63 lines
1.5 KiB
Dart
63 lines
1.5 KiB
Dart
part of skysprites;
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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 teh [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, [this._textStyle]) {
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if (_textStyle == null) {
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_textStyle = new TextStyle();
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}
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}
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String _text;
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/// The text being drawn by the label.
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String get text => _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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TextStyle _textStyle;
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/// The style to draw the text in.
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TextStyle get 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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TextPainter _painter;
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double _width;
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void paint(PaintingCanvas canvas) {
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if (_painter == null) {
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PlainTextSpan textSpan = new PlainTextSpan(_text);
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StyledTextSpan styledTextSpan = new StyledTextSpan(_textStyle, [textSpan]);
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_painter = new TextPainter(styledTextSpan);
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_painter.maxWidth = double.INFINITY;
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_painter.minWidth = 0.0;
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_painter.layout();
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_width = _painter.maxContentWidth.ceil().toDouble();
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_painter.maxWidth = _width;
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_painter.minWidth = _width;
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_painter.layout();
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}
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Offset offset = Offset.zero;
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if (_textStyle.textAlign == TextAlign.center) {
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offset = new Offset(-_width / 2.0, 0.0);
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} else if (_textStyle.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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