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improve error messages on Text constructors (#28709)

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Dan Field 2019-03-01 10:20:08 -08:00 committed by GitHub
parent a3683d303e
commit be083da9c6
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1 changed files with 12 additions and 2 deletions
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14
packages/flutter/lib/src/widgets/text.dart
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@ -222,6 +222,8 @@ class Text extends StatelessWidget {
///
/// If the [style] argument is null, the text will use the style from the
/// closest enclosing [DefaultTextStyle].
///
/// The [data] parameter must not be null.
const Text(this.data, {
Key key,
this.style,
@ -234,11 +236,16 @@ class Text extends StatelessWidget {
this.textScaleFactor,
this.maxLines,
this.semanticsLabel,
}) : assert(data != null),
}) : assert(
data != null,
'A non-null String must be provided to a Text widget.',
),
textSpan = null,
super(key: key);
/// Creates a text widget with a [TextSpan].
///
/// The [textSpan] parameter must not be null.
const Text.rich(this.textSpan, {
Key key,
this.style,
@ -251,7 +258,10 @@ class Text extends StatelessWidget {
this.textScaleFactor,
this.maxLines,
this.semanticsLabel,
}) : assert(textSpan != null),
}) : assert(
textSpan != null,
'A non-null TextSpan must be provided to a Text.rich widget.',
),
data = null,
super(key: key);