Examples of org.eclipse.jface.text.ITextViewerExtension5

org.eclipse.jface.text.ITextViewerExtension5
Extension interface for {@link org.eclipse.jface.text.ITextViewer}. Defines a conceptual replacement of the original visible region concept. This interface replaces {@link org.eclipse.jface.text.ITextViewerExtension3}.
Introduces the explicit concept of model and widget coordinates. For example, a selection returned by the text viewer's control is a widget selection. A widget selection always maps to a certain range of the viewer's document. This range is considered the model selection.
All model ranges that have a corresponding widget ranges are considered "exposed model ranges". The viewer can be requested to expose a given model range. Thus, a visible region is a particular degeneration of exposed model ranges.
This interface allows implementers to follow a sophisticated presentation model in which the visible presentation is a complex projection of the viewer's input document. @since 3.0

   * @return the line number relative to the viewer's visible region
   * @throws BadLocationException if <code>line</code> is not valid in the viewer's document
   */
  private int getWidgetLineNumber(int line) throws BadLocationException {
    if (fSourceViewer instanceof ITextViewerExtension5) {
      ITextViewerExtension5 extension= (ITextViewerExtension5) fSourceViewer;
      return extension.modelLine2WidgetLine(line);
    }


    IRegion region= fSourceViewer.getVisibleRegion();
    int firstLine= fSourceViewer.getDocument().getLineOfOffset(region.getOffset());
    return line - firstLine;

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    ModuleDeclaration parsed = parser.parse(unit);
    ISourceViewer sourceViewer = getSourceViewer();
    StyledText styledText = sourceViewer.getTextWidget();
    int caret = 0;
    if (sourceViewer instanceof ITextViewerExtension5) {
      ITextViewerExtension5 extension = (ITextViewerExtension5) sourceViewer;
      caret = extension.widgetOffset2ModelOffset(styledText.getCaretOffset());
    } else {
      int offset = sourceViewer.getVisibleRegion().getOffset();
      caret = offset + styledText.getCaretOffset();
    }
    RutaReferenceVisitor visitor1 = new RutaReferenceVisitor(caret);

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    // http://dev.eclipse.org/bugs/show_bug.cgi?id=34195
    int targetOffset = (ICharacterPairMatcher.RIGHT == anchor) ? offset + 1 : offset + length;


    boolean visible = false;
    if (sourceViewer instanceof ITextViewerExtension5) {
      ITextViewerExtension5 extension = (ITextViewerExtension5) sourceViewer;
      visible = (extension.modelOffset2WidgetOffset(targetOffset) > -1);
    } else {
      IRegion visibleRegion = sourceViewer.getVisibleRegion();
      // http://dev.eclipse.org/bugs/show_bug.cgi?id=34195
      visible = (targetOffset >= visibleRegion.getOffset() && targetOffset <= visibleRegion
              .getOffset() + visibleRegion.getLength());

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   *
   * @since 2.1
   */
  protected final static boolean isVisible(ITextViewer viewer, int offset) {
    if (viewer instanceof ITextViewerExtension5) {
      ITextViewerExtension5 extension= (ITextViewerExtension5) viewer;
      return extension.modelOffset2WidgetOffset(offset) >= 0;
    }
    IRegion region= viewer.getVisibleRegion();
    int vOffset= region.getOffset();
    return (vOffset <= offset &&  offset <= vOffset + region.getLength());
  }

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   */
  private int getOffset(IDocument document, StyledText textWidget, Point point)
      throws BadLocationException {
    int widgetCaret= fViewer.getTextWidget().getCaretOffset();
    if (fViewer instanceof ITextViewerExtension5) {
      ITextViewerExtension5 ext= (ITextViewerExtension5) fViewer;
      try {
        return ext.widgetOffset2ModelOffset(textWidget.getOffsetAtLocation(point));
      } catch (IllegalArgumentException e) {
        int docLineIndex= ext.widgetLine2ModelLine(textWidget.getLineIndex(point.y));
        String lineDelimiter= document.getLineDelimiter(docLineIndex);
        int delimLength= lineDelimiter == null ? 0 : lineDelimiter.length();
        return document.getLineOffset(docLineIndex) + document.getLineLength(docLineIndex)
            - delimLength;
      }

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        Point p= styledText.getLocationAtOffset(widgetOffset);
        if (p.x > x)
          widgetOffset--;


        if (textViewer instanceof ITextViewerExtension5) {
          ITextViewerExtension5 extension= (ITextViewerExtension5) textViewer;
          return extension.widgetOffset2ModelOffset(widgetOffset);
        }
        IRegion visibleRegion= textViewer.getVisibleRegion();
        return widgetOffset + visibleRegion.getOffset();
      } catch (IllegalArgumentException e) {
        return -1;

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    /*
     * @see IAction#run()
     */
    public void run() {
      if (fSourceViewer instanceof ITextViewerExtension5) {
        ITextViewerExtension5 extension= (ITextViewerExtension5) fSourceViewer;
        StyledText textWidget= fSourceViewer.getTextWidget();
        int topIndex= textWidget.getTopIndex();
        int newTopIndex= Math.max(0, topIndex + fScrollIncrement);
        fSourceViewer.setTopIndex(extension.widgetLine2ModelLine(newTopIndex));
      } else {
        int topIndex= fSourceViewer.getTopIndex();
        int newTopIndex= Math.max(0, topIndex + fScrollIncrement);
        fSourceViewer.setTopIndex(newTopIndex);
      }

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   * @since 3.0
   */
  private ILineRange adaptLineRangeToFolding(ILineRange lineRange, int line) {


    if (fSourceViewer instanceof ITextViewerExtension5) {
      ITextViewerExtension5 extension= (ITextViewerExtension5) fSourceViewer;


      try {
        IRegion region= convertToRegion(lineRange);
        IRegion[] coverage= extension.getCoveredModelRanges(region);
        if (coverage != null && coverage.length > 0) {
          IRegion container= findRegionContainingLine(coverage, line);
          if (container != null)
            return convertToLineRange(container);
        }

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   * @return the line number relative to the viewer's visible region
   * @throws BadLocationException if <code>line</code> is not valid in the viewer's document
   */
  private int getWidgetLineNumber(int line) throws BadLocationException {
    if (fSourceViewer instanceof ITextViewerExtension5) {
      ITextViewerExtension5 extension= (ITextViewerExtension5) fSourceViewer;
      return extension.modelLine2WidgetLine(line);
    }


    IRegion region= fSourceViewer.getVisibleRegion();
    int firstLine= fSourceViewer.getDocument().getLineOfOffset(region.getOffset());
    return line - firstLine;

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      String text= e.getText();
      int length= text == null ? 0 : text.length();


      if (fViewer instanceof ITextViewerExtension5) {
        ITextViewerExtension5 extension= (ITextViewerExtension5) fViewer;
        return extension.widgetRange2ModelRange(new Region(e.getOffset(), length));
      }


      IRegion visible= fViewer.getVisibleRegion();
      IRegion region= new Region(e.getOffset() + visible.getOffset(), length);
      return region;

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