Changing cell background on click in another cell

问题

I am trying to build a 9x9 sudoku puzzle. For the UI part, I want to change the background of cell when clicked and return to normal when any other cell is clicked. Below is my Cell Class.

    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import javax.swing.border.BevelBorder;

    public class Cell extends JPanel implements MouseListener{

    Cell[][] cell;
    private int x;//x pos;
    private int y;//y pos;
    private int num=0;
    private JLabel lnum;
    private Color bg;
    private static int xpos=-1;
    private static int ypos=-1;
    private static Color back;
    public Cell(Cell[][] cell,int x, int y)
    {
        this.cell=cell;
        this.x=x;
        this.y=y;
        x+=1; y+=1;
        setBorder(BorderFactory.createLineBorder(Color.yellow));
        if((x%6>=1&&x%6<=3)&&(y%6==0||y%6>3)||(y%6>=1&&y%6<=3)&&(x%6==0||x%6>3))
            bg=Color.BLUE;
        else
            bg=Color.BLACK;
        setBackground(bg);
        setPreferredSize(new Dimension(50,50));
        lnum=new JLabel(String.valueOf(num),null,JLabel.CENTER);
        lnum.setForeground(Color.green);
        add(lnum,SwingConstants.CENTER);
        addMouseListener(this);
    }

    @Override
    public void mouseClicked(MouseEvent e) {

        if(xpos!=-1)
        {
        cell[xpos][ypos].setBackground(back);
        cell[xpos][ypos].setBorder(BorderFactory.createLineBorder(Color.yellow));
        }
        xpos=x;
        ypos=y; 
        back=bg;
        setBackground(Color.LIGHT_GRAY);
        setBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED,
                                                        Color.cyan,Color.BLUE));
    }

    @Override
    public void mousePressed(MouseEvent e) {

    }

    @Override
    public void mouseReleased(MouseEvent e) {
    }

    @Override
    public void mouseEntered(MouseEvent e) {
        if(x!=xpos&&y!=ypos)
        {
        setBackground(Color.WHITE);
        setBorder(BorderFactory.createLineBorder(Color.RED));
        }
    }

    @Override
    public void mouseExited(MouseEvent e) {
        if(x!=xpos&&y!=ypos)
        {
        setBackground(bg);
        setBorder(BorderFactory.createLineBorder(Color.yellow));
        }
    }

}

However, reverting back to normal background color and border of a cell after clicking one and then another cell is not working. Please help. Thanks in advance.

回答1:

You'd be better to use an AbstractButton, such as JButton, which includes this capability for each supported Look & Feel. You can override the defaults using UIManager.put() for button-related keys, listed below, as shown here. This CellTest may also suggest some ideas. Right-click to see the context menu, and tab to see how the focus listener works.

Button.background
Button.border
Button.darkShadow
Button.defaultButtonFollowsFocus
Button.disabledText
Button.font
Button.foreground
Button.highlight
Button.light
Button.margin
Button.opaque
Button.select
Button.shadow
Button.textIconGap
Button.textShiftOffset

来源：https://stackoverflow.com/questions/12619965/changing-cell-background-on-click-in-another-cell

标签

java

swing

background

jpanel

mouselistener