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|
<!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1" />
<style type="text/css">
dt { font-weight: bold; }
h3 { text-decoration: underline; }
dd p { margin-top: 0px; }
</style>
<title>Wt Release notes</title>
</head>
<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 3.1.2 (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<unsigned char>) 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>
<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>
<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/tutorial.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
< 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 < 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><th></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&)
</samp></dt>
<dd>Use the <a
href="classWt_1_1WRegExpValidator.html#7536b67e2bedd2dfdb5b89c9dd56602b">WRegExpValidator(const
WString&)</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 & 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<Wt/WLineEdit> instead of #include<WLineEdit></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 <valgrind-path> 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 <WFwdDeclarations></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, &createApplication);
}
</pre>
</li>
<li>where createApplication is a function of the following
signature:
<pre>
Wt::WApplication *createApplication(const Wt::WEnvironment& 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& env)</samp></li>
<li><samp>WApplication::WApplication(const WEnvironment& 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>
</body>
</html>
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