/**
   * Initializes custom contact action buttons.
   *
   * @param contactActionButtons the list of buttons to initialize
   * @param gridX the X grid of the first button
   * @param xBounds the x bounds of the first button
   * @return the new grid X coordinate after adding all the buttons
   */
  private int initGroupActionButtons(
      Collection<SIPCommButton> contactActionButtons, int gridX, int xBounds) {
    // Reinit the labels to take the whole horizontal space.
    addLabels(gridX + contactActionButtons.size());

    Iterator<SIPCommButton> actionsIter = contactActionButtons.iterator();
    while (actionsIter.hasNext()) {
      final SIPCommButton actionButton = actionsIter.next();

      // We need to explicitly remove the buttons from the tooltip manager,
      // because we're going to manager the tooltip ourselves in the
      // DefaultTreeContactList class. We need to do this in order to have
      // a different tooltip for every button and for non button area.
      ToolTipManager.sharedInstance().unregisterComponent(actionButton);

      if (customActionButtonsUIGroup == null)
        customActionButtonsUIGroup = new LinkedList<JButton>();

      customActionButtonsUIGroup.add(actionButton);

      xBounds += addButton(actionButton, ++gridX, xBounds, false);
    }

    return gridX;
  }
  /**
   * Initializes buttons panel.
   *
   * @param uiGroup the <tt>UIGroup</tt> for which we initialize the button panel
   */
  private void initButtonsPanel(UIGroup uiGroup) {
    if (!isSelected) return;

    int x = (statusIcon == null ? 0 : statusIcon.getIconWidth()) + LEFT_BORDER + H_GAP;
    int gridX = 0;

    // The list of the actions
    // we will create a button for every action
    Collection<SIPCommButton> contactActions = uiGroup.getCustomActionButtons();

    int lastGridX = gridX;
    if (contactActions != null && contactActions.size() > 0) {
      lastGridX = initGroupActionButtons(contactActions, gridX, x);
    } else {
      addLabels(gridX);
    }

    if (lastAddedButton != null) setButtonBg(lastAddedButton, lastGridX, true);

    this.setBounds(0, 0, treeContactList.getWidth(), getPreferredSize().height);
  }
  /**
   * Initializes buttons panel.
   *
   * @param uiContact the <tt>UIContact</tt> for which we initialize the button panel
   */
  private void initButtonsPanel(UIContact uiContact) {
    this.remove(chatButton);
    this.remove(callButton);
    this.remove(callVideoButton);
    this.remove(desktopSharingButton);
    this.remove(addContactButton);

    clearCustomActionButtons();

    if (!isSelected) return;

    UIContactDetail imContact = null;
    // For now we support instance messaging only for contacts in our
    // contact list until it's implemented for external source contacts.
    if (uiContact.getDescriptor() instanceof MetaContact)
      imContact = uiContact.getDefaultContactDetail(OperationSetBasicInstantMessaging.class);

    int x = (statusIcon == null ? 0 : statusIcon.getIconWidth()) + LEFT_BORDER + H_GAP;

    // Re-initialize the x grid.
    constraints.gridx = 0;
    int gridX = 0;

    if (imContact != null) {
      x += addButton(chatButton, ++gridX, x, false);
    }

    UIContactDetail telephonyContact =
        uiContact.getDefaultContactDetail(OperationSetBasicTelephony.class);

    // Check if contact has additional phone numbers, if yes show the
    // call button
    ContactPhoneUtil contactPhoneUtil = null;

    // check for phone stored in contact info only
    // if telephony contact is missing
    if (uiContact.getDescriptor() != null
        && uiContact.getDescriptor() instanceof MetaContact
        && telephonyContact == null) {
      contactPhoneUtil = ContactPhoneUtil.getPhoneUtil((MetaContact) uiContact.getDescriptor());

      MetaContact metaContact = (MetaContact) uiContact.getDescriptor();
      Iterator<Contact> contacts = metaContact.getContacts();

      while (contacts.hasNext()) // && !hasPhone)
      {
        Contact contact = contacts.next();

        if (!contact.getProtocolProvider().isRegistered()) continue;

        contactPhoneUtil.addDetailsResponseListener(
            contact, new DetailsListener(treeNode, callButton, uiContact));
      }
    }

    // for SourceContact in history that do not support telephony, we
    // show the button but disabled
    List<ProtocolProviderService> providers =
        AccountUtils.getOpSetRegisteredProviders(OperationSetBasicTelephony.class, null, null);

    if ((telephonyContact != null && telephonyContact.getAddress() != null)
        || (contactPhoneUtil != null && contactPhoneUtil.isCallEnabled() && providers.size() > 0)) {
      x += addButton(callButton, ++gridX, x, false);
    }

    UIContactDetail videoContact =
        uiContact.getDefaultContactDetail(OperationSetVideoTelephony.class);

    if (videoContact != null
        || (contactPhoneUtil != null && contactPhoneUtil.isVideoCallEnabled())) {
      x += addButton(callVideoButton, ++gridX, x, false);
    }

    UIContactDetail desktopContact =
        uiContact.getDefaultContactDetail(OperationSetDesktopSharingServer.class);

    if (desktopContact != null
        || (contactPhoneUtil != null && contactPhoneUtil.isDesktopSharingEnabled())) {
      x += addButton(desktopSharingButton, ++gridX, x, false);
    }

    // enable add contact button if contact source has indicated
    // that this is possible
    if (uiContact.getDescriptor() instanceof SourceContact
        && uiContact.getDefaultContactDetail(OperationSetPersistentPresence.class) != null
        && AccountUtils.getOpSetRegisteredProviders(
                    OperationSetPersistentPresence.class, null, null)
                .size()
            > 0
        && !ConfigurationUtils.isAddContactDisabled()) {
      x += addButton(addContactButton, ++gridX, x, false);
    }

    // The list of the contact actions
    // we will create a button for every action
    Collection<SIPCommButton> contactActions = uiContact.getContactCustomActionButtons();

    int lastGridX = gridX;
    if (contactActions != null && contactActions.size() > 0) {
      lastGridX = initContactActionButtons(contactActions, gridX, x);
    } else {
      addLabels(gridX);
    }

    if (lastAddedButton != null) setButtonBg(lastAddedButton, lastGridX, true);

    this.setBounds(0, 0, treeContactList.getWidth(), getPreferredSize().height);
  }