/* * Used by BoxLayoutDemo.java.*/import java.awt.*;import java.awt.event.*;import javax.swing.*;/** A rectangle that has a fixed size. */class BLDComponent extends JComponent                   implements MouseListener {    private Color normalHue;    private final Dimension preferredSize;    private String name;    private boolean restrictMaximumSize;    private boolean printSize;    public BLDComponent(float alignmentX, float hue,                        int shortSideSize,                        boolean restrictSize,                        boolean printSize,                        String name) {        this.name = name;        this.restrictMaximumSize = restrictSize;        this.printSize = printSize;        setAlignmentX(alignmentX);        normalHue = Color.getHSBColor(hue, 0.4f, 0.85f);        preferredSize = new Dimension(shortSideSize*2,                                      shortSideSize);        addMouseListener(this);    }    //The MouseListener interface requires that we define    //mousePressed, mouseReleased, mouseEntered, mouseExited,    //and mouseClicked.    public void mousePressed(MouseEvent e) {        int width = getWidth();        float alignment = (float)(e.getX())                        / (float)width;        // Round to the nearest 1/10th.        int tmp = Math.round(alignment * 10.0f);        alignment = (float)tmp / 10.0f;        setAlignmentX(alignment);        revalidate(); // this GUI needs relayout        repaint();    }    public void mouseReleased(MouseEvent e) { }    public void mouseEntered(MouseEvent e) { }    public void mouseExited(MouseEvent e) { }    public void mouseClicked(MouseEvent e) { }    /**     * Our BLDComponents are completely opaque, so we override     * this method to return true.  This lets the painting     * system know that it doesn't need to paint any covered     * part of the components underneath this component.  The     * end result is possibly improved painting performance.     */    public boolean isOpaque() {        return true;    }    public void paint(Graphics g) {        int width = getWidth();        int height = getHeight();        float alignmentX = getAlignmentX();        g.setColor(normalHue);        g.fill3DRect(0, 0, width, height, true);        /* Draw a vertical white line at the alignment point.*/        // XXX: This code is probably not the best.        g.setColor(Color.white);        int x = (int)(alignmentX * (float)width) - 1;        g.drawLine(x, 0, x, height - 1);        /* Say what the alignment point is. */        g.setColor(Color.black);        g.drawString(Float.toString(alignmentX), 3, height - 3);        if (printSize) {            System.out.println("BLDComponent " + name + ": size is "                               + width + "x" + height                               + "; preferred size is "                               + getPreferredSize().width + "x"                               + getPreferredSize().height);        }    }    public Dimension getPreferredSize() {        return preferredSize;    }    public Dimension getMinimumSize() {        return preferredSize;    }    public Dimension getMaximumSize() {        if (restrictMaximumSize) {            return preferredSize;        } else {            return super.getMaximumSize();        }    }    public void setSizeRestriction(boolean restrictSize) {        restrictMaximumSize = restrictSize;    }}