</div>
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