Ejemplo n.º 1
0
  /**
   * Inserts a paragraph before or after the table containing the selection.
   *
   * <p>We decided to use Control/Meta+UpArrow for inserting a paragraph before a table and
   * Control/Meta+DownArrow for inserting a paragraph after a table. Here's the rationale:
   *
   * <ul>
   *   <li>We can't reliably detect if the user can place the caret before of after a table. Our
   *       playground is the DOM tree which we fully control but in the end the browser decides how
   *       to render each node. The table can have previous siblings or previous nodes in the DOM
   *       tree but they may not be rendered at all (as it happens with HTML garbage like empty
   *       elements) or not rendered before/after the table (as it happens with absolute positioned
   *       elements). So we have to insert the paragraph each time.
   *   <li>We can't use the same key to insert a paragraph before and after the table because we can
   *       have a table with just one empty cell. So we can't rely on the Enter key.
   *   <li>We can't use just the navigation keys because they would insert a paragraph before/after
   *       the table even when the user can navigate outside of the table.
   * </ul>
   *
   * We can replace the Ctrl with Alt. The idea is to use the Up/Down arrow keys with a modifier.
   * They will work form any table cell.
   *
   * @param event the native event that was fired
   * @param before {@code true} to insert a paragraph before the table, {@code false} to insert a
   *     paragraph after the table
   */
  protected void navigateOutsideTableCell(Event event, boolean before) {
    // Navigate only if the Control or Meta modifiers are pressed along with the Up/Down arrow keys.
    if (event.getAltKey() || event.getShiftKey() || !(event.getCtrlKey() ^ event.getMetaKey())) {
      return;
    }

    Selection selection = getTextArea().getDocument().getSelection();
    if (selection.getRangeCount() == 0) {
      return;
    } else {
      selection.collapseToStart();
    }

    Range range = selection.getRangeAt(0);
    Node ancestor = domUtils.getFirstAncestor(range.getStartContainer(), "table");
    if (ancestor == null) {
      return;
    }

    event.xPreventDefault();

    Document document = getTextArea().getDocument();
    Node paragraph = document.createPElement();
    paragraph.appendChild(document.createTextNode(""));

    if (before) {
      ancestor.getParentNode().insertBefore(paragraph, ancestor);
    } else {
      domUtils.insertAfter(paragraph, ancestor);
    }

    range.selectNodeContents(paragraph.getFirstChild());
    selection.removeAllRanges();
    selection.addRange(range);
  }