QTextBoundaryFinder

The QTextBoundaryFinder class provides a way of finding Unicode text boundaries in a string. More

Inheritance diagram of PySide2.QtCore.QTextBoundaryFinder

Synopsis

Functions

Detailed Description

QTextBoundaryFinder allows to find Unicode text boundaries in a string, accordingly to the Unicode text boundary specification (see Unicode Standard Annex #14 and Unicode Standard Annex #29 ).

QTextBoundaryFinder can operate on a QString in four possible modes depending on the value of BoundaryType .

Units of Unicode characters that make up what the user thinks of as a character or basic unit of the language are here called Grapheme clusters. The two unicode characters ‘A’ + diaeresis do for example form one grapheme cluster as the user thinks of them as one character, yet it is in this case represented by two unicode code points (see http://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries ).

Word boundaries are there to locate the start and end of what a language considers to be a word (see http://www.unicode.org/reports/tr29/#Word_Boundaries ).

Line break boundaries give possible places where a line break might happen and sentence boundaries will show the beginning and end of whole sentences (see http://www.unicode.org/reports/tr29/#Sentence_Boundaries and http://www.unicode.org/reports/tr14/ ).

The first position in a string is always a valid boundary and refers to the position before the first character. The last position at the length of the string is also valid and refers to the position after the last character.

class QTextBoundaryFinder

QTextBoundaryFinder(type, string)

QTextBoundaryFinder(other)

param type

BoundaryType

param string

unicode

param other

QTextBoundaryFinder

Constructs an invalid QTextBoundaryFinder object.

Creates a QTextBoundaryFinder object of type operating on string .

Copies the QTextBoundaryFinder object, other .

PySide2.QtCore.QTextBoundaryFinder.BoundaryType

Constant

Description

QTextBoundaryFinder.Grapheme

Finds a grapheme which is the smallest boundary. It including letters, punctuation marks, numerals and more.

QTextBoundaryFinder.Word

Finds a word.

QTextBoundaryFinder.Line

Finds possible positions for breaking the text into multiple lines.

QTextBoundaryFinder.Sentence

Finds sentence boundaries. These include periods, question marks etc.

PySide2.QtCore.QTextBoundaryFinder.BoundaryReason

Constant

Description

QTextBoundaryFinder.NotAtBoundary

The boundary finder is not at a boundary position.

QTextBoundaryFinder.BreakOpportunity

The boundary finder is at a break opportunity position. Such a break opportunity might also be an item boundary (either , , or combination of both), a mandatory line break, or a soft hyphen.

QTextBoundaryFinder.StartOfItem

Since 5.0. The boundary finder is at the start of a grapheme, a word, a sentence, or a line.

QTextBoundaryFinder.EndOfItem

Since 5.0. The boundary finder is at the end of a grapheme, a word, a sentence, or a line.

QTextBoundaryFinder.MandatoryBreak

Since 5.0. The boundary finder is at the end of line (can occur for a Line boundary type only).

QTextBoundaryFinder.SoftHyphen

The boundary finder is at the soft hyphen (can occur for a Line boundary type only).

PySide2.QtCore.QTextBoundaryFinder.boundaryReasons()
Return type

BoundaryReasons

Returns the reasons for the boundary finder to have chosen the current position as a boundary.

PySide2.QtCore.QTextBoundaryFinder.isAtBoundary()
Return type

bool

Returns true if the object’s position() is currently at a valid text boundary.

PySide2.QtCore.QTextBoundaryFinder.isValid()
Return type

bool

Returns true if the text boundary finder is valid; otherwise returns false . A default QTextBoundaryFinder is invalid.

PySide2.QtCore.QTextBoundaryFinder.position()
Return type

int

Returns the current position of the QTextBoundaryFinder .

The range is from 0 (the beginning of the string) to the length of the string inclusive.

See also

setPosition()

PySide2.QtCore.QTextBoundaryFinder.setPosition(position)
Parameters

positionint

Sets the current position of the QTextBoundaryFinder to position .

If position is out of bounds, it will be bound to only valid positions. In this case, valid positions are from 0 to the length of the string inclusive.

See also

position()

PySide2.QtCore.QTextBoundaryFinder.string()
Return type

unicode

Returns the string the QTextBoundaryFinder object operates on.

PySide2.QtCore.QTextBoundaryFinder.toEnd()

Moves the finder to the end of the string. This is equivalent to setPosition (string. length() ).

PySide2.QtCore.QTextBoundaryFinder.toNextBoundary()
Return type

int

Moves the QTextBoundaryFinder to the next boundary position and returns that position.

Returns -1 if there is no next boundary.

PySide2.QtCore.QTextBoundaryFinder.toPreviousBoundary()
Return type

int

Moves the QTextBoundaryFinder to the previous boundary position and returns that position.

Returns -1 if there is no previous boundary.

PySide2.QtCore.QTextBoundaryFinder.toStart()

Moves the finder to the start of the string. This is equivalent to setPosition (0).

PySide2.QtCore.QTextBoundaryFinder.type()
Return type

BoundaryType

Returns the type of the QTextBoundaryFinder .