TextDirection class

Bidi stands for Bi-directional text. According to http://en.wikipedia.org/wiki/Bi-directional_text: Bi-directional text is text containing text in both text directionalities, both right-to-left (RTL) and left-to-right (LTR). It generally involves text containing different types of alphabets, but may also refer to boustrophedon, which is changing text directionality in each row.

This file provides some utility classes for determining directionality of text, switching CSS layout from LTR to RTL, and other normalizing utilities needed when switching between RTL and LTR formatting.

It defines the TextDirection class which is used to represent directionality of text, In most cases, it is preferable to use bidi_formatter.dart, which provides bidi functionality in the given directional context, instead of using bidi_utils.dart directly.


hashCode int
The hash code for this object. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
spanText String
Textual representation of the directionality when used in span tag.
value String
Textual representation of the directionality constant. One of 'LTR', 'RTL', or 'UNKNOWN'.


isDirectionChange(TextDirection otherDirection) bool
Returns true if otherDirection is known to be different from this direction.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toString() String
Returns a string representation of this object.


operator ==(Object other) bool
The equality operator. [...]


LTR → const TextDirection
const TextDirection._('LTR', 'ltr')
RTL → const TextDirection
const TextDirection._('RTL', 'rtl')
UNKNOWN → const TextDirection
const TextDirection._('UNKNOWN', 'ltr')