Method UpdateScrollBar

SOUI/src/control/SMCListView.cpp:194–280

更新滚动条

//  更新滚动条
void SMCListView::UpdateScrollBar()
{
    CSize szView;
    szView.cx = m_pHeader->GetTotalWidth();
    szView.cy = m_lvItemLocator->GetTotalHeight();

    CRect rcClient;
    SWindow::GetClientRect(&rcClient);//不计算滚动条大小
    rcClient.top+=GetHeaderHeight();
    if(rcClient.bottom<rcClient.top) 
        rcClient.bottom=rcClient.top;
    CSize size = rcClient.Size();
    //  关闭滚动条
    m_wBarVisible = SSB_NULL;

    if (size.cy<szView.cy || (size.cy<szView.cy+GetSbWidth() && size.cx<szView.cx))
    {
        //  需要纵向滚动条
        m_wBarVisible |= SSB_VERT;
        m_siVer.nMin  = 0;
        m_siVer.nMax  = szView.cy-1;
        m_siVer.nPage = rcClient.Height();

        if (size.cx-GetSbWidth() < szView.cx)
        {
            //  需要横向滚动条
            m_wBarVisible |= SSB_HORZ;
            m_siVer.nPage=size.cy-GetSbWidth() > 0 ? size.cy-GetSbWidth() : 0;//注意同时调整纵向滚动条page信息

            m_siHoz.nMin  = 0;
            m_siHoz.nMax  = szView.cx-1;
            m_siHoz.nPage = (size.cx-GetSbWidth()) > 0 ? (size.cx-GetSbWidth()) : 0;
        }
        else
        {
            //  不需要横向滚动条
            m_siHoz.nPage = size.cx;
            m_siHoz.nMin  = 0;
            m_siHoz.nMax  = m_siHoz.nPage-1;
            m_siHoz.nPos  = 0;
        }
    }
    else
    {
        //  不需要纵向滚动条
        m_siVer.nPage = size.cy;
        m_siVer.nMin  = 0;
        m_siVer.nMax  = size.cy-1;
        m_siVer.nPos  = 0;

        if (size.cx < szView.cx)
        {
            //  需要横向滚动条
            m_wBarVisible |= SSB_HORZ;
            m_siHoz.nMin  = 0;
            m_siHoz.nMax  = szView.cx-1;
            m_siHoz.nPage = size.cx;
        }