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Improve error messages for StyledText

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Now they give you a hint as to what went wrong. Also, in checked mode, they now
throw during construction instead of during building.

Fixes #418
This commit is contained in:
Adam Barth 2015-08-06 22:42:13 -07:00
parent 4a70cfed5f
commit 2f3af49b0a
1 changed files with 10 additions and 4 deletions
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14
packages/flutter/lib/widgets/basic.dart
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@ -463,16 +463,22 @@ class StyledText extends Component {
// elements ::= "string" | [<text-style> <elements>*]
// Where "string" is text to display and text-style is an instance of
// TextStyle. The text-style applies to all of the elements that follow.
StyledText({ this.elements, Key key }) : super(key: key);
StyledText({ this.elements, Key key }) : super(key: key) {
assert(_toInline(elements) != null);
}
final dynamic elements;
RenderInline _toInline(dynamic element) {
if (element is String)
return new RenderText(element);
if (element is Iterable && element.first is TextStyle)
return new RenderStyled(element.first, element.skip(1).map(_toInline).toList());
throw new ArgumentError("invalid elements");
if (element is Iterable) {
dynamic first = element.first;
if (first is! TextStyle)
throw new ArgumentError("First element of Iterable is a ${first.runtimeType} not a TextStyle");
return new RenderStyled(first, element.skip(1).map(_toInline).toList());
}
throw new ArgumentError("Element is ${element.runtimeType} not a String or an Iterable");
}
Widget build() {