/* Copyright (C) 2002 J. M. Spivey */

import java.awt.*;

/** A layout manager that maintains a grid, but with variable
 * column widths and row heights.  Components must be added by
 * rows in left-to-right order.
 * 
 * Implemented as a specialized version of GridBagLayout,
 * with (thankfully) a simple interface.
 */
public class VariGridLayout extends GridBagLayout {
    private int nrows, ncols;
    private int row = 0, col = 0;
    private GridBagConstraints gbc = new GridBagConstraints();
    private Insets insets;
    
    /** Construct a layout that is nrows x ncols */
    public VariGridLayout(int nrows, int ncols) {
        this(nrows, ncols, 0);
    }
    
    /** Construct a layout that is nrows x ncols, 
     * with same inset all round. */
    public VariGridLayout(int nrows, int ncols, int inset) {
        this.nrows = nrows;
        this.ncols = ncols;
        
        insets = new Insets(inset, inset, inset, inset);
        gbc.fill = GridBagConstraints.BOTH;
        gbc.insets = insets;
    }

    /** Add another component in row-by-row order */
    public void addLayoutComponent(Component c, Object cns) {
        gbc.gridx = col;
        gbc.gridy = row;
        super.addLayoutComponent(c, gbc);
        col++;
        if (col == ncols) {
            col = 0; row++;
        }
    }
}