从特定单词中删除突出显示 – Java

我想构建一个示例以从与我的应用的filter匹配的单词中删除高亮显示。 因此，我基于以下示例：

public void removeHighlights(JTextComponent jTextArea) { Highlighter hilite = jTextArea.getHighlighter(); Highlighter.Highlight[] hilites = hilite.getHighlights(); for (int i = 0; i < hilites.length; i++) { if (hilites[i].getPainter() instanceof TextHighLighter) { hilite.removeHighlight(hilites[i]); } } } 

此示例适用于删除文本区域的所有高亮显示。 例如，如果我有三个选中的单词而我取消选中一个框，则所有filter都将被删除，我只想删除未选中单词的高亮显示。是否有一种简单的方法来检查哪个单词与filter匹配？ 或者我需要手动完成吗？ 直到现在我才发现我的研究没什么成功的

提前致谢

最终编辑：

基于@camickr回答的逻辑为我工作：

 public void removeHighlights(JTextComponent jTextArea, String turnLightOff) { Highlighter hilite = jTextArea.getHighlighter(); Highlighter.Highlight[] hilites = hilite.getHighlights(); for (int i = 0; i < hilites.length; i++) { int wordLenght = hilites[i].getEndOffset() - hilites[i].getStartOffset(); if(wordLenght == turnLightOff.length()){ if (hilites[i].getPainter() instanceof TextHighLighter) { hilite.removeHighlight(hilites[i]); } } } } 

Answer 1

有没有一种简单的方法可以检查哪个单词与filter匹配？

没有。

或者我需要手动完成吗？

是。 每个突出显示都包含突出显示的开始/结束偏移。 因此，您可以使用这些值从Document获取文本。 如果文本匹配，则删除突出显示。

Answer 2

• 查看有关添加/删除Highlighter / instanceof myHighLighter的简单示例

。

 import java.awt.BorderLayout; import java.awt.Color; import java.awt.FontMetrics; import java.awt.Graphics; import java.awt.Rectangle; import java.awt.Shape; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextField; import javax.swing.JTextPane; import javax.swing.UIManager; import javax.swing.event.DocumentEvent; import javax.swing.event.DocumentListener; import javax.swing.text.BadLocationException; import javax.swing.text.DefaultHighlighter; import javax.swing.text.Document; import javax.swing.text.Highlighter; import javax.swing.text.JTextComponent; import javax.swing.text.LayeredHighlighter; import javax.swing.text.Position; import javax.swing.text.View; public class HighlightExample { public static void main(String[] args) { UIManager.put("TextPane.caretForeground", Color.yellow); UIManager.put("TextPane.selectionBackground", Color.green); UIManager.put("TextPane.selectionForeground", Color.blue); /*try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); } catch (Exception evt) { }*/ JFrame f = new JFrame("Highlight example"); final JTextPane textPane = new JTextPane(); textPane.setHighlighter(highlighter); textPane.setText("This text pane contains no html. It supports letter wrapping, " + "\nThis text pane contains no html. It supports letter wrapping!, " + "\nThis text pane contains no html. It supports letter wrapping!, " + "\nThis text pane contains no html. It supports letter wrapping!, " + "\nThis text pane contains no html. It supports letter wrapping!, " + "\nThis text pane contains no html. It supports letter wrapping!"); JPanel pane = new JPanel(); pane.setLayout(new BorderLayout()); pane.add(new JLabel("Enter word, then press ENTER key: "), "West"); final JTextField tf = new JTextField("wrapping!"); pane.add(tf, "Center"); f.add(pane, "South"); f.add(new JScrollPane(textPane), "Center"); /*try { textPane.read(new FileReader("links1.html"), null); } catch (Exception e) { System.out.println("Failed to load file " + args[0]); System.out.println(e); }*/ final WordSearcher searcher = new WordSearcher(textPane); tf.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent evt) { word = tf.getText().trim(); int offset = searcher.search(word); if (offset != -1) { try { textPane.scrollRectToVisible(textPane .modelToView(offset)); } catch (BadLocationException e) { } } } }); textPane.getDocument().addDocumentListener(new DocumentListener() { @Override public void insertUpdate(DocumentEvent evt) { searcher.search(word); } @Override public void removeUpdate(DocumentEvent evt) { searcher.search(word); } @Override public void changedUpdate(DocumentEvent evt) { } }); f.setSize(400, 400); f.setVisible(true); } public static String word; public static Highlighter highlighter = new UnderlineHighlighter(null); } // A simple class that searches for a word in // a document and highlights occurrences of that word class WordSearcher { public WordSearcher(JTextComponent comp) { this.comp = comp; this.painter = new UnderlineHighlighter.UnderlineHighlightPainter( Color.red); } // Search for a word and return the offset of the // first occurrence. Highlights are added for all // occurrences found. public int search(String word) { int firstOffset = -1; Highlighter highlighter = comp.getHighlighter(); // Remove any existing highlights for last word Highlighter.Highlight[] highlights = highlighter.getHighlights(); for (int i = 0; i < highlights.length; i++) { Highlighter.Highlight h = highlights[i]; if (h.getPainter() instanceof UnderlineHighlighter.UnderlineHighlightPainter) { highlighter.removeHighlight(h); } } if (word == null || word.equals("")) { return -1; } // Look for the word we are given - insensitive search String content = null; try { Document d = comp.getDocument(); content = d.getText(0, d.getLength()).toLowerCase(); } catch (BadLocationException e) { // Cannot happen return -1; } word = word.toLowerCase(); int lastIndex = 0; int wordSize = word.length(); while ((lastIndex = content.indexOf(word, lastIndex)) != -1) { int endIndex = lastIndex + wordSize; try { highlighter.addHighlight(lastIndex, endIndex, painter); } catch (BadLocationException e) { // Nothing to do } if (firstOffset == -1) { firstOffset = lastIndex; } lastIndex = endIndex; } return firstOffset; } protected JTextComponent comp; protected Highlighter.HighlightPainter painter; } class UnderlineHighlighter extends DefaultHighlighter { public UnderlineHighlighter(Color c) { painter = (c == null ? sharedPainter : new UnderlineHighlightPainter(c)); } // Convenience method to add a highlight with // the default painter. public Object addHighlight(int p0, int p1) throws BadLocationException { return addHighlight(p0, p1, painter); } @Override public void setDrawsLayeredHighlights(boolean newValue) { // Illegal if false - we only support layered highlights if (newValue == false) { throw new IllegalArgumentException( "UnderlineHighlighter only draws layered highlights"); } super.setDrawsLayeredHighlights(true); } // Painter for underlined highlights public static class UnderlineHighlightPainter extends LayeredHighlighter.LayerPainter { public UnderlineHighlightPainter(Color c) { color = c; } @Override public void paint(Graphics g, int offs0, int offs1, Shape bounds, JTextComponent c) { // Do nothing: this method will never be called } @Override public Shape paintLayer(Graphics g, int offs0, int offs1, Shape bounds, JTextComponent c, View view) { g.setColor(color == null ? c.getSelectionColor() : color); Rectangle alloc = null; if (offs0 == view.getStartOffset() && offs1 == view.getEndOffset()) { if (bounds instanceof Rectangle) { alloc = (Rectangle) bounds; } else { alloc = bounds.getBounds(); } } else { try { Shape shape = view.modelToView(offs0, Position.Bias.Forward, offs1, Position.Bias.Backward, bounds); alloc = (shape instanceof Rectangle) ? (Rectangle) shape : shape.getBounds(); } catch (BadLocationException e) { return null; } } FontMetrics fm = c.getFontMetrics(c.getFont()); int baseline = alloc.y + alloc.height - fm.getDescent() + 1; g.drawLine(alloc.x, baseline, alloc.x + alloc.width, baseline); g.drawLine(alloc.x, baseline + 1, alloc.x + alloc.width, baseline + 1); return alloc; } protected Color color; // The color for the underline } // Shared painter used for default highlighting protected static final Highlighter.HighlightPainter sharedPainter = new UnderlineHighlightPainter( null); // Painter used for this highlighter protected Highlighter.HighlightPainter painter; } 

Answer 3

如果您不想保留任何亮点，可以将它们全部删除。

 highlighter.removeAllHighlights();