Examples of javax.swing.text.Highlighter

javax.swing.text.Highlighter
An interface for an object that allows one to mark up the background with colored areas. @author Timothy Prinzing

    public void paint(final Graphics g, final Shape shape) {
        Rectangle rc = shape.getBounds();


        // TODO change layered highlight painting code
        JTextComponent tc = (JTextComponent)getContainer();
        Highlighter hl = tc.getHighlighter();
        if (hl instanceof LayeredHighlighter) {
            ((LayeredHighlighter)hl).paintLayeredHighlights(g,
                                                            getStartOffset(),
                                                            getEndOffset(),
                                                            shape, tc, this);

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            return linkPos != -1 ? doc.getCharacterElement(linkPos) : null;
        }


        private static void moveHighlight(final JEditorPane editor,
                                          final int start, final int end) {
            Highlighter highlighter = editor.getHighlighter();
            Object tag = highlightTags.get(highlighter);
            if (tag != null) {
                highlighter.removeHighlight(tag);
                highlightTags.remove(highlighter);
            }
            try {
                tag = highlighter.addHighlight(start, end,
                                               new LinkHighlightPainter());
                highlightTags.put(highlighter, tag);
                editor.getCaret().setDot(start);
            } catch (final BadLocationException e) {
            }

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            } catch (final BadLocationException e) {
            }
        }


        static void removeHighlight(final JEditorPane editor) {
            Highlighter highlighter = editor.getHighlighter();
            Object tag = highlightTags.get(highlighter);
            if (tag != null) {
                highlighter.removeHighlight(tag);
                highlightTags.remove(highlighter);
            }
        }

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        if (!isActive) {
            return;
        }
        readLock();
        try {
            Highlighter highlighter = component.getHighlighter();
            Caret caret = component.getCaret();
            if (component.isOpaque()) {
                paintBackground(g);
            }
            if (highlighter != null) {
                highlighter.paint(g);
            }
            Rectangle visibleRect = getVisibleEditorRect();
            if (visibleRect != null) {
                getRootView().setSize(visibleRect.width, visibleRect.height);
                getRootView().paint(g, visibleRect);

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    public void testGetComponent() {
        assertEquals(jta, ((BasicTextUI) jta.getUI()).getComponent());
    }


    public void testCreateHighlighter() {
        Highlighter highlighter = basicTextUI.createHighlighter();
        assertTrue(highlighter instanceof BasicTextUI.BasicHighlighter);
    }

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        new javax.swing.JTextPane().updateUI();            
    }


    public void testInstallUI() throws Exception {
        Caret caret = jta.getCaret();
        Highlighter highlighter = jta.getHighlighter();
        String prefix = ((BasicTextUI) tf.getUI()).getPropertyPrefix();
        (jta.getUI()).uninstallUI(jta);
        TextUI ui = jta.getUI();
        assertTrue(ui instanceof TextAreaUI);
        TextAreaUI.callOrder = "";

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        assertTrue(caret instanceof DefaultCaret);
        assertTrue(caret instanceof UIResource);
    }


    public void testBasicHighlighter() {
        Highlighter highlighter = new BasicTextUI.BasicHighlighter();
        assertTrue(highlighter instanceof DefaultHighlighter);
        assertTrue(highlighter instanceof UIResource);
    }

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  }


  private void updateHighlights() {
    removeHighlights();


    Highlighter h = textComponent.getHighlighter();
    List<Span> spellErrors = new ArrayList<>();
    List<Span> grammarErrors = new ArrayList<>();


    for (Span span : documentSpans) {
      if (span.start == span.end) {
        continue;
      }
      if (ITSIssueType.Misspelling.equals(span.rule.getLocQualityIssueType())) {
        spellErrors.add(span);
      } else {
        grammarErrors.add(span);
      }
    }


    for (Span span : grammarErrors) {
      try {
        if (span.start < span.end) { //to avoid the BadLocationException
          h.addHighlight(span.start, span.end, bluePainter);
        }
      } catch (BadLocationException ex) {
        ex.printStackTrace();
      }
    }
    for (Span span : spellErrors) {
      try {
        if (span.start < span.end) { //to avoid the BadLocationException
          h.addHighlight(span.start, span.end, redPainter);
        }
      } catch (BadLocationException ex) {
        ex.printStackTrace();
      }
    }

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                checkField.setText(e.check);
                enclPanel.setInfo(e.encl);
                selfPanel.setInfo(e.self);
                // show file text with highlights
                body.setText(e.file.getCharContent(true).toString());
                Highlighter highlighter = body.getHighlighter();
                highlighter.removeAllHighlights();
                addHighlight(highlighter, e.encl, enclColor);
                addHighlight(highlighter, e.self, selfColor);
                scroll(body, getMinPos(enclPanel.info, selfPanel.info));
            } catch (IOException ex) {
                body.setText("Cannot read " + e.file.getName() + ": " + e);

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                checkField.setText(e.check);
                enclPanel.setInfo(e.encl);
                selfPanel.setInfo(e.self);
                // show file text with highlights
                body.setText(e.file.getCharContent(true).toString());
                Highlighter highlighter = body.getHighlighter();
                highlighter.removeAllHighlights();
                addHighlight(highlighter, e.encl, enclColor);
                addHighlight(highlighter, e.self, selfColor);
                scroll(body, getMinPos(enclPanel.info, selfPanel.info));
            } catch (IOException ex) {
                body.setText("Cannot read " + e.file.getName() + ": " + e);

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