예제 #1
0
  /**
   * Disables/Enables history arrow buttons depending on whether the current page is the first, the
   * last page or a middle page.
   *
   * @param chatPanel the <tt>ChatPanel</tt> which has provoked the change.
   */
  public void changeHistoryButtonsState(ChatPanel chatPanel) {
    ChatConversationPanel convPanel = chatPanel.getChatConversationPanel();

    long firstMsgInHistory = chatPanel.getFirstHistoryMsgTimestamp().getTime();
    long lastMsgInHistory = chatPanel.getLastHistoryMsgTimestamp().getTime();
    Date firstMsgInPage = convPanel.getPageFirstMsgTimestamp();
    Date lastMsgInPage = convPanel.getPageLastMsgTimestamp();

    if (firstMsgInHistory == 0 || lastMsgInHistory == 0) {
      previousButton.setEnabled(false);
      nextButton.setEnabled(false);
      return;
    }

    previousButton.setEnabled(firstMsgInHistory < firstMsgInPage.getTime());

    nextButton.setEnabled(
        (lastMsgInPage.getTime() > 0) && (lastMsgInHistory > lastMsgInPage.getTime()));
  }