CompoundIcon.java

package net.squiz.matrix.core;


import java.awt.*;
import javax.swing.*;
import java.util.*;

public class CompoundIcon implements Icon, SwingConstants {

    protected static final int[] VALID_X = {LEFT, RIGHT, CENTER};

    protected static final int[] VALID_Y = {TOP, BOTTOM, CENTER};

    protected Icon mainIcon, decorator;

    protected int yAlignment = BOTTOM;

    protected int xAlignment = LEFT;

    private static Map disabledIcons = new HashMap();

    public CompoundIcon(
            Icon mainIcon,
            Icon decorator,
            int xAlignment,
            int yAlignment) {
        if (decorator.getIconWidth() > mainIcon.getIconWidth()) {
            throw new IllegalArgumentException(
                "decorator icon is wider than main icon");
        }
        if (decorator.getIconHeight() > mainIcon.getIconHeight()) {
            throw new IllegalArgumentException(
                "decorator icon is higher than main icon");
        }
        if (!isLegalValue(xAlignment, VALID_X)) {
            throw new IllegalArgumentException(
                "xAlignment must be LEFT, RIGHT or CENTER");
        }
        if (!isLegalValue(yAlignment, VALID_Y)) {
            throw new IllegalArgumentException(
                "yAlignment must be TOP, BOTTOM or CENTER");
        }

        this.mainIcon = mainIcon;
        this.decorator = decorator;
        this.xAlignment = xAlignment;
        this.yAlignment = yAlignment;
    }

    public boolean isLegalValue(int value, int[] legal) {
        for (int i = 0; i < legal.length; i++) {
            if (value == legal[i])
                return true;
        }
        return false;
    }

    public Icon getDisabledIcon() {
        if (!disabledIcons.containsKey(mainIcon)) {
            Image grayImage = GrayFilter.createDisabledImage(((ImageIcon) mainIcon).getImage());
            disabledIcons.put(mainIcon, grayImage);
        }
        return new ImageIcon((Image)disabledIcons.get(mainIcon));
    }

    public int getIconWidth() {
        return mainIcon.getIconWidth();
    }

    public int getIconHeight() {
        return mainIcon.getIconHeight();
    }

    public void paintIcon(Component c, Graphics g, int x, int y) {
        mainIcon.paintIcon(c, g, x, y);
        int w = getIconWidth();
        int h = getIconHeight();

        if (xAlignment == CENTER)
            x += (w - decorator.getIconWidth()) / 2;
        if (xAlignment == RIGHT)
            x += (w - decorator.getIconWidth());
        if (yAlignment == CENTER)
            y += (h - decorator.getIconHeight()) / 2;
        if (yAlignment == BOTTOM)
            y += (h - decorator.getIconHeight());
        decorator.paintIcon(c, g, x, y);
    }
}