QWebFrame Class ReferenceThe QWebFrame class represents a frame in a web page. Далее... #include <QWebFrame> Унаследован от: QObject. Этот класс был введён в Qt 4.4. Открытые типы
Свойства
Открытые функции
Переопределённые открытые функции
Открытые слоты
Сигналы
Дополнительные унаследованные члены
Подробное описаниеThe QWebFrame class represents a frame in a web page. QWebFrame represents a frame inside a web page. Each QWebPage object contains at least one frame, the main frame, obtained using QWebPage::mainFrame(). Additional frames will be created for HTML <frame> or <iframe> elements. A frame can be loaded using load() or setUrl(). Alternatively, if you have the HTML content readily available, you can use setHtml() instead. The page() function returns a pointer to the web page object. See Elements of QWebView for an explanation of how web frames are related to a web page and web view. The QWebFrame class also offers methods to retrieve both the URL currently loaded by the frame (see url()) as well as the URL originally requested to be loaded (see requestedUrl()). These methods make possible the retrieval of the URL before and after a DNS resolution or a redirection occurs during the load process. The requestedUrl() also matches to the URL added to the frame history (QWebHistory) if load is successful. The title of an HTML frame can be accessed with the title() property. Additionally, a frame may also specify an icon, which can be accessed using the icon() property. If the title or the icon changes, the corresponding titleChanged() and iconChanged() signals will be emitted. The zoomFactor() property can be used to change the overall size of the content displayed in the frame. QWebFrame objects are created and controlled by the web page. You can connect to the web page's frameCreated() signal to be notified when a new frame is created. There are multiple ways to programmatically examine the contents of a frame. The hitTestContent() function can be used to find elements by coordinate. For access to the underlying DOM tree, there is documentElement(), findAllElements() and findFirstElement(). A QWebFrame can be printed onto a QPrinter using the print() function. This function is marked as a slot and can be conveniently connected to QPrintPreviewDialog's paintRequested() signal. See also QWebPage. Описание типов-членовenum QWebFrame::RenderLayerThis enum describes the layers available for rendering using render(). The layers can be OR-ed together from the following list:
Описание свойствbaseUrl : const QUrlThis property holds the base URL of the frame, can be used to resolve relative URLs. Это свойство было введено в Qt 4.6. Функции доступа:
contentsSize : const QSizeThis property holds the size of the contents in this frame. Функции доступа:
See also contentsSizeChanged(). focus : const boolReturns true if this frame has keyboard input focus; otherwise, returns false. Это свойство было введено в Qt 4.6. Функции доступа:
icon : const QIconThis property holds the icon associated with this frame. Функции доступа:
See also iconChanged() and QWebSettings::iconForUrl(). requestedUrl : const QUrlThe URL requested to loaded by the frame currently viewed. The URL may differ from the one returned by url() if a DNS resolution or a redirection occurs. Это свойство было введено в Qt 4.6. Функции доступа:
scrollPosition : QPointThis property holds the position the frame is currently scrolled to. Это свойство было введено в Qt 4.5. Функции доступа:
title : const QStringThis property holds the title of the frame as defined by the HTML <title> element. Функции доступа:
See also titleChanged(). url : QUrlThis property holds the url of the frame currently viewed. Setting this property clears the view and loads the URL. By default, this property contains an empty, invalid URL. Функции доступа:
See also urlChanged(). zoomFactor : qrealThis property holds the zoom factor for the frame. Это свойство было введено в Qt 4.5. Функции доступа:
Описание функций-членовvoid QWebFrame::addToJavaScriptWindowObject ( const QString & name, QObject * object )Make object available under name from within the frame's JavaScript context. The object will be inserted as a child of the frame's window object. Qt properties will be exposed as JavaScript properties and slots as JavaScript methods. The interaction between C++ and JavaScript is explained in the documentation of the QtWebKit bridge. If you want to ensure that your QObjects remain accessible after loading a new URL, you should add them in a slot connected to the javaScriptWindowObjectCleared() signal. If Javascript is not enabled for this page, then this method does nothing. The object will never be explicitly deleted by QtWebKit. void QWebFrame::addToJavaScriptWindowObject ( const QString & name, QObject * object, QScriptEngine::ValueOwnership own )Это перегруженная функция. Make object available under name from within the frame's JavaScript context. The object will be inserted as a child of the frame's window object. Qt properties will be exposed as JavaScript properties and slots as JavaScript methods. The interaction between C++ and JavaScript is explained in the documentation of the QtWebKit bridge. If you want to ensure that your QObjects remain accessible after loading a new URL, you should add them in a slot connected to the javaScriptWindowObjectCleared() signal. If Javascript is not enabled for this page, then this method does nothing. The ownership of object is specified using own. QList<QWebFrame *> QWebFrame::childFrames () constReturns a list of all frames that are direct children of this frame. See also parentFrame(). void QWebFrame::contentsSizeChanged ( const QSize & size ) [signal]This signal is emitted when the frame's contents size changes to size. Эта функция была введена в Qt 4.6. See also contentsSize(). QWebElement QWebFrame::documentElement () constReturns the document element of this frame. The document element provides access to the entire structured content of the frame. Эта функция была введена в Qt 4.6. QVariant QWebFrame::evaluateJavaScript ( const QString & scriptSource ) [slot]Evaluates the JavaScript defined by scriptSource using this frame as context and returns the result of the last executed statement. See also addToJavaScriptWindowObject() and javaScriptWindowObjectCleared(). bool QWebFrame::event ( QEvent * e ) [virtual]Переопределено от QObject::event(). QWebElementCollection QWebFrame::findAllElements ( const QString & selectorQuery ) constReturns a new list of elements matching the given CSS selector selectorQuery. If there are no matching elements, an empty list is returned. Standard CSS2 selector syntax is used for the query. Эта функция была введена в Qt 4.6. See also QWebElement::findAll(). QWebElement QWebFrame::findFirstElement ( const QString & selectorQuery ) constReturns the first element in the frame's document that matches the given CSS selector selectorQuery. If there is no matching element, a null element is returned. Standard CSS2 selector syntax is used for the query. Эта функция была введена в Qt 4.6. See also QWebElement::findFirst(). QString QWebFrame::frameName () constThe name of this frame as defined by the parent frame. QRect QWebFrame::geometry () constReturn the geometry of the frame relative to it's parent frame. QWebHitTestResult QWebFrame::hitTestContent ( const QPoint & pos ) constPerforms a hit test on the frame contents at the given position pos and returns the hit test result. void QWebFrame::iconChanged () [signal]This signal is emitted when the icon ("favicon") associated with the frame has been loaded. Смотрите также icon(). void QWebFrame::initialLayoutCompleted () [signal]This signal is emitted when the frame is laid out the first time. This is the first time you will see contents displayed on the frame. Note: A frame can be laid out multiple times. void QWebFrame::javaScriptWindowObjectCleared () [signal]This signal is emitted whenever the global window object of the JavaScript environment is cleared, e.g., before starting a new load. If you intend to add QObjects to a QWebFrame using addToJavaScriptWindowObject(), you should add them in a slot connected to this signal. This ensures that your objects remain accessible when loading new URLs. void QWebFrame::load ( const QUrl & url )Loads url into this frame. Note: The view remains the same until enough data has arrived to display the new url. See also setUrl(), setHtml(), and setContent(). void QWebFrame::load ( const QNetworkRequest & req, QNetworkAccessManager::Operation operation = QNetworkAccessManager::GetOperation, const QByteArray & body = QByteArray() )Loads a network request, req, into this frame, using the method specified in operation. body is optional and is only used for POST operations. Note: The view remains the same until enough data has arrived to display the new content. See also setUrl(). void QWebFrame::loadFinished ( bool ok ) [signal]This signal is emitted when a load of this frame is finished. ok will indicate whether the load was successful or any error occurred. Эта функция была введена в Qt 4.6. See also loadStarted(). void QWebFrame::loadStarted () [signal]This signal is emitted when a new load of this frame is started. Эта функция была введена в Qt 4.6. See also loadFinished(). QMultiMap<QString, QString> QWebFrame::metaData () constReturns the meta data in this frame as a QMultiMap The meta data consists of the name and content attributes of the of the <meta> tags in the HTML document. Например: <html> <head> <meta name="description" content="This document is a tutorial about Qt development"> <meta name="keywords" content="Qt, WebKit, Programming"> </head> ... </html> Given the above HTML code the metaData() function will return a map with two entries:
This function returns a multi map to support multiple meta tags with the same attribute name. Эта функция была введена в Qt 4.5. QWebPage * QWebFrame::page () constThe web page that contains this frame. See also pageChanged(). void QWebFrame::pageChanged () [signal]This signal is emitted when this frame has been moved to a different QWebPage. Эта функция была введена в Qt 4.7. See also page(). QWebFrame * QWebFrame::parentFrame () constReturns the parent frame of this frame, or 0 if the frame is the web pages main frame. This is equivalent to qobject_cast<QWebFrame*>(frame->parent()). See also childFrames(). QPoint QWebFrame::pos () constReturns the position of the frame relative to it's parent frame. void QWebFrame::print ( QPrinter * printer ) const [slot]Prints the frame to the given printer. See also render(). void QWebFrame::render ( QPainter * painter )Render the frame into painter. void QWebFrame::render ( QPainter * painter, const QRegion & clip )Render the frame into painter clipping to clip. void QWebFrame::render ( QPainter * painter, RenderLayer layer, const QRegion & clip = QRegion() )Render the layer of the frame using painter clipping to clip. Эта функция была введена в Qt 4.6. See also print(). QString QWebFrame::renderTreeDump () constReturns a dump of the rendering tree. This is mainly useful for debugging html. void QWebFrame::scroll ( int dx, int dy )Scrolls the frame dx pixels to the right and dy pixels downward. Both dx and dy may be negative. Эта функция была введена в Qt 4.5. See also QWebFrame::scrollPosition. QRect QWebFrame::scrollBarGeometry ( Qt::Orientation orientation ) constReturns the geometry for the scrollbar with orientation orientation. If the scrollbar does not exist an empty rect is returned. Эта функция была введена в Qt 4.6. int QWebFrame::scrollBarMaximum ( Qt::Orientation orientation ) constReturns the maximum value for the scrollbar with orientation orientation, or 0 if no scrollbar is found for orientation. See also scrollBarMinimum(). int QWebFrame::scrollBarMinimum ( Qt::Orientation orientation ) constReturns the minimum value for the scrollbar with orientation orientation. The minimum value is always 0. See also scrollBarMaximum(). Qt::ScrollBarPolicy QWebFrame::scrollBarPolicy ( Qt::Orientation orientation ) constReturns the scrollbar policy for the scrollbar defined by orientation. See also setScrollBarPolicy(). int QWebFrame::scrollBarValue ( Qt::Orientation orientation ) constReturns the current value for the scrollbar with orientation orientation, or 0 if no scrollbar is found for orientation. See also setScrollBarValue(), scrollBarMinimum(), and scrollBarMaximum(). void QWebFrame::scrollToAnchor ( const QString & anchor )Scrolls the frame to the given anchor name. Эта функция была введена в Qt 4.7. QWebSecurityOrigin QWebFrame::securityOrigin () constReturns the frame's security origin. Эта функция была введена в Qt 4.5. void QWebFrame::setContent ( const QByteArray & data, const QString & mimeType = QString(), const QUrl & baseUrl = QUrl() )Sets the content of this frame to the specified content data. If the mimeType argument is empty it is currently assumed that the content is HTML but in future versions we may introduce auto-detection. External objects referenced in the content are located relative to baseUrl. The data is loaded immediately; external objects are loaded asynchronously. Note: This method will not affect session or global history for the frame. See also toHtml() and setHtml(). void QWebFrame::setFocus ()Gives keyboard input focus to this frame. Эта функция была введена в Qt 4.6. See also hasFocus(). void QWebFrame::setHtml ( const QString & html, const QUrl & baseUrl = QUrl() )Sets the content of this frame to html. baseUrl is optional and used to resolve relative URLs in the document, such as referenced images or stylesheets. The html is loaded immediately; external objects are loaded asynchronously. If a script in the html runs longer than the default script timeout (currently 10 seconds), for example due to being blocked by a modal JavaScript alert dialog, this method will return as soon as possible after the timeout and any subsequent html will be loaded asynchronously. When using this method WebKit assumes that external resources such as JavaScript programs or style sheets are encoded in UTF-8 unless otherwise specified. For example, the encoding of an external script can be specified through the charset attribute of the HTML script tag. It is also possible for the encoding to be specified by web server. This is a convenience function equivalent to setContent(html, "text/html", baseUrl). Note: This method will not affect session or global history for the frame. Warning: This function works only for HTML, for other mime types (i.e. XHTML, SVG) setContent() should be used instead. See also toHtml(), setContent(), and load(). void QWebFrame::setScrollBarPolicy ( Qt::Orientation orientation, Qt::ScrollBarPolicy policy )Sets the scrollbar policy for the scrollbar defined by orientation to policy. See also scrollBarPolicy(). void QWebFrame::setScrollBarValue ( Qt::Orientation orientation, int value )Sets the current value for the scrollbar with orientation orientation. The scrollbar forces the value to be within the legal range: minimum <= value <= maximum. Changing the value also updates the thumb position. See also scrollBarValue(), scrollBarMinimum(), and scrollBarMaximum(). void QWebFrame::setTextSizeMultiplier ( qreal factor )Sets the value of the multiplier used to scale the text in a Web frame to the factor specified. See also textSizeMultiplier(). qreal QWebFrame::textSizeMultiplier () constReturns the value of the multiplier used to scale the text in a Web frame. See also setTextSizeMultiplier(). void QWebFrame::titleChanged ( const QString & title ) [signal]This signal is emitted whenever the title of the frame changes. The title string specifies the new title. See also title(). QString QWebFrame::toHtml () constReturns the frame's content as HTML, enclosed in HTML and BODY tags. See also setHtml() and toPlainText(). QString QWebFrame::toPlainText () constReturns the content of this frame converted to plain text, completely stripped of all HTML formatting. See also toHtml(). void QWebFrame::urlChanged ( const QUrl & url ) [signal]This signal is emitted with the URL of the frame when the frame's title is received. The new URL is specified by url. See also url(). |
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