/**
   * Returns the preferred size of this component.
   *
   * @return the preferred size of this component
   */
  public Dimension getPreferredSize() {
    Dimension preferredSize = new Dimension();
    int preferredHeight;

    if (treeNode instanceof ContactNode) {
      UIContact contact = ((ContactNode) treeNode).getContactDescriptor();

      preferredHeight = contact.getPreferredHeight();

      if (preferredHeight > 0) preferredSize.height = preferredHeight;
      else if (contact instanceof ShowMoreContact) preferredSize.height = 20;
      else if (isSelected && treeContactList.isContactButtonsVisible()) preferredSize.height = 70;
      else preferredSize.height = 35;
    } else if (treeNode instanceof GroupNode) {
      UIGroup group = ((GroupNode) treeNode).getGroupDescriptor();

      preferredHeight = group.getPreferredHeight();

      if (isSelected && customActionButtonsUIGroup != null && !customActionButtonsUIGroup.isEmpty())
        preferredSize.height = 70;
      else if (preferredHeight > 0) preferredSize.height = preferredHeight;
      else preferredSize.height = 20;
    }

    return preferredSize;
  }
  /**
   * Returns this panel that has been configured to display the meta contact and meta contact group
   * cells.
   *
   * @param tree the source tree
   * @param value the tree node
   * @param selected indicates if the node is selected
   * @param expanded indicates if the node is expanded
   * @param leaf indicates if the node is a leaf
   * @param row indicates the row number of the node
   * @param hasFocus indicates if the node has the focus
   * @return this panel
   */
  public Component getTreeCellRendererComponent(
      JTree tree,
      Object value,
      boolean selected,
      boolean expanded,
      boolean leaf,
      int row,
      boolean hasFocus) {
    this.treeContactList = (TreeContactList) tree;
    this.row = row;
    this.isSelected = selected;
    this.treeNode = (TreeNode) value;

    this.rightLabel.setIcon(null);

    DefaultTreeContactList contactList = (DefaultTreeContactList) tree;

    setBorder();
    addLabels(1);

    // Set background color.
    if (contactList instanceof TreeContactList) {
      ContactListFilter filter = ((TreeContactList) contactList).getCurrentFilter();

      if (filter != null
          && filter.equals(TreeContactList.historyFilter)
          && value instanceof ContactNode
          && row % 2 == 0) {
        setBackground(Constants.CALL_HISTORY_EVEN_ROW_COLOR);
      } else {
        setBackground(Color.WHITE);
      }
    }

    // Make appropriate adjustments for contact nodes and group nodes.
    if (value instanceof ContactNode) {
      UIContactImpl contact = ((ContactNode) value).getContactDescriptor();

      String displayName = contact.getDisplayName();

      if ((displayName == null || displayName.trim().length() < 1)
          && !(contact instanceof ShowMoreContact)) {
        displayName = GuiActivator.getResources().getI18NString("service.gui.UNKNOWN");
      }

      this.nameLabel.setText(displayName);

      if (statusIcon != null
          && contactList.isContactActive(contact)
          && statusIcon instanceof ImageIcon) ((ImageIcon) statusIcon).setImage(msgReceivedImage);
      else statusIcon = contact.getStatusIcon();

      this.statusLabel.setIcon(statusIcon);

      this.nameLabel.setFont(this.getFont().deriveFont(Font.PLAIN));

      if (contactForegroundColor != null) nameLabel.setForeground(contactForegroundColor);

      // Initializes status message components if the given meta contact
      // contains a status message.
      this.initDisplayDetails(contact.getDisplayDetails());

      if (this.treeContactList.isContactButtonsVisible()) this.initButtonsPanel(contact);

      int avatarWidth, avatarHeight;

      if (isSelected && treeContactList.isContactButtonsVisible()) {
        avatarWidth = EXTENDED_AVATAR_WIDTH;
        avatarHeight = EXTENDED_AVATAR_HEIGHT;
      } else {
        avatarWidth = AVATAR_WIDTH;
        avatarHeight = AVATAR_HEIGHT;
      }

      Icon avatar = contact.getAvatar(isSelected, avatarWidth, avatarHeight);

      if (avatar != null) {
        this.rightLabel.setIcon(avatar);
      }

      if (contact instanceof ShowMoreContact) {
        rightLabel.setFont(rightLabel.getFont().deriveFont(12f));
        rightLabel.setForeground(Color.GRAY);
        rightLabel.setText((String) contact.getDescriptor());
      } else {
        rightLabel.setFont(rightLabel.getFont().deriveFont(9f));
        rightLabel.setText("");
      }

      this.setToolTipText(contact.getDescriptor().toString());
    } else if (value instanceof GroupNode) {
      UIGroupImpl groupItem = ((GroupNode) value).getGroupDescriptor();

      this.nameLabel.setText(groupItem.getDisplayName());

      this.nameLabel.setFont(this.getFont().deriveFont(Font.BOLD));

      if (groupForegroundColor != null) this.nameLabel.setForeground(groupForegroundColor);

      this.remove(displayDetailsLabel);
      this.remove(callButton);
      this.remove(callVideoButton);
      this.remove(desktopSharingButton);
      this.remove(chatButton);
      this.remove(addContactButton);

      clearCustomActionButtons();

      statusIcon = expanded ? openedGroupIcon : closedGroupIcon;
      this.statusLabel.setIcon(expanded ? openedGroupIcon : closedGroupIcon);

      // We have no photo icon for groups.
      this.rightLabel.setIcon(null);
      this.rightLabel.setText("");

      if (groupItem.countChildContacts() >= 0) {
        rightLabel.setFont(rightLabel.getFont().deriveFont(9f));
        this.rightLabel.setForeground(Color.BLACK);
        this.rightLabel.setText(
            groupItem.countOnlineChildContacts() + "/" + groupItem.countChildContacts());
      }

      this.initDisplayDetails(groupItem.getDisplayDetails());
      this.initButtonsPanel(groupItem);
      this.setToolTipText(groupItem.getDescriptor().toString());
    }

    return this;
  }