package com.gwt.ui.client;
import java.util.Date;
import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.dom.client.HasChangeHandlers;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.Event;
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.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;
public class CalendarWidget extends Composite implements ClickHandler, HasChangeHandlers {
private class NavBar extends Composite implements ClickHandler {
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;
initWidget(bar);
bar.setStyleName("navbar");
title.setStyleName("header");
HorizontalPanel prevButtons = new HorizontalPanel();
prevButtons.add(prevMonth);
prevButtons.add(prevYear);
HorizontalPanel nextButtons = new HorizontalPanel();
nextButtons.add(nextYear);
nextButtons.add(nextMonth);
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%");
}
@Override
public void onClick(ClickEvent event) {
if (event.getSource() == prevMonth) {
calendar.prevMonth();
} else if (event.getSource() == prevYear) {
calendar.prevYear();
} else if (event.getSource() == nextYear) {
calendar.nextYear();
} else if (event.getSource() == 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", "F\u00e9vrier", "Mars", "Avril", "Mai", "Juin", "Juillet", "Aout", "Septembre", "Octobre", "Novembre", "D\u00e9cembre"
};
public CalendarWidget() {
initWidget(outer);
grid.setStyleName("table");
grid.setCellSpacing(0);
outer.add(navbar, DockPanel.NORTH);
outer.add(grid, DockPanel.CENTER);
drawCalendar();
setStyleName("CalendarWidget");
sinkEvents(Event.ONCHANGE);
}
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.addClickHandler(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 addChangeListener(ChangeListener listener) {
if (changeListeners == null)
changeListeners = new ChangeListenerCollection();
changeListeners.add(listener);
}
public void removeChangeListener(ChangeListener listener) {
if (changeListeners != null)
changeListeners.remove(listener);
}
@Override
public void onClick(ClickEvent event) {
CellHTML cell = (CellHTML)event.getSource();
setDate(getYear(), getMonth(), cell.getDay());
drawCalendar();
if (changeListeners != null) {
changeListeners.fireChange(this);
}
}
@Override
public HandlerRegistration addChangeHandler(ChangeHandler handler) {
return addDomHandler(handler, ChangeEvent.getType());
}
}