75 lines
2.5 KiB
Dart
75 lines
2.5 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/widgets.dart';
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import 'package:flutter_test/flutter_test.dart';
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void main() {
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test('WidgetSpan codeUnitAt', () {
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const InlineSpan span = WidgetSpan(child: SizedBox());
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expect(span.codeUnitAt(-1), isNull);
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expect(span.codeUnitAt(0), PlaceholderSpan.placeholderCodeUnit);
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expect(span.codeUnitAt(1), isNull);
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expect(span.codeUnitAt(2), isNull);
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const InlineSpan nestedSpan = TextSpan(text: 'AAA', children: <InlineSpan>[span, span]);
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expect(nestedSpan.codeUnitAt(-1), isNull);
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expect(nestedSpan.codeUnitAt(0), 65);
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expect(nestedSpan.codeUnitAt(1), 65);
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expect(nestedSpan.codeUnitAt(2), 65);
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expect(nestedSpan.codeUnitAt(3), PlaceholderSpan.placeholderCodeUnit);
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expect(nestedSpan.codeUnitAt(4), PlaceholderSpan.placeholderCodeUnit);
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expect(nestedSpan.codeUnitAt(5), isNull);
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});
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test('WidgetSpan.extractFromInlineSpan applies the correct scaling factor', () {
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const a = WidgetSpan(child: SizedBox(), style: TextStyle(fontSize: 0));
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const b = WidgetSpan(child: SizedBox(), style: TextStyle(fontSize: 10));
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const c = WidgetSpan(child: SizedBox());
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const d = WidgetSpan(child: SizedBox(), style: TextStyle(letterSpacing: 999));
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const span = TextSpan(
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children: <InlineSpan>[
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a, // fontSize = 0.
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TextSpan(
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children: <InlineSpan>[
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b, // fontSize = 10.
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c, // fontSize = 20.
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],
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style: TextStyle(fontSize: 20),
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),
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d, // fontSize = 14.
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],
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);
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double effectiveTextScaleFactorFromWidget(Widget widget) {
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final child = (widget as ProxyWidget).child as Semantics;
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final dynamic grandChild = child.child;
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final textScaleFactor = grandChild.textScaleFactor as double; // ignore: avoid_dynamic_calls
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return textScaleFactor;
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}
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final List<double> textScaleFactors = WidgetSpan.extractFromInlineSpan(
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span,
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const _QuadraticScaler(),
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).map(effectiveTextScaleFactorFromWidget).toList();
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expect(textScaleFactors, <double>[
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0, // a
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10, // b
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20, // c
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14, // d
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]);
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});
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}
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class _QuadraticScaler extends TextScaler {
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const _QuadraticScaler();
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@override
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double scale(double fontSize) => fontSize * fontSize;
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@override
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double get textScaleFactor => throw UnimplementedError();
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}
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