zkoss/zk

/* Colors.java

{{IS_NOTE
 Purpose:
  
 Description:
  
 History:
  Jan 29, 2012 4:57:26 PM , Created by simonpai
}}IS_NOTE

Copyright (C) 2011 Potix Corporation. All Rights Reserved.

{{IS_RIGHT
}}IS_RIGHT
*/
package org.zkoss.web.fn;

/**
 *
 * @author simonpai
 */
/**package*/
class Colors {

    public static Color parseCSS(String code) {
        int[] arr = parseCSS(code, null);
        return arr == null ? null : new Color(arr[0], arr[1], arr[2], arr[3]);
    }

    public static int[] parseCSS(String code, int[] arr) {
        if (code == null)
            return arr;
        if (arr == null)
            arr = new int[4];
        code = code.trim();
        if (code.startsWith("#")) {
            boolean sh = code.length() == 4; // short hand
            int r = Integer.parseInt(code.substring(1, sh ? 2 : 3), 16);
            int g = Integer.parseInt(code.substring(sh ? 2 : 3, sh ? 3 : 5), 16);
            int b = Integer.parseInt(code.substring(sh ? 3 : 5, sh ? 4 : 7), 16);
            if (sh) {
                r *= 17;
                g *= 17;
                b *= 17;
            }
            arr[0] = r;
            arr[1] = g;
            arr[2] = b;
            arr[3] = 255;
        } else if (code.startsWith("rgba(") && code.endsWith(")")) {
            String s = code.substring(5, code.length() - 1);
            String[] bands = s.split(",");
            for (int i = 0; i < 3; i++) {
                String b = bands[i].trim();
                arr[i] = Integer.parseInt(b);
            }
            String b = bands[3].trim();
            arr[3] = (int) (255 * Double.parseDouble(b));
        }
        return arr;
    }

    public static String toCSS(Color color) {
        return color.getAlpha() < 255 ? getRGBAString(color) : getHexString(color);
    }

    public static String toCSS(int[] color) {
        if (color.length > 3)
            return toCSS(new Color(color[0], color[1], color[2], color[3]));
        return toCSS(new Color(color[0], color[1], color[2], 255));
    }

    public static String getRGBAString(Color c) {
        return "rgba(" + c.getRed() + ", " + c.getGreen() + ", " + c.getBlue() + ", " + c.getAlpha() + ")";
    }

    public static String getRGBAString(int[] color) {
        return "rgba(" + color[0] + ", " + color[1] + ", " + color[2] + ", " + color[3] + ")";
    }

    public static String getHexString(Color c) {
        String hex = Integer.toHexString(c.getRGB() & 0x00ffffff).toUpperCase();
        hex = repeat('0', 6 - hex.length()) + hex;
        int alpha = c.getAlpha();
        alpha = alpha == 255 ? -1 : alpha * 20 / 51;
        return '#' + hex + (alpha < 0 ? "" : (" (" + alpha + "%)"));
    }

    public static String getIEHexString(Color c) {
        String hex = Integer.toHexString(c.getRGB() & 0x00ffffff).toUpperCase();
        hex = repeat('0', 6 - hex.length()) + hex;
        int alpha = c.getAlpha();

        String ah = Integer.toHexString(alpha & 0x00ffffff).toUpperCase();
        ah = repeat('0', 2 - ah.length()) + ah;
        return '#' + ah + hex;
    }

    private static String repeat(char c, int i) {
        char[] cs = new char[i];
        for (int j = 0; j < i; j++)
            cs[j] = c;
        return new String(cs);
    }
}