code: void onResize() {
  
          if (!isGroupcontainerEditing() && (m_resizeTimer == null)) {
              m_resizeTimer = new Timer() {
  
                  @Override
                  public void run() {
  
                      handleResize();
                  }
              };
              m_resizeTimer.schedule(300);
          }
      }
docs: Call on window resize.<p>