BasicTreeUI.java 文件源码

/**
 * Updates the cellEditor based on editability of the JTree that we're
 * contained in. If the tree is editable but doesn't have a cellEditor, a
 * basic one will be used.
 */
protected void updateCellEditor()
{
  completeEditing();
  TreeCellEditor newEd = null;
  if (tree != null && tree.isEditable())
    {
      newEd = tree.getCellEditor();
      if (newEd == null)
        {
          newEd = createDefaultCellEditor();
          if (newEd != null)
            {
              tree.setCellEditor(newEd);
              createdCellEditor = true;
            }
        }
    }
  // Update listeners.
  if (newEd != cellEditor)
    {
      if (cellEditor != null && cellEditorListener != null)
        cellEditor.removeCellEditorListener(cellEditorListener);
      cellEditor = newEd;
      if (cellEditorListener == null)
        cellEditorListener = createCellEditorListener();
      if (cellEditor != null && cellEditorListener != null)
        cellEditor.addCellEditorListener(cellEditorListener);
      createdCellEditor = false;
    }
}