MyThemeProvider.java

/**
 * Copyright 2010 the original author or authors.
 * 
 * This file is part of Zksample2. http://zksample2.sourceforge.net/
 *
 * Zksample2 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Zksample2 is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Zksample2.  If not, see <http://www.gnu.org/licenses/gpl.html>.
 */
package de.forsthaus.webui.util;

import java.io.Serializable;
import java.util.Collection;
import java.util.List;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.zkoss.zk.ui.Execution;
import org.zkoss.zk.ui.util.ThemeProvider;

public class MyThemeProvider implements ThemeProvider, Serializable {

	private static final long serialVersionUID = 1L;

	private transient static String _cssPrefix = "~./css/norm";
	private transient static String _fsCookieName = "zkdemotfs";
	private transient static String _skinCookieName = "zkdemoskin";

	@Override
	public Collection getThemeURIs(Execution exe, List uris) {

		int size = uris.size();

		for (int i = 0; i < size; i++) {
			String uri = (String) uris.get(i);
			if (uri.startsWith(_cssPrefix)) {
				uri = _cssPrefix + getFontSizeCookie(exe) + uri.substring(_cssPrefix.length());
				uris.set(i, uri);
			}
		}

		if ("silvergray".equals(getSkinCookie(exe))) {
			uris.add("~./silvergray/color.css.dsp");
			uris.add("~./silvergray/img.css.dsp");
		}

		return uris;
	}

	/**
	 * get font size value from cookie. <br>
	 * 
	 * @param exe
	 * @return "lg" for larger font, "sm" for smaler font or "" for normal font.
	 */
	public static String getFontSizeCookie(Execution exe) {
		Cookie[] cookies = ((HttpServletRequest) exe.getNativeRequest()).getCookies();

		if (cookies != null) {
			for (int i = 0; i < cookies.length; i++) {
				if (_fsCookieName.equals(cookies[i].getName())) {
					String fs = cookies[i].getValue();
					if ("lg".equals(fs)) {
						return "lg";
					} else if ("sm".equals(fs)) {
						return "sm";
					}
				}
			}
		}

		return "";
	}

	/**
	 * set font size value to cookie
	 * 
	 * @param exe
	 * @param fontSize
	 *            "lg" for larger font, "sm" for smaler font or "" for normal
	 *            font.
	 */
	public static void setFontSizeCookie(Execution exe, String fontSize) {

		String fs = "";
		if ("lg".equals(fontSize)) {
			fs = "lg";
		} else if ("sm".endsWith(fontSize)) {
			fs = "sm";
		}

		Cookie cookie = new Cookie(_fsCookieName, fs);
		cookie.setMaxAge(60 * 60 * 24 * 30); // store 30 days
		String cp = exe.getContextPath();
		cookie.setPath(cp);
		((HttpServletResponse) exe.getNativeResponse()).addCookie(cookie);
	}

	/**
	 * get the skin value from cookie. <br>
	 * 
	 * @param exe
	 * @return
	 */
	public static String getSkinCookie(Execution exe) {

		Cookie[] cookies = ((HttpServletRequest) exe.getNativeRequest()).getCookies();

		if (cookies != null) {
			for (int i = 0; i < cookies.length; i++) {
				if (_skinCookieName.equals(cookies[i].getName())) {
					String fs = cookies[i].getValue();
					if (fs != null) {
						return fs;
					}
				}
			}
		}
		return "";
	}

	/**
	 * set skin value to cookie. <br>
	 */
	public static void setSkinCookie(Execution exe, String skin) {

		Cookie cookie = new Cookie(_skinCookieName, skin);
		cookie.setMaxAge(60 * 60 * 24 * 30); // store 30 days
		String cp = exe.getContextPath();
		((HttpServletResponse) exe.getNativeRequest()).addCookie(cookie);

	}

	public void setTheme() {
		// Executions.getCurrent().getDesktop().getWebApp().setAttribute("style",
		// uris.get(0));
	}

	@Override
	public String beforeWCS(Execution exec, String uri) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public String beforeWidgetCSS(Execution exec, String uri) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public int getWCSCacheControl(Execution exec, String uri) {
		// TODO Auto-generated method stub
		return 0;
	}
}