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/*!
\module QtWebKit
\title QtWebKit Module
\contentspage Qt's Modules
\previouspage QtSvg
\nextpage QtXml
\ingroup architecture
\ingroup modules
\brief An introduction to the QtWebKit module.
\keyword Browser
\keyword Web Browser
\since 4.4
QtWebKit provides a Web browser engine that makes it easy to embed content
from the World Wide Web into your Qt application. At the same time Web
content can be enhanced with native controls.
QtWebKit provides facilities for rendering of HyperText Markup Language
(HTML), Extensible HyperText Markup Language (XHTML) and Scalable Vector
Graphics (SVG) documents, styled using Cascading Style Sheets (CSS) and
scripted with JavaScript.
A bridge between the JavaScript execution environment and the Qt object
model makes it possible for custom QObjects to be scripted. Integration
with the Qt networking module enables Web pages to be transparently loaded
from Web servers, the local file system or even the Qt resource system.
In addition to providing pure rendering features, HTML documents can be
made fully editable to the user through the use of the \c{contenteditable}
attribute on HTML elements.
QtWebKit is based on the Open Source WebKit engine. More information about
WebKit itself can be found on the \l{WebKit Open Source Project} Web site.
The QtWebKit module is part of the \l{Qt Full Framework Edition}, and the
\l{Open Source Versions of Qt}.
\note Building the QtWebKit module with debugging symbols is problematic
on many platforms due to the size of the WebKit engine. We recommend
building the module only in release mode for embedded platforms.
Currently QtWebKit will always be compiled without debugging symbols
when using gcc. Take a look at the last lines of
\c{src/3rdparty/webkit/WebCore/WebCore.pro} if you need to change this.
\note Web site icons, also known as "FavIcons", are currently not supported
on Windows. We plan to address this in a future release.
\note WebKit has certain minimum requirements that must be met on
Embedded Linux systems. See the \l{Qt for Embedded Linux Requirements}
document for more information.
Topics:
\tableofcontents
\section1 Configuring the Build Process
Applications using QtWebKit's classes need to be configured to be built
against the QtWebKit module. The following declaration in a \c qmake
project file ensures that an application is compiled and linked
appropriately:
\snippet webkitsnippets/qtwebkit_build_snippet.qdoc 0
To include the definitions of the module's classes, use the following
directive:
\snippet webkitsnippets/qtwebkit_build_snippet.qdoc 1
\section1 Architecture
The easiest way to render content is through the QWebView class. As a
widget it can be embedded into your forms or a graphics view, and it
provides convenience functions for downloading and rendering web sites.
\snippet webkitsnippets/simple/main.cpp Using QWebView
QWebView is used to view Web pages. An instance of QWebView has one
QWebPage. QWebPage provides access to the document structure in a page,
describing features such as frames, the navigation history, and the
undo/redo stack for editable content.
HTML documents can be nested using frames in a frameset. An individual
frame in HTML is represented using the QWebFrame class. This class includes the
bridge to the JavaScript window object and can be painted using QPainter.
Each QWebPage has one QWebFrame object as its main frame, and the main frame
may contain many child frames.
Individual elements of an HTML document can be accessed via DOM JavaScript
interfaces from within a web page. The equivalent of this API in QtWebKit
is represented by QWebElement. QWebElement objects are obtained using QWebFrame's
\l{QWebFrame::}{findAllElements()} and \l{QWebFrame::}{findFirstElement()}
functions with CSS selector queries.
Common web browser features, defaults and other settings can be configured
through the QWebSettings class. It is possible to provide defaults for all
QWebPage instances through the default settings. Individual attributes
can be overidden by the page specific settings object.
\section1 Netscape Plugin Support
Since WebKit supports the Netscape Plugin API, Qt applications can display
Web pages that embed common plugins, as long as the user has the appropriate
binary files for those plugins installed and the \l{QWebSettings::PluginsEnabled}
attribute is enabled for the application.
The following locations are searched for plugins:
\table
\header \o Linux/Unix \o Windows
\row \o{1,3}
\list
\o \c{.mozilla/plugins} in the user's home directory
\o \c{.netscape/plugins} in the user's home directory
\o System locations, such as
\list
\o \c{/usr/lib/browser/plugins}
\o \c{/usr/local/lib/mozilla/plugins}
\o \c{/usr/lib/firefox/plugins}
\o \c{/usr/lib64/browser-plugins}
\o \c{/usr/lib/browser-plugins}
\o \c{/usr/lib/mozilla/plugins}
\o \c{/usr/local/netscape/plugins}
\o \c{/opt/mozilla/plugins}
\o \c{/opt/mozilla/lib/plugins}
\o \c{/opt/netscape/plugins}
\o \c{/opt/netscape/communicator/plugins}
\o \c{/usr/lib/netscape/plugins}
\o \c{/usr/lib/netscape/plugins-libc5}
\o \c{/usr/lib/netscape/plugins-libc6}
\o \c{/usr/lib64/netscape/plugins}
\o \c{/usr/lib64/mozilla/plugins}
\endlist
\o Locations specified by environment variables:
\list
\o \c{$MOZILLA_HOME/plugins}
\o \c{$MOZ_PLUGIN_PATH}
\o \c{$QTWEBKIT_PLUGIN_PATH}
\endlist
\endlist
\o
\list
\o The user's \c{Application Data\Mozilla\plugins} directory
\o Standard system locations of plugins for Quicktime, Flash, etc.
\endlist
\row
\raw HTML
<th class="qt-style">Mac OS X</th>
\endraw
\row
\o
\list
\o \c{Library/Internet Plug-Ins} in the user's home directory
\o The system \c{/Library/Internet Plug-Ins} directory
\endlist
\endtable
\section1 License Information
This is a snapshot of the Qt port of WebKit. The exact version information
can be found in the \c{src/3rdparty/webkit/VERSION} file supplied with Qt.
Qt Commercial Edition licensees that wish to distribute applications that
use the QtWebKit module need to be aware of their obligations under the
GNU Lesser General Public License (LGPL).
Developers using the Open Source Edition can choose to redistribute
the module under the appropriate version of the GNU LGPL; version 2.1
for applications and libraries licensed under the GNU GPL version 2,
or version 3 for applications and libraries licensed under the GNU
GPL version 2.
\legalese
WebKit is licensed under the GNU Library General Public License.
Individual contributor names and copyright dates can be found
inline in the code.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
\endlegalese
*/
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