Qt 4.3: Q3TextBrowser Class Reference

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# Q3TextBrowser Class Reference
[Qt3Support module]

The Q3TextBrowser class provides a rich text browser with hypertext navigation. More...

     #include <Q3TextBrowser>

This class is part of the Qt 3 support library. It is provided to keep old source code working. We strongly advise against using it in new code. See Porting to Qt 4 for more information.

Inherits Q3TextEdit.

- List of all members, including inherited members

### Properties

- source : QString

- 19 properties inherited from Q3TextEdit
- 10 properties inherited from Q3ScrollView
- 2 properties inherited from Q3Frame
- 6 properties inherited from QFrame
- 56 properties inherited from QWidget
- 1 property inherited from QObject

### Public Functions

- Q3TextBrowser ( QWidget * parent = 0, const char * name = 0 )
- QString source () const

- 51 public functions inherited from Q3TextEdit
- 46 public functions inherited from Q3ScrollView
- 4 public functions inherited from Q3Frame
- 13 public functions inherited from QFrame
- 201 public functions inherited from QWidget
- 29 public functions inherited from QObject
- 12 public functions inherited from QPaintDevice

### Public Slots

- virtual void backward ()
- virtual void forward ()
- virtual void home ()
- virtual void reload ()
- virtual void setSource ( const QString & name )
- void setText ( const QString & txt )

- 60 public slots inherited from Q3TextEdit
- 8 public slots inherited from Q3ScrollView
- 19 public slots inherited from QWidget
- 1 public slot inherited from QObject

### Signals

- void anchorClicked ( const QString & name, const QString & link )
- void backwardAvailable ( bool available )
- void forwardAvailable ( bool available )
- void highlighted ( const QString & link )
- void linkClicked ( const QString & link )
- void sourceChanged ( const QString & src )

- 14 signals inherited from Q3TextEdit
- 5 signals inherited from Q3ScrollView
- 1 signal inherited from QWidget
- 1 signal inherited from QObject

### Protected Functions

- virtual void keyPressEvent ( QKeyEvent * e )

- 6 protected functions inherited from Q3TextEdit
- 17 protected functions inherited from Q3ScrollView
- 5 protected functions inherited from Q3Frame
- 38 protected functions inherited from QWidget
- 7 protected functions inherited from QObject
- 1 protected function inherited from QPaintDevice

### Additional Inherited Members

- 4 static public members inherited from QWidget
- 5 static public members inherited from QObject
- 1 protected slot inherited from QWidget

## Detailed Description

The Q3TextBrowser class provides a rich text browser with hypertext navigation.

This class extends Q3TextEdit (in read-only mode), adding some navigation functionality so that users can follow links in hypertext documents. The contents of Q3TextEdit is set with setText(), but Q3TextBrowser has an additional function, setSource(), which makes it possible to set the text to a named document. The name is looked up in the text view's mime source factory. If a document name ends with an anchor (for example, "`#anchor"`), the text browser automatically scrolls to that position (using scrollToAnchor()). When the user clicks on a hyperlink, the browser will call setSource() itself, with the link's `href` value as argument. You can track the current source by connetion to the sourceChanged() signal.

Q3TextBrowser provides backward() and forward() slots which you can use to implement Back and Forward buttons. The home() slot sets the text to the very first document displayed. The linkClicked() signal is emitted when the user clicks a link.

By using Q3TextEdit::setMimeSourceFactory() you can provide your own subclass of Q3MimeSourceFactory. This makes it possible to access data from anywhere, for example from a network or from a database. See Q3MimeSourceFactory::data() for details.

If you intend using the mime factory to read the data directly from the file system, you may have to specify the encoding for the file extension you are using. For example:

     mimeSourceFactory()->setExtensionType("qml", "text/utf8");

This is to ensure that the factory is able to resolve the document names.

Q3TextBrowser interprets the tags it processes in accordance with the default style sheet. Change the style sheet with setStyleSheet(); see QStyleSheet for details.

If you want to provide your users with editable rich text use Q3TextEdit. If you want a text browser without hypertext navigation use Q3TextEdit, and use Q3TextEdit::setReadOnly() to disable editing. If you just need to display a small piece of rich text use QSimpleRichText or QLabel.

## Property Documentation

### source : QString

This property holds the name of the displayed document.

This is a an empty string if no document is displayed or if the source is unknown.

Setting this property uses the mimeSourceFactory() to lookup the named document. It also checks for optional anchors and scrolls the document accordingly.

If the first tag in the document is `<qt type=detail>`, the document is displayed as a popup rather than as new document in the browser window itself. Otherwise, the document is displayed normally in the text browser with the text set to the contents of the named document with setText().

If you are using the filesystem access capabilities of the mime source factory, you must ensure that the factory knows about the encoding of specified files; otherwise no data will be available. The default factory handles a couple of common file extensions such as `*.html` and `*.txt` with reasonable defaults. See Q3MimeSourceFactory::data() for details.

Access functions:

- QString source () const
- virtual void setSource ( const QString & name )

## Member Function Documentation

### Q3TextBrowser::Q3TextBrowser ( QWidget * parent = 0, const char * name = 0 )

Constructs an empty Q3TextBrowser called name, with parent parent.

### void Q3TextBrowser::anchorClicked ( const QString & name, const QString & link ) `[signal]`

This signal is emitted when the user clicks an anchor. The link is the value of the `href` i.e. the name of the target document. The name is the name of the anchor.

See also linkClicked().

### void Q3TextBrowser::backward () `[virtual slot]`

Changes the document displayed to the previous document in the list of documents built by navigating links. Does nothing if there is no previous document.

See also forward() and backwardAvailable().

### void Q3TextBrowser::backwardAvailable ( bool available ) `[signal]`

This signal is emitted when the availability of backward() changes. available is false when the user is at home(); otherwise it is true.

### void Q3TextBrowser::forward () `[virtual slot]`

Changes the document displayed to the next document in the list of documents built by navigating links. Does nothing if there is no next document.

See also backward() and forwardAvailable().

### void Q3TextBrowser::forwardAvailable ( bool available ) `[signal]`

This signal is emitted when the availability of forward() changes. available is true after the user navigates backward() and false when the user navigates or goes forward().

### void Q3TextBrowser::highlighted ( const QString & link ) `[signal]`

This signal is emitted when the user has selected but not activated a link in the document. link is the value of the `href` i.e. the name of the target document.

### void Q3TextBrowser::home () `[virtual slot]`

Changes the document displayed to be the first document the browser displayed.

### void Q3TextBrowser::keyPressEvent ( QKeyEvent * e ) `[virtual protected]`

The event e is used to provide the following keyboard shortcuts:

Keypress | Action
--- | ---
Alt+Left Arrow | backward()
Alt+Right Arrow | forward()
Alt+Up Arrow | home()

Reimplemented from QWidget.

### void Q3TextBrowser::linkClicked ( const QString & link ) `[signal]`

This signal is emitted when the user clicks a link. The link is the value of the `href` i.e. the name of the target document.

The link will be the absolute location of the document, based on the value of the anchor's href tag and the current context of the document.

See also anchorClicked().

### void Q3TextBrowser::reload () `[virtual slot]`

Reloads the current set source.

### void Q3TextBrowser::setText ( const QString & txt ) `[slot]`

Sets the text to txt.

### void Q3TextBrowser::sourceChanged ( const QString & src ) `[signal]`

This signal is emitted when the mime source has changed, src being the new source.

Source changes happen both programmatically when calling setSource(), forward(), backword() or home() or when the user clicks on links or presses the equivalent key sequences.