Aligns the first rows * cols components of parent in a grid using SpringLayout - Java Swing

Java examples for Swing:Layout Manager

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Description

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

Demo Code


//package com.java2s;
import javax.swing.*;
import java.awt.*;

public class Main {
    /**/*  w w w.  j a  v  a  2  s .co  m*/
     * Aligns the first <code>rows</code> * <code>cols</code>
     * components of <code>parent</code> in
     * a grid. Each component is as big as the maximum
     * preferred width and height of the components.
     * 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
     */
    public static void makeGrid(Container parent, int rows, int cols,
            int initialX, int initialY, int xPad, int yPad) {
        SpringLayout layout;
        try {
            layout = (SpringLayout) parent.getLayout();
        } catch (ClassCastException exc) {
            System.err
                    .println("The first argument to makeGrid must use SpringLayout.");
            return;
        }

        Spring xPadSpring = Spring.constant(xPad);
        Spring yPadSpring = Spring.constant(yPad);
        Spring initialXSpring = Spring.constant(initialX);
        Spring initialYSpring = Spring.constant(initialY);
        int max = rows * cols;

        //Calculate Springs that are the max of the width/height so that all
        //cells have the same size.
        Spring maxWidthSpring = layout.getConstraints(
                parent.getComponent(0)).getWidth();
        Spring maxHeightSpring = layout.getConstraints(
                parent.getComponent(0)).getWidth();
        for (int i = 1; i < max; i++) {
            SpringLayout.Constraints cons = layout.getConstraints(parent
                    .getComponent(i));

            maxWidthSpring = Spring.max(maxWidthSpring, cons.getWidth());
            maxHeightSpring = Spring.max(maxHeightSpring, cons.getHeight());
        }

        //Apply the new width/height Spring. This forces all the
        //components to have the same size.
        for (int i = 0; i < max; i++) {
            SpringLayout.Constraints cons = layout.getConstraints(parent
                    .getComponent(i));

            cons.setWidth(maxWidthSpring);
            cons.setHeight(maxHeightSpring);
        }

        //Then adjust the x/y constraints of all the cells so that they
        //are aligned in a grid.
        SpringLayout.Constraints lastCons = null;
        SpringLayout.Constraints lastRowCons = null;
        for (int i = 0; i < max; i++) {
            SpringLayout.Constraints cons = layout.getConstraints(parent
                    .getComponent(i));
            if (i % cols == 0) { //start of new row
                lastRowCons = lastCons;
                cons.setX(initialXSpring);
            } else { //x position depends on previous component
                cons.setX(Spring.sum(
                        lastCons.getConstraint(SpringLayout.EAST),
                        xPadSpring));
            }

            if (i / cols == 0) { //first row
                cons.setY(initialYSpring);
            } else { //y position depends on previous row
                cons.setY(Spring.sum(
                        lastRowCons.getConstraint(SpringLayout.SOUTH),
                        yPadSpring));
            }
            lastCons = cons;
        }

        //Set the parent's size.
        SpringLayout.Constraints pCons = layout.getConstraints(parent);
        pCons.setConstraint(
                SpringLayout.SOUTH,
                Spring.sum(Spring.constant(yPad),
                        lastCons.getConstraint(SpringLayout.SOUTH)));
        pCons.setConstraint(
                SpringLayout.EAST,
                Spring.sum(Spring.constant(xPad),
                        lastCons.getConstraint(SpringLayout.EAST)));
    }
}

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