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<title>Wt Release notes</title>
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<body>
<h1>Wt Release notes</h1>
This file lists important notes on migrating existing applications to
newer version of Wt. It lists changes in the library that may break
the way you build Wt, the way you configure Wt or the Wt API and
behaviour.
<h2>Release 3.2.1 (March 16, 2012)</h2>
<p>
This release contains mostly bug and feature improvements.
</p>
<h3>A) New classes:</h3>
<dl>
<dt>
<a href="classWt_1_1WFormModel.html">WFormModel</a>
</dt>
<dd>
A model class for forms. These models are used in Wt::Auth as the
basis for RegistrationModel and AuthModel, and allow a more
straight-forward customization of the underlying behavior of these
forms.
</dd>
<dt>
<a href="classWt_1_1WReadOnlyProxyModel.html">WReadOnlyProxyModel</a>
</dt>
<dd>
A proxy model class which allows to share a source model
read-only between multiple sessions.
</dd>
<dt>
<a href="classWt_1_1WTemplateFormView.html">WTemplateFormView</a>
</dt>
<dd>
A WTemplate-based standard view implementation that works in conjunction
with WFormModel.
</dd>
<dt>
<a href="classWt_1_1Auth_1_1AuthModel.html">Auth::AuthModel</a>
</dt>
<dd>
A model that implements authentication logic.
</dd>
<dt>
<a href="classWt_1_1Auth_1_1FacebookService.html">Auth::FacebookService</a>
</dt>
<dd>
An OAuth-2.0 based authentication service implementation for
Facebook.
</dd>
<dt>
<a href="namespaceWt_1_1Utils.html">Wt::Utils</a>
</dt>
<dd>
This namespace contains a number of utility functions that we
found useful in projects using Wt. They relate mostly to
lower-level encoding and decoding functions: base64-, hex-, html-,
and url-encoding/decoding.
</dd>
</dl>
<h3>B) Main improvements:</h3>
<dl>
<dt>
<a href="classWt_1_1WApplication.html">WApplication</a>
</dt>
<dd>
A new method, WApplication::bind(), is useful in combination with
WServer::post() to avoid posting to a method of a deleted object,
leveraging the same life-time tracking as with signal connections.
</dd>
<dt>
<a href="namespaceWt_1_1Render.html">Render library</a>
</dt>
<dd>
A large number of performance improvements, especially for table
layout and rendering.
</dd>
<dt>
<a href="classWt_1_1Chart_1_1WAxis.html">Chart::WAxis</a>
</dt>
<dd>
DateScale and DateTimeScale axes have improved auto-configuration of
limits and timesteps, now taking into account the resolution.
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1Transaction.html">Dbo::Transaction</a>
</dt>
<dd>
We've modified the default transaction outcome: a transaction will
now automatically commit(), unless the transaction is being
destroyed (goes out of scope) because an exception is being
thrown, in which case the transaction will rollback(). Previously,
an uncomitted transaction would always rollback() on destruction.
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1ptr.html">Dbo::ptr</a>
</dt>
<dd>
Added a session() method, returning the session with which the
session has been associated.
</dd>
<dt>
Shipped SHA-1 implementation.
</dt>
<dd>
We now ship a SHA-1 implementation with Wt and this thus relaxes
the need for OpenSSL to implement WebSockets and
Auth::SHA1HashFunction.
</dd>
</dl>
<h3>C) Non-backwards compatible changes</h3>
<dl>
<dt>
<a href="classWt_1_1WTextEdit.html">WTextEdit</a>
</dt>
<dd>
Due to backwards incompatiblity of IE9, we now require the latest
version of TinyMCE (3.5b1 or later).
</dd>
<dt>
<a href="classWt_1_1Auth_1_1AuthWidget.html">Auth::AuthWidget</a>
</dt>
<dd>
A number of API methods that configure and access the configuration
were moved to the new Auth::AuthModel class which can be accessed from
the widget using model().
</dd>
<dt>
<a href="classWt_1_1Auth_1_1AbstractPasswordService_1_1AbstractStrengthValidator.html">Auth::AbstractPasswordService::AbstractStrengthValidator</a>
</dt>
<dd>
The API was simplified to be less unorthodox: validate() now
returns a Result that contains all the information for it.
</dd>
<dt>
<a href="classWt_1_1Http_1_1Client.html">Http::Client</a>
</dt>
<dd>
We've changed the signature of the parseUrl() utility function to
parse the URL into a URL structure instead of a collection of
string parameters.
</dd>
</dl>
<hr>
<h2>Release 3.2.0 (November 29, 2011)</h2>
<p>
This release contains a number of new modules, as well as the usual
batch of <a href="http://redmine.emweb.be/versions/show/13">bug
fixes</a> and small feature improvements.
</p>
<p>
In this release we also change the WValidator API in a way that it
is likely to break existing applications.
</p>
<h3>A) New namespaces:</h3>
<dl>
<dt>
<a href="group__json.html">Wt::Json (JSON handling)</a>
</dt>
<dd>
This namespace contains classes (Object, Value, Array) which map
the JSON types in C++. It also contains a parser to deserialize
JSON. A writer to serialize to JSON hasn't been added yet.
</dd>
<dt>
<a href="group__mail.html">Wt::Mail (SMTP protocol)</a>
</dt>
<dd>
This namespace contains a Client to send mail messages. It is
currently offering only limited functionality w.r.t. SMTP protocol
handling, but contains enough functionality to send standards
compliant plain-text/HTML mails, with full support for unicode.
</dd>
<dt>
<a href="group__auth.html">Wt::Auth (Authentication)</a>
</dt>
<dd>
<div>This namespace contains model and view classes for
authentication. It implements password authentication using best
practices, email verifiation, remember-me tokens, and provisions
support for federated login with an implementation of OAuth 2.0
for authentication using third party identity providers.</div>
<div>We expect that the API may still evolve, especially with
respect to OAuth 2.0 (which is a draft protocol), and its use
for OpenID Connect, which is the main use case for OAuth within
the authentication module.</div>
</dd>
</dl>
<h3>B) New classes:</h3>
<dl>
<dt>
<a href="classWt_1_1WException.html">WException</a>
</dt>
<dd>
We have cleaned up the use of exceptions within Wt. We have
converted numerous cases where an exception used to be thrown to
error logging, if the exception was thrown to indicate an API
problem. When the API problem is not resulting in a corrupt state,
we now log the error instead of terminating the session. All other
cases now use an exception that implements WException. This does
not affect situations where a std::exception was advertised in the
API.
</dd>
<dt>
<a href="classWt_1_1WIOService.html">WIOService</a>
</dt>
<dd>
<div>
Previously, boost::asio was used only in the built-in httpd as a
portable asynchronous I/O reactor implementation. We have now
moved this into the Wt library itself, where it is now used
instead of a dedicated thread pool for dispatching requests (and
other server events), and where it is also used for asynchronous
I/O by e.g. the Http::Client.
</div>
<div>
The WIOService specializes a boost::asio::service, and integrates
the thread pool that runs the service.
</div>
</dd>
<dt>
<a href="classWt_1_1WStringStream.html">WStringStream</a>
</dt>
<dd>
This is a utility class that we have used since long in Wt. It is
a more efficient replacement for std::stringstream, with mostly a
compatible API (at least for our purposes). For our purposes it is
typically a factor of two or more faster.
</dd>
<dt>
<a href="classWt_1_1Http_1_1Client.html">Http::Client</a>,
<a href="classWt_1_1Http_1_1Message.html">Http::Message</a>
</dt>
<dd>
<div>We have added an implementation of a Http(s) client. The client
is intended for consuming web services in Wt, and handles GET or
POST requests. It is not suitable (yet) for large responses, since
it buffers the entire response internally.</div>
<div>The client uses asynchronous I/O, using the WIOService that is
found in the current WServer instance.</div>
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1backend_1_1Firebird.html">Dbo::Firebird</a>
</dt>
<dd>
<div>Lukasz Matuszewski contributed a Firebird backend
implementation, thanks !</div>
</dd>
</dl>
<h3>C) Main improvements:</h3>
<dl>
<dt>
<a href="classWt_1_1WAbstractItemView.html">WAbstractItemView</a>
</dt>
<dd>
Added a setHeaderWordWrap() method which configures header text
word wrapping, and changed setHeaderAlignemnt() so that it now
allows to change both the horizontal and vertical alignment. This
replaces the previously interwoven API for both features using the
multiLine parameter in setHeaderHeight(), which has been
deprecated. The rendering of the header items has been
reimplemented, simplified, and cleaned up in the process, avoiding
rendering problems on IE browsers.
</dd>
<dt>
<a href="classWt_1_1WApplication.html">WApplication</a>
</dt>
<dd>
Two new methods, deferRendering() and resumeRendering() can be
used to defer the rendering phase in response to the current
event-loop request. This is useful for situations where you are
waiting for an asynchronous operation to complete, but want to
handle this synchronously in the user-interface (i.e. blocking the
interface until the operation completes). While this is not a good
idea in general, it may be useful if you can guarantee that the
event will arrive within an acceptible time (e.g. 1 second). This
effectively stalls the response to the current request, but avoids
blocking threads in the process.
</dd>
<dt>
<a href="classWt_1_1WDialog.html">WDialog</a>
</dt>
<dd>
Added setClosable(), which adds a close icon into the title bar.
</dd>
<dt>
<a href="classWt_1_1WFormWidget.html">WFormWidget</a>
</dt>
<dd>
We have cleaned up the use of exceptions within Wt. We have
converted numerous cases where an exception used to be thrown to
error logging, if the exception was thrown to indicate an API
problem. When the API problem is not resulting in a corrupt state,
we now log the error instead of terminating the session. All other
cases now use an exception that implements WException. This does
not affect situations where a std::exception was advertised in the
API.
</dd>
<dt>
<a href="classWt_1_1WLogger.html">WLogger</a>
</dt>
<dd>
<div>
We have reorganized the logging within Wt. Internally, a number
of macros are now used for logging, with as default
implementation our own (simple) logger, but which can be
redefined to use instead another logging framework of your
choice, as some have rightfully requested.
</div>
<div>
But we've also improved our logger so that it now can be
configured to filter only certain information, based on type and
scope. This is mostly useful for debuggin and development of Wt
itself, since it allows us to switch on debugging output, in a
fine-grained way, in a debug build.
</div>
<div>Finally, a new global function has been added (Wt::log()) which
selects an appropriate logger for logging and is more convenient
than WApplication::log() which required an application instance.
</div>
</dd>
<dt>
<a href="classWt_1_1WTemplate.html">WTemplate</a>
</dt>
<dd>
<div>Arguments to bound functions are now parsed and passed to
the resolveString() methods.</div>
<div>Two new constructs have been added: conditions and
functions. Conditions allow certain parts of a template to be
skipped or included based on a bound condition. Functions are
useful to automatically resolve certain variables, two built-in
functions are implemented: one to resolve strings in a message
resource bundle ("tr"), and another to resolve the id of a bound
widget ("id").
</div>
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1collection.html">Dbo::collection&lt;T&gt;</a>
</dt>
<dd>
We've added front() methods that return the first element.
</dd>
<dt>
Built-in httpd connector
</dt>
<dd>
We have expanded the WebSockets implementation to cover newer
versions of the WebSockets protocol (draft): next to 00, we now
also support 07, 08 and 13 protocols (with draft-17 semantics).
</dd>
<dt>
Configuration
</dt>
<dd>
On UNIX-like platforms, and using the built-in httpd connector,
SIGHUP is caught in the WServer::waitForShutdown() utility function,
and the configuration file (wt_config.xml) is reread.
</dd>
<dt>
Several security improvements
</dt>
<dd>
<dl>
<dt>DoS mitigation</dt>
<dd>We have added two measures to prevent DoS attacks that try
to exhaust the server by spawning sessions. This is in
particular a risk when deploying using the progressive bootstrap
method, since then a plain HTML session can be spawned with a
single request.
<ul>
<li>Plain sessions may be limited to constitute only a
fraction of the total number of sessions. This is configured
using the &lt;plain-ajax-sessions-ratio-limit&gt;
configuration option.</li>
<li>Ajax sessions need to confirm their "intelligence" by
solving a puzzle which requires them to properly parse the
(ever-changing) JavaScript and HTML.</li>
</ul>
</dd>
<dt>Compromised session ID risk reduction</dt>
<dd>
A compromised session ID no longer can be used to hijack that
session.
<ul>
<li>A full page refresh (using the session ID to rerender
the current application state) is no longer allowed unless
both client IP address and user-agent are unchanged. To
still enable page refresh in this situation, you may
configure the use of a cookie which can be used to confirm
the original browser (although that cookie will not be
used for session tracking), using the
&lt;session-id-cookie&gt; setting.</li>
<li>
The session ID cannot be used to POST events to an Ajax
session, since these require proof of other ever-changing
context specific information, notably a pageId and ackId.
</li>
</ul>
</dd>
</dl>
</dd>
</dl>
<h3>D) Non-backwards compatible changes</h3>
<dl>
<dt>
Build options
</dt>
<dd>The HTTP_WITH_SSL option has been removed, and is now replaced
by WT_WITH_SSL -- OpenSSL is now a dependency of Wt inherited by
the httpd.
</dd>
<dt>
<a href="classWt_1_1WValidator.html">WValidator</a>
</dt>
<dd>
We broke the validate() method, to return a new WValidator::Result
instead of WValidator::State. The main improvement is that the
validation may also return a text which contains information on
why validation failed. This makes the API consistent with the
client-side API, and obviously much more useful. It will break
existing application that call validate() or have reimplemented
validate() in a custom validation class.
</dd>
<dt>
<a href="classWt_1_1Test_1_1WTestEnvironment.html">WTestEnvironment</a>
</dt>
<dd>
This class has moved to a pseudo-connector library
(libwttest). This was needed to be able to use asynchronous I/O
(such as Http::Client) in test cases, which rely on a WIOService
fournished by a WServer instance.
</dd>
</dl>
<hr>
<h2>Release 3.1.11 (September 23, 2011)</h2>
<p>
This release
contains <a href="http://redmine.emweb.be/versions/show/12">many
bug fixes</a> and a few new features.
</p>
<h3>A) New classes:</h3>
<dl>
<dt>
<a href="classWt_1_1WLink.html">WLink</a>
</dt>
<dd>
This class unifies the different link types used in Wt, in a
single value class. Depending on the context, a link may refer to
a URL, a resource, or an internal path. We've updated the API
throughout to replace the function overloads for these different
cases with a single usage of WLink, simplifying the API (but don't
worry, we left the old methods, albeit depricated).
</dd>
<dt>
<a href="classWt_1_1WMediaPlayer.html">WMediaPlayer</a>
</dt>
<dd>
A media player has been added which provides a unified framework
for playing audio and video, and which deals with cross-browser
issues (chosing a suitable implementation per browser). We've also
renamed WHTML5Audio, WHTML5Video, and WHTML5Media to WAudio,
WVideo and WAbstractMedia respectively (since well, everything
will eventually be HTML5, no ?).
</dd>
</dl>
<h3>B) Main improvements:</h3>
<dl>
<dt>
<a href="classWt_1_1WResource.html">WResource</a>,
<a href="classWt_1_1Http_1_1ResponseContinuation.html">Http::ResponseContinuation</a>
</dt>
<dd>
Currently, you can already stream the output of a big resource in
little chunks, using a continuation to resume sending the next
part. We've now added API methods
(WResourceContinuation::waitForMoreData() and
WResource::haveMoreData()) to allow a resource to suspend its
response because it is currently lacking more data, to continue
later when new data is available (and without tying up a thread).
</dd>
<dt>
<a href="classWt_1_1WDialog.html">WDialog</a>
</dt>
<dd>
Added an option setResizable() which puts a resize handle in the
bottom right corner.
</dd>
<dt>
<a href="classWt_1_1WPopupMenu.html">WPopupMenu</a>,
<a href="classWt_1_1WPopupMenuItem.html">WPopupMenuItem</a>
</dt>
<dd>
Added a triggered() signal, and an option to automatically cancel
the popup menu when the mouse leaves the menu (after a
delay). We've also added the possibility to link a popup menu item
with a WLink, and the option to make the item which has a submenu
item also itself selectable.
</dd>
<dt>
Dbo::Session
</dt>
<dd>
The load() method has an additional, optional parameter, to force
rereading the copy from the database.
</dd>
<dt>
Dbo::collection&lt;C&gt;
</dt>
<dd>
Added a count() method which uses a query to determine whether the
collection contains an element.
</dd>
<dt>
Test::WTestEnvironment
</dt>
<dd>
Added dialogExecuted() and popupExecuted() methods which allow to
interact with a reentrant eventloop from a test plan.
</dd>
</dl>
<h3>C) Non-backwards compatible changes</h3>
The item data roles InternalPathRole and UrlRole have been removed,
and replaced by a LinkRole (which contains a WLink value instead).
<h3>D) Deprecated API</h3>
With the introduction of WLink, the following API is being deprecated
(although it can be argued that some of these may be kept for
convenience):
<ul>
<li>
WAbstractArea::setRef(): use WAbstractArea::setLink() instead.
</li>
<li>
WAbstractArea::ref(): use WAbstractArea::link() instead.
</li>
<li>
WAbstractArea::setResource(): use WAbstractArea::setLink() instead.
</li>
<li>
WAbstractArea::resource(): use WAbstractArea::link() instead.
</li>
<li>
WAnchor::setRef(): use WAnchor::setLink() instead.
</li>
<li>
WAnchor::ref(): use WAnchor::link() instead.
</li>
<li>
WAnchor::setResource(): use WAnchor::setLink() instead.
</li>
<li>
WAnchor::resource(): use WAnchor::link() instead.
</li>
<li>
WAnchor::setRefInternalPath(): use WAnchor::setLink() instead.
</li>
<li>
WImage::setImageRef(): use WImage::setImageLink() instead.
</li>
<li>
WImage::imageRef(): use WImage::imageLink() instead.
</li>
<li>
WImage::setResource(): use WImage::setLink() instead.
</li>
<li>
WImage::resource(): use WImage::link() instead.
</li>
<li>
WStandardItem::setInternalPath(): use WStandardItem::setLink() instead.
</li>
<li>
WStandardItem::internalPath(): use WStandardItem::link() instead.
</li>
<li>
WStandardItem::setUrl(): use WStandardItem::setLink() instead.
</li>
<li>
WStandardItem::url(): use WStandardItem::link() instead.
</li>
</ul>
The following classes have been renamed, and the old name is being
deprecated:
<ul>
<li>
WHTMLMedia is now WAbstractMedia.
</li>
<li>
WHTMLVideo is now WVideo
</li>
<li>
WHTMLAudio is now WAudio
</li>
</ul>
<hr>
<h2>Release 3.1.10 (July 8, 2011)</h2>
<p>
This release contains a mix of new features and bug fixes
</p>
<h3>A) New classes:</h3>
<dl>
<dt>
<a href="classWt_1_1WAnimation.html">WAnimation</a>
</dt>
<dd>
We have added support for animations to show or hide widgets (used
in <a href="classWt_1_1WWidget.html#a66bdda41220267a8c7ff9865996e2675">WWidget::setHidden()</a>,
and <a href="classWt_1_1WStackedWidget.html">WStackedWidget</a>). These
animations will only be used when the browser supports CSS3
animations (at the moment of writing that includes latest Firefox,
Chrome and Safari releases).
</dd>
<dt>
<a href="classWt_1_1WStreamResource.html">WStreamResource</a>
</dt>
<dd>
Dmitriy Igrishin factored this out of the WFileResource since most
of its functionality (continuations, range support) could be
generalized to streaming from a std::istream.
</dd>
</dl>
<h3>B) Main improvements:</h3>
<dl>
<dt>
Allowing multiple WServer instances.
</dt>
<dd>
Apparently for no good reasons at all, some singletons were still
around which prevented you from instantiating
multiple <a href="classWt_1_1WServer">application servers</a>. Now
you can (but only using the built-in httpd) instantiate multiple
servers side by side in the same process, which may server the
same or different web applications over different ports. A feature
example (<tt>multiple_servers</tt>) shows how that works.
</dd>
<dt>
Internal path encoding in WTemplate and WText</a>
</dt>
<dd>
<div>
The
new <a href="classWt_1_1WTemplate.html#aeee888e560c519ac0e33bfc1ebb315e2">setInternalPathEncoding()</a>
method will, if needed, enable reencoding of &lt;a&gt; anchors
which reference internal paths consistent with how in the
current session internal paths need to be dealt with (which
depends on whether the browser supports Ajax and HTML5 History).
</div>
<div>
Since this requires an additional XML parsing step (but the
rapidxml parser that is used is ... rapid !), it is off by
default.
</div>
</dd>
<dt>
<a href="classWt_1_1WWApplication.html">WApplication::findWidget()</a>
</dt>
<dd>
Like WWidget::findWidget(), but on the whole application,
including widgets outside the WApplication::root().
</dd>
<dt>
<a href="classWt_1_1WWApplication.html">WApplication::changeSessionId()</a>
</dt>
<dd>
Generates a new session ID for the application. This is useful to prevent
session fixation attacks by changing the session ID when a user has
authenticated successfully.
</dd>
<dt>
<a href="classWt_1_1WResource.html">WResource::setDispositionType()</a>
</dt>
<dd>
This method allows to specify how the browser should preferably
show a (non-HTML) resource.
</dd>
<dt>
<a href="classWt_1_1WTable.html">WTable</a>
</dt>
<dd>
Methods were added
to <a href="classWt_1_1WTable.html#a239d85781509ff321eb964af042bcf57">move
a row</a>
or <a href="classWt_1_1WTable.html#a0670b90a05a6c0176c773bf8766a5bf2">a
column</a>. In addition we added methods
to <a href="classWt_1_1WTableRow.html">WTableRow</a>
and <a href="classWt_1_1WTableColumn.html">WTableColumn</a> for
accessing cells in the given row or column.
</dd>
<dt>
<a href="classWt_1_1WTextEdit.html">WTextEdit</a>
</dt>
<dd>
Various improvements to allow more flexible access to TinyMCE
settings on a per-instance basis.
</dd>
<dt>
<a href="classWt_1_1WWidget.html">WWidget::setToolTip()</a>
</dt>
<dd>
An additional argument was added which may specify the use of
XHTML tooltips, which are implemented using a &lt;div&gt;.
</dd>
<dt>
Dbo::collection&lt;T&gt;
</dt>
<dd>
Make insert() and erase() also work for a collection involved in a
1-N relation
</dd>
<dt>
Dbo::ptr&lt;C&gt;
</dt>
<dd>
Improved modify() behaviour returns a proxy object which marks the
the object dirty also from its destructor, avoiding situations where
the transaction is flushed during a modification and remainig changes
are forgotten.
</dd>
<dt>
Dbo::Dbo&lt;C&gt;
</dt>
<dd>
Added setDirty() and self() methods.
</dd>
<dt>
Dbo::backend::Sqlite3
</dt>
<dd>
The packaged sqlite3 version was bumped from 3.6.20 to 3.7.6
</dd>
</dl>
<h3>C) Non-backwwards compatible changes</h3>
<dl>
<dt>The signature of the virtual method WWidget::setHidden() has changed.</dt>
<dd>
Probably the biggest breaking change since long, this was needed
to add support for animations. This will break existing code which
specializes the WWidget::setHidden() method. This code should be
updated to pass the WAnimation object.
</dd>
</dl>
<hr>
<h2>Release 3.1.9 (April 7, 2011)</h2>
<p>
This release contains mostly bug fixes and quality improvements.
</p>
<h3>A) New classes:</h3>
<dl>
<dt>
<a href="classWt_1_1WAbstractSpinBox.html">WAbstractSpinBox</a>,
<a href="classWt_1_1WDoubleSpinBox.html">WDoubleSpinBox</a>
</dt>
<dd>
Refactored and reimplemented the spinbox control into an integer
and floating point version, which may be implemented either using
a native HTML5 element or a portable Wt implementation.
</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
<dl>
<dt>
Internal path handling: HTML5 History API
</dt>
<dd>
<div>
When the browser supports the HTML5 History API, URLs are now the
same for plain HTML and Ajax-enabled session (i.e. without the '#'
trick). This can improve load time and improves the
user-experience.
</div>
<div>
To avoid problems of resolving resources with relative URLs, a
new property 'baseURL' can be used (that can be configured in
wt_config.xml), which allows all relative URLs be resolved from
the same location.
</div>
</dd>
<dt>
Internal path handling: no ugly internal paths ('?_=/path')
</dt>
<dd>
The configuration option (--docroot) for the built-in
httpd allows to specify folders with static paths and when doing
so, all other requests are forwarded to the application, which in
turn does no longer need to rely on the ugly '?_=' query parameter
to encode its internal paths.
</dd>
<dt>
<a href="classWt_1_1WPdfImage.html">WPdfImage</a>, <a href="classWt_1_1WRasterImage.html">WRasterImage</a>
</dt>
<dd>
Improved font support: the library can be optionally built to use
libpango for resolving characters to glyphs. This allows text to
be rendered using a mix of different fonts that all provide only
partial coverage for the entire unicode range. Note that for
WPdfImage, this currently requires use of a libharu fork
(https://github.com/kdeforche/libharu/tree/)
</dd>
<dt>
<a href="classWt_1_1WAbstractItemView.html">WAbstractItemView</a>,
WTableView and WTreeView
</dt>
<dd>
Implementation of setRowHeaderCount() which fixes the number of
columns that are used as row headers and remain fixed while
scrolling horiziontally through the table. This replaces the now
deprecated setColumn1Fixed() API.
</dd>
<dt>
<a href="classWt_1_1WRasterImage.html">WRasterImage</a>
</dt>
<dd>
Several quality improvements: correct rendering of alpha
compositing, text rendering by libpango,
</dd>
<dt>
<a href="classWt_1_1WSlider.html">WSlider</a>
</dt>
<dd>
The slider has been reimplemented to allow for using either the
native HTML5 slider control, or the Wt implementation. The Wt
implementation can now also be styled through CSS.
</dd>
<dt>
<a href="classWt_1_1WServer.html#abca6890dab44d87bd3af64705ac072d3">WRun()</a>,
<a href="classWt_1_1WServer.html#a84f84652ccb139850adcf5ea75f50fa5">WServer::addEntryPoint()</a>
</dt>
<dd>
The callback function is now a boost::function<> object, allowing
you to bind other variables into the callback function.
</dd>
<dt>
<a href="classWt_1_1WServer.html#a2894484a9661d728dc9aa60ba79bb570">WServer::post()</a>
</dt>
<dd>
A safe method to post events to a session, and a useful
alternative to WApplication::UpdateLock. The simplechat and
codeview examples were converted to illustrate this method rather
than the (dead-lock prone) WApplication::UpdateLock approach.
</dd>
<dt>
<a href="classWt_1_1WString.html#abcff7d3d30972762bd5d9279dc903a36">WString::trn()</a>
</dt>
<dd>
Implementation of plural string resolution, with locale-dependent
rules. The implementation provided
by <a href="classWt_1_1WMessageResourceBundle.html">WMessageResourceBundle</a>
allows the same kind of expressions as GNU ngettext().
</dd>
<dt>
<a href="classWt_1_1Chart_1_1WAxis.html#ab36cb584a0aa8bdcc1c3212a9304e6cd">Chart::WAxis::setResolution()</a>
</dt>
<dd>
Allows to specify the minimum chart axis resolution (contributed by Gaetano Mendola).
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1Transaction.html">Dbo::Transaction</a>
</dt>
<dd>
Fixed an issue with internal inconsistencies after transaction rollback.
</dd>
</dl>
<h3>C) Non-backwwards compatible changes</h3>
<dl>
<dt>Changed i18n keys for <tt>Wt.WDate.Mon-Sun</tt>
and <tt>Wt.Date.Jan-Dec</tt></dt>
<dd>
We were pointed out the fact that the built-in i18n keys for WDate
month names had a collision for the month 'May', which had the
same key for the abbreviated 3-letter variant as the full length
variant. Therefore in this release we reformatted the abbreviated
3-letter variant keys to <tt>Wt.WDate.3.Mon-Sun</tt>
and <tt>Wt.WDate.3.Jan-Dec</tt>. You will need to update your own
languages copies of these (or better, contribute them and we'll
maintain them for you!).
</dd>
</dl>
<h3>D) Android and iPad/iPhone targets</h3>
<p>This release contains initial work on supporting Android and
iPad/iPhone as targets for deploying Wt applications within a webkit
view widget.</p>
<p>For iPad/iPhone, we added a script that builds Wt as an OSX Framework
which may be used in XCode to build iOS applications.</p>
<p>For Android, we added support for building the library and examples as
shared objects which are packaged together with a small Java project
which instantiates a WebView, into standalone APK files.</p>
<p>This is ongoing work. We need to improve support in Wt for Mobile
Webkit to make the applications look and behave more as native
applications on these devices.</p>
<hr>
<h2>Release 3.1.8 (Feb 4, 2011)</h2>
<p>
This release contains mostly bug fixes, quality improvements,
and a few new features.
</p>
<h3>A) New classes:</h3>
<dl>
<dt><a href="classWt_1_1WFontMetrics.html">WFontMetrics</a></dt>
<dd>
A font metrics class. Font metrics are only available for
WPdfImage, and an implementation is planned for WRasterImage.
</dd>
<dt><a href="classWt_1_1Render_1_1WTextRenderer.html">Render::WTextRenderer</a>,
<a href="classWt_1_1Render_1_1WPdfRenderer.html">Render::WPdfRenderer</a></dt>
<dd>
A renderer class for a subset of XHTML, useful for e.g.~generatig
PDF reports.
</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
<dl>
<dt>
<a href="classWt_1_1WAbstractItemView.html#ad11215811b4de66f3d3c4267b694fe38">WAbstractItemView::setHeaderItemDelegate()</a>
</dt>
<dd>
Rendering of header cells is now also delegated and can be customized.
</dd>
<dt>
<a href="classWt_1_1WAbstractItemView.html#a027a8ad4967a0e269bdabbffca15f489">WAbstractItemView::scrollTo()</a>
</dt>
<dd>
Scroll to a particular item.
</dd>
<dt>
<a href="classWt_1_1WApplication.html#a44c5f0398b5539269be3961b26e95b08">WApplication::setLayoutDirection()</a>
</dt>
<dd>
Added support for Right-To-Left (mirrored) layouts, typically used
with some middle-Eastern languages. In addition to HTML's built-in
support for RTL directionality, layout managers, tables and MVC
tree/table views render their columns in the opposite order.
</dd>
<dt>
<a href="classWt_1_1WBoxLayout.html">WBoxLayout, WGridLayout, WBorderLayout</a>
</dt>
<dd>
Empty layout items do longer create padding, and thus padding
collapses around empty items (both horizontally and vertically).
</dd>
<dt>
<a href="classWt_1_1WEvent.html">WEvent::eventType()</a>
</dt>
<dd>
Information on the event type may be used during WApplication::notify()
for e.g. detecting user activity.
</dd>
<dt>
<a href="classWt_1_1WGoogleMap.html">WGoogleMap</a>
</dt>
<dd>
Added support for Google API version 3, alongside version 2.
</dd>
<dt>
<a href="classWt_1_1WPdfImage.html">WPdfImage</a>
</dt>
<dd>
Added support true type font loading, a UTF8 patch for libharu is
pending to enable full unicode support text rendering.
</dd>
<dt>
<a href="classWt_1_1WWidget.html#afc4bfcc92fa39010cac8775f3332dfa5">WWidget::setWidth()</a>,
<a href="classWt_1_1WWidget.html#a7d82ee32496743fdd28b30461f95d5ec">WWidget::setHeight()</a>
</dt>
<dd>
Convenience methods for resize() for only width or height.
</dd>
<dt>
<a href="classWt_1_1Chart_1_1WCartesianChart.html">Chart::WCartesianChart</a>
</dt>
<dd>
A number of methods to customize the location and look of the legend.
</dd>
<dt>
<a href="classWt_1_1Chart_1_1WDataSeries.html#a9361e12e94699f59090ae8ac3a4921df">Chart::WDataSeries::setXSeriesColumn()</a>
</dt>
<dd>
Allow use of a specific X series for each data series in scatter plots.
</dd>
<dt>
<a href="group__dbo.html#ga0f2f0c37d44f27e151b8f12412240731">Dbo::belongsTo()</a>, <a href="group__dbo.html#ga0d0cbc70dcfebc659ea1662e9327c90c">Dbo::hasMany()</a>
</dt>
<dd>
Support for foreign key constraints (NotNull, OnDeleteCascade, etc...).
</dd>
<dt>
<a href="group__dbo.html#ga0f2f0c37d44f27e151b8f12412240731">Dbo::Session::rereadAll()</a>
</dt>
<dd>
Can be optionally given a single table name to reread (discard) all object
data from a single class/table.
</dd>
<dt>
<a href="structWt_1_1Dbo_1_1sql__value__traits.html">Dbo::sql_value_traits&lt;bool&gt;, Dbo::sql_value_traits&lt;long&gt;</a>
</dt>
<dd>
Added mappings for C++ <tt>bool</tt> and <tt>long</tt> types.
</dd>
</dl>
<h3>C) API and other changes:</h3>
<dl>
<dt>
CORS (Cross-Origin Resource Sharing)
</dt>
<dd>
A communication method between browser and server is now chosen
based on the needs (same origin or cross-origin), and based on
browser support. Cross-Origin requests are now supported for both
Ajax and WebSockets, and are are chosen if available and needed,
reverting to dynamic script-tags otherwise.<br/>
The WApplication::setAjaxMethod() has no effect anymore, and has
been deprecated.
</dd>
<dt>
Bootstrap process has changed.
</dt>
<dd>
While tracking bootstrapping problems on IE8 (resulting in a blank
page instead of a shiny app), we not only found a good workaround
for that, but also found a way to implement the default bootstrap
mode so that the stylesheets are applied before the application is
rendered. This solves the annoying flicker you experienced with
the default bootstrap mode, and also allows us to remove a number
of workarounds for IE. As a result of various cleanups, more CSS
stylesheet rules have been pushed out to the external wt.css
(theme) stylesheet. If you've created your own theme, you will
need to take note.
</dd>
<dt>
<a href="group__painting.html#gaf67a889bc5e9f8ab3a59fe58b0fa2128">Wt::BrushStyle</a>
</dt>
<dd>
Wt::WBrushstyle has been renamed to Wt::BrushStyle. This makes it
consistent with the naming conventions of other enums. Sorry, our
mistake !
</dd>
</dl>
<hr />
<h2>Release 3.1.7 (Nov 26, 2010)</h2>
<p>
This release contains mostly bug fixes, quality improvements,
and a few new features.
</p>
<p>
Note: the package was updated (3.1.7a) on Nov 30 to fix a layouting
regression.
</p>
<h3>A) New classes:</h3>
<dl>
<dt><a href="classWt_1_1WGLWidget.html">WGLWidget</a></dt>
<dd>
A preview of WebGL support in Wt (work in progress).
</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
<dl>
<dt>
<a href="classWt_1_1WAbstractItemView.html#a120156dc59eaf3608916b679d937c5b8">WAbstractItemView</a>
</dt>
<dd>Added API for hiding columns.</dd>
<dt>
<a
href="classWt_1_1Chart_1_1WCartesianChart.html">WCartesianChart</a>,
<a
href="classWt_1_1Chart_1_1WCartesianChart.html">WPieChart</a>
</dt>
<dd>
Added support for ToolTipRole data, using WAbstractArea interactive areas.
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1Session.html#ad59da4e078a4e6532da698425193bbdb">Dbo::Session::rereadAll()</a>
</dt>
<dd>
Reread all transient objects, as a catch-all solution to stale
data (data modified in another session).
</dd>
<dt>
<a href="classWt_1_1WInteractWidget.html#ac7d10a6cae1e23a791b44c0682a3c627">WInteractWidget</a>
</dt>
<dd>Added support for touch and gesture events (Mobile webkit).</dd>
</dl>
<h3>C) Misc:</h3>
<dl>
<dt>
WebSocket protocol support (experimental)
</dt>
<dd>Use of WebSocket for communication between browser and server
can now be used, by enabling &lt;web-sockets&gt; in the
configuration file (we're likely to turn this on by default in a
future version. There is automatic fallback to the current
XMLHttpRequest based communication if WebSockets are not available
or communication could not be established. WebSockets is only
available using the built-in httpd server (which is now also a
WebSocket server).</dd>
<dt>
Build improvements
</dt>
<dd>
<ul>
<li>Provide a workaround for broken g++ compiler shipped in Ubuntu
Maverick</li>
<li>Provide support for building without using
std::wstring (-DWT_NO_STD_WSTRING) or std::locale
(-DWT_NO_STD_LOCALE=OFF) support.
</li>
</ul>
</dd>
</dl>
<hr />
<h2>Release 3.1.6 (Oct 29, 2010)</h2>
<p>
This release contains a healthy mix of bug fixes, quality improvements,
and new features. And hopefully no regressions :-)
</p>
<h3>A) New classes:</h3>
<dl>
<dt><a href="classWt_1_1SyncLock.html">SyncLock&lt;Lock&gt;</a></dt>
<dd>
A dead-lock avoidance adaptor for a Boost mutex lock, which provides
a controlled way of releasing the current application lock.
</dd>
<dt><a href="classWt_1_1WProgressBar.html">WProgressBar</a></dt>
<dd>
A progress bar, contributed by Thomas Suckow.
</dd>
<dt><a href="classWt_1_1WSpinBox.html">WSpinBox</a></dt>
<dd>
A spin box.
</dd>
<dt><a href="structWt_1_1boost__any__traits.html">boost_any_traits&lt;Type&gt;</a></dt>
<dd>
A traits class for customized interpretation of data stored in a
boost::any. You can register a new type using <a href="group__modelview.html#ga91842a84102ee15d41102ccf0745f4e4">registerType&lt;Type&gt;</a>.
</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
<dl>
<dt>
Native support for MSIE 9
</dt>
<dd>
MSIE 9 (Beta) is now supported in all its goodness, including support
for HTML5 canvas and (almost working) support for SVG.
</dd>
<dt>
<a href="classWt_1_1WApplication_1_1UpdateLock.html">
WApplication::UpdateLock</a>
</dt>
<dd>The lock is now a RIAA lock, getUpdateLock() has been deprecated.
The lock needs also to be tested against validity (using operator bool()):
when invalid the session that it is trying to lock is being destroyed.</dd>
<dt>
<a href="classWt_1_1WApplication.html#a506978cfb884af4bc6ffd5a5bc8476d6">WApplication::setConfirmCloseMessage()</a>
</dt>
<dd>Provide the user with a message to confirm navigating away from the
application.</dd>
<dt>
<a href="classWt_1_1WApplication.html#a9a4048e01b69a536e35f47eb2a59a69b">WApplication::unload()</a>
</dt>
<dd>Rather then waiting for the session to expire, an application
that is navigated away iis now notified of this and will by
default <tt>quit()</tt>.</dd>
<dt>
<a href="classWt_1_1WApplication.html#a149412d829d104621c445bc10604be53">WApplication::addMetaHeader()</a>
</dt>
<dd>Can now be used to specify "http-equiv" meta headers too.</dd>
<dt>
<a href="classWt_1_1WDatePicker.html#acda30d9035692895a2bb94090babc073">WDatePicker::changed()</a>
</dt>
<dd>I wonder how we ever did without.
</dd>
<dt><a href="classWt_1_1WAbstractArea.html#a3dbe39c26769a63e4bf63020e31e9f22">WAbstractArea::mouseWheel()</a>,
<a href="classWt_1_1WInteractWidget.html#a656a0e4d5af72af0190d84dedf0093c6">WInteractWidget::mouseWheel()</a>,
<a href="classWt_1_1WMouseEvent.html#a4354738e0bce7e57764a465f5e19895d">WMouseEvent::wheelDelta()</a></dt>
<dd>
Added mouseWheel() event.
</dd>
<dt><a href="classWt_1_1WFileUpload.html">WFileUpload</a></dt>
<dd>
Added support for the simultaneous upload of multiple files (HTML5
"multiple") attribute and showing a progress bar to show upload
progress.
</dd>
<dt><a href="classWt_1_1WFormWidget.html">WFormWidget::hasFocus()</a></dt>
<dd>
Returns whether the widget currently has the keyboard focus.
</dd>
<dt><a href="classWt_1_1WHTML5Media.html">WHTML5Media</a></dt>
<dd>
Added events to catch play, pause, play-back progress and volume
changes.
</dd>
<dt><a href="classWt_1_1WLineEdit.html">WLineEdit</a>, <a href="classWt_1_1WTextArea.html">WTextArea</a></dt>
<dd>
Added <tt>currentPosition()</tt>, <tt>selectionStart()</tt>,
<tt>selectedText()</tt>, and <tt>hasSelectedText()</tt> methods to retrieve
the current cursor position and selection.
</dd>
<dt><a href="classWt_1_1WPushButton.html#aa5830a2118836423f0c16d12bbfd57a0">WPushButton::setRef()</a></dt>
<dd>
Utility method to create an anchor that looks like a button, or a
button that behaves like an anchor, depending on your point of
view. There is also <tt>setResource()</tt> to set a resource as
target.
</dd>
<dt>
<a href="classWt_1_1WResource.html">WResource</a>
</dt>
<dd>Added API for upload progress tracking.</dd>
<dt>
<a href="classWt_1_1Http_1_1Request.html">Http::Request</a>
</dt>
<dd>Added support for HTTP request byte ranges, and this is now
interpreted by both the WFileResource and built-in httpd for static
files.
</dd>
<dt>
<a href="classWt_1_1Http_1_1Response.html">Http::Response</a>
</dt>
<dd>Added <tt>setContentLength()</tt> which allows you to specify the
lenght of the response in advance, proving a better user experience
for large downloads.
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1Session.html#8712ff0d59f7bb6a4d2986ad9637cc9e">Dbo::Session::query()</a>
</dt>
<dd>Switched to a more complete Boost.Spirit parser for SQL queries, which
understands most of the SQL syntax, including functions,
"with ... select ... ".
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1QueryModel.html">Dbo::QueryModel</a>
</dt>
<dd>Added support for custom column header names and changing the
undelrying query using setQuery() while preserving the current
column definitions.</dd>
<dt>
<a href="classWt_1_1Dbo_1_1SqlStatement.html">Dbo::SqlStatement</a>
</dt>
<dd>Added boost::posix_time::time_duration type support.</dd>
<dt>
<a href="structWt_1_1Dbo_1_1sql__value__traits.html">Dbo::sql_value_traits&lt;WTime&gt;</a>
</dt>
<dd>Added template specialization for WTime.</dd>
</dl>
<hr />
<h2>Release 3.1.5 (Sep 10, 2010)</h2>
<p>
This release contains mostly bug fixes.
</p>
<h3>A) Main Changes</h3>
<dl>
<dt><a href="classWt_1_1WGridLayout.html">WGridLayout</a>,
<a href="classWt_1_1WBoxLayout.html">WBoxLayout</a></dt>
<dd>Optimized client-side rendering performance. Previously, every layout
manager used would automatically slowdown every event because it would try
to relayout each time. This is no longer the case.</dd>
<dt><a href="classWt_1_1WSocketNotifier.html">WSocketNotifier</a></dt>
<dd>The socket notifier has been resurrected (it was in an perpetual state
of brokeness) and now works reliably across targets.</dd>
</dl>
<h3>B) Changes that may break existing applications:</h3>
<h4>1) Built-in resource bundles</h4>
Starting with this version, Wt uses an internal message resource
bundle for the few strings it provides by itself (like for example
'Ok' for the ok button in a WMessageBox, or the days-of-week in WDate).
Previously, an ugly API was used in <a href="classWt_1_1WMessageBox.html">WMessageBox</a>,
<a href="classWt_1_1WCalendar.html">WCalendar</a>,
and <a href="classWt_1_1WDatePicker.html">WDatePicker</a>
using a boolean 'i18n' parameter in the constructor. All this has now been removed,
and instead the keys for these built-in strings have been documented. If you were
using these classes your application will no longer build, you can simply remove the
internationalization parameter and you will need to fix the keys you used for the
messages according to the documentation.
Any localized strings you use will take precedence over these built-ins.
All affected classes (only those listed above actually have changed API and behaviour) are:
<dl>
<dt><a href="classWt_1_1WAbstractItemView.html">WAbstractItemView</a></dt>
<dd>the paging tool bar buttons for graceful callback.</dd>
<dt><a href="classWt_1_1WCalendar.html">WCalendar</a></dt>
<dd>because of WDate</dd>
<dt><a href="classWt_1_1WDate.html">WDate</a> and <a href="classWt_1_1WDateTime.html">WDateTime</a></dt>
<dd>week days, month names</dd>
<dt><a href="classWt_1_1WDatePicker.html">WDatePicker</a></dt>
<dd>because of WCalendar and for the close button</dd>
<dt><a href="classWt_1_1WDefaultLoadingIndicator.html">WDefaultLoadingIndicator</a></dt>
<dd>loading text</dd>
<dt><a href="classWt_1_1WInPlaceEdit.html">WInPlaceEdit</a></dt>
<dd>save and cancel button text</dd>
<dt><a href="classWt_1_1WMessageBox.html">WMessageBox</a></dt>
<dd>standard buttons</dd>
<dt><a href="classWt_1_1WOverlayLoadingIndicator.html">WLoadingIndicator</a></dt>
<dd>standard buttons</dd>
<dt><a href="classWt_1_1WValidator.html">Validators</a></dt>
<dd>for the messages they display in case of error</dd>
</dl>
<h4>2) Other behavioural changes</h4>
<dl>
<dt><a href="structWt_1_1WDialog.html">WDialog</a></dt>
<dd>Escape will no longer result in the dialog being rejected. You can
enable this behaviour using the rejectWhenEscaped() method.
</dd>
</dl>
<hr />
<h2>Release 3.1.4 (Aug 13, 2010)</h2>
<p>
This release contains several new features, but also a few changes
that break backwards compatibility (but are unlikely to affect an
average application).
</p>
<h3>A) New classes:</h3>
<dl>
<dt><a href="classWt_1_1WBatchEditProxyModel.html">
WBatchEditProxyModel</a></dt>
<dd>A proxy model that caches editing operations to commit them atomically.
</dd>
<dt><a href="classWt_1_1WHTML5Audio.html">WHTML5Audio</a></dt>
<dd>Audio support using the HTML5 audio tag.</dd>
<dt><a href="classWt_1_1WPdfImage.html">WPdfImage</a></dt>
<dd>A WPaintDevice that writes to Pdf (using libharu).</dd>
<dt><a href="classWt_1_1WRasterImage.html">WRasterImage</a></dt>
<dd>A WPaintDevice that writes to a Png/Gif (using GraphicsMagick).</dd>
<dt>ISAPI connector</dt>
<dd>(Windows only) a connector that implements the Microsoft ISAPI
API, to integrate directly into Microsoft IIS. On Windows, this is
an alternative deployment option next to the built-in httpd.</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
<dl>
<dt>
<a href="classWt_1_1WAbstractItemView.html">WAbstractItemView</a>
</dt>
<dd>Added support for validators while editing.</dd>
<dt>
<a href="classWt_1_1WApplication.html#88b082dadadd3fb7dbe10887e7d89c91">WApplication</a>
</dt>
<dd>Added an appRoot() method this returns the value of the
special property "approot" which can in some cases be defined
implicitly by a connector (such as ISAPI), and which allows an
application to reference working files whereas previously it was
assumed that they were in the working directory (CWD).</dd>
<dt>
<a href="classWt_1_1WEnvironment.html#fd8726dfa8cabcb49895df4a6112ef48">WEnvironment::agent() and related</a>
</dt>
<dd>Convenience methods that return pre-parsed user agent identification,
should you want to differentiate based on browser.</dd>
<dt>
<a href="classWt_1_1WWidget.html#bb5949e98f47edb7db98d7b6df07a31c">WWidget::addStyleClass()</a>, <a href="classWt_1_1WWidget.html#3b8a35e37ef06c408f346c63a5f1aa8e">WWidget::removeStyleClass()</a>
</dt>
<dd>Added addStyleClass() and removeStyleClass() methods.</dd>
<dt>
<a href="classWt_1_1WMenu.html">WMenu, WMenuItem</a>
</dt>
<dd>Added support for closable and disabled items (not complete,
CSS is lacking for polished theme). Contributed by Dmitriy Igrishin.</dd>
<dt>
<a href="classWt_1_1WModelIndex.html#93c11e136a0fdc596eb745cc7fce7033">WModelIndex</a>
</dt>
<dd>Added support for in-place (destructive) encoding to and
decoding from a raw index, making this less of a hassle for View
classes.</dd>
<dt>
<a href="classWt_1_1WSortFilterProxyModel.html">WSortFilterProxyModel</a>
</dt>
<dd>Added support for row insertion/removal.</dd>
<dt>
<a href="classWt_1_1WSuggestionPopup.html">WSuggestionPopup</a>
</dt>
<dd>Allow usage as an advanced combo-box, with an explicit drop down
button and ability to react to a selection.</dd>
<dt>
<a href="group__dbo.html#gc98c1f90b00ed9ce243c6412da3ac489">Dbo::id()</a>
</dt>
<dd>Support for natural keys (possibly of composite type) next to the
built-in surrogate keys.</dd>
<dt>
<a href="structWt_1_1Dbo_1_1dbo__traits.html">Dbo::dbo_traits&lt;C&gt;</a>
</dt>
<dd>By specializing this traits class, you can modify the surrogate id
field name (or disable it), and the optimistic version lock field
name (or disable it).</dd>
<dt>
<a href="classWt_1_1Dbo_1_1Session.html#8712ff0d59f7bb6a4d2986ad9637cc9e">Dbo::Session::query()</a>
</dt>
<dd>More robust query parsing (of the 'select' part), including
support for "select distinct".</dd>
<dt>
<a href="classWt_1_1Dbo_1_1QueryModel.html">Dbo::QueryModel</a>
</dt>
<dd>Added editing support (editing the model will modify the queried
dbo's).</dd>
<dt>
<a href="structWt_1_1Dbo_1_1query__result__traits.html">Dbo::query_result_traits&lt;C&gt;</a>
</dt>
<dd>Added setValue(), create(), add() and remove() methods for modifying
queried results.</dd>
</dl>
<h3>C) Changes that break existing applications:</h3>
<dl>
<dt><a href="structWt_1_1Dbo_1_1Dbo.html">Dbo::Dbo</a></dt>
<dd>
This class is now a templated with the class name itself, in
order to provide the proper type for the (natural or surrogate) id
field for id(). You will need to replace
<pre>
class User : public Wt::Dbo { ... }
</pre>
with
<pre>
class User : public Wt::Dbo&lt;User&gt; { ... }
</pre>
</dd>
<dt>CSS</dt>
<dd>The toplevel container used by Wt is now given a <tt>position:
relative</tt> style; this was needed to be able to position widgets
(such as popups) using <tt>position: absolute</tt>, but may break
application layouts. You can override this CSS style by adding
<tt>.Wt-domRoot { position: static; }</tt> to your application's
(internal or external) stylesheet.
</dd>
</dl>
<hr />
<h2>Release 3.1.3 (May 20, 2010)</h2>
<p>
This release several new features, but also a few changes that
break backwards compatibility (but are unlikely to affect an average
application).
</p>
<h3>A) New classes:</h3>
<dl>
<dt><a href="classWt_1_1SignalBase.html">SignalBase</a>,
<a href="classWt_1_1EventSignalBase.html">EventSignalBase</a></dt>
<dd>Abstract base classes for signals (these are not actually new,
but they were not yet part of the API).</dd>
<dt><a href="classWt_1_1WHTML5Video.html">WHTML5Video</a></dt>
<dd>Video support using the HTML5 video tag (work-in-progress).</dd>
<dt><a href="classWt_1_1Dbo_1_1Call.html">Dbo::Call</a></dt>
<dd>Class for executing a database call.</dd>
<dt><a href="classWt_1_1Dbo_1_1SqlConnectionPool.html">
Dbo::SqlConnectionPool</a>,
<a href="classWt_1_1Dbo_1_1FixedSqlConnectionPool.html">
Dbo::FixedSqlConnectionPool</a></dt>
<dd>Connection pool interface and implementation.</dd>
<dt><a href="classWt_1_1Dbo_1_1QueryModel.html">Dbo::QueryModel</a></dt>
<dd>An tabular item model for query results.</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
<dl>
<dt><a href="classWt_1_1WAbstractItemDelegate.html">WAbstractItemDelegate</a></dt>
<dd>Added methods for editing: editState(), setEditState(),
setModelData() and closeEditor().</dd>
<dt><a href="classWt_1_1WAbstractItemView.html">WAbstractItemView</a></dt>
<dd><div>New editing API: edit(), closeEditor(), saveEditedValue(),
setEditOptions(), setEditTriggers().</div>
<div>Graceful degradation support using a paging navigation bar, which
may be customized by reimplementing createPageNavigationBar().</div>
</dd>
<dt><a href="classWt_1_1WCalendar.html">WCalendar</a>, <a href="classWt_1_1WDatePicker.html">WDatePicker</a></dt>
<dd>Added setBottom() and setTop() methods to specify a valid range.</dd>
<dt><a href="classWt_1_1WInteractWidget.html">WInteractWidget</a></dt>
<dd>Added a mouseDragged() event for responding to mouse moves while
a mouse button is down.</dd>
<dt><a href="classWt_1_1WItemDelegate.html">WItemDelegate</a></dt>
<dd>Implements editing using a WLineEdit.</dd>
<dt><a href="classWt_1_1WMenu.html">WMenu</a></dt>
<dd>Can now be used without a contents stack.</dd>
<dt><a href="classWt_1_1WSuggestionPopup.html">WSuggestionPopup</a></dt>
<dd>Added API to support dynamic server-side filtering.</dd>
<dt><a href="classWt_1_1WTableView.html">WTableView</a></dt>
<dd>New implementation which supports horizontal and vertical
virtual scrolling, column resizing, drag and drop, etc... like
WTreeView.</dd>
<dt><a href="classWt_1_1Chart_1_1WPieChart.html">Chart::WPieChart</a></dt>
<dd>Supports now also a shadow effect.</dd>
<dt><a href="classWt_1_1Dbo_1_1collection.html">Dbo::collection</a></dt>
<dd>A find() method has been added to refine the query of a many-side relational.</dd>
<dt><a href="classWt_1_1Dbo_1_1ptr.html">Dbo::ptr</a></dt>
<dd>A version() method returns the current version.</dd>
<dt><a href="classWt_1_1Dbo_1_1Query.html">Dbo::Query</a></dt>
<dd>An extra template parameter specifies a binding strategy. The
default binding strategy is DynamicBinding, which allows reuse of
the query object, and provides new API to modify the query:
where(), orderBy(), groupBy(), offset(), limit().</dd>
<dt><a href="classWt_1_1Dbo_1_1Session.html">Dbo::Session</a></dt>
<dd>Added support for use with a connection pool. Added execute()
method to execute an SQL statement.</dd>
<dt>Built-in httpd</dt>
<dd>Support for HTTP Range header and partial content servering.</dd>
</dl>
<h3>C) Changes that break existing applications:</h3>
<dl>
<dt><a href="structWt_1_1Dbo_1_1query__result__traits.html">Dbo::sql_result_traits</a></dt>
<dd>This traits class has been renamed to query_result_traits and
its API has changed considerably. This will only impact when you
have implemented a custom traits specialization. The getColumns()
method has been replaced with a getFields() method, and the
loadValues() method has been renamed to load(). A getValues()
method has been added which provides conversion to boost::any's.
</dd>
<dt><a href="classWt_1_1WTableView.html">WTableView</a></dt>
<dd>This View class was reimplemented to have functionality
comparable to WTreeView. In the process, we had to abandon the
underlying &lt;table&gt; representation because of rendering
issues with Chrome (of all browsers!), although the WTableView
documentation specifically promised that we would keep this.
</dd>
</dl>
<hr />
<h2>Release 3.1.2 (March 26, 2010)</h2>
<p>This release contains mostly bug fixes, and a few new features.</p>
<h3>A) New classes:</h3>
<dl>
<dt><a href="classWt_1_1WShadow.html">WShadow</a></dt>
<dd>Class representing a drop shadow effect (see below).</dd>
<dt><a href="classWt_1_1Dbo_1_1backend_1_1Postgres.html">Dbo/backend/Postgres</a></dt>
<dd>A Postgres backend has landed, contributed by Hilary Cheng.</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
<dl>
<dt><a href="classWt_1_1WBoxLayout.html">WBoxLayout</a>, <a href="classWt_1_1WGridLayout.html">WGridLayout</a></dt>
<dd>Addition of horizontal and vertical splitter support (resize handles to
allow the user to adjust the layout), sponsored by Eurofer. The new API
methods are <a href="classWt_1_1WBoxLayout.html#00bdfb4d442bd8e8ad9c33b72692763f">setResizable()</a>, <a href="classWt_1_1WGridLayout.html#180c33a8f9e21a7b58f12e055fdb469e">setColumnResizable()</a> and <a href="classWt_1_1WGridLayout.html#6028853eb5a66d868323d0e034b69390">setRowResizable()</a></dd>
<dt><a href="classWt_1_1WCalendar.html">WCalendar</a></dt>
<dd>Improved the API to allow custom cell rendering, and custom handling
of selection. We have also made the API for selection consistent with other
widgets (like WTreeView), deprecating the old API.</dd>
<dt><a href="classWt_1_1WDateTime.html">WDateTime</a></dt>
<dd>Added <a href="classWt_1_1WDateTime.html#0d7f04bacc6ea6534bc61ec7305a8262">toPosixTime()</a> and <a href="classWt_1_1WDateTime.html#eb5f093554829688b36640f0977da541">fromPosixTime()</a> methods to interoperate with
<tt>boost::posix_time::ptime</tt>.</dd>
<dt><a href="classWt_1_1WFormWidget.html">WFormWidget</a></dt>
<dd>Added a <a href="classWt_1_1WFormWidget.html#92de7a4d9ca6796607dc9fd26f608436">setEmptyText()</a> method to implement a label inside a line edit or text area.</dd>
<dt><a href="classWt_1_1WPainter.html">WPainter</a></dt>
<dd>Added a <a href="classWt_1_1WPainter.html#9c727b82879ab055f3fcf4c9cdfc1f8d">setShadow()</a> method which defines a drop shadow to be used for subsequent
drawing actions.</dd>
<dt><a href="classWt_1_1WResource.html">WResource</a></dt>
<dd>Added a <a href="classWt_1_1WResource.html#06bb9dbe3ae195c320cfed7b062d448a">setInternalPath()</a> method which allow a resource to be deployed at a deterministic and "pretty" URL.</dd>
<dt><a href="classWt_1_1WString.html">WString</a></dt>
<dd>Added constructors that take a std::locale for interpreting a narrow
string in a given locale.</dd>
<dt><a href="classWt_1_1WWidget.html">WWidget</a></dt>
<dd>Added <a href="classWt_1_1WWidget.html#4f83592912a7f8fa4fd35dadde78ee74">setLayoutSizeAware()</a> and <a href="classWt_1_1WWidget.html#f432588db3d599f89b54121f2ede8d63">layoutSizeChanged()</a> methods which allow a widget to react to layout size changes.</dd>
<dt><a href="classWt_1_1Http_1_1Request.html">Http::Request</a></dt>
<dd>Added access to the request <a href="classWt_1_1Http_1_1Request.html#e76664f93462d9311ee671c93607e5ca">method()</a>.</dd>
<dt><a href="classWt_1_1Http_1_1Response.html">Http::Response</a></dt>
<dd>Added a <a href="classWt_1_1Http_1_1Response.html#7c14ba3ab34ff14461df3a4369118443">setStatus()</a> method to modify the response status.</dd>
<dt><a href="classWt_1_1Dbo_1_1Session.html">Dbo::Session</a></dt>
<dd>Added support for schema qualified tables, in
<a href="classWt_1_1Dbo_1_1Session.html#5886d450c052ae0ee15ab3c91e439229">Session::mapClass()</a> and the joinTable specified in <a href="group__dbo.html#g1a086b583fb150dbd4c5b4ba92bc177f">hasMany()</a>.<br />
Added API for dropping the schema: <a href="classWt_1_1Dbo_1_1Session.html#4c1fedb21e4e1cc44b182a34e8ebb4efdropTables()">dropTables()</a>. <br />
Added support for arbitrary queries in <a href="classWt_1_1Dbo_1_1Session.html#d39e953ef521eaa58c4c7e6ca1a6c19e">Session::query()</a>, including
queries that do not return result or do not select from tables.</dd>
<dt><a href="group__dbo.html#g8a2b653ff57f1459dfa2e556badd71d6">Dbo::field()</a></dt>
<dd>Allow size suggestion for std::string and WString mappings</dd>
<dt><a href="classWt_1_1Dbo_1_1SqlConnection.html">Dbo::SqlConnection, Dbo::SqlStatement</a></dt>
<dd>Added support for floating point types, binary data (using std::vector&lt;unsigned char&gt;) and date and date/time types.<br/>
Added methods for return dialect-specific information.<br/>
Added properties API.<br/>
</dd>
<dt><a href="structWt_1_1Dbo_1_1sql__value__traits.html">Dbo::sql_value_traits</a></dt>
<dd>Added support for backend-specific type mapping.</dd>
<dt>(internal) DomElement</dt>
<dd>Performance improvements in serializing the widgets to HTML
and/or JavaScript</dd>
<dt>Built-in httpd</dt>
<dd>Added a configuration option <tt>--max-request-size</tt> to
limit the size of a POST instead of the built-in default of 40
MB<br/> Added a configuration option
<tt>--max-memory-request-size</tt> to limit the size of a POST that
is handed in-memory. Bigger POSTs are handled using a spool file.
</dd>
</dl>
<hr />
<h2>Release 3.1.1 (February 17, 2010)</h2>
<p>The minimum boost version is now 1.36.</p>
<p>This release handles mostly bug fixes, with as most visible change
an update of the <i>polished</i> theme, which is now considered
complete.</p>
<h3>A) Security fixes:</h3>
Because of the following fixes for security problems, we recommend anyone
to upgrade live deployments of his application to the latest version.
<dl>
<dt>Possible XSS vulnerability</dt>
<dd>Fixed a possible XSS attack where a user follows a link to a Wt web
application, taking advantage of unchecked insertions of the URL when
redirecting to the canonical page.</dd>
<dt>Possible UTF-8 vulnerability</dt>
<dd>Form values and JSignal arguments received from the browser are
now checked for sane UTF-8 encoding.</dd>
</dl>
<h3>B) New classes:</h3>
<dl>
<dt><a href="classWt_1_1Dbo_1_1Dbo.html">Dbo/Dbo</a></dt>
<dd>An optional base class for a database object, providing access to its
id() and session().</dd>
</dl>
<h3>C) Main new features in existing classes:</h3>
<dl>
<dt><a href="classWt_1_1WCanvasPaintDevice.html">WCanvasPaintDevice</a></dt>
<dd>Now implements native text rendering on Firefox and latest
Chrome and Safari browsers</dd>
<dt><a href="classWt_1_1WInPlaceEdit.html">WInPlaceEdit</a></dt>
<dd>Added a setEmptyText() method which sets the text to be
displayed when value is empty.</dd>
<dt><a href="classWt_1_1WPopupMenu.html">WPopopMenu</a></dt>
<dd>Added an exec(WWidget *location, Orientation orientation) method which
popups the menu besides another widget.</dd>
<dt><a href="classWt_1_1WSuggestionPopup.html">WSuggestionPopup</a></dt>
<dd>This class is now also style by the CSS theme.</dd>
<dt><a href="classWt_1_1WTemplate.html">WTemplate</a></dt>
<dd>Avoids now rerendering of already bound widgets when the
template is rerendered.</dd>
<dt><a href="classWt_1_1WTree.html">WTree</a>,
<a href="classWt_1_1WTreeNode.html">WTreeNode</a>,
<a href="classWt_1_1WTreeTable.html">WTreeTable</a>,
<a href="classWt_1_1WTreeTableNode.html">WTreeTableNode</a>
</dt>
<dd>These widgets are now theme-aware, and tree decoration styling
is provided by the theme. The setImagePack() APIs are now
no-ops</dd>
<dt><a href="classWt_1_1WWidget.html">WWidget</a></dt>
<dd>Added positionAt() method which positions a widget (absolutely) besides
another widget.</dd>
<dt><a href="classWt_1_1Chart_1_1WAxis.html">Chart/WAxis></a></dt>
<dd>Added a setLabelFont() method.</dd>
<dt><a href="classWt_1_1Http_1_1Request.html">Http/Request</a></dt>
<dd>Added serverName(), serverPort(), path(), pathInfo(),
queryString(), urlScheme(), in(), contentType(), contentLength(),
userAgent() and clientAddress() methods which expose information
form the HTTP request to WResources.</dd>
</dl>
<h3>D) Build changes:</h3>
<dl>
<dt>XML_FEATURES</dt>
<dd>This CMake option has been removed, and Mini-XML has been
replaced by a modified RapidXML xml parser (mostly because of the
hard-to-interpret Mini-XML license), but there are also nice
performance improvements.</dd>
</dl>
<hr />
<h2>Release 3.1.0 (December 29, 2009)</h2>
<p>This release contains several new features and classes, after a long
period of stabilization that happened before the 3.0.0 release.</p>
<h3>A) New classes:</h3>
<dl>
<dt><a href="classWt_1_1WAggregateProxyModel.html">WAggregateProxyModel</a></dt>
<dd>A model that provides support for drilling down through columns, supported
by WTreeView.</dd>
<dt><a href="classWt_1_1WCombinedLocalizedStrings.html">WCombinedLocalizedStrings</a></dt>
<dd>Combines different localized strings implementations.</dd>
<dt><a href="classWt_1_1WDateTime.html">WDateTime</a></dt>
<dd>Combines a calendar date (WDate) and a clock time (WTime).</dd>
<dt><a href="classWt_1_1WTemplate.html">WTemplate</a></dt>
<dd>Use an XHTML fragment as a template, with variables that are place
holders for strings or other widgets. See the blog example of how this
class can be used to simplify HTML/CSS based layout of widgets and
contents.</dd>
<dt><a href="classWt_1_1WTime.html">WTime</a></dt>
<dd>Represents a clock time (0-24 hours).</dd>
<dt><a href="group__dbo.html">Wt::Dbo</a></dt>
<dd>An Object Relational Mapping library. See the <a href="../../tutorial/dbo.html">tutorial here</a>.</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
Most inline CSS styles have been pushed out to an external style
sheet, which may be themed. The "default" theme provides the old look,
while a new "polished" theme provides a less boring (?) look for
several widgets (work in progress). The theme can be set using <a
href="classWt_1_1WApplication.html">WApplication::setCssTheme()</a>.
As a result, you will need to deploy Wt's <tt>"resources/"</tt>
folder, which contains the themes in <tt>"resources/themes/"</tt>, for
all but the most trivial applications.
<dl>
<dt><a href="classWt_1_1Signal.html">Signal</a></dt>
<dd>Added a template connect() method which may be given any function
object, providing also support for the (future) c++1x lambda functions.</dd>
<dt><a href="classWt_1_1WCanvasDevice.html">WCanvasDevice</a></dt>
<dd>Several optimizations to output more concise JavaScript.</dd>
<dt><a href="classWt_1_1WPaintedWidget.html">WPaintedWidget</a></dt>
<dd>When width and/or height is not set using resize(), the widget
will now properly react to layout management when put into a layout
manager, triggering a server-side rerendering when needed.</dd>
<dt><a href="classWt_1_1WSlider.html">WSlider</a></dt>
<dd>A sliderMoved() signal was added which is fired whenever the slider is
moved (but not yet released).</dd>
<dt><a href="classWt_1_1WWidget.html">WWidget</a></dt>
<dd>Added a find() method which searches the widget hierachy for a widget
with a particular objectName().</dd>
<dt><a href="classWt_1_1WServer.html">WServer</a></dt>
<dd>Added an addResource() method to bind static resources to particular
URLs (i.e. resources that are not bound to a specific session).</dd>
<dt><a href="classWt_1_1Ext_1_1Container.html">Ext::Container</a></dt>
<dd>Will now properly react to layout management from a layout that
is set for a WContainerWidget.</dd>
<dt><a href="classWt_1_1Ext_1_1FormField.html">Ext::FormField</a></dt>
<dd>Added changed(), blurred() and focussed() signals.</dd>
<dt><a href="classWt_1_1Chart_1_1WAxis.html">Chart::WAxis</a></dt>
<dd>Added setAutoLimits() and autoLimits() methods to configure which limits
are to be determined based on the data, and which are explicitly set.</dd>
<dt><a href="classWt_1_1Chart_1_1WDataSeries.html">Chart::WDataSeries</a></dt>
<dd>Added the setHidden() and hidden() methods to enable or disable
a data series. Added setBarWidth() and barWidth() methods to set the
width of a bar (useful mostly for scatter plots). Added
setMarkerSize() and markerSize() methos.</dd>
<dt><a
href="classWt_1_1Chart_1_1WCartesianChart.html">Chart::WCartesianChart</a></dt>
<dd>Use MarkerPenColorRole and MarkerBrushColorRole to override
colors for makers on a per data point basis. Added mapFromDevice()
and mapToDevice() methods for mapping device coordinates to chart
coordinates and vice-versa</dd>
</dl>
<h3>C) API Changes:</h3>
<dl>
<dt><a href="classWt_1_1WSlider.html">WSlider</a></dt>
<dd>Not really an API change, but the vertical slider is now showing
the maximum value at its top side, not its bottom side.</dd>
<dt><a href="classWt_1_1Chart_1_1WAxis.html">Chart::WAxis</a></dt>
<dd>The minimum() and maximum() methods will now return the calculated
minimum and maximum value when they are to be automatically calculated based
on the data, configured using setAutoLimits()</dd>
</dl>
<h3>D) Build changes:</h3>
<dl>
<dt>XML_FEATURES</dt>
<dd>A new configuration option, XML_FEATURES, was added which allows the library to be built without MiniXML (and disabling fatures that require Mini-XML support). This configuration option is likely to be removed again in future versions.</dd>
<dt>Documentation</dt>
<dd>A <tt>doc</tt> directive was added, which uses doxygen and asciidoc tools
to generate the reference documentation and tutorial.</dd>
<dt>Tests</dt>
<dd>Automated tests were added for non-interactive functionality,
and are built by default.</dd>
</dl>
<hr />
<h2>Release 3.0.0 (November 3, 2009)</h2>
<p>
This release contains mostly bug fixes, build improvements and
documentation improvements compared to the latest pre-release
(2.99.5).
</p>
<p>
Most build improvements are related to finding the boost
libraries. Previously, Wt used a custom script, since CMake versions
&lt; 2.6 did not provide a good enough script for finding
boost. Starting with this release, when using CMake 2.6 or later, Wt
will use the script that comes with CMake. You can still fall back to
the script that comes with Wt, which is still used for older versions
of CMake, by defining one of the BOOST_COMPILER or BOOST_VERSION
variables.
</p>
<h3>A) New classes:</h3>
<i>No new classes</i>
<h3>B) Main new features in existing classes:</h3>
<dl>
<dt><a href="classWt_1_1WDialog.html">WDialog</a></dt>
<dd>It is now possible to have multiple modal dialogs, and nested
recursive event loops.</dd>
<dt><a href="classWt_1_1WWidget.html#e29fe35b633ec166f922419cd3ca9d96">
WWidget</a></dt>
<dd>The <samp>setDisabled()</samp> method moved up
from <samp>WFormWidget</samp> to <samp>WWidget</samp>.</dd>
<dt><a href="classWt_1_1JSlot.html#3d65b00a8015e556580527b52750ef87">
JSlot</a></dt>
<dd>The <samp>exec()</samp> method now passes object and event to the
JavaScript event handler.</dd>
</dl>
<h3>C) API Changes:</h3>
<dl>
<dt><a href="classWt_1_1WResource.html">WResource</a></dt>
<dd>The handling of changes to the resource has been sanitized. A
new method, <samp>setChanged()</samp> was added which must be called
to notify users of the resource that the resource was changed. In
addition to the existing <samp>generateUrl()</samp> which generates
a new URL, a method was added which merely returns the existing
URL: <samp>url()</samp>. With these improvements, a resource can
effictively be shared by many view widgets and updated with the
minimum of bandwidth usage.</dd>
</dl>
<hr />
<h2>Release 2.99.5 (September 1, 2009)</h2>
<p>
This release contains mostly bug fixes. The previous release (2.99.4)
contains some critical bugs that cause mayhem on IE, and a regression
with server push.
</p>
<hr />
<h2>Release 2.99.4 (August 27, 2009)</h2>
<p style="text-align: center">
<b>!! This release contains bugs that render it unusable on IE !!</b>
</p>
<p>
This release contains mostly bug fixes and back-end improvements. The
most exciting new feature is the addition of a new bootstrap method,
which implements progressive enhancements (starting with a plain HTML
page, and then upgrading it to an AJAX page if the browser has
support), see
also <a href="/wt/doc/reference/html/overview.html#progressive_bootstrap">the
documentation</a>.
</p>
<h3>A) New classes:</h3>
<dl>
<dt><a href="classWt_1_1WTableView.html">WTableView</a></dt>
<dd>This is a simple MVC View class that renders tabular data
in the most straight forward way using an HTML table element
</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
<dl>
<dt><a href="classWt_1_1Ext_1_1ToolBar.html#931b9b3e5d4cbbdee5394a841752c849">Ext::ToolBar</a></dt>
<dd>Added insert() methods.</dd>
<dt><a href="classWt_1_1WApplication.html#78016406c4746c56b2c2ffce7c5e181f">WApplication</a></dt>
<dd>Added an enableAjax() method which notifies the application that
a session is being enhanced with AJAX capabilities when using the
progressive bootstrap method.</dd>
<dt><a href="classWt_1_1WWidget.html#919a4eaf68ff52f06f6a726d55dfb768">WWidget</a></dt>
<dd>Added an enableAjax() method which enhanced the widget with AJAX
capabilities when using the progressive bootstrap method.</dd>
<dt><a href="classWt_1_WCssDecorationStyle.html">WCssDecorationStyle</a></dt>
<dd>Add support for custom cursors.</dd>
<dt><a href="classWt_1_WWServer.html">WServer</a></dt>
<dd>For FastCGI deployments, the proxy process which directs FastCGI
requests to the correct session process is now also
multi-threaded.</dd>
</dl>
<h3>C) API Changes:</h3>
<dl>
<dt>The <a href="classWt_1_1WApplication.html#4a6f167bea94aefa8ba24f914c2fbee5">WApplication::notify()</a> behavior changed.</dt>
<dd>Previously during a request, this method was called multiple
times during event propagation and rendering of the
application. Now, the method is called exactly once for each
request. In this way, it becomes a useful entry point to also manage
resource usage during (and inbetween) requests.</dd>
</dl>
<hr />
<h2>Release 2.99.3 (July 24, 2009)</h2>
<p>
This release contains mostly bug fixes and small feature
improvements. The most notable change that might affect existing
applications is a simplified internal path API behavior.
</p>
<h3>A) New classes:</h3>
<dl>
<dt><a href="classWt_1_1WAbstractItemDelegate.html">WAbstractItemDelegate</a>
and <a href="classWt_1_1WItemDelegate.html">WItemDelegate</a></dt>
<dd><samp>WAbstractItemDelegate</samp> is a helper class used
by <samp>WTreeView</samp> (and in the future perhaps other view
classes) to render contents. The standard
implementation, <samp>WItemDelegate</samp> maintains the default
implementation that was previously integrated
in <samp>WTreeView</samp>. The delegate will be responsible for
editing features in <samp>WTreeView</samp> in the future, and in
fact, you can already implement a custom item delegate that does
editing if you cannot wait for it!
</dd>
<dt><a href="classWt_1_1Test_1_1WTestEnvironment.html">Test/WTestEnvironment</a></dt>
<dd><samp>WTestEnvironment</samp> is an environment class which is useful for
(unit) test-cases: it allows the instantiation of a
<samp>WApplication</samp> so that you may include widgets in unit tests.
</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
<h3>C) API Changes:</h3>
<dl>
<dt>change of WApplication::internalPathChanged() semantics.</dt>
<dd>The old behavior was that a single internal path change caused
by the user (e.g. by moving forward/backword through his browser
history) would cause repetitive invocations of internalPathChanged()
with different arguments. The underlying idea was that this would
make it easier to have the handling of internal path changes
distributed over different objects. It caused however more problems
than it solved. The new behavior is now that it is invoked exactly
one time, and the argument is simply the new internal path.</dd>
</dl>
<hr />
<h2>Release 2.99.2 (May 29, 2009)</h2>
<p>
This release contains mostly build improvements, bug fixes, and API cleanups.
</p>
<h3>A) New classes:</h3>
<dl>
<dt><a href="classWt_1_1Http_1_1Client.html">Http/Client</a></dt>
<dd><samp>Client</samp> is a utility class to bootstrap a new Wt
application.</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
<dl>
<dt><a href="classWt_1_1Ext_1_1FormField.html">Ext::FormField</a></dt>
<dd>Add setFocus() method.</dd>
<dt><a href="classWt_1_1Ext_1_1ToolBar.html">Ext::ToolBar</a></dt>
<dd>Added an addStretch() method (contributed by David Galicia).</dd>
<dt><a href="classWt_1_1Http_1_1Response.html">Http::Response</a></dt>
<dd>Added a continuation() method.</dd>
<dt><a href="classWt_1_1WCheckBox.html">WCheckBox</a></dt>
<dd>Add support for tri-state checkboxes. These are also supported
by item models and WTreeView.</dd>
<dt><a href="classWt_1_1WWDialog.html">WDialog</a></dt>
<dd>Support for non-modal dialogs and interactive moving.</dd>
<dt><a href="classWt_1_1WFormWidget.html">WFormWidget</a></dt>
<dd>New methods setReadOnly() and isReadOnly().</dd>
<dt><a href="classWt_1_1WGridLayout.html">WGridLayout</a></dt>
<dd>Support a row stretch value of -1, which is like 0 but will still
manage the height of cells (allowing their contents to fill the entire
cell).</dd>
<dt><a href="classWt_1_1WPaintDevice.html">WPaintDevice</a></dt>
<dd>Support update rendering (not erasing the current canvas) using
paint flags.</dd>
</dl>
<h3>C) API Changes:</h3>
<dl>
<dt>WFileUpload::isUploaded() was deprecated</dt>
<dd>The name was not covering its actual behavior: instead of
checking whether a file has been uploaded, it returns whether true
when a call to upload() is not needed. You should replace any call
to isUploaded() with the new method
<a href="classWt_1_1WFileUpload.htm#66376fb4668a037760a91abad9f83f8al">!canUpload()</a> (<b>note the inversion!</b>.</dd>
</dl>
<hr />
<h2>Release 2.99.1 (Mar 20, 2009)</h2>
<p>
This release contains only build improvements, bug fixes, and API cleanups.
</p>
<hr />
<h2>Release 2.99.0 (Mar 4, 2009)</h2>
<p>
This release is a preview for Wt 3.0.0. Many things have changed both
in the internals and the API. This is the first release that provides
several API changes which are not backward compatible (some of which
were post-poned until now).
Please read the following notes carefully, especially sections C) and
D), to understand what changes to expect and how to adapt existing
applications.
</p>
<p>
Support for the C++ boost library &lt; 1.35 has been dropped: Wt now
requires at least boost >= 1.35.0.
</p>
<h3>A) New classes:</h3>
<dl>
<dt><a href="classWt_1_1WFlags.html">WFlags</a></dt>
<dd><samp>WFlags</samp> is a utility class that provides a type-safe ORing of
enum flags. It is used everywhere in the Wt API where previously an
<samp>int</samp> was used to allow enums to be ORed together.</dd>
<dt><a href="classWt_1_1WGoogleMap.html">WGoogleMap</a></dt>
<dd>This is a widget, contributed by Richard Ulrich, that displays a
Google map.</dd>
<dt><a href="classWt_1_1Http_1_1Request.html">Http::Request</a>, <a href="classWt_1_1Http_1_1Response.html">Http::Response</a>, <a href="classWt_1_1Http_1_1ResponseContinuation.html">Http::ResponseContinuation</a> and <a href="classWt_1_1Http_1_1UploadedFile.html">Http::UploadedFile</a></dt>
<dd>These are utility classes which model an HTTP request and
response and that are used in the new <samp>WResource</samp> API.</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
<dl>
<dt><a href="classWt_1_1WApplication.html#d9631ca64e68d30d40cb49c90e55223d">WApplication::enableUpdates()</a></dt>
<dd>Server-initiated updates (aka "server push") has been
reimplemented and now works reliably in all situations, including in
the presence of intermediate proxies. The dependency on the 3rd
party JS orbited library has been removed and replaced with a simple
XHR-based solution.</dd>
<dt><a href="classWt_1_1WButtonGroup.html">WButtonGroup</a></dt>
<dd>Various methods were added: id's may be associated with a specific
radio buttons, which may be used to identify a particular button.</dd>
<dt><a href="classWt_1_1WDatePicker.html">WDatePicker</a></dt>
<dd>Is now easier to use because of a sensible default constructor
that also creates the line edit using a <samp>WDateValidator</samp>,
and creates the icon which is associated with the popup.</dd>
<dt><a href="classWt_1_1WFileResource.html">WFileResource</a></dt>
<dd>Uses the continuation support in the new <samp>WResource</samp> API
to transmit the file in chunks.</dd>
<dt><a href="classWt_1_1WLength.html">WLength</a></dt>
<dd>WLength::Auto was added, is a synonym for WLength()</dd>
<dt><a href="classWt_1_1WSuggestionPopup.html">WSuggestionPopup</a></dt>
<dd>Is now also an MVC View widget, reading its data from a
<samp>WAbstractItemModel</samp></dd>
<dt><a href="classWt_1_1WTable.html">WTable</a></dt> <dd>New method
setHeaderCount() to specify the number of first rows or columns that
should be rendered as an HTML table header
(<samp>&lt;th&gt;</samp>).</dd>
<dt><a href="classWt_1_1WWidget.html">WWidget</a></dt>
<dd><p>New virtual method <samp>rerender()</samp> which allows a
widget to prepare itself before rendering (and defer internal
changes until that time). A widget may ask to be rerendered using
<samp>askRerender()</samp></p> <p><samp>Widget</samp> no longer
inherits from <samp>WResource</samp>, but instead inherits directly from
<samp>WObject</samp>. It was simply a bad idea, and not useful for
anything.</p></dd>
</dl>
<h3>C) Changes that break existing applications:</h3>
<dl>
<dt>1) Signals are no longer public members</dt>
<dd><p>Instead, they are now accessor member functions:
e.g. <samp>WInteractWidget::clicked</samp> has been renamed to
<samp>WInteractWidget::clicked()</samp>. This has as major benefit
that signals can be created on-demand, which leads to drastically
lower memory usage and signifcant speedups especially on embedded
systems.</p> <p>The change requires that everywhere in your code
where you access a signal, you will need to change to add
parentheses. For consistency, you may also want to
use the same convention for your own widget classes that define
signals.</p></dd>
<dt>2) <a href="classWt_1_1WResource.html">WResource</a></dt>
<dd><p>The API has been redesigned and greatly simplified. If you are
implementing your own resources, then you will need to redesign your
implementation. The new API is simpler (requires only one virtual
method to be implemented) and more powerful, providing support for
<i>continuations</i> to serve large resources without blocking a
thread or requiring large memory usage.</p>
<p>In addition, resources have better thread-safety: they are now by
default reentrant (requests for a single resource may be handled
concurrently) and they are protected from concurrently being
destroyed by the main event loop.</p></dd>
<dt>3) <a href="classWt_1_1WValidator.html">WValidator</a></dt>
<dd><p>The signature for the virtual <samp>validate()</samp> method was
changed: parameter <samp>pos</samp> which was ignored anyway has
been removed.</p></dd>
<dt>4) <a href="classWt_1_1WEnvironment.html">WEnvironment</a></dt>
<dd><p>The methods <samp>getArgument()</samp> and
<samp>arguments()</samp> were renamed to respectively
<samp>getParameter()</samp> and <samp>getParameterMap()</samp>. The
signature for <samp>getParameter()</samp> is also different as it
returns a pointer to a string, which is 0 when the parameter is not
defined, instead of the olde behaviour of throwing an
exception. There is a new method that allows to read all values for
a parameter, <samp>getParameterValues()</samp></p></dd>
<dt>5) <a href="classWt_1_1ModelIndex.html">WModelIndex</a></dt>
<dd><p>The 20-byte SHA1 hash based internal pointer has been removed
again as the object increase and overhead could not be justified.</p></dd>
</dl>
<h3>D) Deprecated API that was removed:</h3>
These are API calls that were deprecated in earlier releases, and have now
been completely removed from the library:
<dl>
<dt><samp>WApplication::applicationName()</samp></dt>
<dd>Use <a
href="classWt_1_1WApplication.html#ab6320ecdd0e8e4026e9ef1aca710ca5">
WApplication::internalPath()</a> instead.</dd>
<dt><samp>WApplication::setState()</samp></dt>
<dd>Use <a
href="classWt_1_1WApplication.html#2c1a10aadc0d7ed877b5715b42ca4911">WApplication::setInternalPath()</a>
instead.</dd>
<dt><samp>WApplication::state()</samp></dt>
<dd>Use <a
href="classWt_1_1WApplication.html#ab6320ecdd0e8e4026e9ef1aca710ca5">
WApplication::internalPath()</a> instead.</dd>
<dt><samp>WApplication::stateChanged</samp></dt>
<dd>Use <a
href="classWt_1_1WApplication.html#3e68c4b6bb387f27a614e7962e11967b">WApplication::internalPathChanged()</a>
instead.</dd>
<dt><samp>WRegExpValidator::WRegExpValidator(const boost::regex&amp;)
</samp></dt>
<dd>Use the <a
href="classWt_1_1WRegExpValidator.html#7536b67e2bedd2dfdb5b89c9dd56602b">WRegExpValidator(const
WString&amp;)</a> constructor instead.</dd>
<dt><samp>WPainterPath::drawArc(..., width, height, ...)</samp></dt>
<dd>An elliptical arc segment could not be support on all devices.</dd>
<dt><samp>WTable::numRows()</samp></dt>
<dd>Use <a href="classWt_1_1WTable.html#79d5dfe40ee5e67c5007ee370e8cd2f3">WTable::rowCount()</a>.</dd>
<dt><samp>WTable::numColumns()</samp></dt>
<dd>Use <a
href="classWt_1_1WTable.html#4d062330d1c9b3f202985b92dcb59d4f">WTable::columnCount()</a>
instead.</dd>
<dt><samp>WText::setFormatting()</samp> and
<samp>WText::formatting()</samp></dt>
<dd>Use <a href="classWt_1_1WText.html#f22c64c4c5fed3d2aef0915a7e5c5866">WText::setTextFormat()</a> and
<a href="classWt_1_1WText.html#c0976c36c5181a534f161ca3724d4296">WText::textFormat()</a> instead.</dd>
</dl>
<hr />
<h2>Release 2.2.3 (Jan 26, 2009)</h2>
<p>This release is a maintenance release, with mostly bug fixes and
feature improvements.</p>
<h3>A) Main new features in existing classes:</h3>
<dl>
<dt><a href="classWt_1_1WAbstractItemModel.html">WAbstractItemModel</a>:</dt>
<dd><samp>const char *</samp> data in <samp>boost::any</samp> is now
also supported.</dd>
<dt><a href="classWt_1_1WAbstractProxyModel.html">WAbstractProxyModel</a>:
</dt><dd>Implemented <samp>toRawIndex()</samp>
and <samp>fromRawIndex()</samp> so that indexes can be recovered
when the model's layout is changed, if the underlying model
provides implementations for <samp>toRawIndex()</samp>
and <samp>fromRawIndex()</samp>.</dd>
<dt><a href="classWt_1_1WComboBox.html">WComboBox</a>:</dt>
<dd>Also supports <samp>StyleClassRole</samp> data role for items</dd>
<dt><a href="classWt_1_1WDialog.html">WDialog</a>:</dt>
<dd>New method <samp>setTitleBarEnabled()</samp> to disable the default
title bar.</dd>
<dt><a href="classWt_1_1WMenu.html">WMenu</a>:</dt>
<dd>New method <samp>removeItem()</samp>, only works when rendered as a
list.</dd>
<dt><a href="classWt_1_1WTabWidget.html">WTabWidget</a>:</dt>
<dd>New method <samp>removeTab()</samp>.</dd>
<dt><a href="classWt_1_1WTreeView.html">WTreeView</a>:</dt>
<dd><ul>
<li>New method <samp>setColumn1Fixed()</samp> to fix the first
column while scrolling horizontally through the other columns.</li>
<li>New method <samp>setColumnFormat()</samp> to control formatting of
data.</li>
<li>New method <samp>setColumnBorder()</samp> to set the
internal column border color.</li>
<li>New method <samp>setColumnResizeEnabled()</samp> to disable resize
handles.</li>
<li>The view now also reacts correctly to insertion and
removal of model columns.</li>
</ul>
</dd>
</dl>
<h3>B) New examples</h3>
<dl>
<dt><a href="http://www.webtoolkit.eu/wt/examples/gitmodel/gitview.wt">
gitmodel:</a></dt>
<dd>An example that demonstrates how to implement a custom abstract
item model.</dd>
<dt><a href="http://www.webtoolkit.eu/wt/examples/treeview-dragdrop/treeview-dragdrop.wt">treeview-dragdrop</a>:</dt>
<dd>An example that demonstrates drag and drop support in WTreeView.</dd>
</dl>
<h3>C) Changes that break backward compatibility</h3>
<dl>
<dt><a href="classWt_1_1WApplication.html">WApplication</a>:</dt>
<dd><samp>useStyleSheet()</samp> only supports a subset of IE condition
strings, since the string is now parsed by Wt rather than by IE (when
dynamically loading stylesheets, the comment-syntax does not work
reliably).</dd>
</dl>
<hr />
<h2>Release 2.2.2 (Dec 1, 2008)</h2>
<p><i>As of now, we will also be listing noteworthy new API features,
even if they are no concern for backwards compatibility.</i></p>
<h3>A) New classes:</h3>
<dl>
<dt><a href="classWt_1_1WPopupMenu.html">WPopupMenu</a>,
<a href="classWt_1_1WPopupMenuItem.html">WPopupMenuItem</a>:</dt>
<dd>A popup menu, which you would typically use to present a
context menu.</dd>
<dt><a href="classWt_1_1WAbstractProxyModel.html">WAbstractProxyModel</a>,
<a href="classWt_1_1WSortFilterProxyModel.html">WSortFilterProxyModel</a>:</dt>
<dd>Proxy models, which present data from a source model in a
different way.</dd>
<dt><a href="classWt_1_1WLoadingIndicator.html">WLoadingIndicator</a>, <a href="classWt_1_1WDefaultLoadingIndicator.html">WDefaultLoadingIndicator</a>,
<a href="classWt_1_1WOverlayLoadingIndicator.html">WOverlayLoadingIndicator</a>:</dt>
<dd>Customizable loading indicators.</dd>
</dl>
<h3>B) Main new features in existing classes:</h3>
<dl>
<dt><a href="classWt_1_1WTreeView.html">WTreeView</a>, <a href="classWt_1_1WAbstractItemModel.html">WAbstractItemModel</a>:</dt>
<dd>The WAbstractItemModel interface was extended to allow handling
of drag &amp; drop events, and WTreeView now is able to start
dragging and handle dropping of item selections and other data.</dd>
<dt><a href="classWt_1_1JSignal.html">JSignal</a>:</dt>
<dd>You can now pass the original (keyboard/mouse) JavaScript event
as a parameter to custom signals.</dd>
<dt><a href="classWt_1_1WTreeView.html">WTreeView</a>:</dt>
<dd>access mouse event in itemClicked, doubleClicked and
mouseWentDown signals.</dd>
<dt><a href="classWt_1_1WServer.html">WServer</a>:</dt>
<dd>Support for widget-set mode, allowing a Wt application to be
embedded in an existing web page/application.</dd>
</dl>
<h3>C) Changes that break backward compatibility</h3>
<p>This release does not contain changes that break existing
applications.</p>
<hr />
<h2>Release 2.2.1 (Nov 3, 2008)</h2>
<p>This release is as usually a mix of bug fixes, improvements and new
features.</p>
<p>We have made a significant change to the MVC system, which will
break existing program code in case you have implemented your own
models (i.e. deriving from <samp>WAbstractItemModel</samp>) or views
widgets (i.e. components that listen to model changes).</p>
<p>
The <samp>WAbstractItemModel</samp> interface was changed to support
hierarchical models. This means that most methods will now take an
extra parameter that specifies the parent <samp>WModelIndex</samp>,
and also all signals have now this extra parameter. Because the
parameter has a default value of WModelIndex() which corresponds to
the top level parent, the API is largely backwards compatible when
merely using the model. It is only those classes that reimplement the
interface, or listen to signal events, that are affected.
</p>
<p>
The immediate benefit of the new <samp>WAbstracItemModel</samp>
interface is that it allows us to implement View widgets like the new
<samp>WTreeView</samp> widget.
</p>
<hr />
<h2>Release 2.2.0 (Sept 12, 2008)</h2>
<p>This release has a rather substantial rewrite (and simplification)
of Wt's bootstrapping process. In the past, Wt used a frameset trick
to be able to load the AJAX-based skeleton when JavaScript was
available. Isntead, now, the entire AJAX-based stuff is loaded
directly into the bootstrap page. A benefit of the new approach is
that we avoid iframe tricks, which have been deprecated from strict
HTML and XHTML. But, it was in fact motivated in the first place to
support all major browsers for a new internal path API. This new API
allows to fully support URL changes and bookmarks in a unified way
(i.e. it works equally when the browser supports AJAX, no JavaScript,
or is a bot such as google bot).</p>
<p>As a consequence, this release contains the following changes that
may break your application:</p>
<ul>
<li><samp>WMenu::enableBrowserHistory()</samp> and <samp>WMenu::browserHistoryId()</samp> have been removed, use the new methods <samp>WMenu::setInternalPathEnabled()</samp> and <samp>WMenu::setInternalBasePath()</samp>
</li>
<li><samp>WMenuItem</samp> has been reorganized, and if you have
specialized WMenuItem you will need to adapt your reimplementation
to the new virtual interface. In the new interface, you need to
reimplement <samp>WMenuItem::createItemWidget()</samp> and
<samp>WMenuItem::updateItemWidget()</samp> allowing you to react to
item changes (internal path or text). The default implementation now
always uses a WAnchor.</li>
<li><samp>WApplication::setState()</samp>, <samp>WApplication::state()</samp> and <samp>WApplication::stateChanged</samp> have been deprecated. It is stronly advised that you use the new internal path API instead. This does require you to treat different parts of the state as a file hierarchy. See the <samp>WApplication::setInternalPath() documentation</samp>.
</li>
</ul>
<p>
The following methods have been deprecated (but are still supported):
</p>
<ul>
<li><samp>WTable::numRows()</samp> has been renamed
to <samp>WTable::rowCount()</samp>.</li>
<li><samp>WTable::numColumns()</samp> has been renamed
to <samp>WTable::columnCount()</samp>.</li>
</ul>
<hr />
<h2>Release 2.1.5 (July 25, 2008)</h2>
<p>Wt now installs its include files in a Wt/ subdirectory. You may
want to change your build files to pick up this new include directory,
or, change your code to scope the include files to look like
#include&lt;Wt/WLineEdit&gt; instead of #include&lt;WLineEdit&gt;</p>
<p>This release contains the following changes that may break your
application:</p>
<ul>
<li><samp>WText</samp> will validate XHTML text when it is set to the
widget. The old behaviour was to validate only before
rendering. The change was needed to be able to react to XML parse
errors. As a consequence if you are creating a WText with text that
is not valid XML, followed by a
call <samp>setFormatting(WText::PlainFormatting)</samp>, you should
change this now to use the new <samp>WText</samp> constructor which
takes the TextFormat as a new argument: <samp>new WText(text,
Wt::PlainText, parentWidget)</samp>
</li>
<li><samp>WContainerWidget::setLayout(WLayout *layout, bool fitWidth, bool
fitHeight)</samp> has been replaced with the more generic
<samp>WContainerWidget::setLayout(WLayout *layout, int
alignment)</samp>.
</li>
</ul>
<p>
The following methods and enumerations have been deprecated (but are
still supported):
</p>
<ul>
<li><samp>enum WText::Formatting</samp> has been renamed
to <samp>Wt::TextFormat</samp>. The old values map as follows on new
values:
<ul>
<li><samp>WText::XHTMLFormatting</samp> becomes <samp>Wt::XHTMLText</samp>;</li>
<li><samp>WText::XHTMLUnsafeFormatting</samp> becomes <samp>Wt::XHTMLUnsafeText</samp></li>
<li><samp>WText::PlainFormatting</samp> becomes <samp>Wt::PlainText</samp></li>
</ul>
</li>
<li><samp>WText::setFormatting()</samp> has been renamed
to <samp>WText::setTextFormat()</samp> and
<samp>WText::formatting()</samp> has been renamed
to <samp>WText::textFormat()</samp>.</li>
</ul>
<hr />
<h2>Release 2.1.4 (July 4, 2008)</h2>
<p>The following has changed for building Wt:</p>
<ul>
<li>The CMake variable CONFIGURATION (which defaulted to
/etc/wt/wt_config.xml) is no longer used, but instead there is now a
CONFIGDIR (/etc/wt/) which is used to store configuration
files.
</li>
</ul>
<p>The following has changed in the wt_config.xml file:</p>
<ul>
<li>The &lt;valgrind-path&gt; setting for the FCGI connector may now
be a command-line including arguments</li>
</ul>
<p>This release should not contain changes that may break your
application.</p>
<hr />
<h2>Release 2.1.3 (May 20, 2008)</h2>
<p>This release should not contain changes that may break your
application.</p>
<hr />
<h2>Release 2.1.2 (April 14, 2008)</h2>
<p>The following changes may break your application build:</p>
<ul>
<li><samp>WTreeNode::expanded()</samp> has been renamed
to <samp>WTreeNode::isExpanded()</samp>.</li>
</ul>
<hr />
<h2>Release 2.1.1 (April 10, 2008)</h2>
<p>This release should not break any of your applications, but we did
deprecate some methods and enumeration types. You are advised to
migrate to the replacements methods since we will discontinue support
for the older ones in the future.</p>
<p>
The following methods and enumerations have been deprecated:
</p>
<ul>
<li><samp>enum SelectionUnit</samp> has been renamed
to <samp>SelectionBehavior</samp>. The old values map as follows on new
values: <samp>CellSelection</samp> becomes <samp>SelectItems</samp>;
<samp>RowSelection</samp> becomes <samp>SelectRows</samp>.</li>
<li><samp>WWidget::setOffset(int sides, WLength)</samp> is deprecated,
and the new method is <samp>WWidget::setOffsets(WLength, int
sides)</samp>: the argument order has been switched to be consistent
with the method signature of <samp>setMargin()</samp>
and <samp>setPadding()</samp>.</li>
<li><samp>WResource::suggestFilename()</samp> has been renamed to
<samp>WResource::suggestFileName()</samp>.</li>
</ul>
<p>
The following changes affect run-time behaviour:
</p>
<ul>
<li><samp>WTreeNode</samp> now supports a policy for when to show a child count
indication. The old behaviour was to always show the child count.
Now, by default this option is disabled. Use
<samp>WTreeNode::setChildCountPolicy(Enabled)</samp> to get the old
behaviour back, if you wish.</li>
</ul>
<hr />
<h2>Release 2.1.0</h2>
<p>The library dependencies have changed slightly.</p>
<p>
To build Wt 2.1.0, you need:
</p>
<ul>
<li>CMake 2.4 or later</li>
<li>boost 1.34.1 (boost 1.33.1 might should still work, but is
not recommended)</li>
<li>asio 0.3.9: either the boost or non-boost version <i>(only
for the http connector)</i></li>
<li><i>optionally</i>, openssl for HTTPS support <i>(only for the http
connector)</i></li>
<li><i>optionally</i>, libz for gzip compression support <i>(only for
the http connector)</i></li>
<li>fcgi library, including C++ bindings (libfcgi++)<i>(only for the
fcgi connector)</i></li>
</ul>
<p>Furthermore, the Wt::Ext library has been upgraded and now wraps
around the extjs 2.x library, instead of extjs 1.x.</p>
<p>Some API changes may need a porting effort:
</p>
<ul>
<li><samp>Ext::ProgressDialog</samp>: doesn't show by default, you
need to call show() to show the dialog.</li>
<li><samp>Ext::ContentPanel</samp>, <samp>Ext::BorderLayout</samp> have
been removed. They have been replaced with a stand-alone layout
system, that may manage contents in
an <samp>Ext::Container</samp>. The layout system provides
<samp>WBorderLayout</samp> and several other layout managers.</li>
<li><samp>WSignalMapper</samp> has been expanded to allow mapping of
signals with an extra argument, which is passed to the mapped
signal. Because of this, the signature of the class has been
expanded with an extra template argument. If you have forward
declarations to <samp>WSignalMapper</samp>, you will need to modify
these too (or simply include <samp>WSignalMapper</samp>).</li>
<li><samp>WAnchor</samp>: no longer uses a <samp>WLabel</samp> internally,
and the label-releated methods have been removed.</li>
</ul>
<hr />
<h2>Release 2.0.5</h2>
<ul>
<li><samp>WDialog</samp> (and <samp>WMessageBox</samp>) usage changed, and
is now more like Qt. When you are not
using <samp>WDialog::exec()</samp> or <samp>WMessageBox::show(...)</samp>,
then you must explictly <samp>show()</samp> the dialog to show it. You
can now also <samp>hide()</samp> the dialog if you want.
</li>
<li>
Moved several enums from within classes to the Wt namespace. This is
likely to break your code at compile time when you are using one. The
fix is to remove the class scope from the enum type or value.
<ul>
<li><samp>WScrollArea::Orientation</samp> -> <samp>Wt::Orientation</samp></li>
<li><samp>WMenu::Orientation</samp> -> <samp>Wt::Orientation</samp></li>
<li><samp>WMessageBox::StandardButton</samp> -> <samp>Wt::StandardButton</samp></li>
<li><samp>WMessageBox::Icon</samp> -> <samp>Wt::Icon</samp></li>
</ul>
</li>
</ul>
<hr />
<h2>Release 2.0.4</h2>
<i>Important: 2.0.4a contains a fix for a bug introduced in 2.0.4 that
reset the deploy-path in wthttpd.</i>
<p>
This release adds a few new features:
</p>
<ul>
<li><samp>WComboBox</samp> (and <samp>WSelectionBox</samp>) now use
a <samp>WAbstractItemModel</samp> in a more flexible model/view
system.</li>
<li>Stylesheets may be browser-conditional (by Patrick Fischer)</li>
<li>wthttpd may serve custom error pages (by Patrick Fischer)</li>
<li><samp>WResource</samp> can now access HTTP GET or POST query
arguments. This will break your code (at compile time) if you
have implemented your own <samp>WResource</samp>, since the signature of the
<samp>streamResourceData()</samp> method has been changed to pass
the arguments map as a second parameter.</li>
</ul>
<hr />
<h2>Release 2.0.1</h2>
<p>
This release fixes some build-related problems, as well as smaller
bugs. The main improvement in this release is related to use of Wt
in resource-constrained embedded systems.
</p>
<p>
The most visible change is that the dependency on the Xerces C++ XML
library was dropped in favour of the much smaller Mini-XML
library. The draw-back is a reduction of supported character
encodings to only UTF8 and UTF16, next to the default locale character
encoding (which is typically an 8-bit flavour).
</p>
<p>
When using the built-in httpd, you can now disable support for SSL
at compile time, freeing a number of SSL-related dependencies.
</p>
<p>
In the API, more comparison operators (== and !=) were added to
WString, and a WViewWidget was added for simple MVC widgets (with
the main purpose to reduce session-state at the server).
</p>
<hr />
<h2>Release 2.0.0</h2>
<p>
This release contains numerous changes which are likely to cause some
porting effort for Wt 1.1.x applications to work properly.
</p>
<p>
<b>If you are upgrading from a 1.99.x release, you will notice that
some of these notes have actually evolved, especially with respect to
WString and unicode support.</b>
</p>
<p>
Here is a list of changes with respect to Wt 1.1.x that are likely
to require your attention, and some tips on how to do the porting.
</p>
<h4>1) Namespace Wt</h4>
<p>All Wt classes are now inside the namespace <samp>Wt</samp>.</p>
<p>To handle this change, you will need to:
</p>
<ul>
<li>Wrap forward declarations to Wt widgets in header files inside a
Wt namespace, or <samp>#include &lt;WFwdDeclarations&gt;</samp></li>
<li>and scope all Wt classes with <samp>Wt::</samp>, </li>
<li>or import the Wt namespace: <samp>using namespace Wt;</samp></li>
</ul>
<h4>2) WString</h4>
<p>
Previously, most widgets offered double methods that either used a
<samp>std::string</samp> for literal text, or a
<samp>WMessage</samp> for localized text.
</p>
<p>
In the new release, widgets use <samp>Wt::WString</samp> for both
literal and localized text. WString offers unicode support for both
literal as well as localized text. To create a literal string,
simply assign or construct a Wt::WString from that string. The
strings supported or both narrow and wide C and C++ strings. UTF8
encoded narrow strings may also be converted. To create a localized
string, use one of the static methods <samp>WString::tr(const
std::string key)</samp> and <samp>WWidget::tr(const std::string
key)</samp>.
</p>
<p>
To help with legacy code, WMessage is now a typedef for WString, but
is deprecated and should not be used in new code. Unfortunately, the
constructors <samp>WMessage(const char *text)</samp> and
<samp>WMessage(const std::string text)</samp>, changed meaning!
While previously they took a key to construct a localized message,
they now take a literal text (the exact opposite!), since they are
in fact plain WString() constructors. As a consequence your application
will display key values instead of resolving those values (but will
not break entirely).
</p>
<p>
The new approach offers the benefit of only requiring one method
signature for both literal and localizable text. This not only
simplifies our work, but more importantly by using
<samp>WString</samp> for displayed text in the API of your own
widgets, localization (including the automatic language switching)
comes automatically and is decided on by the user of your widget.
</p>
<p>
Fortunately, there is a straightforward trick to handle most consequences
of this change:
</p>
<ul>
<li>Replace <samp>WMessage(...)</samp> with <samp>tr(...)</samp>,</li>
<li>add <samp>.value()</samp> when using the result of functions such
as <samp>WText::text()</samp>,</li>
<li>change your own classes to use <samp>WString</samp>
wherever they expect some text that will be displayed, instead of
std::string or WMessage.</li>
</ul>
<h4>3) Wide string API</h4>
<p>
Since Wt 2.0.0, the API for Wt has been changed to use WString
instead of C++ narrow strings. WString supports both narrow and wide
strings, and provides conversion between both. It does not provide
string operations, however, and instead acts as a string
container. You should convert to a C++ string type to perform
operations. You should also not use WString outside of the user
interface part of your application.
</p>
<h4>4) No more wmain()</h4>
<p>
Previously, the Wt library implemented the <samp>main(int argc, char
**argv)</samp> function, and called a <samp>wmain()</samp> function
which created the WApplication instance.
</p>
<p>
Wt 2.0.0 allows multiple applications to run within a single process.
Therefore, the <samp>WApplication::exec()</samp> approach was no longer
feasible. The new approach requires that:
</p>
<ul>
<li>your main function should look like this:
<pre>
int main(int argc, char **argv)
{
return Wt::WRun(argc, argv, &amp;createApplication);
}
</pre>
</li>
<li>where createApplication is a function of the following
signature:
<pre>
Wt::WApplication *createApplication(const Wt::WEnvironment&amp; env)
{
// return a new application object.
}
</pre>
</li>
</ul>
<h4>5) Configuration in /etc/wt/wt_config.xml</h4>
<p>
Wt 2.0.0 uses a configuration file for a number of settings that
could previously be configured at build time of the library, or
in the API. The latter functions are:
</p>
<ul>
<li><samp>WApplication::setMaximumRquestSize()</samp></li>
<li><samp>WApplication::setIdleTimeout()</samp></li>
</ul>
<h4>6) Removed obsolete classes</h4>
<p>
Wt 2.0.0 removed a number of classes that were still in the widget
tree, but have been obsoleted by more flexible classes:
</p>
<ul>
<li><samp>WAbstractTab</samp>, <samp>WButtonTab</samp>, and <samp>WTabWidget</samp> are obsoleted by the more flexible <samp>WMenu</samp>.</li>
</ul>
<h4>7) Deprecate boost::regex from WRegExpValidator API</h4>
<p>
The constructor and methods that takes a boost::regex object in
the WRegExpValidator API have been deprecated, to remove the dependency
on boost from the public API. You should consider the std::string based
construtor and method instead.
</p>
<h4>8) WObject::emit() has been removed.</h4>
<p>
Since Wt 1.99.1, we have removed WObject::emit() function. Instead,
you may simply call the signal with its arguments, or use the
explicit emit method (recommended).</p>
<p>
To adapt your code, you should:
</p>
<ul>
<li>Replace all <samp>emit(MySignal(...))</samp> with <samp>MySignal(...)</samp> or <samp>MySignal.emit(...)</samp>
</li>
</ul>
<h4>9) WResource::streamResourceData() signature has changed.</h4>
<p>
Since Wt 2.0.0, WResource::streamResourceData() returns a boolean value
which indicates if all data has been streamed. If you have reimplemented
WResource for your applications, you must update the signature and return
true.
</p>
<p>
The change is relevant only within the new server-push support that is
now in Wt 2.0.0. This allows you to continuously append to the content
of a resource.
</p>
<h4>10) Rename of WJavascriptSlot to JSlot.</h4>
<hr />
<h2>Release 1.1.7</h2>
This release contains lots of additions and improvements, but should
be completely backwards-compatible.
<hr />
<h2>Release 1.1.6</h2>
There is one change which will impact the behaviour of current applications:
Currently, on exit, by default the last widget updates are shown. So, no
more good-bye message. This changes slightly when one needs to redirect()
to a new location: not when WApplication::exec() returns, but during the
same event handling as when calling WApplication::quit().
<hr />
<h2>Release 1.1.5</h2>
Nothing special...
<hr />
<h2>Release 1.1.4</h2>
Changes to impact everybody, since the previous release:
<ul>
<li>
The dependency for libxml++ (and its large number of dependencies) has
been dropped, and replaced by Xerces-C++ (which has no further dependencies).
</li>
<li>
Wt programs need to link against libwtfcgi.so, instead of libwt.so. In the
future Wt will also support different web-connnector systems besides
FastCGI.
</li>
<li>
The signatures of wmain() and WApplication constructor have changed:
new signatures are:
<ul>
<li><samp>int wmain(const WEnvironment&amp; env)</samp></li>
<li><samp>WApplication::WApplication(const WEnvironment&amp; env)</samp></li>
</ul>
</li>
</ul>
<h3>Other changes:</h3>
<ul>
<li>Support for unicode is implemented, but perhaps needs more testing
by non-Western people ? Only UTF-8 is supported currently.</li>
<li>Addition of a WTimer class -- see mission example.</li>
<li>Many bug fixes which should make Wt more robust against illegal CGI
requests (which are ignored), and now Wt should exit cleanly in more
(all?) circumstances.</li>
<li>Addition of feed-back for pending AJAX requests (does not work yet on
IE).</li>
<li>Support for style sheets is improved: now inline decoration styles
will override style sheet styles. See hangman or treelist examples.</li>
<li>The browser can be redirected to a new page. This is useful when the
application is terminated -- or to change during the application from
HTTP to HTTPS and back.</li>
<li>WValidationStatus API has changed -- less complicated now.</li>
</ul>
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