Method OnHScroll

audio-router-gui/ScrollHelper.cpp:115–183

}

void CScrollHelper::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
    if ( m_attachWnd == NULL )
        return;

    const int lineOffset = 60;

    // Compute the desired change or delta in scroll position.
    int deltaPos = 0;
    switch( nSBCode )
    {
    case SB_LINELEFT:
        // Left scroll arrow was pressed.
        deltaPos = -lineOffset;
        break;

    case SB_LINERIGHT:
        // Right scroll arrow was pressed.
        deltaPos = lineOffset;
        break;

    case SB_PAGELEFT:
        // User clicked inbetween left arrow and thumb.
        deltaPos = -m_pageSize.cx;
        break;

    case SB_PAGERIGHT:
        // User clicked inbetween thumb and right arrow.
        deltaPos = m_pageSize.cx;
        break;

    case SB_THUMBTRACK:
        // Scrollbar thumb is being dragged.
        deltaPos = Get32BitScrollPos(SB_HORZ, pScrollBar) - m_scrollPos.cx;
        break;

    case SB_THUMBPOSITION:
        // Scrollbar thumb was released.
        deltaPos = Get32BitScrollPos(SB_HORZ, pScrollBar) - m_scrollPos.cx;
        break;

    default:
        // We don't process other scrollbar messages.
        return;
    }

    // Compute the new scroll position.
    int newScrollPos = m_scrollPos.cx + deltaPos;

    // If the new scroll position is negative, we adjust
    // deltaPos in order to scroll the window back to origin.
    if ( newScrollPos < 0 )
        deltaPos = -m_scrollPos.cx;

    // If the new scroll position is greater than the max scroll position,
    // we adjust deltaPos in order to scroll the window precisely to the
    // maximum position.
    int maxScrollPos = m_displaySize.cx - m_pageSize.cx;