TextPane接收到较长英文不换行bug的处理

最新推荐文章于 2023-11-28 09:59:25 发布

原创最新推荐文章于 2023-11-28 09:59:25 发布 · 525 阅读

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本文探讨了Java Swing组件TextPane在显示较长英文字符串时不自动换行的bug，并提供了相应的解决方案，帮助开发者优化用户体验。

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import javax.swing.JTextPane;
import javax.swing.text.AbstractDocument;
import javax.swing.text.BoxView;
import javax.swing.text.ComponentView;
import javax.swing.text.Element;
import javax.swing.text.IconView;
import javax.swing.text.LabelView;
import javax.swing.text.ParagraphView;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledEditorKit;
import javax.swing.text.View;
import javax.swing.text.ViewFactory;

/**
 * 针对Bug  JTextPane中当输入较长的英文无空格时，会认为这是一个单词，并且自动换行失效，导致JTextPane的实际宽度变大出现滚动条
 * 重写JTextPane的方法，来控制这个Bug
 */
public class MyTextPane extends JTextPane {

	private static final long serialVersionUID = 1L;

	public MyTextPane() {
		super();
		this.setEditorKit(new WarpEditorKit());
	}
	
	//内部类---以下内部类全都用于实现自动强制折行
	@SuppressWarnings("serial")
	private class WarpEditorKit extends StyledEditorKit {
 
		private ViewFactory defaultFactory = new WarpColumnFactory();
 
		@Override
		public ViewFactory getViewFactory() {
			return defaultFactory;
		}
	}
	
	//内部类
	private class WarpColumnFactory implements ViewFactory {
		public View create(Element elem) {
			String kind = elem.getName();
			if (kind != null) {
				if (kind.equals(AbstractDocument.ContentElementName)) {
					return new WarpLabelView(elem);
				} else if (kind.equals(AbstractDocument.ParagraphElementName)) {
					return new ParagraphView(elem);
				} else if (kind.equals(AbstractDocument.SectionElementName)) {
					return new BoxView(elem, View.Y_AXIS);
				} else if (kind.equals(StyleConstants.ComponentElementName)) {
					return new ComponentView(elem);
				} else if (kind.equals(StyleConstants.IconElementName)) {
					return new IconView(elem);
				}
			}
			return new LabelView(elem);
		}
	}
 
	private class WarpLabelView extends LabelView {
		public WarpLabelView(Element elem) {
			super(elem);
		}
		@Override
		public float getMinimumSpan(int axis) {
			switch (axis) {
				case View.X_AXIS:
					return 0;
				case View.Y_AXIS:
					return super.getMinimumSpan(axis);
				default:
					throw new IllegalArgumentException("Invalid axis: " + axis);
			}
		}
	}
}