RichText class

A paragraph of rich text.

The RichText widget displays text that uses multiple different styles. The text to display is described using a tree of TextSpan objects, each of which has an associated style that is used for that subtree. The text might break across multiple lines or might all be displayed on the same line depending on the layout constraints.

Text displayed in a RichText widget must be explicitly styled. When picking which style to use, consider using DefaultTextStyle.of the current BuildContext to provide defaults. For more details on how to style text in a RichText widget, see the documentation for TextStyle.

Consider using the Text widget to integrate with the DefaultTextStyle automatically. When all the text uses the same style, the default constructor is less verbose. The constructor allows you to style multiple spans with the default text style while still allowing specified styles per span.

This sample demonstrates how to mix and match text with different text styles using the RichText Widget. It displays the text "Hello bold world," emphasizing the word "bold" using a bold font weight.

  text: TextSpan(
    text: 'Hello ',
    style: DefaultTextStyle.of(context).style,
    children: <TextSpan>[
      TextSpan(text: 'bold', style: TextStyle(fontWeight: FontWeight.bold)),
      TextSpan(text: ' world!'),

See also:



RichText({Key key, @required InlineSpan text, TextAlign textAlign: TextAlign.start, TextDirection textDirection, bool softWrap: true, TextOverflow overflow: TextOverflow.clip, double textScaleFactor: 1.0, int maxLines, Locale locale, StrutStyle strutStyle, TextWidthBasis textWidthBasis: TextWidthBasis.parent, TextHeightBehavior textHeightBehavior})
Creates a paragraph of rich text. [...]


children List<Widget>
The widgets below this widget in the tree. [...]
final, inherited
hashCode int
The hash code for this object. [...]
@nonVirtual, read-only, inherited
key Key
Controls how one widget replaces another widget in the tree. [...]
final, inherited
locale Locale
Used to select a font when the same Unicode character can be rendered differently, depending on the locale. [...]
maxLines int
An optional maximum number of lines for the text to span, wrapping if necessary. If the text exceeds the given number of lines, it will be truncated according to overflow. [...]
overflow TextOverflow
How visual overflow should be handled.
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
softWrap bool
Whether the text should break at soft line breaks. [...]
strutStyle StrutStyle
The strut style to use. Strut style defines the strut, which sets minimum vertical layout metrics. [...]
text InlineSpan
The text to display in this widget.
textAlign TextAlign
How the text should be aligned horizontally.
textDirection TextDirection
The directionality of the text. [...]
textHeightBehavior TextHeightBehavior
Defines how the paragraph will apply TextStyle.height to the ascent of the first line and descent of the last line. [...]
textScaleFactor double
The number of font pixels for each logical pixel. [...]
textWidthBasis TextWidthBasis
Defines how to measure the width of the rendered text.


createElement() MultiChildRenderObjectElement
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
createRenderObject(BuildContext context) RenderParagraph
Creates an instance of the RenderObject class that this RenderObjectWidget represents, using the configuration described by this RenderObjectWidget. [...]
debugDescribeChildren() List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
didUnmountRenderObject(covariant RenderObject renderObject) → void
A render object previously associated with this widget has been removed from the tree. The given RenderObject will be of the same type as returned by this object's createRenderObject.
@protected, inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toDiagnosticsNode({String name, DiagnosticsTreeStyle style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep. [...]
toString({DiagnosticLevel minLevel:}) String
Returns a string representation of this object.
toStringDeep({String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants. [...]
toStringShallow({String joiner: ', ', DiagnosticLevel minLevel: DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object. [...]
toStringShort() String
A short, textual description of this widget.
updateRenderObject(BuildContext context, covariant RenderParagraph renderObject) → void
Copies the configuration described by this RenderObjectWidget to the given RenderObject, which will be of the same type as returned by this object's createRenderObject. [...]


operator ==(Object other) bool
The equality operator. [...]
@nonVirtual, inherited