How to use

modelOffset2WidgetOffset

method

in

org.eclipse.jface.text.TextViewer

@Override
public int findAndSelect(int widgetOffset, String findString, boolean searchForward, boolean caseSensitive, boolean wholeWord, boolean regExSearch) {
  int modelOffset= widgetOffset == -1 ? -1 : widgetOffset2ModelOffset(widgetOffset);
  if (fRange != null) {
    IRegion range= fRange.getRange();
    modelOffset= TextViewer.this.findAndSelectInRange(modelOffset, findString, searchForward, caseSensitive, wholeWord, range.getOffset(), range.getLength(), regExSearch);
  } else {
    modelOffset= TextViewer.this.findAndSelect(modelOffset, findString, searchForward, caseSensitive, wholeWord, regExSearch);
  }
  widgetOffset= modelOffset == -1 ? -1 : modelOffset2WidgetOffset(modelOffset);
  return widgetOffset;
}

@Override
public int findAndSelect(int widgetOffset, String findString, boolean searchForward, boolean caseSensitive, boolean wholeWord, boolean regExSearch) {
  int modelOffset= widgetOffset == -1 ? -1 : widgetOffset2ModelOffset(widgetOffset);
  if (fRange != null) {
    IRegion range= fRange.getRange();
    modelOffset= TextViewer.this.findAndSelectInRange(modelOffset, findString, searchForward, caseSensitive, wholeWord, range.getOffset(), range.getLength(), regExSearch);
  } else {
    modelOffset= TextViewer.this.findAndSelect(modelOffset, findString, searchForward, caseSensitive, wholeWord, regExSearch);
  }
  widgetOffset= modelOffset == -1 ? -1 : modelOffset2WidgetOffset(modelOffset);
  return widgetOffset;
}

/**
 * Copies/cuts the marked region.
 *
 * @param delete <code>true</code> if the region should be deleted rather than copied.
 * @since 2.0
 */
protected void copyMarkedRegion(boolean delete) {
  if (fTextWidget == null)
    return;
  if (fMarkPosition == null || fMarkPosition.isDeleted() || modelRange2WidgetRange(fMarkPosition) == null)
    return;
  int widgetMarkOffset= modelOffset2WidgetOffset(fMarkPosition.offset);
  Point selection= fTextWidget.getSelection();
  if (selection.x <= widgetMarkOffset)
    fTextWidget.setSelection(selection.x, widgetMarkOffset);
  else
    fTextWidget.setSelection(widgetMarkOffset, selection.x);
  if (delete) {
    wrapCompoundChange(new Runnable() {
      @Override
      public void run() {
        fTextWidget.cut();
      }
    });
  } else {
    fTextWidget.copy();
    fTextWidget.setSelection(selection.x); // restore old cursor position
  }
}

/**
 * Copies/cuts the marked region.
 *
 * @param delete <code>true</code> if the region should be deleted rather than copied.
 * @since 2.0
 */
protected void copyMarkedRegion(boolean delete) {
  if (fTextWidget == null)
    return;
  if (fMarkPosition == null || fMarkPosition.isDeleted() || modelRange2WidgetRange(fMarkPosition) == null)
    return;
  int widgetMarkOffset= modelOffset2WidgetOffset(fMarkPosition.offset);
  Point selection= fTextWidget.getSelection();
  if (selection.x <= widgetMarkOffset)
    fTextWidget.setSelection(selection.x, widgetMarkOffset);
  else
    fTextWidget.setSelection(widgetMarkOffset, selection.x);
  if (delete) {
    wrapCompoundChange(() -> fTextWidget.cut());
  } else {
    fTextWidget.copy();
    fTextWidget.setSelection(selection.x); // restore old cursor position
  }
}

markChanged(modelOffset2WidgetOffset(fMarkPosition.offset), 0);

markChanged(modelOffset2WidgetOffset(fMarkPosition.offset), 0);

int widgetCaret= modelOffset2WidgetOffset(documentCaret);
if (widgetCaret == -1) {

int widgetCaret= modelOffset2WidgetOffset(documentCaret);
if (widgetCaret == -1) {

int widgetOffset= modelOffset2WidgetOffset(modelOffset);
if (widgetOffset == -1)
  return -1;

int widgetOffset= (startPosition == -1 ? startPosition : modelOffset2WidgetOffset(startPosition));
FindReplaceDocumentAdapter adapter= getFindReplaceDocumentAdapter();
IRegion matchRegion= adapter.find(widgetOffset, findString, forwardSearch, caseSensitive, wholeWord, regExSearch);

int widgetOffset= (startPosition == -1 ? startPosition : modelOffset2WidgetOffset(startPosition));
FindReplaceDocumentAdapter adapter= getFindReplaceDocumentAdapter();
IRegion matchRegion= adapter.find(widgetOffset, findString, forwardSearch, caseSensitive, wholeWord, regExSearch);

int widgetOffset= modelOffset2WidgetOffset(modelOffset);
if (widgetOffset == -1)
  return -1;