Java Swing SpringLayout fixCellWidth(Container parent, int rows, int cols, int initialX, int initialY, int xPad, int yPad, int[] maxX, int[] maxY)

Description

Aligns the first rows * cols components of parent in a grid.

License

Open Source License

Parameter

Parameter	Description
rows	number of rows
cols	number of columns
initialX	x location to start the grid at
initialY	y location to start the grid at
xPad	x padding between cells
yPad	y padding between cells
maxX	the maximum width of all cells in a row
maxY	the maximum height of all cells in a column

Declaration

public static void fixCellWidth(Container parent, int rows, int cols, int initialX, int initialY, int xPad,
        int yPad, int[] maxX, int[] maxY) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.awt.Component;
import java.awt.Container;
import javax.swing.Spring;
import javax.swing.SpringLayout;

public class Main {
    /**//ww  w. j  a v  a 2  s.c o  m
     * Aligns the first <code>rows</code> * <code>cols</code>
     * components of <code>parent</code> in
     * a grid. Each component in a column is as wide as the maximum
     * preferred width of the components in that column;
     * height is similarly determined for each row.
     * The parent is made just big enough to fit them all.
     *
     * @param rows number of rows
     * @param cols number of columns
     * @param initialX x location to start the grid at
     * @param initialY y location to start the grid at
     * @param xPad x padding between cells
     * @param yPad y padding between cells
     * @param maxX the maximum width of all cells in a row
     * @param maxY the maximum height of all cells in a column
     */
    public static void fixCellWidth(Container parent, int rows, int cols, int initialX, int initialY, int xPad,
            int yPad, int[] maxX, int[] maxY) {
        SpringLayout layout;
        try {
            layout = (SpringLayout) parent.getLayout();
        } catch (ClassCastException exc) {
            System.err.println("The first argument to makeCompactGrid must use SpringLayout.");
            return;
        }

        //Align all cells in each column and make them the same width.
        Spring x = Spring.constant(initialX);
        for (int c = 0; c < cols; c++) {
            if (maxX != null) {
                Spring width = Spring.constant(maxX[c]);
                for (int r = 0; r < rows; r++) {
                    SpringLayout.Constraints constraints = getConstraintsForCell(r, c, parent, cols);
                    constraints.setX(x);
                    if (maxX[c] > 0)
                        constraints.setWidth(width);
                    else
                        width = constraints.getWidth();
                }
                x = Spring.sum(x, Spring.sum(width, Spring.constant(xPad)));
            }
        }

        //Align all cells in each row and make them the same height.
        Spring y = Spring.constant(initialY);
        for (int r = 0; r < rows; r++) {
            if (maxY != null) { // null means don't do anything to anything
                Spring height = Spring.constant(maxY[r]);
                for (int c = 0; c < cols; c++) {
                    SpringLayout.Constraints constraints = getConstraintsForCell(r, c, parent, cols);
                    constraints.setY(y);
                    if (maxY[r] > 0) {
                        constraints.setHeight(height);
                    } else {
                        height = constraints.getHeight();
                    }
                }
                y = Spring.sum(y, Spring.sum(height, Spring.constant(yPad)));
            }
        }

        //Set the parent's size.
        SpringLayout.Constraints pCons = layout.getConstraints(parent);
        if (maxY != null)
            pCons.setConstraint(SpringLayout.SOUTH, y);
        if (maxX != null)
            pCons.setConstraint(SpringLayout.EAST, x);
    }

    private static SpringLayout.Constraints getConstraintsForCell(int row, int col, Container parent, int cols) {
        SpringLayout layout = (SpringLayout) parent.getLayout();
        Component c = parent.getComponent(row * cols + col);
        return layout.getConstraints(c);
    }
}

Related

1. getConstraintsForCell(int row, int col, Container parent, int cols)
2. makeGrid(final Container parent, final int rows, final int cols, final int initialX, final int initialY, final int xPad, final int yPad)
3. makeOneLineGrid(Container parent)
4. singleColumn(final Container container, final int initialY, final int yPad)