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A JavaFX Script Calendar that Displays a Google Calendar Feed

03.19.2008
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Today I'd like to show you the humble beginnings of a JavaFX Script calendar that displays a Google Calendar feed.  It is currently pointing to my Google Calendar, which I've sparsely populated with some sample data.  You can change the program to point to your Google Calendar if you choose. 

I'll improve this Calendar program over time, but wanted to demonstrate JavaFX Script's ability to easily parse an XML stream over the Internet.  You may also want to take a look at the Compiled JavaFX Script Now Speaks JSON post which demonstrates parsing JSON streams over the Internet.  Here's a screenshot of today's example, followed by the program's code:

Calendarjfx


The Code Behind the User Interface

Obviously there are many improvements that I can make to this calendar, but here are the four source files that comprise this example in its current state:


CalendarJFX.fx

/*
* CalendarJFX.fx -
* The main program for a compiled JavaFX calendar program
*
* Developed 2008 by James L. Weaver (jim.weaver at lat-inc.com)
* to serve as a compiled JavaFX Script example.
*/

import javafx.ui.*;
import javafx.ui.canvas.*;
import java.lang.System;

Frame {
var calModel =
CalendarModel {}
title: "CalendarJFX"
width: 600
height: 600
visible: true
content:
BorderPanel {
top:
BorderPanel {
left:
FlowPanel {
content: [
Button {
text: "<<"
action:
function():Void {
calModel.prevYear();
}
},
Button {
text: "<"
action:
function():Void {
calModel.prevMonth();
}
}
]
}
center:
FlowPanel {
content:
SimpleLabel {
text: bind "{calModel.selectedMonthStr} {calModel.selectedYearStr}"
font:
Font {
size: 24
style: FontStyle.BOLD
}
}
}
right:
FlowPanel {
content: [
Button {
text: ">"
action:
function():Void {
calModel.nextMonth();
}
},
Button {
text: ">>"
action:
function():Void {
calModel.nextYear();
}
}
]
}
bottom:
GridPanel {
// TODO: Internationalize days of the week
var days = ["Sun", "Mon", "Tue",
"Wed", "Thu", "Fri", "Sat"]
rows: 1
columns: 7
cells:
for (day in days) {
SimpleLabel {
text: day
font:
Font {
size: 18
style: FontStyle.BOLD
}
horizontalAlignment:
HorizontalAlignment.CENTER
}
}
}
}
center:
GridPanel {
vgap: 1
hgap: 1
rows: 6
columns: 7
cells:
for (idx in [1..42]) {
CalendarCell {
calModel: calModel
dayOfMonthStr: bind calModel.getDayInMonthStrForCell(idx as Integer);
cellGregCal: bind calModel.getDateForCell(idx as Integer);
}
}
}
}
onClose:
function():Void {
System.exit(0);
}
}

 
CalendarCell.fx

/*
* CalendarJFX.fx -
* The main program for a compiled JavaFX calendar program
*
* Developed 2008 by James L. Weaver (jim.weaver at lat-inc.com)
* to serve as a compiled JavaFX Script example.
*/

import javafx.ui.*;
import javafx.ui.canvas.*;
import java.lang.System;

Frame {
var calModel =
CalendarModel {}
title: "CalendarJFX"
width: 600
height: 600
visible: true
content:
BorderPanel {
top:
BorderPanel {
left:
FlowPanel {
content: [
Button {
text: "<<"
action:
function():Void {
calModel.prevYear();
}
},
Button {
text: "<"
action:
function():Void {
calModel.prevMonth();
}
}
]
}
center:
FlowPanel {
content:
SimpleLabel {
text: bind "{calModel.selectedMonthStr} {calModel.selectedYearStr}"
font:
Font {
size: 24
style: FontStyle.BOLD
}
}
}
right:
FlowPanel {
content: [
Button {
text: ">"
action:
function():Void {
calModel.nextMonth();
}
},
Button {
text: ">>"
action:
function():Void {
calModel.nextYear();
}
}
]
}
bottom:
GridPanel {
// TODO: Internationalize days of the week
var days = ["Sun", "Mon", "Tue",
"Wed", "Thu", "Fri", "Sat"]
rows: 1
columns: 7
cells:
for (day in days) {
SimpleLabel {
text: day
font:
Font {
size: 18
style: FontStyle.BOLD
}
horizontalAlignment:
HorizontalAlignment.CENTER
}
}
}
}
center:
GridPanel {
vgap: 1
hgap: 1
rows: 6
columns: 7
cells:
for (idx in [1..42]) {
CalendarCell {
calModel: calModel
dayOfMonthStr: bind calModel.getDayInMonthStrForCell(idx as Integer);
cellGregCal: bind calModel.getDateForCell(idx as Integer);
}
}
}
}
onClose:
function():Void {
System.exit(0);
}
}



CalendarModel.fx

/*
* CalendarModel.fx -
* The model behind a compiled JavaFX calendar program
*
* Developed 2008 by James L. Weaver (jim.weaver at lat-inc.com)
* to serve as a compiled JavaFX Script example.
*/

import javafx.xml.*;
import java.text.SimpleDateFormat;
import java.lang.System;
import java.util.Calendar;
import java.util.GregorianCalendar;

class CalendarModel {
attribute calendarFeedURI =
"http://www.google.com/calendar/feeds/james.l.weaver%40gmail.com/public/full";
attribute docBuilder =
DocumentBuilder {
namespaceAware:true
validating:true
ignoringComments:false
};
attribute document =
docBuilder.parseURI(calendarFeedURI);
attribute calEntries:CalendarEntry[];
attribute selectedGregCal:GregorianCalendar = new GregorianCalendar();
attribute utilGregCal:GregorianCalendar = new GregorianCalendar();
attribute selectedMonth:Integer;
attribute selectedYear:Integer;
attribute dayInMonthFmt = new SimpleDateFormat("d");
attribute monthFmt = new SimpleDateFormat("MMMM");
attribute yearFmt = new SimpleDateFormat("yyyy");
attribute cellNumber:Integer;
attribute selectedDayInMonthStr:String;
attribute selectedMonthStr:String;
attribute selectedYearStr:String;

postinit {
var calElements = document.getElementsByTagName("entry");
calEntries = for (calElement in calElements)
CalendarEntry {
title: calElement.queryString("title")
startTimeStr: calElement.queryString("when/@startTime")
endTimeStr: calElement.queryString("when/@endTime")
location: calElement.queryString("where/@valueString")
};
populateDateParts();
}

function prevMonth():Void {
selectedGregCal.add(Calendar.MONTH, -1);
selectedMonth = selectedGregCal.get(Calendar.MONTH);
populateDateParts();
}

function nextMonth():Void {
selectedGregCal.add(Calendar.MONTH, 1);
selectedMonth = selectedGregCal.get(Calendar.MONTH);
populateDateParts();
}

function prevYear():Void {
selectedGregCal.add(Calendar.YEAR, -1);
selectedYear = selectedGregCal.get(Calendar.YEAR);
populateDateParts();
}

function nextYear():Void {
selectedGregCal.add(Calendar.YEAR, 1);
selectedYear = selectedGregCal.get(Calendar.YEAR);
populateDateParts();
}

function populateDateParts():Void {
var selDate = selectedGregCal.getTime();
selectedDayInMonthStr = dayInMonthFmt.format(selDate);
selectedMonthStr = monthFmt.format(selDate);
selectedYearStr = yearFmt.format(selDate);
}

function getDateForCell(cellNumber:Integer):GregorianCalendar {
utilGregCal.set(Calendar.YEAR, selectedYear);
utilGregCal.set(Calendar.MONTH, selectedMonth);
utilGregCal.set(Calendar.DAY_OF_MONTH, 1);
var firstDayOffset = utilGregCal.get(Calendar.DAY_OF_WEEK);
utilGregCal.add(Calendar.DAY_OF_MONTH, firstDayOffset * -1 + cellNumber);
return utilGregCal;
}

function getDayInMonthStrForCell(cellNumber:Integer):String {
utilGregCal.set(Calendar.YEAR, selectedYear);
utilGregCal.set(Calendar.MONTH, selectedMonth);
utilGregCal.set(Calendar.DAY_OF_MONTH, 1);
var firstDayOffset = utilGregCal.get(Calendar.DAY_OF_WEEK);
utilGregCal.add(Calendar.DAY_OF_MONTH, firstDayOffset * -1 + cellNumber);
dayInMonthFmt.format(utilGregCal.getTime());
}
}



CalendarEntry.fx

/*
* CalendarEntry.fx -
* A calendar entry, which is part of the model.
*
* Developed 2008 by James L. Weaver (jim.weaver at lat-inc.com)
* to serve as a compiled JavaFX Script example.
*/

import java.lang.System;
import java.text.SimpleDateFormat;
import java.util.Locale;
import java.util.Calendar;
import java.util.Date;

class CalendarEntry {
private attribute sdf = new SimpleDateFormat
("yyyy-MM-dd'T'HH:mm:ss.SSSZ");
attribute title:String;
attribute startTime:Calendar;
attribute endTime:Calendar;
attribute startTimeStr:String on replace {
//TODO: Accommodate all-day events
var d:Date = sdf.parse("{startTimeStr.substring(0, 26)}{startTimeStr.substring(27)}");
var cal:Calendar = Calendar.getInstance();
cal.setTime(d);
startTime = cal;
};
attribute endTimeStr:String on replace {
var d:Date = sdf.parse("{endTimeStr.substring(0, 26)}{endTimeStr.substring(27)}");
var cal:Calendar = Calendar.getInstance();
cal.setTime(d);
endTime = cal;
};
attribute location:String;
}

 

Enjoy, and as always, please post a comment if you have any questions.

Regards,
Jim Weaver
JavaFX Script: Dynamic Java Scripting for Rich Internet/Client-side Applications

Immediate eBook (PDF) download available at the book's Apress site

Published at DZone with permission of its author, Jim Weaver.

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