Making co-ordinates co-operate!

[Mike Smike]

Hi guys!

I'm trying to make a grid of 10 x 10 textfields. I need each textfield to be referenced by an individual co-ordinate. They must start at (0,0) which should be at the bottom left of the grid (like on a normal graph).

So far I have managed to make a 10 x 10 grid of text fields, and each is simply numbered from 0 - 99 starting at the top left. This is no good unfortunately. This is what I've managed:

public void setSquares(JPanel p)
    {
        for(int i = 0; i < iMax*jMax; ++i)
            {
            p.add(new JTextField("" + i));  
            }
    } 

And then I just call

 setSquares(pane)

in my main method.

Any help would be greatly appreciated! Thank you muchos mooses!
Mikey

[Landon Blake]

Have you thought about trying a JPanel with using a GridLayout Layout Manager? I think it will accomplish what you need.

http://java.sun.com/docs/books/tutorial/uiswing/layout/grid.html

Landon

[Mike Smike]

I am using the GridLayout. Here's a bit more of my code:

public Interface(int iMax, int jMax) throws IOException
    {
        super("Simple WarGame");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel pane = new JPanel();
        pane.setSize(600,600);
        pane.setLayout(new GridLayout(iMax, jMax));
        setSquares(pane);
        getCoords();
        setContentPane(pane);
        pane.setVisible(true);
    }
    
    /**
     * Function to deploy units automatically
     */
    public void setSquares(JPanel p)
    {
        for(int i = 0; i < iMax*jMax; ++i)
            {
            p.add(new JTextField("" + i));  
            }
    } 

However, I want to somehow create a loop which numbers/references each cell, starting at the bottom left, with their co-ordinate, i.e (0,0),(0,1),(9,3) etc.

Sorry for not making that very clear. Please help

Mike

[Dirk Schreckmann]

Moving this to the Swing / AWT / SWT / JFace forum...

[Craig Wood]

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class CellLayout
{
    CellStore[][] cells;
    CellSelector cellSelector;
 
    public CellLayout()
    {
        // label to demonstrate cell selection
        JLabel locationLabel = new JLabel();
        locationLabel.setHorizontalAlignment(JLabel.CENTER);
        Dimension d = locationLabel.getPreferredSize();
        d.height = 20;
        locationLabel.setPreferredSize(d);
 
        // listener to receive cell selections,
        // added to JTextFields in getCellPanel method
        cellSelector = new CellSelector(locationLabel);
 
        // make cell grid
        int rows = 10;
        int cols = 10;
        cells = createCells(rows, cols);
        JPanel panel = getCellPanel(cells);
 
        JFrame f = new JFrame("select any cell");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(panel);
        f.getContentPane().add(locationLabel, "South");
        f.setSize(600,600);
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
 
    /**
     * create cells to be used in the gui grid
     */
    private CellStore[][] createCells(int rows, int cols)
    {
        CellStore[][] cells = new CellStore[rows][cols];
        for(int row = 0; row < rows; row++)
            for(int col = 0; col < cols; col++)
                cells[row][col] = new CellStore(row, col);
        return cells;
    }
 
    /**
     * create grid of cells for the gui
     * add MouseListener to JTextField of each cell
     */
    private JPanel getCellPanel(CellStore[][] cells)
    {
        JPanel panel = new JPanel();
        int rows = cells.length;
        int cols = cells[0].length;
        panel.setLayout(new GridLayout(rows, cols));
        for(int row = rows - 1; row >= 0; row--)  // reverse order of rows
            for(int col = 0; col < cols; col++)
            {
                CellStore cell = cells[row][col];
                JTextField tf = cell.field;
                tf.addMouseListener(cellSelector);
                tf.setText("(" + row + ", " + col + ")");
                panel.add(tf);
            }
        return panel;
    }
 
    public static void main(String[] args)
    {
        new CellLayout();
    }
}
 
/**
 * data store class for each cell in grid
 */
class CellStore
{
    int row, col;
    JTextField field;
 
    public CellStore(int row, int col)
    {
        this.row = row;
        this.col = col;
        field = new JTextField();
        field.setHorizontalAlignment(JTextField.CENTER);
        // store the location in the JTextField as a property
        // using a JComponent method -> see JTextField api
        field.putClientProperty("loc", new int[] { row, col });
    }
}
 
/**
 * to demonstrate cell selection and recovery of grid location
 * by showing cell location in JLabel in south section of gui
 * and highlighting cell text in red
 */
class CellSelector extends MouseAdapter
{
    JLabel label;
    JTextField selectedField;  // state for last JTextField selected
 
    public CellSelector(JLabel label)
    {
        this.label = label;
        // to avoid NullPointer first time through mousePressed
        selectedField = new JTextField();
    }
 
    public void mousePressed(MouseEvent e)
    {
        JTextField tf = (JTextField)e.getSource();
        selectedField.setForeground(Color.black);
        tf.setForeground(Color.red);
        int[] cellLocation = (int[])tf.getClientProperty("loc");
        int row = cellLocation[0];
        int col = cellLocation[1];
        label.setText("cell (" + row + ", " + col + ")  selected");
        selectedField = tf;
    }
}

[Mike Smike]

Thank you muchos Mr Craig Wood! That will help me heaps! You're a very good ranch hand!

Mike