如何检查CListBox中的Vertical Scrollbar [英] How to check if Vertical Scrollbar in CListBox

问题描述

嘿，



有办法检查CListBox中是否有垂直滚动条。

我试过这个解决方案，但它似乎没有工作：

Hey,

is there a way to check if the vertical scrollbar is visible in a CListBox.
I've tried this solution but it doesen't seem to work:

if(GetLBox().GetStyle() & WS_VSCROLL)
{
    // some Actions here
}

非常感谢您的快速解答：）

Thanks a lot for quick answers :)

推荐答案

试试这个

Try this

bool bHScroll = (m_List.GetStyle()&WS_HSCROLL)!=0;
bool bVScroll = (m_List.GetStyle()&WS_VSCROLL)!=0;

//如果不回答请看源:-)



< a href =https://groups.google.com/forum/#!topic/microsoft.public.vc.mfc/ITZDFS-4Lbc>来源 [ + ]

您可以使用 GetScrollBarInfo（） [ ^ ]：

You may use GetScrollBarInfo()[^]:

bool bVisible = false;
SCROLLBARINFO SbVert;
SbVert.cbSize = sizeof(SbVert);
if (GetLBox().GetScrollBarInfo(OBJID_VSCROLL, &SbVert))
{
    // Index 0 of rgstate is the scrollbar itself
    // See SCROLLBARINFO in the MSDN
    if (0 == sbi.rgstate[0] & (STATE_SYSTEM_INVISIBLE | STATE_SYSTEM_UNAVAILABLE))
        bVisible = true;
}

[更新]

对于没有<$ c $的窗户c> WS_VSCROLL 创建时设置的样式， GetScrollBarCtrl（） [可以使用 ^ ]功能：

[UPDATE]
For windows that did not have the WS_VSCROLL style set upon creation, the GetScrollBarCtrl()[^] function may be used:

bool bVisible = false;
CWnd *pScrollWnd = GetLBox()->GetScrollBarCtrl(SB_VERT);
if (pScrollWnd && pScrollWnd->IsKindOf(RUNTIME_CLASS(CScrollBar)))
{
    if (pScrollWnd->IsWindowVisible())
        bVisible = true;
}

当没有更好的方法时，我认为这是解决问题的最佳方法：

When there's no better way, I think this is the best way to solve the problem:

if(rectListBox.Height() > GetLBox().GetCount() *  GetLBox().GetItemHeight(0))

边框和类似的东西可能存在一些问题。但恕我直言，这在大多数情况下应该适用。

There may be some problems with borders and stuff like that. But IMHO this should work appropriate in most cases.

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