Text class - widgets library (original) (raw)

A run of text with a single style.

The Text widget displays a string of text with single style. The string might break across multiple lines or might all be displayed on the same line depending on the layout constraints.

The style argument is optional. When omitted, the text will use the style from the closest enclosing DefaultTextStyle. If the given style'sTextStyle.inherit property is true (the default), the given style will be merged with the closest enclosing DefaultTextStyle. This merging behavior is useful, for example, to make the text bold while using the default font family and size.

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Container(
  width: 100,
  decoration: BoxDecoration(border: Border.all()),
  child: Text(overflow: TextOverflow.ellipsis, 'Hello $_name, how are you?'))

Setting maxLines to 1 is not equivalent to disabling soft wrapping withsoftWrap. This is apparent when using TextOverflow.fade as the following examples show.

If a second line overflows the Text widget displays a horizontal fade

Here soft wrapping is enabled and the Text widget tries to wrap the words "how are you?" to a second line. This is prevented by the maxLines value of 1. The result is that a second line overflows and the fade appears in a horizontal direction at the bottom.

If a single line overflows the Text widget displays a horizontal fade

Here soft wrapping is disabled with softWrap: false and the Text widget attempts to display its text in a single unbroken line. The result is that the single line overflows and the fade appears in a vertical direction at the right.

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Text(
  overflow: TextOverflow.fade,
  maxLines: 1,
  'Hello $_name, how are you?')

// ...

Text(
  overflow: TextOverflow.fade,
  softWrap: false,
  'Hello $_name, how are you?')

Using the Text.rich constructor, the Text widget can display a paragraph with differently styled TextSpans. The sample that follows displays "Hello beautiful world" with different styles for each word.

The word "Hello" is shown with the default text styles. The word "beautiful" is italicized. The word "world" is bold.

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const Text.rich(
  TextSpan(
    text: 'Hello', // default text style
    children: <TextSpan>[
      TextSpan(text: ' beautiful ', style: TextStyle(fontStyle: FontStyle.italic)),
      TextSpan(text: 'world', style: TextStyle(fontWeight: FontWeight.bold)),
    ],
  ),
)

Interactivity

To make Text react to touch events, wrap it in a GestureDetector widget with a GestureDetector.onTap handler.

In a Material Design application, consider using a TextButton instead, or if that isn't appropriate, at least using an InkWell instead ofGestureDetector.

To make sections of the text interactive, use RichText and specify aTapGestureRecognizer as the TextSpan.recognizer of the relevant part of the text.

Selection

Text is not selectable by default. To make a Text selectable, one can wrap a subtree with a SelectionArea widget. To exclude a part of a subtree under SelectionArea from selection, once can also wrap that part of the subtree with SelectionContainer.disabled.

This sample demonstrates how to disable selection for a Text under a SelectionArea.

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To create a local project with this code sample, run:
flutter create --sample=widgets.Text.4 mysample

Constructors

Text(String data, {Key? key, TextStyle? style, StrutStyle? strutStyle, TextAlign? textAlign, TextDirection? textDirection, Locale? locale, bool? softWrap, TextOverflow? overflow, @Deprecated('Use textScaler instead. ' 'Use of textScaleFactor was deprecated in preparation for the upcoming nonlinear text scaling support. ' 'This feature was deprecated after v3.12.0-2.0.pre.') double? textScaleFactor, TextScaler? textScaler, int? maxLines, String? semanticsLabel, String? semanticsIdentifier, TextWidthBasis? textWidthBasis, TextHeightBehavior? textHeightBehavior, Color? selectionColor})

Creates a text widget.

const

Text.rich(InlineSpan textSpan, {Key? key, TextStyle? style, StrutStyle? strutStyle, TextAlign? textAlign, TextDirection? textDirection, Locale? locale, bool? softWrap, TextOverflow? overflow, @Deprecated('Use textScaler instead. ' 'Use of textScaleFactor was deprecated in preparation for the upcoming nonlinear text scaling support. ' 'This feature was deprecated after v3.12.0-2.0.pre.') double? textScaleFactor, TextScaler? textScaler, int? maxLines, String? semanticsLabel, String? semanticsIdentifier, TextWidthBasis? textWidthBasis, TextHeightBehavior? textHeightBehavior, Color? selectionColor})

Creates a text widget with a InlineSpan.

const

Properties

data → String?

The text to display.

final

hashCode → int

The hash code for this object.

no setterinherited

key → Key?

Controls how one widget replaces another widget in the tree.

finalinherited

locale → Locale?

Used to select a font when the same Unicode character can be rendered differently, depending on the locale.

final

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.

final

overflow → TextOverflow?

How visual overflow should be handled.

final

runtimeType → Type

A representation of the runtime type of the object.

no setterinherited

selectionColor → Color?

The color to use when painting the selection.

final

semanticsIdentifier → String?

A unique identifier for the semantics node for this widget.