// Copyright 2017 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. import 'dart:io' as io; import 'dart:ui' as ui; import 'package:flutter/painting.dart'; import 'package:flutter_test/flutter_test.dart'; void main() { test('TextPainter caret test', () { final TextPainter painter = new TextPainter(); String text = 'A'; painter.text = new TextSpan(text: text); painter.layout(); Offset caretOffset = painter.getOffsetForCaret(const ui.TextPosition(offset: 0), ui.Rect.zero); expect(caretOffset.dx, 0); caretOffset = painter.getOffsetForCaret(new ui.TextPosition(offset: text.length), ui.Rect.zero); expect(caretOffset.dx, painter.width); // Check that getOffsetForCaret handles a character that is encoded as a surrogate pair. text = 'A\u{1F600}'; painter.text = new TextSpan(text: text); painter.layout(); caretOffset = painter.getOffsetForCaret(new ui.TextPosition(offset: text.length), ui.Rect.zero); expect(caretOffset.dx, painter.width); }, skip: io.Platform.isMacOS); // TODO(goderbauer): Disabled because of https://github.com/flutter/flutter/issues/4273 test('TextPainter error test', () { final TextPainter painter = new TextPainter(); expect(() { painter.paint(null, Offset.zero); }, throwsFlutterError); }); test('TextPainter size test', () { final TextPainter painter = new TextPainter( text: const TextSpan( text: 'X', style: const TextStyle( inherit: false, fontFamily: 'Ahem', fontSize: 123.0, ), ), ); painter.layout(); expect(painter.size, const Size(123.0, 123.0)); }); test('TextPainter default text height is 14 pixels', () { final TextPainter painter = new TextPainter(text: const TextSpan(text: 'x')); painter.layout(); expect(painter.preferredLineHeight, 14.0); expect(painter.size, const Size(14.0, 14.0)); }); test('TextPainter sets paragraph size from root', () { final TextPainter painter = new TextPainter(text: const TextSpan(text: 'x', style: const TextStyle(fontSize: 100.0))); painter.layout(); expect(painter.preferredLineHeight, 100.0); expect(painter.size, const Size(100.0, 100.0)); }); }