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QTextDocument Class Reference

The QTextDocument class holds formatted text that can be viewed and edited using a QTextEdit. More...

#include <QTextDocument>

Inherits QObject.

List of all members.

Public Types

Writable Properties

Public Functions

Public Slots

Signals

Static Public Members

Protected Functions


Detailed Description

The QTextDocument class holds formatted text that can be viewed and edited using a QTextEdit.

A text document can be thought of as a list of strings and their associated formats. A format can contain "references" to objects, such as a QTextList, a QTextFrame, or a QTextTable, and these are available using object().

A QTextDocument can be edited programmatically using a QTextCursor.

The layout of a document is determined by the documentLayout(); you can create your own QAbstractTextDocumentLayout subclass and set it using setDocumentLayout() if you want to use your own layout logic. The document's title is available using documentTitle().

You can retrieve the contents of the document using plainText() or html(). If you want the text with format information, or wish to edit the text, use a QTextCursor The text can be searched using the find() functions. If you want to iterate over the contents of the document you can use begin(), end(), or findBlock() to retrieve a QTextBlock that you can query and iterate from.

Undo/redo can be controlled using setUndoRedoEnabled(). undo() and redo() slots are provided, along with contentsChanged(), undoAvailable() and redoAvailable() signals.


Member Type Documentation

enum QTextDocument::FindFlag
typedef QTextDocument::FindFlags

This enum describes the options available to QTextDocument's find function. The options can be OR-red together from the following list:

QTextDocument::FindCaseSensitivelyBy default find works case insensitive. Specifying this option changes the behaviour to a case sensitive find operation.
QTextDocument::FindWholeWordsMakes find match only complete words.

The FindFlags typedef can store a combination of FindFlag values.


Property Documentation

modified : bool

This property holds whether the document has been modified by the user.

Access functions:

See also modificationChanged().

undoRedoEnabled : bool

This property holds whether undo/redo are enabled for this document.

This defaults to true. If disabled the undo stack is cleared and no items will be added to it.

Access functions:


Member Function Documentation

QTextDocument::QTextDocument ( QObject * parent = 0 )

Constructs an empty QTextDocument with the given parent.

QTextDocument::QTextDocument ( const QString & text, QObject * parent = 0 )

Constructs a QTextDocument containing the plain (unformatted) text specified, and with the given parent.

QTextDocument::~QTextDocument ()

Destroys the document.

QTextBlock QTextDocument::begin () const

Returns the document's first text block.

void QTextDocument::contentsChanged ()   [signal]

This signal is emitted whenever the documents content changes, for example, text is inserted or deleted, or formatting is applied.

QTextObject * QTextDocument::createObject ( const QTextFormat & format )   [virtual protected]

Creates and returns a new document object (a QTextObject), based on the given format.

QTextObjects will always get created through this method, so you must reimplement it if you use custom text objects inside your document.

QAbstractTextDocumentLayout * QTextDocument::documentLayout () const

Returns the document layout for this document.

QString QTextDocument::documentTitle () const

Returns the document's title.

QTextBlock QTextDocument::end () const

Returns the document's last text block.

QTextCursor QTextDocument::find ( const QString & expr, const QTextCursor & from, FindFlags options = 0 ) const

Finds the next occurrence of the string, expr, starting at position from, using the given options. Returns a cursor with the match selected if expr was found; otherwise returns a null cursor.

If the from cursor has a selection the search begins after the selection; otherwise from the position of the cursor.

By default the search is case-sensitive, and can match anywhere.

QTextCursor QTextDocument::find ( const QString & expr, int from = 0, FindFlags options = 0 ) const

This is an overloaded member function, provided for convenience. It behaves essentially like the above function.

Finds the next occurrence of the string, expr, starting at position from, using the given options. Returns a cursor with the match selected if expr was found; otherwise returns a null cursor.

If from is 0 (the default) the search begins from the beginning of the document; otherwise from the specified position.

QTextBlock QTextDocument::findBlock ( int pos ) const

Returns the text block that contains the pos-th character.

QString QTextDocument::html () const

Returns the document in HTML format. The conversion may not be perfect, especially for complex documents, due to the limitations of HTML.

bool QTextDocument::isEmpty () const

Returns true if the document is empty; otherwise returns false.

bool QTextDocument::isRedoAvailable () const

Returns true is redo is available; otherwise returns false.

bool QTextDocument::isUndoAvailable () const

Returns true is undo is available; otherwise returns false.

void QTextDocument::modificationChanged ( bool changed )   [signal]

This signal is emitted whenever the content of the document changes in a way that affects the modification state. If changed is true if the document has been modified; otherwise it is false.

For example calling setModified(false) on a document and then inserting text causes the signal to get emitted. If you undo that operation, causing the document to return to its original unmodified state, the signal will get emitted again.

QTextObject * QTextDocument::object ( int objectIndex ) const

Returns the text object associated with the given objectIndex.

QTextObject * QTextDocument::objectForFormat ( const QTextFormat & f ) const

Returns the text object associated with the format f.

QString QTextDocument::plainText () const

Returns the plain text contained in the document. If you want formatting information use a QTextCursor instead.

See also html().

void QTextDocument::redo ()   [slot]

Redoes the last editing operation on the document if redo is available.

void QTextDocument::redoAvailable ( bool b )   [signal]

This signal is emitted whenever redo operations become available (b is true) or unavailable (b is false).

void QTextDocument::setDocumentLayout ( QAbstractTextDocumentLayout * layout )

Sets the document to use the given layout. The previous layout is deleted.

void QTextDocument::setHtml ( const QString & html )

Replaces the entire contents of the document with the given HTML-formatted text in the html string.

The HTML formatting is respected as much as possible, i.e. "<b>bold</b> text" will have the text "bold text" with the first word having a character format with a bold font weight.

See also setPlainText().

void QTextDocument::setPlainText ( const QString & text )

Replaces the entire contents of the document with the given plain text.

See also setHtml().

void QTextDocument::undo ()   [slot]

Undoes the last editing operation on the document if undo is available.

void QTextDocument::undoAvailable ( bool b )   [signal]

This signal is emitted whenever undo operations become available (b is true) or unavailable (b is false).


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Qt 4.0.0-tp1