57 lines
1.5 KiB
Dart
57 lines
1.5 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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part of flutter_sprites;
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/// Labels are used to display a string of text in a the node tree. To align
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/// the label, the textAlign property of the [TextStyle] can be set.
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class Label extends Node {
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/// Creates a new Label with the provided [text] and [textStyle].
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Label(this._text, {
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TextStyle textStyle,
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TextAlign textAlign
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}) : _textStyle = textStyle ?? const TextStyle(),
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textAlign = textAlign ?? TextAlign.left;
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/// The text being drawn by the label.
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String get text => _text;
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String _text;
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set text(String text) {
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_text = text;
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_painter = null;
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}
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/// The style to draw the text in.
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TextStyle get textStyle => _textStyle;
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TextStyle _textStyle;
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set textStyle(TextStyle textStyle) {
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_textStyle = textStyle;
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_painter = null;
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}
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/// How the text should be aligned horizontally.
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TextAlign textAlign;
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TextPainter _painter;
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double _width;
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@override
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void paint(Canvas canvas) {
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if (_painter == null) {
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_painter = new TextPainter(text: new TextSpan(style: _textStyle, text: _text))
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..layout();
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_width = _painter.size.width;
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}
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Offset offset = Offset.zero;
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if (textAlign == TextAlign.center) {
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offset = new Offset(-_width / 2.0, 0.0);
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} else if (textAlign == TextAlign.right) {
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offset = new Offset(-_width, 0.0);
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}
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_painter.paint(canvas, offset);
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}
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}
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