Subversion Repositories eFlore/Archives.cel-v1

package org.tela_botanica.client;

import java.util.Date;

import com.google.gwt.user.client.DOM;

import com.google.gwt.user.client.Element;

import com.google.gwt.user.client.ui.Button;

import com.google.gwt.user.client.ui.ChangeListener;

import com.google.gwt.user.client.ui.ChangeListenerCollection;

import com.google.gwt.user.client.ui.ClickListener;

import com.google.gwt.user.client.ui.Composite;

import com.google.gwt.user.client.ui.DockPanel;

import com.google.gwt.user.client.ui.Grid;

import com.google.gwt.user.client.ui.HTML;

import com.google.gwt.user.client.ui.HasAlignment;

import com.google.gwt.user.client.ui.HorizontalPanel;

import com.google.gwt.user.client.ui.SourcesChangeEvents;

import com.google.gwt.user.client.ui.Widget;

public class CalendarWidget extends Composite

    implements ClickListener, SourcesChangeEvents {

  private class NavBar extends Composite implements ClickListener {

    public final DockPanel bar = new DockPanel();

    public final Button prevMonth = new Button("<", this);

    public final Button prevYear = new Button("<<", this);

    public final Button nextYear = new Button(">>", this);

    public final Button nextMonth = new Button(">", this);

    public final HTML title = new HTML();

    private final CalendarWidget calendar;

    public NavBar(CalendarWidget calendar) {

      this.calendar = calendar;

      setWidget(bar);

      bar.setStyleName("navbar");

      title.setStyleName("header");

      HorizontalPanel prevButtons = new HorizontalPanel();

      prevButtons.add(prevYear);

      prevButtons.add(prevMonth);

      HorizontalPanel nextButtons = new HorizontalPanel();

      nextButtons.add(nextMonth);

      nextButtons.add(nextYear);

      bar.add(prevButtons, DockPanel.WEST);

      bar.setCellHorizontalAlignment(prevButtons, DockPanel.ALIGN_LEFT);

      bar.add(nextButtons, DockPanel.EAST);

      bar.setCellHorizontalAlignment(nextButtons, DockPanel.ALIGN_RIGHT);

      bar.add(title, DockPanel.CENTER);

      bar.setVerticalAlignment(DockPanel.ALIGN_MIDDLE);

      bar.setCellHorizontalAlignment(title, HasAlignment.ALIGN_CENTER);

      bar.setCellVerticalAlignment(title, HasAlignment.ALIGN_MIDDLE);

      bar.setCellWidth(title, "100%");

    }

    public void onClick(Widget sender) {

      if (sender == prevMonth) {

        calendar.prevMonth();

      } else if (sender == prevYear) {

        calendar.prevYear();

      } else if (sender == nextYear) {

        calendar.nextYear();

      } else if (sender == nextMonth) {

        calendar.nextMonth();

      }

    }

  }

  private static class CellHTML extends HTML {

    private int day;

    public CellHTML(String text, int day) {

      super(text);

      this.day = day;

    }

    public int getDay() {

      return day;

    }

  }

  private final NavBar navbar = new NavBar(this);

  private final DockPanel outer = new DockPanel();

  private final Grid grid = new Grid(6, 7) {

    public boolean clearCell(int row, int column) {

      boolean retValue = super.clearCell(row, column);

      Element td = getCellFormatter().getElement(row, column);

      DOM.setInnerHTML(td, "");

      return retValue;

    }

  };

  private Date date = new Date();

  private ChangeListenerCollection changeListeners;

  private String[] days = new String[] { "Dimanche", "Lundi", "Mardi",

      "Mercredi", "Jeudi", "Vendredi", "Samedi" };

  private String[] months = new String[] { "Janvier", "Fevrier", "Mars",

      "Avril", "Mai", "Juin", "Juillet", "Aout", "Septembre", "Octobre",

      "Novembre", "Decembre" };

  public CalendarWidget() {

    setWidget(outer);

    grid.setStyleName("table");

    grid.setCellSpacing(0);

    outer.add(navbar, DockPanel.NORTH);

    outer.add(grid, DockPanel.CENTER);

    drawCalendar();

    setStyleName("CalendarWidget");

  }

  private void drawCalendar() {

    int year = getYear();

    int month = getMonth();

    int day = getDay();

    setHeaderText(year, month);

    grid.getRowFormatter().setStyleName(0, "weekheader");

    for (int i = 0; i < days.length; i++) {

      grid.getCellFormatter().setStyleName(0, i, "days");

      grid.setText(0, i, days[i].substring(0, 3));

    }

    Date now = new Date();

    int sameDay = now.getDate();

    int today = (now.getMonth() == month && now.getYear()+1900 == year) ? sameDay : 0;

    int firstDay = new Date(year - 1900, month, 1).getDay();

    int numOfDays = getDaysInMonth(year, month);

    int j = 0;

    for (int i = 1; i < 6; i++) {

      for (int k = 0; k < 7; k++, j++) {

        int displayNum = (j - firstDay + 1);

        if (j < firstDay || displayNum > numOfDays) {

          grid.getCellFormatter().setStyleName(i, k, "empty");

          grid.setHTML(i, k, " ");

        } else {

          HTML html = new CellHTML(

            "<span>" + String.valueOf(displayNum) + "</span>",

            displayNum);

          html.addClickListener(this);

          grid.getCellFormatter().setStyleName(i, k, "cell");

          if (displayNum == today) {

            grid.getCellFormatter().addStyleName(i, k, "today");

          } else if (displayNum == sameDay) {

            grid.getCellFormatter().addStyleName(i, k, "day");

          }

          grid.setWidget(i, k, html);

        }

      }

    }

  }

  protected void setHeaderText(int year, int month) {

    navbar.title.setText(months[month] + ", " + year);

  }

  private int getDaysInMonth(int year, int month) {

    switch (month) {

      case 1:

        if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)

          return 29; // leap year

        else

          return 28;

      case 3:

        return 30;

      case 5:

        return 30;

      case 8:

        return 30;

      case 10:

        return 30;

      default:

        return 31;

    }

  }

  public void prevMonth() {

    int month = getMonth() - 1;

    if (month < 0) {

      setDate(getYear() - 1, 11, getDay());

    } else {

      setMonth(month);

    }

    drawCalendar();

  }

  public void nextMonth() {

    int month = getMonth() + 1;

    if (month > 11) {

      setDate(getYear() + 1, 0, getDay());

    } else {

      setMonth(month);

    }

    drawCalendar();

  }

  public void prevYear() {

    setYear(getYear() - 1);

    drawCalendar();

  }

  public void nextYear() {

    setYear(getYear() + 1);

    drawCalendar();

  }

  private void setDate(int year, int month, int day) {

    date = new Date(year - 1900, month, day);

  }

  private void setYear(int year) {

    date.setYear(year - 1900);

  }

  private void setMonth(int month) {

    date.setMonth(month);

  }

  public int getYear() {

    return 1900 + date.getYear();

  }

  public int getMonth() {

    return date.getMonth();

  }

  public int getDay() {

    return date.getDate();

  }

  public Date getDate() {

    return date;

  }

  public void onClick(Widget sender) {

    CellHTML cell = (CellHTML)sender;

    setDate(getYear(), getMonth(), cell.getDay());

    drawCalendar();

    if (changeListeners != null) {

      changeListeners.fireChange(this);

    }

  }

  public void addChangeListener(ChangeListener listener) {

    if (changeListeners == null)

      changeListeners = new ChangeListenerCollection();

    changeListeners.add(listener);

  }

  public void removeChangeListener(ChangeListener listener) {

    if (changeListeners != null)

      changeListeners.remove(listener);

  }

}