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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 { margin-top: 10px; margin-bottom: 10px; }
dd p { margin-top: 0px; }
dd div { margin: 10px 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 4.0.0 (2017)</h2>
<p>
This release has all of the added features of Wt 3.3.8, but comes with many notable changes. In general,
Wt 4 employs the more modern C++ style of C++11 and beyond. Support for compilers
without sufficient C++11 support is dropped competely. Wt 4 aligns more with the
<a href="https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md">C++ Core Guidelines</a>
in a pragmatic way, while keeping the API familiar.
</p>
<h3>Changes in Wt's memory model</h3>
<p>
Like before, the parent widget (e.g. a <a href="classWt_1_1WContainerWidget.html">WContainerWidget</a>) owns
its child widgets. This has not changed. Wt 4 makes ownership transfers more clear by using <tt>std::unique_ptr</tt>
There are no more owning raw pointers in Wt's public API.
</p>
<p>
By consequence of using <tt>unique_ptr</tt>, constructors no longer take a <tt>parent</tt> argument. For
convenience, <a href="classWt_1_1WContainerWidget.html#a3341360fc6cc1e86c1a42a3a54d9e0c7">addWidget()</a>
now returns a (non-owning) raw pointer. Instead of doing:
<div class="fragment">
<div class="line"><span class="comment"><tt>// parent is a Wt::WContainerWidget*</tt></span></div>
<div class="line"><tt>Wt::WPushButton *button = new Wt::WPushButton("Click me", parent); <span class="comment">// Wt 3: parent owns the button</span></tt></div>
</div>
or:
<div class="fragment">
<div class="line"><tt>Wt::WPushButton *button = new Wt::WPushButton("Click me");</tt></div>
<div class="line"><tt>parent->addWidget(button); <span class="comment">// Wt 3: ownership is transferred to parent through addWidget</span></tt></div>
</div>
You can now do:
<div class="fragment">
<div class="line"><span class="comment"><tt>// Wt 4 (with C++14's std::make_unique)</tt></span></div>
<div class="line"><tt>Wt::WPushButton *button = parent->addWidget(std::make_unique<Wt::WPushButton>("Click me"));</tt></div>
</div>
<tt>Wt::cpp14::make_unique</tt> can be used instead of <tt>std::make_unique</tt> if C++14 support is unavailable.
</p>
<p>
Some classes were changed from the old single ownership
model to shared ownership through <tt>std::shared_ptr</tt>, like models (<a href="classWt_1_1WAbstractItemModel.html">WAbstractItemModel</a>, <a href="classWt_1_1Chart_1_1WAbstractChartModel.html">WAbstractChartModel</a>, and derivates) and <a href="classWt_1_1WValidator.html">validators</a>.
</p>
<p>
<a href="classWt_1_1Core_1_1observing__ptr.html">Wt::Core::observing_ptr</a> was introduced. This pointer will
be notified when the object it points to is deleted. <tt>observing_ptr</tt>s are intended to be used within the
scope of a <a href="classWt_1_1WApplication.html">WApplication</a> and are not thread safe. Every
<a href="classWt_1_1WObject.html">WObject</a> (and by consequence, every <a href="classWt_1_1WWidget.html">widget</a>)
is an <a href="classWt_1_1Core_1_1observing_ptr.html">observable</a>, so its lifetime can be observed with
an <tt>observing_ptr</tt>. Their use is entirely optional, but they may be useful when the lifetime of an
object is not always clear.
</p>
<h3>Header files now end in .h</h3>
Wt 3 used extensionless headers. This confuses many editors and IDEs.
For Wt 4, the <tt>.h</tt> extension was added, and using the old style headers is deprecated. You can use the
Python script <a href="https://github.com/emweb/wt/blob/wt4/migrate/wt4_add_h_to_includes.py">migrate/wt4_add_h_to_includes.py</a> to help update your Wt includes.
<h3>Enums replaced by enum classes</h3>
Many enums were replaced with enum classes, and many have been moved from class scope to namespace scope, e.g.:
<div class="fragment">
<div class="line"><tt>enum SelectionMode {</tt></div>
<div class="line"><tt> NoSelection = 0,</tt></div>
<div class="line"><tt> SingleSelection = 1,</tt></div>
<div class="line"><tt> ExtendedSelection = 3</tt></div>
<div class="line"><tt>};</tt></div>
</div>
became:
<div class="fragment">
<div class="line"><tt>enum class SelectionMode {</tt></div>
<div class="line"><tt> None = 0,</tt></div>
<div class="line"><tt> Single = 1,</tt></div>
<div class="line"><tt> Extended = 3</tt></div>
<div class="line"><tt>};</tt></div>
</div>
Some enums were preserved in places were the added verbosity
was undesirable, like the <a href="group__dbo.html#ga1d0ec6819b1bf5b7a88ad030b91ca564">Wt::Dbo::RelationType</a> enum.
<h3>Replacements for Boost</h3>
Many features of Boost that Wt relied on were made obsolete by C++11. Many other Boost features have been replaced
with C++11-based alternatives.
<dl>
<dt>Choice between Boost.Asio and standalone Asio</dt>
<dd>
The CMake option <tt>WT_ASIO_IMPLEMENTATION</tt> allows to choose between <tt>boost</tt> and <tt>standalone</tt>
Asio.</dd>
<dt>Removal of Boost usage in Wt headers</dt>
<dd>
If standalone Asio is used, the installed headers of Wt no longer include any Boost headers.
The Windows builds of Wt 4 will from now on no longer include Boost,
including only the standalone Asio headers instead. This just about halves the size of the installer.
If you want to use Boost, you'll have to provide your own. You can find prebuilt Boost binaries for Windows
<a href="https://sourceforge.net/projects/boost/files/boost-binaries/">here</a>.
</dd>
<dt>Boost.Date_Time was replaced with Howard Hinnant's <tt>std::chrono</tt>-based date implementation</dt>
<dd>
The author of the <tt>std::chrono</tt> standard has created a
<a href="https://github.com/HowardHinnant/date">library for dates and time zones</a>.
This library is proposed for inclusion into the C++ standard in the future. For now, Wt includes
this date and time zone library (at this moment, this is version 2.2). This is used for all time-related
classes, like <a href="classWt_1_1WDate.html">WDate</a>,
<a href="classWt_1_1WTime.html">WTime</a>, <a href="classWt_1_1WDateTime.html">WDateTime</a>,
and <a href="classWt_1_1WLocalDateTime.html">WLocalDateTime</a>.
</dd>
<dt>
Boost.Any replaced by <tt>Wt::cpp17::any</tt>
</dt>
<dd>
<a href="classWt_1_1WStandardItemModel.html">WStandardItemModel</a> relied heavily on
<tt>boost::any</tt>. This was replaced with <tt>Wt::cpp17::any</tt>. You can choose the
implementation of <tt>any</tt> to use with the CMake option <tt>WT_CPP17_ANY_IMPLEMENTATION</tt>.
Valid options are:
<ul>
<li><a href="https://github.com/thelink2012/any">thelink2012</a>: this is the default implementation, included in Wt</li>
<li><tt>experimental</tt> for <tt>std::experimental::any</tt></li>
<li><tt>std</tt> for C++17's <tt>std::any</tt></li>
</ul>
</dd>
<dt>Boost.Signals2 replaced with own implementation</dt>
<dd>
<p>
Wt did not use many of the features of Boost.Signals2. Since C++11, many more efficient alternatives
have been created. Wt 4's implementation, based on
<a href="https://testbit.eu/cpp11-signal-system-performance/">this blog post</a>, offers better performance
and more understandable stack traces. It's now no longer necessary to
use <tt>std::bind</tt> with lambda functions, e.g.:
<div class="fragment"><div class="line"><tt>button->clicked().connect(std::bind([]{ std::cout << "Clicked!" << std::endl; })); <span class="comment">// Wt 3</span></tt></div></div>
can be changed to:
<div class="fragment"><div class="line"><tt>button->clicked().connect([]{ std::cout << "Clicked!" << std::endl; }); <span class="comment">// Wt 4</span></tt></div></div>
</p>
<p>
Boost.Signals2, together with <tt>boost::bind</tt>, allowed you to automatically disconnect slots
when one of their bound arguments was deleted, if the argument was a derived class of
<tt>boost::signals2::trackable</tt>. In Wt 4, this is no longer the case. Instead, you
can provide a target <a class="classWt_1_1WObject.html">WObject</a> as the first argument to
the connect function, and Wt will disconnect the slot when the target <tt>WObject</tt> is deleted.
</p>
<p>
<tt>WApplication::bind</tt> has been removed, and instead
<a href="classWt_1_1Core_1_1observable.html#a8ef9ce1dc22e3bae13e198b27e6b64cc">observable::bindSafe</a>
was introduced. <tt>bindSafe</tt> will guard the <tt>observable</tt>, returning a function
object that doesn't do anything if the <tt>observable</tt> has been deleted.
</p>
</dd>
<dt>Other Boost libraries obsoleted by C++11</dt>
<dd>Boost.Thread, Boost.Regex and Boost.Random were mostly replaced by their STL counterparts. Only
Boost.Thread is used internally in Wt 4 because Wt uses some mutex functionality that's not part of
C++11.</dd>
</dl>
<h3>Other changes:</h3>
<ul>
<li>
<a href="classWt_1_1ItemDataRole.html">ItemDataRole</a> is now a class instead of an enum.
</li>
<li>
Wt 4 assumes that <tt>std::string</tt> is UTF-8 encoded by default, so
<a href="classWt_1_1WString.html#a64d17e31e557208ab8d8ea765c1e52b8">WString(std::string)</a>
will assume that the argument is UTF-8 encoded. Overloads for new C++11 string types
(<tt>std::u16string</tt>, <tt>std::u32string</tt>) have been added.
</li>
<li>
Intervals and other durations previously indicated by <tt>int</tt>s have been replaced by
<tt>std::chrono::duration</tt>s, e.g. in
<a href="classWt_1_1WIOService.html#a5e445e207ee36f75cea4ba7ae321d7dc">WIOService::schedule()</a> or
<a href="classWt_1_1Http_1_1Client.html#a84856aabdef30b9e91bb3c4d30b9ecd1">Wt::Http::Client::setTimeout()</a>.
</li>
<li>
<a href="classWt_1_1WBoxLayout.html">WBoxLayout</a> is now implemented with flexbox instead of JavaScript
by default. Wt will fallback to the old JavaScript implementation when functionality unavailable in
the flexbox implementation is used, use
<a href="classWt_1_1WLayout.html#a9cd0547c710e357e4c688ccfdb790d8f">WBoxLayout::setPreferredImplementation</a>
to set a preferred implementation.
</li>
</ul>
<h3>Removal of deprecated functionality</h3>
<ul>
<li>
Everything that was marked as deprecated in Wt 3.3.7 has been removed,
including <tt>Wt::Ext</tt>.
</li>
<li>
<tt>WScrollArea</tt> was removed, use CSS or
<a href="classWt_1_1WContainerWidget.html#af3d9510f569deed060689aa509ecc831">WContainerWidget::setOverflow()</a> instead.
</li>
</ul>
<h2>Release 3.3.8 (August 2017)</h2>
<p>
This release consists of bug fixes and some new features:
</p>
<dl>
<dt>
OpenID Connect support
</dt>
<dd>
As we've previously announced
<a href="https://www.webtoolkit.eu/wt/blog/2017/06/20/announcing_openid_connect_support_in_wt">on our blog</a>,
Wt now supports OpenID Connect. All you need to do to use any OpenID Connect based service is
configure a <a href="classWt_1_1Auth_1_1OidcService.html">Wt::Auth::OidcService</a>. You can also make your
own OpenID Connect identity provider. Check out the accompanying
<a href="https://github.com/emweb/wt/tree/master/examples/feature/oidc">OpenID Connect feature example</a>.
</dd>
<dt>
On Windows: font support based on DirectWrite
</dt>
<dd>
<p>Wt 3.3.7 already introduced the Direct2D backend for <a href="classWt_1_1WRasterImage.html">WRasterImage</a>.
Wt 3.3.8 further expands
on this by adding DirectWrite-based font support. This means that Wt 3.3.8 will be able to
select the appropriate fonts for every glyph, without requiring Pango. Pango was always
difficult to distribute on Windows, so we never included Pango in the binary distribution, relying on
very basic font support instead, replacing unknown characters by question marks. Now, you
can expect much better Unicode support with DirectWrite on Windows.</p>
<p>This means that the binary release of Wt on Windows is now built with Direct2D and DirectWrite.</p>
</dd>
<dt>
Wt::Dbo: added <a href="structWt_1_1Dbo_1_1sql__value__traits.html">sql_value_traits</a> for
<a href="classWt_1_1Json_1_1Object.html">Wt::Json::Object</a> and
<a href="classWt_1_1Json_1_1Array.html">Wt::Json::Array</a>.
</dt>
<dd>
<p>Quite often, the need arises to store some unindexed data with arbitrary structure in a database.
A common solution is to store JSON as a string. To facilitate this, we've included implementations
of <a href="structWt_1_1Dbo_1_1sql_value_traits.html">sql_value_traits</a> for
<a href="classWt_1_1Json_1_1Object.html">Wt::Json::Object</a> and
<a href="classWt_1_1Json_1_1Array.html">Wt::Json::Array</a> in
<tt>Wt/Dbo/WtSqlTraits</tt>. This allows you to store <tt>Wt::Json</tt> Objects and Arrays
just like you any other field.</p>
<p>Additionally, we've made the <tt>Wt::Json</tt> API a bit more friendly, by adding support
for initializer lists (when using C++11), and implicit constructors for
<a href="classWt_1_1Json_1_1Value.html">Wt::Json::Value</a>
from
<a href="classWt_1_1Json_1_1Object.html">Wt::Json::Object</a> and
<a href="classWt_1_1Json_1_1Array.html">Wt::Json::Array</a>.</p>
</dd>
<dt>
Added <tt><allowed-hosts></tt> configuration option for CORS
</dt>
<dd>
Wt used to allow almost any origin, to allow Wt applications to be embedded in any page using
WidgetSet mode. Although Wt encodes session IDs in URLs rather than cookies by default, this
could still pose a security risk in some cases. In Wt 3.3.8, CORS support has been updated:
Wt now only allows cross-origin resource sharing for WidgetSet entry points, and trusts no
host by default. You can specify the allowed hosts using the <tt><allowed-hosts></tt>
tag in the configuration file. Using <tt><allowed-hosts>*</allowed-hosts></tt>
restores the old behaviour.
</dd>
<dt>
Other small improvements:
</dt>
<dd>
<ul>
<li>Any <tt>boost::asio::io_service</tt> can now be used with <a href="classWt_1_1Http_1_1Client.html">Wt::Http::Client</a>,
instead of just <a href="classWt_1_1WIOService.html">Wt::WIOService</a>.</li>
<li>Added support for <tt>PATCH</tt> requests in <a href="classWt_1_1WResource.html">WResource</a> and
<a href="classWt_1_1Http_1_1Client.html">Wt::Http::Client</a>,
next to <tt>GET</tt>, <tt>POST</tt>, <tt>PUT</tt>, and <tt>DELETE</tt>.
<li>wthttp connector: added support for forward secrecy with the <tt>--ssl-prefer-server-ciphers</tt> option.</li>
<li>Added the <tt>num-session-threads</tt> configuration parameter, to set the amount of threads per session when
using dedicated process mode. By default, the main process and the session threads use the same amount of threads.</li>
<li>The <a href="https://github.com/emweb/wt/tree/master/examples/te-benchmark">te-benchmark</a>
example was added, implementing the TechEmpower framework benchmarks.
This example also demonstrates how Wt can be used to write RESTful services. Improved, less verbose, support for
RESTful services is planned in a future release.</li>
<li>Added <a href="classWt_1_1Dbo_1_1FixedSqlConnectionPool.html#a955e2ce03d8d45e8738f6ff718614601">Wt::Dbo::FixedSqlConnectionPool::setTimeout()</a>, to set a timeout for obtaining a connection.</li>
<li>Added <a href="classWt_1_1Dbo_1_1backend_1_1Postgres.html#acb13461474cc43bc9e8a51b844a051f3">Wt::Dbo::backend::Postgres::setTimeout()</a>, to set a timeout for queries.</li>
<li>Added libunwind support for printing stacktraces. Enable this with the <tt>ENABLE_UNWIND</tt> CMake option.</li>
</ul>
</dd>
</dl>
<h2>Release 3.3.7 (March 31, 2017)</h2>
<p>
This release fixes many bugs, but also introduces some new features:
</p>
<dl>
<dt>
<a href="classWt_1_1WFileDropWidget.html">WFileDropWidget</a>
</dt>
<dd>
The WFileDropWidget is a new widget that allows you to upload a file or multiple files by dragging them onto an area.
</dd>
<dt>
Scroll visibility
</dt>
<dd>
Some applications require you to know whether a widget is currently visible within the viewport, or whether it is
scrolled out of view, e.g. to load more content as you scroll down the page. You can now enable scroll visibility
detection with
<a href="classWt_1_1WWidget.html#a5d403e0390841df77a23445b28044d5d">WWidget::setScrollVisibilityEnabled(bool)</a>,
and react to changes in visibility with
<a href="classWt_1_1WWidget.html#aa5ce605dd465e06f3e3c2dbce2a4098e">WWidget::scrollVisibilityChanged()</a>.
A new scrollvisibility feature example has been added to demonstrate this infinite scrolling application.
</dd>
<dt>
Touch events
</dt>
<dd>
Although Wt already supported touch interactions in the charting library, touch events were previously
not exposed by Wt. Now,
we've added <a href="classWt_1_1WTouchEvent.html">WTouchEvent</a>, and the touchStarted, touchEnded, and touchMoved
events have been added to
<a href="classWt_1_1WInteractWidget.html">WInteractWidget</a>.
Also, <a href="classWt_1_1WInteractWidget.html#a556c14d02388720b1d95b2149be2e867">draggable widgets</a> can now also
be dragged after a long press, and you can select a range using a double touch in
<a href="classWt_1_1WTableView.html">WTableView</a> and <a href="classWt_1_1WTreeView.html">WTreeView</a>.
</dd>
<dt>
Combined session tracking mode
</dt>
<dd>
<p>
The default session tracking method for Wt is URL rewriting, using JavaScript to hide the session id from
the address bar. Alternatively, cookies can be used with the Auto option, falling back to URL rewriting when
cookies are not available. However, the cookie-based method did not allow for multiple sessions within the
same browser.
</p>
<p>
In order to make the URL rewriting method with requirement 6.5.10 of the PCI Data Security Standard, while not
sacrificing the ability to have multiple sessions, a new Combined session tracking strategy has been added.
Wt already makes it difficult to steal a session when the session id is discovered, but resources are not as
protected. The Combined session tracking strategy uses URL rewriting in combination with a cookie that is shared
between sessions as an extra measure against session hijacking. This is the most secure strategy, but it will
deny access if cookie support is not available.
</p>
</dd>
<dt>
Wraparound for <a href="classWt_1_1WSpinBox.html">WSpinBox</a> and <a href="classWt_1_1WTimeEdit.html">WTimeEdit</a>
</dt>
<dd>
WSpinBox will now wrap around from its maximum to its minimum if you <a href="classWt_1_1WSpinBox.html#a08413e777fefab00e36dc8d6c492bda5">enable wraparound</a>. WTimeEdit will take advantage of this feature by default.
</dd>
<dt>
On Windows: Direct2D implementation of WRasterImage
</dt>
<dd>
We've added another implementation for WRasterImage on Windows: Direct2D. When building Wt, this
implementation will be enabled by default. This allows to remove the dependency on GraphicsMagick or
Skia on Windows, simplifying the build process.
</dd>
<dt>
Some minor extra features:
</dt>
<dd>
<ul>
<li>
It's now possible to retrieve a vector of all request headers with <a href="classWt_1_1Http_1_1Request.html#a0afe45bf93bb77270a85c75ca67cd521">Wt::Http::Request::headers()</a> in <a href="classWt_1_1WResource.html#a3a740f8cc29e2e6e4e58defc9c88b8b6">handleRequest</a> when implementing a WResource. It is still recommended, and more efficient, to use <a href="classWt_1_1Http_1_1Request.html#ade2596aa6802a63e21460094ea30a4d9">headerValue</a>, but retrieving a vector of all headers could be useful for debugging purposes.
</li>
<li>
In an effort to reduce the amount of JavaScript generated by the charting API, the
<a href="classWt_1_1WPainter.html#abccad19493d7461ca08c9e50ad7326f1">WPainter::drawStencilAlongPath()</a>
method was added to WPainter.
</li>
<li>
Previously, WDialogs were movable by default. It's now possible to disable this with
<a href="classWt_1_1WDialog.html#afbccf557a0343591f3087c9a0a9b7051">WDialog::setMovable()</a>.
</li>
</ul>
</dd>
</dl>
<h2>Release 3.3.6 (July 13, 2016)</h2>
<p>
This release has a focus on bug fixes and some new features:
</p>
<dl>
<dt>
Support for WebSocket compression in wthttp
</dt>
<dd>
WebSocket traffic is now compressed, if possible.
</dd>
<dt>
Time entry improvements
</dt>
<dd>
<a href="classWt_1_1WTimeEdit.html">WTimeEdit</a> now supports AM/PM in its format,
<a href="classWt_1_1WTimeValidator.html">WTimeValidator</a> now allows to select a minimum
and maximum time and supports multiple formats,
<a href="classWt_1_1WTimePicker.html">WTimePicker</a> can now work up to
millisecond precision, and is now rendered with spinboxes.
</dd>
<dt>
Skia version updated
</dt>
<dd>
The Skia backend for <a href="classWt_1_1WRasterImage.html">WRasterImage</a> is now compatible with more recent versions of Skia. If you need
to support an older version of Skia, use <tt>-DWT_SKIA_OLD=ON</tt>. The Skia version of the Windows builds
has been updated from 394c7bb to 834d9e1.
</dd>
<dt>
Wt::Dbo
</dt>
<dd>
<ul>
<li>
It's now possible to mark foreign keys as literal with a “>” prefix, so Wt::Dbo can better map to
an existing schema. Note that for consistency, this also means that the schema generated for ManyToMany relationships
has been changed to include the id column names if a joinId has been specified. If you specify a joinId for ManyToMany
relationships, you'll have to change it to include a “>” before it in order to keep the same database schema.
</li>
<li>
The <tt>size</tt> argument of <a href="group__dbo.html#gac089020eff000d9e2c4ef72cf715bd21">belongsTo()</a> has been
removed, since it served no actual purpose.
</li>
</li>
</dd>
<dt>
Scroll position
</dt>
<dd>
It's now possible to retrieve the scroll position of a
<a href="classWt_1_1WContainerWidget.html">WContainerWidget</a>
with
<a href="classWt_1_1WContainerWidget.html#a0a7ce553b2b5107412a3bed8700355cb">scrollTop()</a>
and
<a href="classWt_1_1WContainerWidget.html#a9a60d382fcd1490081087ce4f3649864">scrollLeft()</a>.
</dd>
<dt>
Invalidation of stateless slots
</dt>
<dd>
<a href="classWt_1_1WObject.html#a6dde4ce1e833a9966709daf3c0dedc9f">WObject::isNotStateless()</a>
has been added, so functions called from functions that are marked as stateless can unmark
it as stateless, reverting to plain server-side dynamic UI updates.
</dd>
<dt>
<a href="classWt_1_1Auth_1_1Dbo_1_1UserDatabase.html">Auth::Dbo::UserDatabase</a>
</dt>
<dd>
The <a href="classWt_1_1Auth_1_1Dbo_1_1UserDatabase.html">Dbo UserDatabase</a> implementation now
compares e-mail addresses case insensitively. The <a href="classWt_1_1Auth_1_1AuthService.html">AuthService</a>
can be passed in the constructor, so the <a href="classWt_1_1Auth_1_1Dbo_1_1UserDatabase.html">UserDatabase</a>
knows whether the IdentityPolicy is EmailAddressIdentity.
</dd>
<dt>
Charting library
</dt>
<dd>
There have been many bug fixes and improvements to the charting library and the interactive features
introduced in Wt 3.3.5:
<ul>
<li>Series <a href="classWt_1_1Chart_1_1WCartesianChart.html#ad05997dbc2d59862e38272985abda9a9">can be selected</a>
on a <a href="classWt_1_1Chart_1_1WCartesianChart.html">WCartesianChart</a>.
LineSeries <a href="classWt_1_1Chart_1_1WCartesianChart.html#a6078b67f146e686bd482d846dfe463cb">can be manipulated</a>.</li>
<li><a href="classWt_1_1Chart_1_1WAxis.html#a16d188d56c2b62b7b3f2ddb6fa96d7cc">WAxis::setZoom()</a> and
<a href="classWt_1_1Chart_1_1WAxis.html#a2f6a11d9d47036f8806c5a8412dfd24c">WAxis::setPan()</a>
have been deprecated in favor of the easier to use
<a href="classWt_1_1Chart_1_1WAxis.html#a0be187399e7cb4877f2c5e3837eba6ea">WAxis::setZoomRange()</a>.
You can listen to changes in zoom range with the
<a href="classWt_1_1Chart_1_1WAxis.html#a7e432917f0f23f18db3a043397a81904">WAxis::zoomRangeChanged()</a> signal.</li>
<li>Series set as hidden will still be shown on a <a href="classWt_1_1Chart_1_1WAxisSliderWidget.html">WAxisSliderWidget</a>.
The typical application for this is to show a coarse model on the slider widget, and a more detailed one on the chart.</li>
<li>
In order to provide better performance for charts containing a lot of data, the charting library has been
overhauled to use <a href="classWt_1_1Chart_1_1WAbstractChartModel.html">WAbstractChartModel</a>s,
instead of <a href="classWt_1_1WAbstractItemModel.html">WAbstractItemModel</a>s, avoiding the use of
boost::any. The <a href="classWt_1_1Chart_1_1WStandardChartProxyModel.html">WStandardChartProxyModel</a>
wraps a <a href="classWt_1_1WAbstractItemModel.html">WAbstractItemModel</a> so that those can still be used with charts.
Note that this changes the return type of the
<a href="classWt_1_1Chart_1_1WAbstractChart.html#a477522bb1720fb20006c81be455b3366">WAbstractChart::model()</a> method.
</li>
<li>A chart's axes can now be <a href="classWt_1_1Chart_1_1WAxis.html#a2bb7c8ec67ed2ff0b57953ea40cd87ef">inverted</a>.
<li>Stacked series: negative values are now stacked separately from positive values.</li>
<li><a href="classWt_1_1Chart_1_1CurveLabel.html">Curve labels</a> can now be drawn on charts, so that curves,
or certain points on curves, can be labeled.</li>
<li><a href="classWt_1_1Chart_1_1WAxis.html#afca24479982f10759be69703de5f4cd4">WAxis::getLabelTicks()</a>
has been modified with an argument
<a href="structWt_1_1Chart_1_1AxisConfig.html">AxisConfig</a>, so that different axis ticks can be drawn depending
on the side that the axis is dawn on, or the zoom level it is drawn at. This is a breaking change if you override getLabelTicks.
<a href="classWt_1_1Chart_1_1WAxis.html#a71928aabf753854274d753e266aabfc2">WAxis::setLabelTransform()</a>
as a simpler method to change the tick
labels depending on the side the axis is drawn on.</li>
<li><a href="classWt_1_1Chart_1_1WDataSeries.html">WDataSeries</a> is no longer a simple value class. The interface of
<a href="classWt_1_1Chart_1_1WCartesianChart.html">WCartesianChart</a> has been modified to reflect that: the old
interface that copies WDataSeries over has been deprecated in favor of an interface that takes pointers to
<a href="classWt_1_1Chart_1_1WDataSeries.html">WDataSeries</a>.</li>
<li>It's now possible to <a href="classWt_1_1Chart_1_1WDataSeries.html#ae668a1a90ccf668e426fc2d9e370bf2c">specify a different model</a>
for each <a href="classWt_1_1Chart_1_1WDataSeries.html">WDataSeries</a>.</li>
<li><a href="classWt_1_1Chart_1_1WPieChart.html#a0ff69f626136fa56e7de27f6a10d770d">Chart::WPieChart::createLabelWidget()</a>
has been added, making it possible to replace the labels of a
<a href="classWt_1_1Chart_1_1WPieChart.html">WPieChart</a>
with widgets.</li>
<li>Tooltips on charts can now be deferred, which can improve performance of interactive charts, and if you have a lot of tooltips.</li>
</ul>
</dd>
</dl>
<hr />
<h2>Release 3.3.5 (Dec 31, 2015)</h2>
<p>
This release has a focus on bug fixes but also one or two new features:
</p>
<dl>
<dt>
<a href="classWt_1_1Chart_1_1WCartesianChart.html">Chart::WCartesianChart</a>
</dt>
<dd>
WCartesianChart has several new features that allow interaction with the
chart without server roundtrips. These features include zoom, pan,
crosshair and follow curve functionality.
This is only available if the chart is drawn
on an HTML canvas. This is the default rendering method on modern browsers.
When enabled, the crosshair will follow mouse movement,
and show in the top right corner the coordinate
(according to X axis and the first Y axis) corresponding to this position.
</dd>
<dt>
<a href="classWt_1_1Chart_1_1WAxisSliderWidget.html">Chart::WAxisSliderWidget</a>
</dt>
<dd>
WAxisSliderWidget lets you easily focus on a particular range by selecting an XAxis. It will create a sliding widget where you can change the size of the focused region by dragging the blue handles, and change the position by dragging the selected area. When using touch, the size of this area can also be changed using a pinch movement.
</dd>
<dt>
<a href="classWt_1_1WPainter.html">WPainter</a>, <a href="classWt_1_1WJavaScriptHandle.html">WJavascriptHandle</a>, <a href="classWt_1_1WCanvasPaintDevice.html">WCanvasPaintDevice</a>
</dt>
<dd>
The above functionality was implemented by making client-side interaction possible for a scene rendered
on WCanvasPaintDevice. For this purpose, for several primitives used to draw on a canvas, we provide
a JavaScript handle and complementary API to manipulate these objects in JavaScript code. In this way you
can keep the bulk of the painting code in C++, and allow manipulation from within JavaScript.
Such JavaScript handlers have been made available for <a href="classWt_1_1WTransform.html">WTransform</a>, <a href="classWt_1_1WPen.html">WPen</a>, <a href="classWt_1_1WBrush.html">WBrush</a>, <a href="classWt_1_1WPointF.html">WPointF</a>, <a href="classWt_1_1WRectF.html">WRectF</a> and <a href="classWt_1_1WPainterPath.html">WPainterPath</a>.
</dd>
<dt> <a href="classWt_1_1WAnchor.html">WAnchor</a> target (such as this window, or new window) moved to <a href="classWt_1_1WLink.html#afda591cd277562d5c8ea723733290790">WLink</a></dt>
<dd>As WLink is used in several places (including for example inside item data models), the target can now be specified in more places in the same consisten way. However, since until now a WAnchor was the owner of the TargetType, this may break existing code which calls WAnchor::setTarget() before WAnchor::setLink(), as the latter overrides the target.
</dd>
<dt>A new <a href="namespaceWt.html#a6c93a6e97016801a310275457e43f333">TargetDownload</a> target was added for links.</dt>
<dd>Until now it was recommended to use TargetNewWindow as otherwise this would interfere with the rendering of the current page (since browsers are unaware of the content-type and content-disposition of the target link until after it unloaded the current page. The new TargetDownload option is implemented using the new HTML5 download attribute or, if not supported, by targetting a hidden iFrame contained in the page.
</dd>
<dt>The included SQLite version was updated</dt>
<dd>
The SQLite version bundled with Wt::Dbo has been updated to version 3.8.10.1. The changelog can be found <a href="https://www.sqlite.org/news.html">here</a>
</dd>
<dt>Support for seconds editing in <a href="classWt_1_1WTimePicker.html#a4d19d3ad8bdf0a9a3e35d84f3d298994">WTimePicker</a></dt>
<dd>WTimePicker was missing the seconds, we've also added the setSecondStep() method.
</dd>
<dt><a href="classWt_1_1WCheckBox.html#a2d741874682e9a683d40527b03615d32">WCheckBox::setPartialStateSelectable()</a></dt>
<dd>Before it was only possible to set the partial state of the WCheckbox when creating the Widget.
We've added a method WCheckBox::setPartialStateSelectable(bool) which will allow the user to select indeterminate state. This is false by default;
</dd>
<dt>New client side connection monitor</dt>
<dd>The <a href="classWt_1_1WApplication.html#ab6ae1117e316f1a7b31449aaeb83c9cf">WApplication::setConnectionMonitor()</a> method will let the user register a Javascript object that will be notified on connection changes (connection, disconnection, websockets enabled/disabled..)
The monitor will trigger the onChange method of the provided Javascript object</dd>
<dt>Support for custom HTML tags for a widgets</dt>
<dd>We've added <a href="classWt_1_1WWebWidget.html#adf6034e0e715138cae479eae6e324ce6">WWebWidget::setHtmlTagName()</a> that will change the current html tag instead of using the one chosen by Wt by default. This allows the user to create widgets that are not provided by Wt, such as for example semantic tags.
</dd>
<dt>Wt::Dbo: allow to forward declare related classes</dt>
<dd>It is now possible to forward declare all classes that are being referenced in a <a href="group__dbo.html#gaa3de862f9544c4d30b8cbcac4b50feba">belongsTo()</a>, <a href="group__dbo.html#ga00a060d5f4764f673948989f21837548">hasOne()</a> or <a href="group__dbo.html#ga570b71f937c991b000b9db01b327a363">hasMany()</a> relation, helping to reduce the compile time pain of Wt::Dbo.</dd>
</dl>
<hr>
<h2>Release 3.3.4 (Mar 25, 2015)</h2>
<p>
This release has a focus on bug fixes but also one or two new features,
of which the following are the most notable:
</p>
<dl>
<dt>
Support for dedicated session processes with wthttp connector.
</dt>
<dd>
Until now, only the FastCGI connector allowed the use of dedicated
processes for individual sessions, by spawning a new process for
each new session. This functionality has also been added to the
wthttp connector. In this implementation, the manager process will
act as a reverse proxy to the dedicated session processes.
This has as major benefit that there is no longer a choice between
dedicated session processes on the one hand (supported by FastCGI)
and support for WebSockets on the other hand (supported by the
built-in httpd). In fact, there remains little reason to prefer
FastCGI over the built-in httpd: in those situations where you
want a proper http server as a front-end, you can still use
HAproxy or NGINX (or Apache, if you must) as a reverse proxy to
wthttp.
</dd>
<dt>
<a href="classWt_1_1WIdentityProxyModel.html">WIdentityProxyModel</a>
</dt>
<dd>
This new proxy model simply forwards the structure of the source
model, without any transformation, and can be used for
implementing proxy models that reimplement data(), but retain all
other characteristics of the source model.
</dd>
<dt>
<a href="classWt_1_1Chart_1_1WAbstractChart.html#ac895fb1d1437f51629b49246eda66e3d">Chart::WAbstractChart::setAutoLayoutEnabled()</a>
</dt>
<dd>
Until now, you were responsible for configuring the padding around
the chart area to accomodate for axis labels, titles, and
legend. While this is still the default behaviour, we added an
option to let the chart derive the required padding (using
approximate font-metrics available server-side).
</dd>
<dt>
<a href="classWt_1_1Chart_1_1WCartesianChart.html#a1c97590b1bd4ee9324822967d6e72333">Chart::WCartesianChart::setAxis()</a>
</dt>
<dd>
Whereas previously a chart axis was a "value class", it is now a
proper polyymorphic class, and you can provide your own
implementation. In this way you can customize things like for
example label strings.
</dd>
<dt>
Several new features in the 3D charts library.
</dt>
<dd>
<ul>
<li><a href="classWt_1_1Chart_1_1WAbstractDataSeries3D.html#a0ac582c98fe58f36e0d60f11b5627656">
setPointSprite()</a>: ability to define sprites for drawing
a data series</li>
<li><a href="classWt_1_1Chart_1_1WAbstractGridData.html#a8f99da2ab56c80de400c90992c35f882">pickSurface()</a>:
find out which points on a surface are under a given pixel</li>
<li><a href="classWt_1_1Chart_1_1WAbstractGridData.html#afc0509b2dff1fa8dbb970266de21f7db">pickBar()</a>:
find out which points on a bar on are under a given pixel.</li>
<li><a href="classWt_1_1Chart_1_1WAbstractGridData.html#a09c065c802ff9b21d3c2a543e48f58b2">
setIsoLevels()</a>:
draw iso lines (on the ground plane of the chart) corresponding
to selected z values.</li>
<li><a href="classWt_1_1Chart_1_1WAbstractGridData.html#ad74945761f9bfcc2ced42487468c5480">
setClippingLinesEnabled()</a>:
ability to clip and optionally draw clipping planes
</li>
<li>
<a href="classWt_1_1Chart_1_1WCartesian3DChart.html#a8adb0ca981382e3e1435fe8e7fcf1d6e">
setIntersectionsEnabled()</a>:
ability to draw surface-surface intersection lines.
</li>
</ul>
</dd>
</dl>
<hr>
<h2>Release 3.3.3 (May 27, 2014)</h2>
<p>
This release has a focus on bug fixes but also one or two new features:
</p>
<dl>
<dt>
Improved Meta header support.
</dt>
<dd>
Because WApplication meta header API was restricted to only work
in certain circumstances, we have now added the ability to define
meta headers (with the option to apply them to specific user agents)
also in the configuration file.
</dd>
<dt>
<a href="classWt_1_1WWidget.html#ab4086c221a56e81dd067be47303b5862">WWidget::setDeferredToolTip()</a>
</dt>
<dd>
This function is an alternative to setToolTip(), useful when a
tooltip text is not trivial to fetch or create. Using this
function, the tool tip (HTML) text can now be loaded on-demand
instead of needing to be preset on (each) widget. This also works
for tooltips set from a WAbstractItemModel using the
new <a href="group__modelview.html#ga1d77c4de293aebfacbdde124de06b8b0">ItemHasDeferredTooltip</a>
item flag.
</dd>
<dt>
<a href="classWt_1_1WLineEdit.html#ae599502e317ed79d5a1a54dae12d3d10">WLineEdit::setInputMask()</a>
</dt>
<dd>
Support for input masks was added, which guides the user to enter
data in the correct format.
</dd>
</dl>
<hr>
<h2>Release 3.3.2 (March 12, 2014)</h2>
<p>
This release has a focus on bug fixes and a few larger new developments.
</p>
<h3>A) New classes:</h3>
<dl>
<dt>
<a href="classWt_1_1Chart_1_1WCartesian3DChart.html">3D Charts
(Chart::WCartesian3DChart, ...)</a>
</dt>
<dd>
A 3D charting library was added, based on
<a href="classWt_1_1WGLWidget.html">WGLWidget</a>, and integrated
with the existing 2D charting framework.
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1JsonSerializer.html">Dbo::JsonSerializer</a>
</dt>
<dd>
This is a utility which serializes Dbo objects (including
relations) to JSon, leveraging the same persist() function used
for serialization to the database.
</dd>
</dl>
<h3>B) Main improvements:</h3>
<dl>
<dt>
<a href="classWt_1_1WBootstrapTheme.html">WBootstrapTheme</a>
</dt>
<dd>
Support for bootstrap version 3 was added, so now you have the
choice between botstrap version 2 or 3. Needless to say, you
should probably target version 3 for new development work if you
can live with its restricted browser support.
</dd>
<dt>
<a href="classWt_1_1WGLWidget.html">WGLWidget</a>
</dt>
<dd>
Next to the existing client-side WebGL-based implementation, a
server-side OpenGL-based implementation was added for fallback
scenarios where WebGL is not available, or when scene complexity
is so big that a server-side solution is simply better performing
because of lower bandwidth needed.
</dd>
<dt>
<a href="classWt_1_1WRasterImage.html">WRasterImage</a>
</dt>
<dd>
Next to the GraphicsMagick-based implementation, a skia-based
implementation has been added (which provides much higher
performance most notably on Windows platforms).
</dd>
<dt>
<a href="classWt_1_1WString.html">WString</a>
</dt>
<dd>
Until now, Wt defaults to the C++ global locale for conversion
between a string literal (std::string, const char *) and
WString. In practice, UTF-8 is an (increasingly) better choice
since UTF-8 is a pragmatic encoding covering the entire Unicode
range, and the encoding used by the library throughout. We've now
added a setDefaultEncoding() function which can be used to
configure the default encoding as UTF-8.
</dd>
<dt>
wthttp HTTP/WebSockets front-end server
</dt>
<dd>
We've given the http front-end a much needed overhaul, making it
deal better with long-lived connections typical for WebSockets
applications, and fix some nasty issues at the same time.
We also took the opportunity to optimize its performance by
reducing the number of system calls for writing request
responses, and by avoiding memory allocations during request parsing.
</dd>
</dl>
<h3>C) Non-backwards compatible changes</h3>
<dl>
<dt>
<a href="classWt_1_1WDatePicker.html">WDatePicker</a>,
<a href="classWt_1_1WDateEdit.html">WDateEdit</a>
</dt>
<dd>
The date pickers will now default to interpreting a single click
as a date selection and also closing the calendar.
</dd>
</dl>
<hr>
<h2>Release 3.3.1 (October, 16 2013)</h2>
<p>
This release has a focus on bug fixes and other cleanups after the big
changes that went into 3.3.0.
</p>
<h3>A) New classes:</h3>
<dl>
<dt>
<a href="classWt_1_1WLocalDateTime.html">WLocalDateTime</a>
</dt>
<dd>
So far, the library only provided date/time classes that dealt with
UTC time (or that at least is the intended use). In this release
we have added functionality to also deal with date's in a specific
time zone, which includes this new type as well as improvements in
WDateTime to convert to local date time, and time zone information
in WEnvironment and WLocale.
</dd>
</dl>
<h3>B) Main improvements:</h3>
<dl>
<dt>
<a href="classWt_1_1WComboBox.html">WComboBox</a>
</dt>
<dd>
The combo box now interprets LevelRole data to display headers
(using HTML <optgroup< elements). Another improvement is
that now the combobox saves its single selection while the model
is updated.
</dd>
<dt>
<a href="classWt_1_1WDialog.html">WDialog</a>
</dt>
<dd>
Modal dialogs can now be created and destroyed in any order
without confusing the 'silk screen'. We now also consistently
interpret an enter press in the dialog to invoke the default
button added to the dialog footer (if there is one).
</dd>
<dt>
<a href="classWt_1_1WMessageBox.html">WMessageBox</a>
</dt>
<dd>
Several improvements include the ability to indicate what buttons
are the default and escape buttons with setDefaultButton() or
button->setDefault() and setEscapeButton(), and the (long overdue)
implementation of icons!
</dd>
<dt>
<a href="classWt_1_1WTextEdit.html">WTextEdit</a>
</dt>
<dd>
We've added support for TinyMCE 4.
</dd>
<dt>
<a href="classWt_1_1Signal.html">Signal</a>
</dt>
<dd>
For boost versions 1.52 or later, we now support the
Boost.Signals2 library for the signals implementation.
</dd>
<dt>
<a href="namespaceWt_1_1Render.html">Render library</a>
</dt>
<dd>
We've added a CSS style sheet parser which will parse and apply
style rules in <style> blocks (or loaded through the API),
and expanded CSS support to much improvemed table rendering
(including border-collapse border model and repeated table
headers), relative/absolute positioning, and page-break-before/after
support.
</dd>
<dt>
<a href="classWt_1_1Auth_1_1AbstractUserDatabase.html">Auth::AbstractUserDatabase</a>
</dt>
<dd>
A setIdentity() method was added to modify an existing identity
(e.g. username) and updateAuthToken() was added to update an
existing token (e.g. keeping the expiration time but changing the
hash).
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1Query.html">Dbo::Query</a>
</dt>
<dd>
Added a reset() function which resets previous bound arguments.
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1QueryModel.html">Dbo::QueryModel</a>
</dt>
<dd>
The model now implements toRawIndex() and fromRawIndex() methods to
allow selection to persist across layout changes (e.g. resorting).
</dd>
<dt>
<a href="group__json.html">Wt::Json (JSON library)</a>
</dt>
<dd>
We've added serialization functions to complement the parsing API.
</dd>
<dt>
<a href="group__mail.html">Wt::Mail (SMTP library)</a>
</dt>
<dd>
We've added attachment support, and optional indication of the local
sender date.
</dd>
</dl>
<h3>C) Non-backwards compatible changes</h3>
<dl>
<dt>
<a href="classWt_1_1WDate.html">WDate</a>,
<a href="classWt_1_1WDateTime.html">WDateTime</a>
<a href="classWt_1_1WTime.html">WTime</a>
</dt>
<dd>
We've deprecated the exceptions (Invalid[Date][Time]Exception)
that were thrown by these classes when one attempted to compute or
use an 'invalid' value. These exceptions are no longer thrown.
Instead, we now documented what value
(usually 'null') is returned when one attempts to do operations on
such a date/time class, which makes the behaviour more consistent
with how Qt's equivalent classes behave.
</dd>
<dt>
<a href="classWt_1_1WMessageBox.html">WMessageBox</a></dt>
<dd>
The buttons() method has been renamed to standardButtons(), and
buttons() now return the actual list of added buttons.
</dd>
</dl>
<hr>
<h2>Release 3.3.0 (April, 8 2013)</h2>
<p>
This release focusses on a reorganization of Wt's theme
infrastructure, with the objective of
supporting <a href="http://twitter.github.com/bootstrap/">Twitter's
Bootstrap CSS framework</a> as a new theme. At the same time we've
added a number of widgets for which Twitter Bootstrap provides
styling.
</p>
<p>It is our intention to support the Bootstrap theme (or more
specifically, the Bootstrap class names) alongside the themes we
already supported (which are based on our own class names). Ignoring
what Bootstrap brings, you should be able to upgrade to this release
without too much trouble, although you may need to adapt some CSS
stylesheets as we did reorganize a number of things which were
required for Bootstrap and were a good idea for our own CSS
stlesheets too.</p>
<h3>A) New classes:</h3>
<dl>
<dt>
<a href="classWt_1_1WTheme.html">WTheme</a>,
<a href="classWt_1_1WCssTheme.html">WCssTheme</a>,
<a href="classWt_1_1WBootstrapTheme.html">WBootstrapTheme</a>,
</dt>
<dd>
Theme support classes for Wt. The role of a theme is to:
<ul>