#How do I make a button turn green in this specific scenario?

24 messages · Page 1 of 1 (latest)

old zealot
# 
JPanel[][] sarr = new JPanel[mr][mc];
    int[][] num = new int[11][25];

    SeatPage() {
        ImageIcon a = new ImageIcon("Seat.png");
        GridLayout gl = new GridLayout(mr, mc, 10, 10);

        JPanel jp=new JPanel();
        jp.setBackground(Color.BLACK);
        jp.setLayout(gl);
        String l="";
        int lc=0;int nc=0;
        JFrame frame = new JFrame();
        for (int i = 0; i < mr; i++) {
            l = (char) ('A' + (lc)) + "";
            for (int j = 0; j < mc; j++) {
                sarr[i][j] = new JPanel();
                sarr[i][j].setBackground(Color.BLACK);

                if(i==0 || j==0 || i==mr-1 || j==mc-1 || j==6 || j==22 || i==2 || i==11) {
                    jp.add(sarr[i][j]);
                    continue;
                }
                nc++;

                JButton b = new JButton(l+nc, a);
                b.setBackground(Color.white);
                b.setHorizontalTextPosition(JButton.CENTER);
                b.setVerticalTextPosition(JButton.CENTER);
                b.setFocusable(false);
                b.setBorder(BorderFactory.createLineBorder(Color.black, 5));
                b.addActionListener(this);
                sarr[i][j].add(b);
                jp.add(sarr[i][j]);
            }
            if(!(i==0 || i==mr-1 || i==2 || i==11))
                lc++;
            nc=0;
        }
        System.out.println(l+lc);

        frame.setIconImage(new ImageIcon("logo.png").getImage());
        frame.setExtendedState(SeatPage.MAXIMIZED_BOTH);
        frame.add(jp);
        frame.setForeground(Color.BLACK);
        frame.setVisible(true);
    }

So... the button is in a JPanel, which is in a GridLayout of another JPanel... which is in the JFrame. I am not sure if I summarized this correctly
I am not particularly familiar with awt or swing... I am just fixing this code from a friend, and it has been shortened a lot...

red hazelBOT
#

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stable hare
#

I think you need to set your button's background colour

# 
b.setBackground(Color.GREEN);
old zealot
#

in the actionPerformed() overidden method right?

#

When I am clicking a button the e.getSource() should be that button

old zealot
stable hare
#

isn't b still the only JButton you add?

old zealot
#

Well, here's another block:

# 
@Override
    public void actionPerformed(ActionEvent e) {
        for (int i = 0; i < mr; i++) {
            for (int j = 0; j < mc; j++) {
                if (e.getSource() == sarr[i][j]) {
                    System.out.println("fv");
                    if(((JButton)sarr[i][j].getComponent(0)).getBackground().equals(Color.white))
                        num[i][j]=1;
                     else if (((JButton)sarr[i][j].getComponent(0)).getBackground().equals(Color.green))
                        num[i][j]=0;

                    for(int x=0;x<11;x++) {
                        for(int y=0;y<25;y++) {
                            JButton t =  (JButton) sarr[x][y].getComponent(0);
                            if(num[x][y]==1)
                                t.setBackground(Color.green);
                            else
                                t.setBackground(Color.white);
                        }
                    }
                    break;
                }
            }
        }
    }
#

The sarr array is of JPanel type; The JButton is part of the JPanel

#

Ah, should have posted my question properly

#

e.getSource() == sarr[i][j].getComponent(0)

#

THe problem is this line specifically

#

It says there is no child

#

When there should be one, the JButton

stable hare
#

e.getSource() is null or what?

old zealot
#

Here's the error(give me a min)

stable hare
#

sorry I'm not really an expert in Java GUI

old zealot
# 
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: No such child: 0
    at java.desktop/java.awt.Container.getComponent(Container.java:354)
    at SeatPage.actionPerformed(SeatPage.java:64)
old zealot
#

This used to be 200 lines

red hazelBOT
#

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