How to use

TextViewer

in

org.eclipse.jface.text

@Override
public Control createControl(Composite parent) {
  fTextViewer = new TextViewer(parent, SWT.READ_ONLY);
  fTextViewer.setDocument(new Document());
  StyledText styleText = fTextViewer.getTextWidget();
  styleText.setText("\r\n\r\n" + DebugUIMessages.EmptyViewTab_Unable_to_create + "\n" + getRenderingName() + "\n\n" + DebugUIMessages.ErrorRendering_0 + fException.getMessage()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
  return fTextViewer.getControl();
}

  /**
   * Selects all in the viewer.
   */
  @Override
  public void run() {
    fTextViewer.doOperation(ITextOperationTarget.SELECT_ALL);
  }
}

/**
 * Returns whether the marked region of this viewer is empty.
 *
 * @return <code>true</code> if the marked region of this viewer is empty, otherwise <code>false</code>
 * @since 2.0
 */
private boolean isMarkedRegionEmpty() {
  return
    fTextWidget == null ||
    fMarkPosition == null ||
    fMarkPosition.isDeleted() ||
    modelRange2WidgetRange(fMarkPosition) == null;
}

@Override
public void refresh() {
  setDocument(getDocument());
}

  @Override
  public void widgetDisposed(DisposeEvent e) {
    fDisposedControl= getControl();
    handleDispose();
  }
}

@Override
public void setTopIndex(int index) {
  if (fTextWidget != null) {
    int widgetLine= modelLine2WidgetLine(index);
    if (widgetLine == -1)
      widgetLine= getClosestWidgetLineForModelLine(index);
    if (widgetLine > -1) {
      fTextWidget.setTopIndex(widgetLine);
        updateViewportListeners(INTERNAL);
    }
  }
}

fTextViewer= new TextViewer(parent, SWT.MULTI | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
fTextViewer.setDocument(new Document());
GridData gridData = new GridData(GridData.FILL_BOTH);
gridData.widthHint= 300;
gridData.heightHint= 150;
fTextViewer.getTextWidget().setLayoutData(gridData);
try {
  String valueString = fVariable.getValue().getValueString();
  fTextViewer.getDocument().set(valueString);
  fTextViewer.setSelectedRange(0, valueString.length());
} catch (DebugException e) {
  JDIDebugUIPlugin.log(e);
fTextViewer.getControl().setFocus();
fWrapText= new Button(parent, SWT.CHECK);
fWrapText.setText(ActionMessages.StringValueInputDialog_4); 

@Override
public void setSelection(ISelection selection, boolean reveal) {
  if (selection instanceof IBlockTextSelection && getTextWidget().getBlockSelection()) {
    IBlockTextSelection s= (IBlockTextSelection) selection;
      int startOffset= modelRange2ClosestWidgetRange(startRegion).getOffset();
      IRegion endRegion= new Region(endLineInfo.getOffset() + s.getEndColumn() - endVirtuals, 0);
      int endOffset= modelRange2ClosestWidgetRange(endRegion).getOffset();
      Point clientAreaOrigin= new Point(fTextWidget.getHorizontalPixel(), fTextWidget.getTopPixel());
      Point startLocation= Geometry.add(clientAreaOrigin, fTextWidget.getLocationAtOffset(startOffset));
      int averageCharWidth= getAverageCharWidth();
      startLocation.x += startVirtuals * averageCharWidth;
      Point endLocation= Geometry.add(clientAreaOrigin, fTextWidget.getLocationAtOffset(endOffset));
      validateSelectionRange(widgetSelection);
      if (widgetSelection[0] >= 0) {
        fTextWidget.setBlockSelectionBounds(Geometry.createRectangle(startLocation, Geometry.subtract(endLocation, startLocation)));
        selectionChanged(startOffset, widgetLength);
      setSelectedRange(s.getOffset(), s.getLength());
      revealRange(s.getOffset(), s.getLength());
  } else if (selection instanceof ITextSelection) {
    ITextSelection s= (ITextSelection) selection;
    setSelectedRange(s.getOffset(), s.getLength());
    if (reveal)
      revealRange(s.getOffset(), s.getLength());

private void doFocusChanged(Widget control) {
  for (int i= 0; i < fViewers.length; i++) {
    if (fViewers[i].getTextWidget() == control) {
      propagateFocusChanged(fViewers[i]);
      return;
    }
  }
}

fUpdaterDocument.addPositionUpdater(fUpdater);
ISelection selection= TextViewer.this.getSelection();
if (selection instanceof IBlockTextSelection) {
  IBlockTextSelection bts= (IBlockTextSelection) selection;
  int caretOffset= fTextWidget.getCaretOffset();
  fReverseSelection= caretOffset == range.x;
  Point selectionRange= getSelectedRange();
  fSelection= new Position(selectionRange.x, selectionRange.y);
int stableWidgetLine= modelLine2WidgetLine(stableLine);
fStablePixel= getTextWidget().getLinePixel(stableWidgetLine);
IRegion stableLineInfo= fUpdaterDocument.getLineInformation(stableLine);
fStableLine= new Position(stableLineInfo.getOffset(), stableLineInfo.getLength());

/**
 * Create the error page of this rendering
 *
 * @param parent the parent to add the page to
 */
private void createMessagePage(Composite parent) {
  if (fTextViewer == null) {
    fTextViewer = new TextViewer(parent, SWT.WRAP);
    fTextViewer.setDocument(new Document());
    StyledText styleText = fTextViewer.getTextWidget();
    styleText.setEditable(false);
    styleText.setEnabled(false);
  }
}

/**
 * Displays an error message for the given exception.
 *
 * @param e exception to display
 */
public void displayError(DebugException e)
{
  StyledText styleText = null;
  fIsShowingErrorPage = true;
  styleText = fTextViewer.getTextWidget();
  if (styleText != null) {
    styleText.setText(DebugUIMessages.AbstractTableRendering_3 + e.getMessage());
  }
  fPageBook.showPage(fTextViewer.getControl());
  // clear content cache if we need to display error
  fContentProvider.clearContentCache();
}

  int endLine= document.getLineOfOffset(selectionEnd);
  int endLineOffset= document.getLineOffset(endLine);
  int tabs= getTextWidget().getTabs();
  int startColumn= fSelection.getOffset() - startLineOffset + cp.fStartColumn;
  int endColumn= selectionEnd - endLineOffset + cp.fEndColumn;
  setSelection(new BlockTextSelection(document, startLine, startColumn, endLine, endColumn, tabs));
} catch (BadLocationException e) {
  setSelectedRange(cp.getOffset(), cp.getLength());
  length= -length;
setSelectedRange(offset, length);

int widgetOffset= (startPosition == -1 ? startPosition : modelOffset2WidgetOffset(startPosition));
FindReplaceDocumentAdapter adapter= getFindReplaceDocumentAdapter();
IRegion matchRegion= adapter.find(widgetOffset, findString, forwardSearch, caseSensitive, wholeWord, regExSearch);
if (matchRegion != null) {
  char endChar= adapter.charAt(widgetPos+length-1);
  boolean borderHasLineDelimiter= startChar == '\n' || startChar == '\r' || endChar == '\n' || endChar == '\r';
  boolean redraws= redraws();
  if (borderHasLineDelimiter && redraws)
    setRedraw(false);
  if (redraws()) {
    fTextWidget.setSelectionRange(widgetPos, length);
    internalRevealRange(widgetPos, widgetPos + length);
    selectionChanged(widgetPos, length);
  } else {
    setSelectedRange(widgetOffset2ModelOffset(widgetPos), length);
    if (redraws)
      setRedraw(true);
  return widgetOffset2ModelOffset(widgetPos);

fTextWidget= createTextWidget(parent, styles);
    fTextWidget.setTopIndex(bottomIndex);
  updateViewportListeners(INTERNAL);
});
      fDisposedControl= getControl();
      handleDispose();
fCursorListener.install();
initializeViewportUpdate();

@Override
public void setInput(Object input) {
  IDocument document= null;
  if (input instanceof IDocument)
    document= (IDocument) input;
  setDocument(document);
}

@Override
public Control getControl() {
  if (fComposite != null)
    return fComposite;
  return super.getControl();
}

private void beginChange() {
  ITextViewer viewer= fViewer;
  if (viewer instanceof TextViewer) {
    TextViewer v= (TextViewer) viewer;
    v.getRewriteTarget().beginCompoundChange();
  }
}

  @Override
  public void dispose() {
    if (fTextViewer != null) {
      fTextViewer.removeViewportListener(fViewportListener);
      fViewportListener= null;

      StyledText st= fTextViewer.getTextWidget();
      if (st != null && !st.isDisposed())
        st.removeMouseMoveListener(fMouseMoveListener);
      fMouseMoveListener= null;
    }
    super.dispose();
  }
}

public ISelection getSelection() {
  return txtViewer.getSelection();
}