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序号：64590 发表者：巴拉克 发表日期：2003-12-11 16:52:14
<br>主题：CScrollBar的用法。
<br>内容：我想使用CScrollBar，可是发现这个东西没有事件，请问那位用过这个，谢谢。
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回复者：胖色盲 回复日期：2003-12-11 17:10:51
<br>内容：响应对话框类的WM_HSCROLL和WM_VSCROLL消息：<BR><BR>MSDN:<BR>afx_msg void OnVScroll( UINT nSBCode, UINT nPos, CScrollBar* pScrollBar );<BR><BR>Parameters<BR><BR>nSBCode<BR><BR>Specifies a scroll-bar code that indicates the user’s scrolling request. This parameter can be one of the following: <BR><BR>SB_BOTTOM&nbsp;&nbsp; Scroll to bottom.<BR><BR><BR>SB_ENDSCROLL&nbsp;&nbsp; End scroll.<BR><BR><BR>SB_LINEDOWN&nbsp;&nbsp; Scroll one line down.<BR><BR><BR>SB_LINEUP&nbsp;&nbsp; Scroll one line up.<BR><BR><BR>SB_PAGEDOWN&nbsp;&nbsp; Scroll one page down.<BR><BR><BR>SB_PAGEUP&nbsp;&nbsp; Scroll one page up.<BR><BR><BR>SB_THUMBPOSITION&nbsp;&nbsp; Scroll to the absolute position. The current position is provided in nPos.<BR><BR><BR>SB_THUMBTRACK&nbsp;&nbsp; Drag scroll box to specified position. The current position is provided in nPos.<BR><BR><BR>SB_TOP&nbsp;&nbsp; Scroll to top. <BR>nPos<BR><BR>Contains the current scroll-box position if the scroll-bar code is SB_THUMBPOSITION or SB_THUMBTRACK; otherwise not used. Depending on the initial scroll range, nPos may be negative and should be cast to an int if necessary.<BR><BR>pScrollBar<BR><BR>If the scroll message came from a scroll-bar control, contains a pointer to the control. If the user clicked a window’s scroll bar, this parameter is NULL. The pointer may be temporary and should not be stored for later use.<BR><BR>
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回复者：pangshaohua 回复日期：2003-12-11 22:49:15
<br>内容：从性质上划分，滚动条可分为标准滚动条和滚动条控件两种．标准滚动条是由WS_HSCROLL或WS_VSCROLL风格指定的，它不是一个实际的窗口，而是窗口的一个组成部分（例如列表框中的滚动条），只能位于窗口的右侧（垂直滚动条）或底端（水平滚动条）．标准滚动条是在窗口的非客户区中创建的．与之相反，滚动条控件并不是窗口的一个零件，而是一个实际的窗口，可以放置在窗口客户区的任意地方，它既可以独立存在，也可以与某一个窗口组合，行使滚动窗口的职能．由于滚动条控件是一个独立窗口，因此可以拥有输入焦点，可以响应光标控制键，如PgUp、PgDown、Home和End．<BR>无论是标准滚动条，还是滚动条控件，滚动条的通知消息都是用WM_HSCROLL和WM_VSCROLL消息发送出去的．对这两个消息的确省处理函数是CWnd::OnHScroll和CWnd::OnVScroll，它们几乎什么也不做．一般需要在派生类中对这两个函数从新设计，以实现滚动功能．
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<font color=red>答案被接受</font><br>回复者：红苹果 回复日期：2003-12-12 00:23:28
<br>内容：你在使用CScrollBar的窗口中响应WM_HSCROLL或WM_VSCROLL消息，然后判断其pScrollBar是否为NULL来决定是控件(不是NULL)，还是窗口的滚动条(是NULL)，见下面的代码(可以是视，也可以是其它窗口)：<BR>void CXXXView::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) <BR>{<BR>&nbsp;&nbsp;int i=0;<BR>&nbsp;&nbsp;if( pScrollBar!=NULL)<BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;if( pScrollBar-&gt;IsKindOf(RUNTIME_CLASS(CScrollBar)) )<BR>&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SCROLLINFO si; <BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;si.cbSize=sizeof(SCROLLINFO);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;si.fMask=SIF_ALL;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pScrollBar-&gt;GetScrollInfo(&amp;si);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i=si.nPos;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;switch(&nbsp;&nbsp;&nbsp;&nbsp;nSBCode )<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case TB_THUMBPOSITION:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case TB_THUMBTRACK:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i=nPos;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if( i&gt;=si.nMax-(int)si.nPage )<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i = si.nMax-si.nPage;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case SB_LINELEFT:<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ...<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pScrollBar-&gt;SetScrollPos( i );<BR>&nbsp;&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;}<BR>&nbsp;&nbsp;else<BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;...//窗口的滚动条<BR>&nbsp;&nbsp;}<BR><BR>&nbsp;&nbsp;CView::OnHScroll(nSBCode, nPos, pScrollBar);<BR>}<BR><BR>2003-12-12 0:25:14