Examples of org.eclipse.jface.text.ITextViewerExtension2

org.eclipse.jface.text.ITextViewerExtension2
Extension interface for {@link org.eclipse.jface.text.ITextViewer}.
It provides
- text presentation invalidation enhancements
- text hover management enhancements
- a replacement for auto indent strategies
- support for custom painters
It extends the means for text presentation invalidation by allowing a specific region of the presentation to get invalidated. It replaces {@link org.eclipse.jface.text.ITextViewer#setTextHover(ITextHover,String)}with a new method that allows to specify state masks for a better control of the hover behavior.
An {@link org.eclipse.jface.text.IAutoEditStrategy} is a generalization ofthe original {@link org.eclipse.jface.text.IAutoIndentStrategy}. Auto edit strategies can be arranged in a list that is executed like a pipeline when the viewer content is changed.
A {@link org.eclipse.jface.text.IPainter}is creating and managing visual decorations on the viewer's text widget. Viewer's can have an open number of painters. Painters are informed about changes to the viewer content and state and can take the necessary action in responds to the notification. @since 2.1

        if (!(sourceViewer instanceof ITextViewerExtension2)) {
            fTextOperationAction.run();
            return;
        }


        final ITextViewerExtension2 textViewerExtension2 = (ITextViewerExtension2) sourceViewer;


        // does a text hover exist?
        final ITextHover textHover = textViewerExtension2.getCurrentTextHover();
        if (textHover == null) {
            // TODO this crashes... why?
            // fTextOperationAction.run();
            return;
        }


        final Point hoverEventLocation = textViewerExtension2.getHoverEventLocation();
        final int offset = computeOffsetAtLocation(sourceViewer, hoverEventLocation.x,
                hoverEventLocation.y);
        if (offset == -1) {
            fTextOperationAction.run();
            return;

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  private void showMatchingCharacters() {
    if (fMatchingCharacterPainter == null) {
      if (fSourceViewer instanceof ITextViewerExtension2) {
        fMatchingCharacterPainter= new MatchingCharacterPainter(fSourceViewer, fCharacterPairMatcher);
        fMatchingCharacterPainter.setColor(getColor(fMatchingCharacterPainterColorKey));
        ITextViewerExtension2 extension= (ITextViewerExtension2) fSourceViewer;
        extension.addPainter(fMatchingCharacterPainter);
      }
    }
  }

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   * Disables showing of matching characters.
   */
  private void hideMatchingCharacters() {
    if (fMatchingCharacterPainter != null) {
      if (fSourceViewer instanceof ITextViewerExtension2) {
        ITextViewerExtension2 extension= (ITextViewerExtension2) fSourceViewer;
        extension.removePainter(fMatchingCharacterPainter);
        fMatchingCharacterPainter.deactivate(true);
        fMatchingCharacterPainter.dispose();
        fMatchingCharacterPainter= null;
      }
    }

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  private void showCursorLine() {
    if (fCursorLinePainter == null) {
      if (fSourceViewer instanceof ITextViewerExtension2) {
        fCursorLinePainter= new CursorLinePainter(fSourceViewer);
        fCursorLinePainter.setHighlightColor(getColor(fCursorLinePainterColorKey));
        ITextViewerExtension2 extension= (ITextViewerExtension2) fSourceViewer;
        extension.addPainter(fCursorLinePainter);
      }
    }
  }

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   * Hides the cursor line.
   */
  private void hideCursorLine() {
    if (fCursorLinePainter != null) {
      if (fSourceViewer instanceof ITextViewerExtension2) {
        ITextViewerExtension2 extension= (ITextViewerExtension2) fSourceViewer;
        extension.removePainter(fCursorLinePainter);
        fCursorLinePainter.deactivate(true);
        fCursorLinePainter.dispose();
        fCursorLinePainter= null;
      }
    }

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      if (fSourceViewer instanceof ITextViewerExtension2) {
        fMarginPainter= new MarginPainter(fSourceViewer);
        fMarginPainter.setMarginRulerColor(getColor(fMarginPainterColorKey));
        if (fPreferenceStore != null)
          fMarginPainter.setMarginRulerColumn(fPreferenceStore.getInt(fMarginPainterColumnKey));
        ITextViewerExtension2 extension= (ITextViewerExtension2) fSourceViewer;
        extension.addPainter(fMarginPainter);


        fFontPropertyChangeListener= new FontPropertyChangeListener();
        JFaceResources.getFontRegistry().addListener(fFontPropertyChangeListener);
      }
    }

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    if (fMarginPainter != null) {
      if (fSourceViewer instanceof ITextViewerExtension2) {
        JFaceResources.getFontRegistry().removeListener(fFontPropertyChangeListener);
        fFontPropertyChangeListener= null;


        ITextViewerExtension2 extension= (ITextViewerExtension2) fSourceViewer;
        extension.removePainter(fMarginPainter);
        fMarginPainter.deactivate(true);
        fMarginPainter.dispose();
        fMarginPainter= null;
      }
    }

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    if (fSourceViewer instanceof ITextViewerExtension2) {
      if (fAnnotationPainter == null) {
        fAnnotationPainter= createAnnotationPainter();
        if (fSourceViewer instanceof ITextViewerExtension4)
          ((ITextViewerExtension4)fSourceViewer).addTextPresentationListener(fAnnotationPainter);
        ITextViewerExtension2 extension= (ITextViewerExtension2) fSourceViewer;
        extension.addPainter(fAnnotationPainter);
      }
      fAnnotationPainter.setAnnotationTypeColor(annotationType, getAnnotationTypeColor(annotationType));
      if (highlighting)
        fAnnotationPainter.addHighlightAnnotationType(annotationType);
      else

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      return;


    fAnnotationPainter.paint(IPainter.CONFIGURATION);
    if (!fAnnotationPainter.isPaintingAnnotations()) {
      if (fSourceViewer instanceof ITextViewerExtension2) {
        ITextViewerExtension2 extension= (ITextViewerExtension2) fSourceViewer;
        extension.removePainter(fAnnotationPainter);
      }
      if (fSourceViewer instanceof ITextViewerExtension4)
        ((ITextViewerExtension4)fSourceViewer).removeTextPresentationListener(fAnnotationPainter);


      fAnnotationPainter.deactivate(true);

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    projectionViewer.doOperation(ProjectionViewer.TOGGLE);
    projectionViewer.getTextWidget().setTabs(
        getPreferenceStore().getInt(
            AbstractDecoratedTextEditorPreferenceConstants.EDITOR_TAB_WIDTH));
    
    ITextViewerExtension2 extension= (ITextViewerExtension2) getSourceViewer();
    pairMatcher = new HTMLCharacterPairMatcher();
    pairMatcher.setEnable(getPreferenceStore().getBoolean(HTMLPlugin.PREF_PAIR_CHAR));
    MatchingCharacterPainter painter = new MatchingCharacterPainter(getSourceViewer(), pairMatcher);
    painter.setColor(Display.getDefault().getSystemColor(SWT.COLOR_GRAY));
    extension.addPainter(painter);
    
    update();
  }

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