im_gui.c

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        if (m->last_displayed_item >= m->n_items)
        {
            m->last_displayed_item = 0;
        }
    }
    else
    {
        if (m->highlighted_item < m->first_displayed_item)
        {
            m->first_displayed_item = m->highlighted_item;
        }
        else if (m->highlighted_item > m->last_displayed_item)
        {
            U8 done = 0;
            S32 total_height = 0, i;
            S32 list_height = m->height;

            m->last_displayed_item = m->highlighted_item;
            for (i = m->last_displayed_item; i >= 0 && (!done); i--)
            {
                IM_current_fixed_list_display_index = i;
                m->item_measure_function(m->items[i], m->common_item_data, &iwidth, &iheight);
                total_height += iheight;
                if (total_height > list_height)
                {
                    done = 1;
                    m->first_displayed_item = i + 1;
                }
            }
        }
        else
        {
            U8 done = 0;
            S32 total_height = 0, i;
            S32 list_height = m->height;

            for (i = m->first_displayed_item; i < m->n_items && (!done); i++)
            {
                IM_current_fixed_list_display_index = i;
                m->item_measure_function(m->items[i], m->common_item_data, &iwidth, &iheight);
                total_height += iheight;
                if (total_height > list_height)
                {
                    done = 1;
                    m->last_displayed_item = i - 1;
                }
            }
            if (!done)
            {
                total_height = 0;
                for (i = m->n_items - 1; (i >= 0) && (!done); i--)
                {
                    IM_current_fixed_list_display_index = i;
                    m->item_measure_function(m->items[i], m->common_item_data, &iwidth, &iheight);
                    total_height += iheight;
                    if (total_height > list_height)
                    {
                        done = 1;
                        m->first_displayed_item = i + 1;
                        m->last_displayed_item = m->n_items - 1;
                        break;
                    }
                }
                if (!done)
                {
                    m->first_displayed_item = 0;
                    m->last_displayed_item = m->n_items - 1;
                }
            }
            if (m->highlighted_item > m->last_displayed_item)
            {
                done = 0;
                total_height = 0;
                m->last_displayed_item = m->highlighted_item;
                for (i = m->last_displayed_item; i >= 0 && (!done); i--)
                {
                    IM_current_fixed_list_display_index = i;
                    m->item_measure_function(m->items[i], m->common_item_data, &iwidth, &iheight);
                    total_height += iheight;
                    if (total_height > list_height)
                    {
                        done = 1;
                        m->first_displayed_item = i + 1;
                        //m->first_displayed_item = i;
                    }
                }
            }
        }
    }

    /* Located after resized */
    m->resized_before_locate = MMI_FALSE;
}


/*****************************************************************************
 * FUNCTION
 *  IM_gui_fixed_list_menu_locate_previous_item
 * DESCRIPTION
 *  Locate the menu item previous to the highlighted item.
 * PARAMETERS
 *  m       [IN]        fixed list menu object   
 * RETURNS
 *  void
 *****************************************************************************/
void IM_gui_fixed_list_menu_locate_previous_item(fixed_list_menu *m)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    if (m->flags & UI_LIST_MENU_CENTER_HIGHLIGHTED)
    {
        if (m->highlighted_item == 0)
        {
            m->first_displayed_item = m->n_items - 1;
            m->last_displayed_item = 1;
        }
        else
        {
            m->first_displayed_item = m->highlighted_item - 1;
            if (m->first_displayed_item < 0)
            {
                m->first_displayed_item = m->n_items - 1;
            }
            m->last_displayed_item = m->highlighted_item + 1;
            if (m->last_displayed_item > m->n_items - 1)
            {
                m->last_displayed_item = 0;
            }
        }
    }
    else
    {
        if (m->highlighted_item < m->first_displayed_item)
        {
            m->first_displayed_item = m->highlighted_item;
        }
        else if (m->resized_before_locate)
        {
            IM_gui_fixed_list_menu_locate_highlighted_item(m);
        }
        else if (m->highlighted_item == m->last_displayed_item - 1)
        {
            S32 iwidth, iheight;
            U8 done = 0;
            S32 total_height = 0, i;
            S32 list_height = m->height;

            IM_current_fixed_list_display_index = -1;
            for (i = m->last_displayed_item; i >= 0 && (!done); i--)
            {
                IM_current_fixed_list_display_index = i;
                m->item_measure_function(m->items[i], m->common_item_data, &iwidth, &iheight);
                total_height += iheight;
                if (total_height > list_height + 1)
                {
                    done = 1;
                    //m->first_displayed_item = i + 1;
                    m->first_displayed_item = i;
                }
            }
        }
    }

    /* Located after resized */
    m->resized_before_locate = MMI_FALSE;
}


/*****************************************************************************
 * FUNCTION
 *  IM_gui_fixed_list_menu_locate_next_item
 * DESCRIPTION
 *  Locate the menu item next to the highlighted item.
 * PARAMETERS
 *  m       [IN]        fixed list menu object
 * RETURNS
 *  void
 *****************************************************************************/
void IM_gui_fixed_list_menu_locate_next_item(fixed_list_menu *m)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    S32 iwidth, iheight;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    if (m->flags & UI_LIST_MENU_CENTER_HIGHLIGHTED)
    {
        m->first_displayed_item = m->highlighted_item - 1;
        if (m->first_displayed_item < 0)
        {
            m->first_displayed_item = m->n_items - 1;
        }
        m->last_displayed_item = m->highlighted_item + 1;
        if (m->last_displayed_item >= m->n_items)
        {
            m->last_displayed_item = 0;
        }
    }
    else
    {
        if (m->highlighted_item >= m->last_displayed_item - 1)
        {
            U8 done = 0;
            S32 total_height = 0, i;

            S32 list_height = m->height;

            m->last_displayed_item = m->highlighted_item;
            for (i = m->last_displayed_item; i >= 0 && (!done); i--)
            {
                    IM_current_fixed_list_display_index = i;
                m->item_measure_function(m->items[i], m->common_item_data, &iwidth, &iheight);
                total_height += iheight;
                if (total_height > list_height + 1)
                {
                    done = 1;
                    m->first_displayed_item = i + 1;
                }
            }
        }
        else if (m->resized_before_locate)
        {
            IM_gui_fixed_list_menu_locate_highlighted_item(m);
        }
    }

    /* Located after resized */
    m->resized_before_locate = MMI_FALSE;
}


/*****************************************************************************
 * FUNCTION
 *  IM_gui_fixed_list_menu_switch_highlighted_item
 * DESCRIPTION
 *  Switch from the old highlighted item index to the new highlighted item.
 * PARAMETERS
 *  m                       [IN]        fixed list menu object          
 *  last_highlighted_item   [IN]        old highlighted menu item index
 * RETURNS
 *  void
 *****************************************************************************/
static void IM_gui_fixed_list_menu_switch_highlighted_item(fixed_list_menu *m, S32 last_highlighted_item)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    if (last_highlighted_item != m->highlighted_item)
    {
        if ((last_highlighted_item >= 0) && (last_highlighted_item < m->n_items))
        {
            m->item_remove_highlight_function(m->items[last_highlighted_item], m->common_item_data);
        }
        if ((m->highlighted_item >= 0) && (m->highlighted_item < m->n_items))
        {
            m->item_highlight_function(m->items[m->highlighted_item], m->common_item_data);
        }
        m->item_unhighlighted(last_highlighted_item);
    #ifdef __MMI_TOUCH_SCREEN__
        m->pen_event_current_selected_callback_function = m->pen_event_default_selected_callback_function;
    #endif 
        m->item_highlighted(m->highlighted_item);
    }
}


/*****************************************************************************
 * FUNCTION
 *  IM_gui_fixed_list_menu_goto_item
 * DESCRIPTION
 *  Go to a specified item index.
 * PARAMETERS
 *  m       [IN]        fixed list menu object
 *  i       [IN]        item index
 * RETURNS
 *  void
 *****************************************************************************/
void IM_gui_fixed_list_menu_goto_item(fixed_list_menu *m, S32 i)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    S32 last_highlighted_item;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    if ((i < 0) || (i > m->n_items - 1))
    {
        return;
    }
    if (i == m->highlighted_item)
    {
        return;
    }
    last_highlighted_item = m->highlighted_item;
    m->highlighted_item = i;
    IM_gui_fixed_list_menu_locate_highlighted_item(m);

    IM_gui_fixed_list_menu_switch_highlighted_item(m, last_highlighted_item);
}


/*****************************************************************************
 * FUNCTION
 *  IM_gui_fixed_list_menu_goto_next_item
 * DESCRIPTION
 *  Go to the item next to the highlighted item.
 * PARAMETERS
 *  m       [IN]        fixed list menu object   
 * RETURNS
 *  void
 *****************************************************************************/
void IM_gui_fixed_list_menu_goto_next_item(fixed_list_menu *m)
{
    /*----------------------------------------------------------------*/
    /* Local Variables                                                */
    /*----------------------------------------------------------------*/
    S32 last_highlighted_item;
    U8 loop_flag = 0;

    /*----------------------------------------------------------------*/
    /* Code Body                                                      */
    /*----------------------------------------------------------------*/
    if (m->highlighted_item >= (m->n_items - 1))
    {
        if (m->flags & UI_LIST_MENU_LOOP)
        {
            loop_flag = 1;
        }
        else
        {
            return;
        }
    }
    last_highlighted_item = m->highlighted_item;
    if (loop_flag)
    {
        m->highlighted_item = 0;
        IM_gui_fixed_list_menu_locate_previous_item(m);
    }
    else
    {
        m->highlighted_item++;
        IM_gui_fixed_list_menu_locate_next_item(m);
    }

    IM_gui_fixed_list_menu_switch_highlighted_item(m, last_highlighted_item);
}


/*****************************************************************************
 * FUNCTION
 *  IM_gui_fixed_list_menu_goto_previous_item
 * DESCRIPTION
 *  Go to the item previous to the highlighted item.