code: public void setTargetForlder(CmsResource resource) {
  
          if (resource.isFolder()) {
              if (m_context.getResources().size() == 1) {
                  try {
                      if (m_dialogMode.equals(DialogMode.copy)
                          | (m_dialogMode.equals(DialogMode.copy_and_move)
                              && CmsResource.getParentFolder(m_context.getResources().get(0).getRootPath()).equals(
                                  resource.getRootPath()))) {
                          m_targetPath.setValue(getTargetName(m_context.getResources().get(0), resource));
                      } else {
  
                          m_targetPath.setValue(
                              getCms().getSitePath(resource) + getTargetName(m_context.getResources().get(0), resource));
                      }
                  } catch (CmsException e) {
                      m_targetPath.setValue(getCms().getSitePath(resource));
                  }
              } else {
                  m_targetPath.setValue(getCms().getSitePath(resource));
              }
  
              updateDefaultActions(resource.getRootPath());
          } else {
              throw new CmsIllegalArgumentException(
                  org.opencms.workplace.commons.Messages.get().container(
                      org.opencms.workplace.commons.Messages.ERR_COPY_MULTI_TARGET_NOFOLDER_1,
                      A_CmsUI.getCmsObject().getSitePath(resource)));
          }
      }
docs: Preselects the target folder.<p>
  
  @param resource the target resource