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Previously, the fn "Text" class rendered as a single block of text. Now, there's a "Paragraph" class that contains "TextFragment"s, and "Text" is just a component that places a single TextFragment into a single Paragraph. This allows other components, notably the Input component, to build more complicated paragraphs of styled text, without using 'display'. R=eseidel@chromium.org Review URL: https://codereview.chromium.org/1139123007
91 lines
2.2 KiB
Dart
91 lines
2.2 KiB
Dart
// Copyright 2015 The Chromium 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 '../fn.dart';
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import '../theme/colors.dart';
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import 'dart:async';
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import 'editable_string.dart';
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class EditableText extends Component {
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static final Style _cursorStyle = new Style('''
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width: 2px;
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height: 1.2em;
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vertical-align: top;
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background-color: ${Blue[500]};'''
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);
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static final Style _composingStyle = new Style('''
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text-decoration: underline;'''
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);
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EditableString value;
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bool focused;
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Timer _cursorTimer;
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bool _showCursor = false;
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EditableText({Object key, this.value, this.focused})
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: super(key: key, stateful: true) {
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onDidUnmount(() {
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if (_cursorTimer != null)
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_stopCursorTimer();
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});
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}
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void _cursorTick(Timer timer) {
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setState(() {
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_showCursor = !_showCursor;
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});
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}
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void _startCursorTimer() {
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_showCursor = true;
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_cursorTimer = new Timer.periodic(
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new Duration(milliseconds: 500), _cursorTick);
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}
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void _stopCursorTimer() {
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_cursorTimer.cancel();
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_cursorTimer = null;
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_showCursor = false;
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}
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UINode build() {
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if (focused && _cursorTimer == null)
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_startCursorTimer();
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else if (!focused && _cursorTimer != null)
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_stopCursorTimer();
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List<UINode> children = new List<UINode>();
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if (!value.composing.isValid) {
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children.add(new TextFragment(value.text));
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} else {
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String beforeComposing = value.textBefore(value.composing);
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if (!beforeComposing.isEmpty)
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children.add(new TextFragment(beforeComposing));
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String composing = value.textInside(value.composing);
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if (!composing.isEmpty) {
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children.add(new TextFragment(
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composing,
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key: 'composing',
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style: _composingStyle
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));
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}
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String afterComposing = value.textAfter(value.composing);
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if (!afterComposing.isEmpty)
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children.add(new TextFragment(afterComposing));
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}
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if (_showCursor)
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children.add(new Container(key: 'cursor', style: _cursorStyle));
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return new Paragraph(
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children: children
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);
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}
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}
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