void CScrollHelper::UpdateScrollInfo()
{
if (m_attachWnd == nullptr)
return;
// Get the width/height of the attached wnd that includes the area
// covered by the scrollbars (if any). The reason we need this is
// because when scrollbars are present, both cx/cy and GetClientRect()
// when accessed from OnSize() do not include the scrollbar covered
// areas. In other words, their values are smaller than what you would
// expect.
CRect rect;
GetClientRectSB(m_attachWnd, rect);
CSize windowSize(rect.Width(), rect.Height());
// Update horizontal scrollbar.
CSize deltaPos(0, 0);
UpdateScrollBar(SB_HORZ, windowSize.cx, m_displaySize.cx,
m_pageSize.cx, m_scrollPos.cx, deltaPos.cx);
// Update vertical scrollbar.
UpdateScrollBar(SB_VERT, windowSize.cy, m_displaySize.cy,
m_pageSize.cy, m_scrollPos.cy, deltaPos.cy);
// See if we need to scroll the window back in place.
// This is needed to handle the case where the scrollbar is
// moved all the way to the right for example, and controls
// at the left side disappear from the view. Then the user
// resizes the window wider until scrollbars disappear. Without
// this code below, the controls off the page will be gone forever.
if (deltaPos.cx != 0 || deltaPos.cy != 0) {
m_attachWnd->ScrollWindow(deltaPos.cx, deltaPos.cy);
}
}
void CSampleDialogScrollHelper::UpdateScrollInfo()
{
if (0 == m_pWnd)
return;
CRect rect;
GetClientRectSB(m_pWnd, rect);
//GetClientRectSB_Ex( m_pWnd, m_display_size, rect );
CSize window_size(rect.Width(), rect.Height());
CSize delta_pos(0, 0);
UpdateScrollBar(SB_HORZ, window_size.cx, m_display_size.cx, m_page_size.cx, m_scroll_pos.cx, delta_pos.cx);
UpdateScrollBar(SB_VERT, window_size.cy, m_display_size.cy, m_page_size.cy, m_scroll_pos.cy, delta_pos.cy);
if (delta_pos.cx != 0 || delta_pos.cy != 0)
m_pWnd->ScrollWindow(delta_pos.cx, delta_pos.cy);
}
