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ReleaseNotes.html
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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 3.3.4 (Mar 25, 2015)</h2>
<p>
This release has a focus on bug fixes but also one or two new 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 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>
<li>Load the CSS stylesheets for a new session</li>
<li>Annotate newly created widgets with appropriate style
classes</li>
</ul>
</dd>
<dt>
<a href="classWt_1_1WDateEdit.html">WDateEdit</a>
</dt>
<dd>
Functionally almost the same as a WDatePicker, this class
specializes WLineEdit and is thus a WFormWidget, making it much
easier to use in WTemplateFormView.
</dd>
<dt>
<a href="classWt_1_1WLocale.html">WLocale</a>
</dt>
<dd>
This class supports localization for number formatting and
extends the simple localization support we had in the previous
versions of Wt (which as only effect had the selection of
a different language for the resource bundles). It's main
added value of native C++ support for localization is that it
also affects client-side handling and parsing of number values,
i.e. in <a href="classWt_1_1WIntValidator.html">WIntValidator</a> and
<a href="classWt_1_1WDoubleValidato.htmlr">WDoubleValidator</a>.
</dd>
<dt>
<a href="classWt_1_1WNavigationBar.html">WNavigationBar</a>
</dt>
<dd>
A navigation bar styles a menu as a typical top-level bar
(currently only styled in the Bootstrap Theme).
</dd>
<dt>
<a href="classWt_1_1WPopupWidget.html">WPopupWidget</a>
</dt>
<dd>
A base class to simplify the creation of popup widgets that
typically assist in editing or provide circumstancial information
for another widget.
</dd>
<dt>
<a href="classWt_1_1WSplitButton.html">WSplitButton</a>
</dt>
<dd>
A split button, which combines a button and a popup menu
(currently only styled in the Bootstrap Theme).
</dd>
<dt>
<a href="classWt_1_1WToolBar.html">WToolBar</a>
</dt>
<dd>
A button tool bar (currently only styled in the Bootstrap Theme)
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1backend_1_1MySQL.html">Dbo::MySQL</a>
</dt>
<dd>
A MariaDB/MySQL backend for Wt::Dbo. This is based on the work
from Paul Harrisson who maintained this backend so far outside the
Wt distribution. The backend has been designed for MariaDB, but
should work fine for MySQL as well.
</dd>
</dl>
<h3>B) Main improvements:</h3>
<dl>
<dt>
<a href="classWt_1_1Mail_1_1Message.html">Mail::Message</a>
</dt>
<dd>
Added API support for additional SMTP headers.
</dd>
<dt>
<a href="classWt_1_1WDatePicker.html">WDatePicker</a>,
<a href="classWt_1_1WSuggestionPopup.html">WSuggestionPopup</a>
</dt>
<dd>
The setGlobalPopup() functionality has been deprecated and does no
longer have any effect, since a new improved algorithm is being
used to anchor the popup to the DOM which no longer requires this
workaround.
</dd>
<dt>
<a href="classWt_1_1WDialog.html">WDialog</a>
</dt>
<dd>
Addition of a footer() method that returns a container for dialog
footer elements, typically buttons.
</dd>
<dt>
<a href="classWt_1_1WFormModel.html">WFormModel</a>
</dt>
<dd>
Addition of a validator() function that returns the validator for
a field set using setValidator(),
</dd>
<dt>
<a href="classWt_1_1WGLWidget.html">WGLWidget</a>
</dt>
<dd>
Support for binary transfers which avoids serialization and
deserialization of floats to text.
</dd>
<dt>
<a href="classWt_1_1WPushButton.html">WPushButton</a>
</dt>
<dd>
A push button can now act as a toggle button, using setCheckable()
and related API (currently only styled in the Bootstrap Theme) and
can be linked to a popup menu using setMenu().
</dd>
<dt>
<a href="classWt_1_1WStackedWidget.html">WStackedWidget</a>
</dt>
<dd>
When switching between current widgets, the stacked widget will
now record and restore the current scroll position, providing a
much improved user experience when using the stacked widget for
the 'main' contents of an application.
</dd>
<dt>
<a href="classWt_1_1WStringListModel.html">WStringListModel</a>
</dt>
<dd>
Full support was added for storing data of all roles, lifting the
requirement to use another model such as WStandardItemModel for
simple MVC widgets like WComboBox or WSuggestionPopup simply to be
able to store UserRole data.
</dd>
<dt>
<a href="classWt_1_1WTemplate.html">WTemplate</a>
</dt>
<dd>
Added a new standard function (Functions::block) which allows the
definition and use of a macro block inside a placeholder, which is
in particular useful for forms which have repetitive formatting
for each field.
</dd>
<dt>
<a href="classWt_1_1WTemplateFormView.html">WTemplateFormView</a>
</dt>
<dd>
Several API improvements: A new setFormWidget() allows the
definition of the form widget for editing a field which
is a more useful alternative compared to reimplement
createFormWidget(). It also allows the optional
definition of functions to update the view/model values, which
avoids the need for specializing updateViewField() and
updateModelField() these latter two functions have been deprecated
in favour of two new functions updateViewValue() and
updateModelValue() which only update the value but not other
aspects such as visibility, validation state, or messages.
</dd>
<dt>
Built-in httpd improvements
</dt>
<dd>
A redundant copy operation of the response generated and sent by
Wt has been removed, using scatter-gather I/O implemented by
boost::asio instead.
</dd>
</dl>
<h3>C) Non-backwards compatible changes</h3>
<dl>
<dt>
<a href="classWt_1_1WMenuItem.html">WMenuItem</a>
</dt>
<dd>
While in previous version of Wt, this class was only a data class
that held the information related to an item, in 3.3.0 we modified
this so that this class represents the widget itself. If you were
redefining protected methods to customize the widget
(i.e. createItemWidget() and updateItemWidget()), then this will no
longer work as expected. The new system should be easier to
customize (since you can simply specialize WMenuItem itself).
In addition, we've simplified the rendering of a menu item so that
a redundant layer of spans (or div's) has been removed. It makes
the menu more consistent with the way CSS designers expect a menu
to rendered, and this was done (you can guess the theme of this
release by now ?) to be compatible with bootstrap's CSS styles.
</dd>
<dt>
<a href="classWt_1_1WApplication.html">WApplication::locale()</a>
</dt>
<dd>
This now returns a WLocale object instead of the string
designation of the locale (which you can query by calling name())
on the locale object.
</dd>
<dt>
<a href="classWt_1_1WCalendar.html">WCalendar</a>
</dt>
<dd>
The markup for this class has changed, and thus customized CSS
will need to be updated.
</dd>
<dt>
<a href="classWt_1_1WMenuItem.html">WPopupMenuItem</a>
</dt>
<dd>
The popup menu item class has been merged with WMenuItem (and
WPopupMenu is now a specialized WMenu). This should not have
noticable API changes, except for the changes in markup and CSS
documented above.
</dd>
<dt>
<a href="classWt_1_1WTreeNode.html">WTreeNode</a>,
<a href="classWt_1_1WTreeTable.html">WTreeTable</a>
<a href="classWt_1_1WTreeView.html">WTreeView</a>
</dt>
<dd>
The markup for tree rendering has been changed (to using nested
unordered list instead of nested tables), and thus customized CSS
will need to be updated. The only API consequence is that
WTreeNode::labelArea() is no longer returning a WTableCell but
instead a WContainerWidget.
</dd>
<dt>
<a href="classWt_1_1WTreeView.html">WTreeView</a>,
<a href="classWt_1_1WTableView.html">WTableView</a>
</dt>
<dd>
Event handling (clicked(), doubleClicked(), ... ) has been
generalized: events that are not generated on an item (but for
example in empty space below the items) will now also
generate these events, but then with an invalid model index.
You may thus need to adapt current code to check whether the model
index that is returned is valid.
</dd>
</dl>
<hr>
<h2>Release 3.2.3 (November, 1 2012)</h2>
<p>
This release contains mostly bug fixes and one new feature: a payment
processing API.
</p>
<h3>A) New namespaces:</h3>
<dl>
<dt>
<a href="group__payment.html">Wt::Payment (payment handling)</a>
</dt>
<dd>
This namespace contains services and back-end classes for dealing
with online payment brokers. At the moment there is support for
PayPal's Express Checkout service.
</dd>
</dl>
<h3>B) Main improvements:</h3>
<dl>
<dt>
Layout improvements.
</dt>
<dd>
<p>
If you had massive trouble migrating to 3.2.2 because of the
layout rewrite, then you'll appreciate the efforts we've made to
make the layout algorithms in 3.2.3 much more robust and
consistent.
</p>
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1QueryModel.html">Dbo::QueryModel</a>:
added a mechanism for stable row data.
</dt>
<dd>
<p>
A common nuisance when working with the QueryModel (which
retrieves data from the database as needed), is that concurrent
database modifications such as insertions of new data, may
interfere with the model's mapping of rows to objects (this is
in fact a common problem with most ORM's indeed). This mapping
may be important, especially when you want to process the user's
selection of one or more rows selected by the user, in e.g. a
table view. We've added a mechanism to assure that one can
request the model for data at a given row, which is guaranteed
to be the same row that has been previously retrieved, using the
stableResultRow() method. It works by default for simple queries
(returning data from one table), but can be easily customized
for more complex queries.
</p>
</dd>
<dt>
<a href="namespaceWt_1_1Render.html">Render library:</a>
improved support for %-based block sizes and table rendering
</dt>
<dd>
<p>
Support was added for %-based sizes for block widths and table
cell widths. In addition, table rendering in Wt::Render has been
improved to support repeating headers (<thead> sections)
for multi-page tables, and explicit page breaks (using the css
page-break-after/before properties).
</p>
</dd>
</dl>
<h3>C) Non-backwards compatible changes</h3>
<dl>
<dt>
<a href="classWt_1_1Dbo_1_1backend_1_1Sqlite3.html">Dbo::backend::Sqlite3</a>
</dt>
<dd>
<p>We've changed the implementation of the storage ISO8601AsText
format for time stamps (datetime). In the new, corrected,
implementation, we generate dates using 'T' as the separator
between date and time (as mandated by ISO8601), while the old
behaviour used a space (' ') instead as the
separator. Sqlite3 supports either format equally. This may
however break some applications which use queries for an exact
date (or a date comparison), as the results may be affected.
</p>
<p> The old behaviour is still available as PseudoISO8601AsText,
which can be configured using
<tt>connection.setDateTimeStorage(Wt::Dbo::SqlDateTime,
Wt::Dbo::backend::Sqlite3::PseudoISO8601AsText)</tt>
</p>
</dd>
<hr>
<h2>Release 3.2.2 (July, 23 2012)</h2>
<p>
This release contains mostly bug and feature improvements, but
also a rewrite of the layout managers in Wt (WBoxLayout and
WGridLayout), and this comes with some changes in (in most cases
previously undefined) behaviour.
</p>
<h3>A) New classes:</h3>
<dl>
<dt>
<a href="classWt_1_1WSslInfo.html">WSslInfo</a>
</dt>
<dd>
Class containing information on a client-side certificate that may
have been configured for a SSL connection, and which can be used
for authentication (accessible from
<a href="classWt_1_1WEnvironment.html">WEnvironment</a>).
</dd>
<dt>
<a href="classWt_1_1Dbo_1_1weak__ptr.html">Wt::Dbo::weak_ptr</a>
</dt>
<dd>
A weak variant of Wt::Dbo::ptr which is used to implement
One-to-One relations (see also
<a
href="group__dbo.html#ga00a060d5f4764f673948989f21837548">Wt::Dbo::hasOne()
</a>).
</dd>
</dl>
<h3>B) Main improvements:</h3>
<dl>
<dt>
Rewrite of <a href="classWt_1_1WLayout.html">WBoxLayout, WGridLayout</a>
</dt>
<dd>
<p>
The layout managers have been reimplement, to address various
issues with the old implementation, including API (in particular the wonked
side-effects of AlignTop | AlignJustify) inconsistencies and bugs.
</p>
<p>The new implementation no longer uses tables when JavaScript
is available, but instead using JavaScript-based layout with
absolute positioning. The table-based implementation is still kept
for plain HTML sessions (and progressive bootstrap). The code now
uses exactly the same layout logic for both horizontal and
vertical layout (but giving precedence to horizontal layout) and
should be much more consistent (and perhaps also more
performant). However, because of the many complexities and
problems with the old code (inconsistent behaviour), you may see
issues while upgrading. Please see the "Non-backwards compatible
changes" below for hints on how to deal with this.</p>
</dd>
<dt>
<a href="classWt_1_1WAbstractItemView.html">WAbstractItemView</a>
</dt>
<dd>
<p>
A drag & drop mime-type can now be specified on a per-item
basis using a new <a
href="group__modelview.html#ga0ae864e12320f9f89172735e075ed068">ItemDataRole</a>,
and the mime-type for the entire selection is computed
from these individual mime-types.
</p>
</dd>
<dt>
<a href="classWt_1_1WInteractWidget.html">WInteractWidget</a>
</dt>
<dd>
A new method <a href="classWt_1_1WInteractWidget.html#a60423e777cffa89e6d1373fd25754099">setMouseOverDelay()</a> allows to specify a delay for
generating the mouseWentOver() event.
</dd>
<dt>
<a href="classWt_1_1Auth_1_1AbstractUserDatabase.html">Auth::AbstractUserDatabase</a>
</dt>
<dd>
A new method <a href="classWt_1_1Auth_1_1AbstractUserDatabase.html#a5067e569748cfad8c3356735a33aa10f">deleteUser()</a> was added, which deletes a user and all
related authentication information.
</dd>
<dt>
<a href="classWt_1_1Chart_1_1WCartesianChart.html">Chart::WCartesianChart</a>
</dt>
<dd>
A new method <a href="classWt_1_1Chart_1_1WCartesianChart.html#aa6c394c4d9a801d088b7b02c3fd66b28">setAxisPadding()</a> was added, which configures the
amount of adding between the chart area and the axes.
</dd>
<dt>
<a href="classWt_1_1Chart_1_1WDataSeries.html">Chart::WDataSeries</a>
</dt>
<dd>
A new method <a href="classWt_1_1Chart_1_1WDataSeries.html#ab0dbcd9bcbc0f39a042eb36aa930def4">setCustomMarker()</a> was added which allows the use of a
user-defined path for the markers. A new role
MarkserScaleFactorRole was added which allows overriding the
marker size based on item model data.
</dd>
</dl>
<h3>C) Non-backwards compatible changes</h3>
<dl>
<dt>
<a href="classWt_1_1WLayout.html">WBoxLayout, WGridLayout</a>
</dt>
<dd>
While migrating old code to this version, here are some tips:
<ol>
<li><p>Alignment flags</p>
<p>Previously, specifying an alignment for a widget in a
layout, or for the layout when set to a container, had a double
meaning. Not only would it implement the given alignment but also
revert to passively letting HTML layout decide the layout of the
contents, and adjust the parent (layout respectively container)
accordingly. This had all kinds of side effects such as not
propagating the size of layout-size-aware widgets and quirks in
the vertical alignment.</p>
<p><a href="classWt_1_1WContainerWidget.html#aff9884c8efdf90974077e96bcb1701db">WContainerWidget::setLayout(layout, alignment)</a> has been
deprecated and will be removed from a future release. This call
was almost always used to let the parent container resize to fit
the size of the contained children, instead of fitting children
in the parent container. This behaviour is now
automatically deduced based on an (empty) size of the parent
container. In case this heuristic does not work, then setting a
non-0 maximum size on the container using <a href="classWt_1_1WWebWidget.html#a9b83805a5b8090d296ae4b5939fc9d11">setMaximumSize()</a> will
act as a trigger, with the added benefit that the parent will only
be allowed to resize up to a specified maximum size.</p>
<p>An alignment specified in
<a href="classWt_1_1WBoxLayout.html#a7c1ec58e25d0b7add93f5f4342844db6">W(Box/Grid)Layout::addWidget(widget, stretch, alignment)</a> now
purely affects the alignment but has no other side effects. The
perferred and minimum sizes of a child widget or layout is now
always taken into account.</p>
</li>
<li><p>Child item sizes</p>
<p>The layout algorithm is now implemented entirely in
JavaScript, and is more gentle when dealing with a combination
of cells (or columns/rows) that have a stretch factor and others
that don't. Previously, a minimum (or fixed) size would be used
to layout items that do not have a stretch factor. This had for
example as a consequence that a WText would be narrowed down to its
minimum width by using word wrapping throughout. Now, the
preferred size is used for a child item, and shrinking to a minimum
size only if necessary.</p>
<li><p>Progressive bootstrap</p>
A layout in the first page of an application rendered using
progressive bootstrap will no longer fully upgrade to a full
JavaScript version, but will result in a hybrid (between
table-based and JavaScript-based). If it doesn't work out as you'ld
expect, then you should reconsider the use of progressive bootstrap,
or the use of a layout manager in your first page.
</li>
</ol>
</dd>
</dl>
<hr>
<h2>Release 3.2.1 (March 16, 2012)</h2>
<p>
This release contains mostly bug and feature improvements.
</p>
<h3>A) New classes:</h3>
<dl>
<dt>
<a href="classWt_1_1WFormModel.html">WFormModel</a>
</dt>
<dd>
A model class for forms. These models are used in Wt::Auth as the
basis for RegistrationModel and AuthModel, and allow a more
straight-forward customization of the underlying behavior of these
forms.
</dd>
<dt>
<a href="classWt_1_1WReadOnlyProxyModel.html">WReadOnlyProxyModel</a>
</dt>
<dd>
A proxy model class which allows to share a source model
read-only between multiple sessions.
</dd>
<dt>
<a href="classWt_1_1WTemplateFormView.html">WTemplateFormView</a>
</dt>
<dd>
A WTemplate-based standard view implementation that works in conjunction