目前在这个项目中，我能够选择特定的网格并将其改为蓝色背景，并保持SHIFT键。
现在，我想选择多个网格并同时分配新的背景颜色。
我该怎么办？
源代码：
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;
import javax.swing.border.LineBorder;
//based on @trashgod code from http://stackoverflow.com/a/7706684/714968
public class FocusingPanel extends JFrame {
private static final long serialVersionUID = 1L;
private int elements = 10;
private List<GridPanel> list = new ArrayList<GridPanel>();
private final JFrame mainFrame = new JFrame();
private final JPanel fatherPanel = new JPanel();
public FocusingPanel() {
fatherPanel.setLayout(new GridLayout(elements, elements));
for (int i = 0; i < elements * elements; i++) {
int row = i / elements;
int col = i % elements;
GridPanel gb = new GridPanel(row, col);
list.add(gb);
fatherPanel.add(gb);
}
mainFrame.setLayout(new BorderLayout(5, 5));
mainFrame.setDefaultCloseOperation(EXIT_ON_CLOSE);
mainFrame.add(fatherPanel, BorderLayout.CENTER);
mainFrame.pack();
mainFrame.setVisible(true);
}
private GridPanel getGridPanel(int r, int c) {
int index = r * elements + c;
return list.get(index);
}
private class GridPanel extends JPanel {
private int row;
private int col;
@Override
public Dimension getPreferredSize() {
return new Dimension(20, 20);
}
public GridPanel(int row, int col) {
this.row = row;
this.col = col;
this.setBackground(Color.red);
this.setBorder(new LineBorder(Color.black,1));
this.addMouseListener(new MouseListener() {
//*@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mousePressed(MouseEvent e) {
if(e.isShiftDown()){
setBackground(Color.blue);
}
}
@Override
public void mouseReleased(MouseEvent e) {
//setBackground(Color.green);
}
@Override
public void mouseClicked(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
//setBackground(Color.red);
}
});
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
FocusingPanel focusingPanel = new FocusingPanel();
}
});
}
}