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From Apache Wiki <wikidi...@apache.org>
Subject [Cocoon Wiki] Update of "CocoonCFormsXULUIProject" by AntonioGallardo
Date Wed, 27 Jul 2005 04:07:58 GMT
Dear Wiki user,

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The following page has been changed by AntonioGallardo:
http://wiki.apache.org/cocoon/CocoonCFormsXULUIProject

The comment on the change is:
Initial format of proposal

------------------------------------------------------------------------------
  
  The project mentors are [AntonioGallardo] and [JoergHeinicke].
  
+ = Project Title =
+ 
+ XUL Based User Interface for Apache Cocoon Forms
+ 
+ = Synopsis =
+ 
+ Create a new user interface rendering for cforms using Mozilla XUL, The user interface should
be easily switchable HTML-XUL depending on the client browser.
+ 
+ = Background/Motivation =
+ 
+ Apache Cocoon is a Web application development framework built around the concepts of XML
processing pipelines and component-based application development, it takes Model-View-Controller
distinctions and adds an emphasis on Separation of Concerns (SoC), which makes it like the
"web glue" that hooks together components into pipelines and allows parallel evolution of
all aspects of a web application, hence improves development pace and reduces the chance of
conflicts. The project was started in 1999 and has since then grown both in features and user
base, and now is a top-level project of the Apache Software Foundation, and has been widely
used by a lot of people and organizations around the world for developing mission-critical
web applications.
+  
+ Cocoon Forms, or simply referred to as CForms, is Cocoon's advanced XML form framework.
Combined with the powerful Flow mechanisms which use the Continuations programming paradigm,
and the JXTemplate generator, CForms is potentially revolutionary for web application developers,
allowing highly interactive applications that run in a standard browser to be developed with
unusual speed. CForms is still under development, the developers are working towards its first
stable release.	
+ 
+ Mozilla XUL(XML User Interface Language) is one component of the Mozilla application development
suite, currently being used to develop the integrated Mozilla application, like the Firefox
browser, the Thunderbird e-mail client, and so on. The architecture depends upon a core library
XPCOM (cross platform COM), with applications developed using XUL to define user interfaces
and JavaScript to control application flow.
+ 
+ Currently CForms only renders HTML-based user interface, with the surging popularity of
XUL-supported web browser Firefox, and the increasing interests on developing rich client
applications which build upon a well designed framework with lightweight XML and JavaScript
so that new application functionality can be quickly developed and deployed, there is strong
need to add XUL support to CForms, thus extend the GUI features and functionalities of CForms
and provide a solid basis for creating more interactive rich client applications.
+ 
+ The purpose of this project is therefore to build a set of form widgets, XML styling files,
flow control scripts and pipeline code to enable CForms "XUL-aware" and provide transparent
XUL support for CForms, also allow CForms developers to easily manage the GUI rendering, and
be able to choose between HTML and XML based user interfaces depending on different client
browers.
+      	
+ = Project Description =
+ 
+ The project is divided into three parts, each part deals with one aspect of the Model, View
and Controller aspects of CForms respectively to enable XUL support. Specifically:
+ 
+ == Part 1 Model ==
+ 
+ In CForms, the form model is defined by a form definition which is an XML file describing
the structure of the form widgets it consists of. A form instance, which will hold actual
form data, can be created based on the form definition. Although the user interfaces are defined
in XML within XUL framework, the separation between model and view - that is, between the
data to be processed and the physical controls on screen to manipulate the data - is not as
clearly defined as in CForms. So the Form class in CForms need to be extended to extract the
form widgets from XUL files, and be able to hold the form state info from a Request object
for every XUL form fields.
+ 
+ == Part 2 View ==
+ 
+ The view of a form in CForms is handled by a form template which is a XML file specifying
where the form widgets to appear by inserting special tags referencing that widget. The form
template is processed by a publishing pipleline, which will go through Forms Template Transformer,
XSLT, and HTML Serializer, to render plain HTML. Compared to HTML forms, XUL has no equivalent
to the <FORM> tag. XUL form control equivalents are not bound into groups (except via
<radiogroup>). There is no equivalent to <INPUT TYPE="reset"> or <INPUT TYPE="submit">
in XUL. So to expand the Publishing pipeline to generate XUL forms, we need to update the
form XSL files to accommodate the XML representations of XUL widgets, as well as to add new
tranformers to handle special XUL widget stylings.
+ 
+ == Part 3 Controller ==
+ 
+ Since XUL has no semiautomatic form submission process, if a plain XUL document is presented
to the user, then nothing happens to the data entered by the user. This means that if a XUL
application is to behave like an HTML form, then form submission scripts need to be added
to each XUL form. So we need to implement XUL form submission functionality in Form class
of CForms. The technique we choose to handle XUL form submission is to use XMLHttpRequest
object, which allows HTTP requests to be submitted directly from JavaScript. The HTTP request
can be submitted synchronously or asynchronously.
+ 
+ Synchronous submission means that the script halts until the full response is received.
Asynchronous submission is a "fire and forget" system, except that progress can be tracked,
and the final result can be recalled. We choose asynchronous submission in our implementation.
After the form is submitted, the controller will let the form instance object process the
request, so that all widgets can read their value from the request.
+ 
+ Finally, we'll design and implement a GUIManager module to integrate with the publishing
pipeline to handle form user interface issues, depending on different client browsers, the
GUIManager should be able to choose between HTML and XML based user interfaces and render
the interface accordingly.
+ 
+ = Deliverables =
+ 
+ 	code: one module for XUL Form model, one XUL widget styling file, one XUL widget transformer,
+               one module for XUL form submission, one module for GUIManager. 
+ 	technical paper: one paper to describe the technical details of the project.
+ 	tutorial: one tutorial to demonstrate how to use the XUL related modules.
+ 
+ = Project Schedule =
+ 
+ 	06/15/05 - 06/25/05: warm up, get ready on technical side, waiting for the approval of
proposal
+         06/26/05 - 07/09/05: XUL form model
+ 	07/10/05 - 07/16/05: XUL widget stying
+         07/17/05 - 07/23/05: XUL widget transformer
+ 	07/24/05 - 08/06/05: XUL form submission
+ 	08/07/05 - 08/20/05: GUIManager
+ 	08/21/05 - 08/31/05: Wrap up, paper and tutorial	
+ 
+ = Participants =
+ 
+         Developer: He Huang, University of Southern California
+                    email: heh@usc.edu
+         Mentor:    Antonio Gallardo, Apache Cocoon team
+ 	           email: antonio@apache.org
+ 
+ = Bio =
+ 
+ 	He Huang is a Computer Science graduate student in the University of Southern California.
His main interests 
+ include web-based application development and distributed computing. From year 2001 to 2004
he worked for Oracle 
+ Corporation as a software engineer, help developed core modules in a web-based automatic
release update system for 
+ Oracle E-Business application suite. He received M.S. degree in Computer Science from University
of Southern California
+ in 2000, and B.S. degree in Applied Mathematics from Shanghai Jiao-tong University, China
in 1999.
+ 
+ = References =
+ 
+ 	Apache Cocoon project: http://cocoon.apache.org/2.1/index.html
+ 	Apache Cocoon Forms:   http://cocoon.apache.org/2.1/userdocs/forms/
+ 	Creating Applications with Mozilla: http://books.mozdev.org/index.html
+ 	Rapid Application Development with Mozilla: http://mb.eschew.org/
+ 

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