Qt 5.9 | QWebPluginFactory

Qt 5.9.1 Reference Documentation

# QWebPluginFactory Class

The QWebPluginFactory class is used to embed custom data types in web pages. More...

Header: | #include <QWebPluginFactory>
qmake: | QT += webkitwidgets
Since: | Qt 4.4

- List of all members, including inherited members

## Public Types

class | MimeType
class | Plugin

## Public Functions

| QWebPluginFactory(QObject *parent = Q_NULLPTR)
virtual | ~QWebPluginFactory()
virtual QObject * | create(const QString &mimeType, const QUrl &url, const QStringList &argumentNames, const QStringList &argumentValues) const = 0
virtual QList<Plugin> | plugins() const = 0
virtual void | refreshPlugins()

## Detailed Description

The QWebPluginFactory class is used to embed custom data types in web pages.

The HTML `<object>` tag is used to embed arbitrary content into a web page, for example:

      <object type="application/x-pdf" data="http://qt.nokia.com/document.pdf" width="500" height="400"></object>

Qt WebKit will natively handle the most basic data types like `text/html` and `image/jpeg`, but for any advanced or custom data types you will need to provide a handler yourself.

QWebPluginFactory is a factory for creating plugins for QWebPage, where each plugin provides support for one or more data types. A plugin factory can be installed on a QWebPage using QWebPage::setPluginFactory().

Note: The plugin factory is only used if plugins are enabled through QWebSettings.

You provide a QWebPluginFactory by implementing the plugins() and the create() methods. For plugins() it is necessary to describe the plugins the factory can create, including a description and the supported MIME types. The MIME types each plugin can handle should match the ones specified in in the HTML `<object>` tag of your content.

The create() method is called if the requested MIME type is supported. The implementation has to return a new instance of the plugin requested for the given MIME type and the specified URL.

The plugins themselves are subclasses of QObject, but currently only plugins based on either QWidget or QGraphicsWidget are supported.

## Member Function Documentation

### QWebPluginFactory::QWebPluginFactory(QObject *parent = Q_NULLPTR)

Constructs a QWebPluginFactory with parent parent.

### `[virtual]` QWebPluginFactory::~QWebPluginFactory()

Destructor.

### `[pure virtual]` QObject *QWebPluginFactory::create(const QString &mimeType, const QUrl &url, const QStringList &argumentNames, const QStringList &argumentValues) const

Implemented in subclasses to create a new plugin that can display content of the MIME type given by mimeType. The URL of the content is provided in url. The returned object should be a QWidget.

The HTML object element can provide parameters through the `<param>` tag. The name and the value attributes of these tags are specified by the argumentNames and argumentValues string lists.

For example:

      <object type="application/x-pdf" data="http://qt.nokia.com/document.pdf" width="500" height="400">
          <param name="showTableOfContents" value="true" />
          <param name="hideThumbnails" value="false" />
      </object>

The above object element will result in a call to create() with the following arguments:

Parameter | Value
--- | ---
mimeType | "application/x-pdf"
url | "http://qt.nokia.com/document.pdf"
argumentNames | "showTableOfContents" "hideThumbnails"
argumentVaues | "true" "false"

Note: Ownership of the returned object will be transferred to the caller.

### `[pure virtual]` QList<Plugin> QWebPluginFactory::plugins() const

This function is reimplemented in subclasses to return a list of supported plugins the factory can create.

Note: Currently, this function is only called when JavaScript programs access the global `plugins` or `mimetypes` objects.

### `[virtual]` void QWebPluginFactory::refreshPlugins()

This function is called to refresh the list of supported plugins. It may be called after a new plugin has been installed in the system.