如何解决更改JButtons背景的最佳方法
|| 现在我通过使用更改按钮的背景色button.setBackground(Color.WHITE);
grid = new JPanel(new GridLayout(64,64,0));
new javax.swing.Timer(300,new ActionListener() {
int counter = 0;
public void actionPerformed(ActionEvent e) {
if (counter >= counterMax) {
((Timer) e.getSource()).stop();
}
Color bckgrndColor = (counter % 2 == 0) ? flashColor : Color.white;
for (JButton button : gridButton) {
button.setBackground(bckgrndColor);
}
counter++;
}
}).start();
解决方法
您看到各个框分别被重新粉刷的事实表明关闭了双缓冲，或者按钮UI中的粉刷代码使用了
paintImmediately()
grid.setVisible(false);
for (Component comp : grid.getComponents()) {
comp.setBackground(color);
}
grid.setVisible(true);
import java.awt.*;
import java.awt.event.*;
import java.util.Observable;
import java.util.Observer;
import java.util.Random;
import javax.swing.*;
/** @see https://stackoverflow.com/questions/6117908 */
public class UpdateTest {
private static final int ROW = 64;
private static final int COL = 64;
private static final int MAX = COL * ROW;
private final DataModel model = new DataModel(MAX);
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new UpdateTest().create();
}
});
}
void create() {
JPanel panel = new JPanel();
panel.setLayout(new GridLayout(ROW,COL));
for (int i = 0; i < MAX; i++) {
panel.add(new ViewPanel(model,i));
}
Timer timer = new Timer(1000,new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
long start = System.nanoTime();
model.update();
System.out.println(
(System.nanoTime() - start) / (1000 * 1000));
}
});
JFrame f = new JFrame(\"JTextTest\");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new JScrollPane(panel),BorderLayout.CENTER);
f.setPreferredSize(new Dimension(800,600));
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
timer.start();
}
private static class ViewPanel extends JPanel implements Observer {
private final JButton item = new JButton();
private DataModel model;
private int index;
public ViewPanel(DataModel model,int i) {
this.model = model;
this.index = i;
this.add(item);
item.setText(String.valueOf(i));
item.setOpaque(true);
item.setBackground(new Color(model.get(index)));
model.addObserver(this);
}
@Override
public void update(Observable o,Object arg) {
int value = model.get(index);
item.setBackground(new Color(value));
}
}
private static class DataModel extends Observable {
private final Random rnd = new Random();
private final int[] data;
public DataModel(int n) {
data = new int[n];
fillData();
}
public void update() {
fillData();
this.setChanged();
this.notifyObservers();
}
public int get(int i) {
return data[i];
}
private void fillData() {
for (int i = 0; i < data.length; i++) {
data[i] = rnd.nextInt();
}
}
}
}
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