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2013
11-27

Qt中的Webkit

The QtWebKit module provides a web browser engine as well as classes to render and interact with web content.
QtWebKit模块提供了一个web浏览器引擎同时也提供了能够渲染与作用于网页内容的类。

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提供了一个很容易吧万维网内容嵌入QT应用的浏览器引擎。web内容也很容易被嵌入到本地控件中。

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.
QtWebkit能够渲染HTMl语言,也可渲染XHTML与SVG,实验css设计界面与Javascript进行脚本编程。

A bridge between the JavaScript execution environment and the Qt object model makes it possible for custom QObjects to be scripted. For detailed documentation see The QtWebkit Bridge. 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 contenteditable attribute on HTML elements.
QtWebKit has been enhanced to become more attractive on the mobile front as well. For more information see QtWebKit Goes Mobile.
QtWebKit is based on the Open Source WebKit engine. More information about WebKit itself can be found on the WebKit Open Source Project Web site.
Including In Your Project
To include the definitions of the module’s classes, use the following directive:

To link against the module, add this line to your qmake .pro file:

Notes
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 src/3rdparty/webkit/Source/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 Qt for Embedded Linux Requirements document for more information.
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.

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 findAllElements() and 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.

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作者:Jianchihu
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