HTMLCalendar.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2011 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.turro.html.calendar;
 
import java.io.IOException;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;
import org.turro.string.ObjectString;
import org.turro.elephant.context.IElement;
import org.turro.elephant.impl.util.Localizer;
import org.turro.html.HTMLComponent;
import org.turro.i18n.I_;
 
public class HTMLCalendar extends HTMLComponent {
  protected IDayRenderer dayRenderer = null;
  protected Date date;
  protected Locale locale;
  protected String[] dayNames, monthNames;    
  
  public HTMLCalendar(IElement iel) throws IOException {
    super(iel);
    this.constructor = iel.getConstructor();
    locale = I_.api().used();
    dayNames = CalendarUtil.getDayNames(locale, true);
    monthNames = CalendarUtil.getMonthNames(locale, false);
 
    // Calendar state
    String sdate = constructor.getParameter("caldate");
    if(sdate != null) {
      date = (Date) ObjectString.parseString(sdate, ObjectString.COMPRESSED_DATE_PATTERN, Date.class, true);
      constructor.setSessionAttribute("caldate", date);
    }
    else {
      date = (Date)constructor.getSessionAttribute("caldate");
    }
    if(date == null) date = new Date();
  }
  
  public Date getCurrentDate() {
    // hour and minute to current
    Calendar today = Calendar.getInstance(locale);
    Calendar cal = Calendar.getInstance(locale);
    cal.setTime(date);
    cal.set(Calendar.HOUR_OF_DAY, today.get(Calendar.HOUR_OF_DAY));
    cal.set(Calendar.MINUTE, today.get(Calendar.MINUTE));
    cal.set(Calendar.SECOND, 0);
    return date;
  }
  
  public void setDayRenderer(IDayRenderer dayRenderer) {
    this.dayRenderer = dayRenderer;
  }
  
  public void renderMonth() {
    Calendar cal = Calendar.getInstance(locale);
    cal.setTime(date);
    int day = cal.get(Calendar.DAY_OF_MONTH),
        month = cal.get(Calendar.MONTH),
        year = cal.get(Calendar.YEAR);
    renderMonthTitle();
    startTag("table", new String[] {
      "cellspacing=1",
      "cellpadding=0",
      "class='wcalendar'"
    });
    startTag("thead");
    startTag("tr");
    startTag("td", "class='week'");
    endTag();
    for(int i = 0; i < 7; i++) {
      startTag("td");
      write(dayNames[i]);
      endTag();
    }
    endTag();
    endTag();
    startTag("tbody");
    CalendarUtil.positionFirstCell(cal);
    while(true) {
      startTag("tr");
      startTag("td", "class='week'");
      startAnchor(
              "?calweek=" + cal.get(Calendar.WEEK_OF_YEAR),
              "",
              "daymonth"
              );
      write("" + cal.get(Calendar.WEEK_OF_YEAR));
      endTag();
      endTag();
      for(int i = 0; i < 7; i++) {
        if(cal.get(Calendar.MONTH) == month) {
          if(cal.get(Calendar.DAY_OF_MONTH) == day) {
            startTag("td", "class='selected'");
          }
          else {
            startTag("td", "class='inmonth'");
          }
        }
        else {
          startTag("td", "class='outmonth'");
        }
        startAnchor(
                "?caldate=" + ObjectString.formatObject(cal.getTime(), ObjectString.COMPRESSED_DATE_PATTERN, false),
                "",
                "daymonth"
                );
        write("" + cal.get(Calendar.DAY_OF_MONTH));
        endTag();
        if(dayRenderer != null) dayRenderer.renderDay(cal.getTime(), this);
        cal.add(Calendar.DAY_OF_MONTH, 1);
      }
      endTag();
      if(cal.get(Calendar.MONTH) > month || cal.get(Calendar.YEAR) > year) break;
    }    
    endAllTags();
    startTag("div", "class='wcalfooter'");
    renderToday();
    renderPreviousMonth();
    renderNextMonth();
    endTag();
  }
  
  private void renderToday() {
    startAnchor(
            "?caldate=" + ObjectString.formatObject(new Date(), ObjectString.COMPRESSED_DATE_PATTERN, false),
            ""
            );
    write(I_.get("Today"));
    endTag();
  }
 
  private void renderPreviousMonth() {
    Calendar cal = Calendar.getInstance(locale);
    cal.setTime(date);
    cal.add(Calendar.MONTH, -1);
    startAnchor(
            "?caldate=" + ObjectString.formatObject(cal.getTime(), ObjectString.COMPRESSED_DATE_PATTERN, false),
            ""
            );
    startTag("span", "class='previous'");
    write(monthNames[cal.get(Calendar.MONTH)]);
    endTag();
    endTag();
  }
 
  private void renderNextMonth() {
    Calendar cal = Calendar.getInstance(locale);
    cal.setTime(date);
    cal.add(Calendar.MONTH, 1);
    startAnchor(
            "?caldate=" + ObjectString.formatObject(cal.getTime(), ObjectString.COMPRESSED_DATE_PATTERN, false),
            ""
            );
    startTag("span", "class='next'");
    write(monthNames[cal.get(Calendar.MONTH)]);
    endTag();
    endTag();
  }
 
  private void renderMonthTitle() {
    Localizer localizer = constructor.getLocalizer();
    startTag("div", "class='wcaltitle'");
    write(localizer.parseValue("date", "month_year", date));
    endTag();
  }
}