How to use

setTextArea

method

in

org.fife.ui.rtextarea.Gutter

/**
 * Sets the view for this scroll pane.  This must be an {@link RTextArea}.
 *
 * @param view The new view.
 * @see #getTextArea()
 */
@Override
public void setViewportView(Component view) {
  RTextArea rtaCandidate = null;
  if (!(view instanceof RTextArea)) {
    rtaCandidate = getFirstRTextAreaDescendant(view);
    if (rtaCandidate==null) {
      throw new IllegalArgumentException(
      "view must be either an RTextArea or a JLayer wrapping one");
    }
  }
  else {
    rtaCandidate = (RTextArea)view;
  }
  super.setViewportView(view);
  if (gutter!=null) {
    gutter.setTextArea(rtaCandidate);
  }
}

/**
 * Constructor.
 *
 * @param textArea The parent text area.
 */
public Gutter(RTextArea textArea) {
  listener = new TextAreaListener();
  lineNumberColor = Color.gray;
  lineNumberFont = RTextArea.getDefaultFont();
  lineNumberingStartIndex = 1;
  iconRowHeaderInheritsGutterBackground = false;
  setTextArea(textArea);
  setLayout(new BorderLayout());
  if (this.textArea!=null) {
    // Enable line numbers our first time through if they give us
    // a text area.
    setLineNumbersEnabled(true);
    if (this.textArea instanceof RSyntaxTextArea) {
      RSyntaxTextArea rsta = (RSyntaxTextArea)this.textArea;
      setFoldIndicatorEnabled(rsta.isCodeFoldingEnabled());
    }
  }
  setBorder(new GutterBorder(0, 0, 0, 1)); // Assume ltr
  Color bg = null;
  if (textArea!=null) {
    bg = textArea.getBackground(); // May return null if image bg
  }
  setBackground(bg!=null ? bg : Color.WHITE);
}

/**
 * Sets the view for this scroll pane.  This must be an {@link RTextArea}.
 *
 * @param view The new view.
 * @see #getTextArea()
 */
public void setViewportView(Component view) {
  if (!(view instanceof RTextArea)) {
    throw new IllegalArgumentException("view must be an RTextArea");
  }
  super.setViewportView(view);
  textArea = (RTextArea)view;
  if (gutter!=null) {
    gutter.setTextArea(textArea);
  }
}

/**
 * Sets the view for this scroll pane.  This must be an {@link RTextArea}.
 *
 * @param view The new view.
 * @see #getTextArea()
 */
public void setViewportView(Component view) {
  if (!(view instanceof RTextArea)) {
    throw new IllegalArgumentException("view must be an RTextArea");
  }
  super.setViewportView(view);
  textArea = (RTextArea)view;
  if (gutter!=null) {
    gutter.setTextArea(textArea);
  }
}

/**
 * Sets the view for this scroll pane.  This must be an {@link RTextArea}.
 *
 * @param view The new view.
 * @see #getTextArea()
 */
@Override
public void setViewportView(Component view) {
  RTextArea rtaCandidate = null;
  if (!(view instanceof RTextArea)) {
    rtaCandidate = getFirstRTextAreaDescendant(view);
    if (rtaCandidate==null) {
      throw new IllegalArgumentException(
      "view must be either an RTextArea or a JLayer wrapping one");
    }
  }
  else {
    rtaCandidate = (RTextArea)view;
  }
  super.setViewportView(view);
  if (gutter!=null) {
    gutter.setTextArea(rtaCandidate);
  }
}

/**
 * Constructor.
 *
 * @param textArea The parent text area.
 */
public Gutter(RTextArea textArea) {
  listener = new TextAreaListener();
  setTextArea(textArea);
  setLayout(new BorderLayout());
  if (this.textArea!=null) {
    // Enable line numbers our first time through if they give us
    // a text area.
    setLineNumbersEnabled(true);
  }
  setBorder(new GutterBorder(0, 0, 0, 1)); // Assume ltr
}

/**
 * Constructor.
 *
 * @param textArea The parent text area.
 */
public Gutter(RTextArea textArea) {
  listener = new TextAreaListener();
  setTextArea(textArea);
  setLayout(new BorderLayout());
  if (this.textArea!=null) {
    // Enable line numbers our first time through if they give us
    // a text area.
    setLineNumbersEnabled(true);
  }
  setBorder(new GutterBorder(0, 0, 0, 1)); // Assume ltr
  Color bg = null;
  if (textArea!=null) {
    bg = textArea.getBackground(); // May return null if image bg
  }
  setBackground(bg!=null ? bg : Color.WHITE);
}

/**
 * Constructor.
 *
 * @param textArea The parent text area.
 */
public Gutter(RTextArea textArea) {
  listener = new TextAreaListener();
  lineNumberColor = Color.gray;
  lineNumberFont = RTextArea.getDefaultFont();
  lineNumberingStartIndex = 1;
  iconRowHeaderInheritsGutterBackground = false;
  setTextArea(textArea);
  setLayout(new BorderLayout());
  if (this.textArea!=null) {
    // Enable line numbers our first time through if they give us
    // a text area.
    setLineNumbersEnabled(true);
    if (this.textArea instanceof RSyntaxTextArea) {
      RSyntaxTextArea rsta = (RSyntaxTextArea)this.textArea;
      setFoldIndicatorEnabled(rsta.isCodeFoldingEnabled());
    }
  }
  setBorder(new GutterBorder(0, 0, 0, 1)); // Assume ltr
  Color bg = null;
  if (textArea!=null) {
    bg = textArea.getBackground(); // May return null if image bg
  }
  setBackground(bg!=null ? bg : Color.WHITE);
}