MFC 滚动条 CSCROLLVIEW的使用

转自：http://blog.csdn.net/xxliuzhifeng/article/details/4670922

今天折腾了一天就学了个滚动条，没有想到挺麻烦的........虽然老师说以后用控件，现在做真够费劲的！

为窗口添加滚动条

为窗口添加滚动条非常的简单，只需在创建窗口时指定窗口的样式中加上WS_VSCROLL或WS_HSCROLL或是两者皆有即可。

设置选项

通过SetScrollInfo函数来设置滚动条

使滚动条大小适应窗口变化变化

在WM_ONSIZE消息处理中动态改变滚动条大小

滚动

在ON_VSCROLL消息处理函数中使滚动条进行滚动，并激活窗口重绘

贴个自己写的程序，以后忘了再回来看看...

编写程序，在窗口中显示部分的鼠标与键盘消息列表，一行显示一个消息...

messageshow.h 文件

class CMessageShowApp:public CWinApp

{

public:

virtual BOOL InitInstance();

};

class CMessageShowWindow:public CFrameWnd

{

public:

CMessageShowWindow();

protected:

afx_msg void OnPaint();

afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);

afx_msg void OnChar(UINT nChar,UINT nRepCnt,UINT nFlags);

afx_msg void OnSize(UINT nType,int cx,int cy);

afx_msg void OnVScroll(UINT nSBCode,UINT nPosl,CScrollBar *pScorllBar);

afx_msg void OnLButtonDown(UINT nFlags,CPoint point);

afx_msg void OnLButtonUp(UINT nFlags,CPoint point);

afx_msg void OnLButtonDblClk(UINT nFlg,CPoint point);

afx_msg BOOL OnMouseWheel(UINT nFlags,short zDelta,CPoint pt);

DECLARE_MESSAGE_MAP()

};

messaeshow.cpp 文件

#include<afxwin.h>

#include"messageshow.h"

#include<afxcoll.h>

CMessageShowApp theApp;

SCROLLINFO si;

UINT g_nLines;

UINT g_nLineHeight;

CStringList g_csList;

BOOL CMessageShowApp::InitInstance()

{

m_pMainWnd = new CMessageShowWindow;

m_pMainWnd->ShowWindow(m_nCmdShow);

m_pMainWnd->UpdateWindow();

return TRUE;

}

CMessageShowWindow::CMessageShowWindow()

{

Create(NULL,_T("Message show"),WS_OVERLAPPEDWINDOW|WS_VSCROLL);

}

BEGIN_MESSAGE_MAP(CMessageShowWindow,CFrameWnd)

ON_WM_PAINT()

ON_WM_CREATE()

ON_WM_CHAR()

ON_WM_SIZE()

ON_WM_VSCROLL()

ON_WM_LBUTTONDOWN()

ON_WM_LBUTTONUP()

ON_WM_LBUTTONDBLCLK()

ON_WM_MOUSEWHEEL()

END_MESSAGE_MAP()

int CMessageShowWindow::OnCreate(LPCREATESTRUCT lpCreateStruct)

{

TEXTMETRIC tm;

GetTextMetrics(GetDC()->m_hDC,&tm); // 获得文本信息

g_nLineHeight = tm.tmHeight + tm.tmExternalLeading; // 文本高度

GetScrollInfo(SB_VERT,&si);

si.cbSize = sizeof(SCROLLINFO);

si.nMin = 1;

si.nMax = 100;

si.nPage = -1; //我把它赋值为 -1 ，开始没有那么多内容不显示 滚动条

SetScrollInfo(SB_VERT,&si);

return 0;

}

void CMessageShowWindow::OnPaint()

{

CPaintDC dc(this);

// 链表不能随机取数 ，只好用个迭代器

POSITION pos = g_csList.GetHeadPosition();

int count = g_csList.GetCount();

if(count<=g_nLines)

{

for(int i = 0;i<count;i++)

{

dc.DrawText(g_csList.GetNext(pos),-1,

&CRect(30,i*g_nLineHeight,500,(i+1)*g_nLineHeight),DT_LEFT|DT_VCENTER);

}

} else {

int npos = si.nPos;

while(npos>1) { g_csList.GetNext(pos);npos--;} //npos 必须大于 1

for(int i = 0;i<si.nPage;i++)

{

dc.DrawText(g_csList.GetNext(pos),-1,

&CRect(30,i*g_nLineHeight,500,(i+1)*g_nLineHeight),DT_LEFT|DT_VCENTER);

}

}

}

void CMessageShowWindow::OnChar(UINT nChar,UINT nRepCnt,UINT nFlags)

{

CString str;

str.Format(" WM_CHAR %c : %u",TCHAR(nChar),nChar);

g_csList.AddTail(str);

if(g_csList.GetCount()>g_nLines)

{

// 把滚动条的位置同时向下移动 一个 单位

si.nPos = g_csList.GetCount() - g_nLines+1;

si.nPage = g_nLines;

si.nMax = g_csList.GetCount();

SetScrollInfo(SB_VERT,&si);

}

Invalidate();

}

void CMessageShowWindow::OnSize(UINT nType,int cx,int cy)

{

CRect rect;

GetClientRect(&rect);

//客户区所能显示的文本行数

g_nLines = rect.Height()/g_nLineHeight;

// 如果 g_csList 消息行数 > 客户区能够显示的 消息行数 ，那么 nPage 设置行数，同时设置 nMax 为 消息总数

si.nPage = g_csList.GetCount()>g_nLines?g_nLines:-1;

si.nMax = g_csList.GetCount()>g_nLines?g_csList.GetCount():100;

// 在客户区 纵向 变大的时候 ，有可能 在 nPos 后面 的消息 总数 少于 刚刚设置的

// nPage ,这是个错误，检查并纠正................

if(si.nPage>g_csList.GetCount() - si.nPos)

si.nPos = si.nPage - (g_csList.GetCount() - si.nPos);

SetScrollInfo(SB_VERT,&si);

}

void CMessageShowWindow::OnVScroll(UINT nSBCode,UINT nPos,CScrollBar *pScrollBar)

{

switch(nSBCode)

{

case SB_LINEDOWN:

si.nPos++;

break;

case SB_LINEUP:

si.nPos--;

break;

case SB_PAGEDOWN:

si.nPos += si.nPage;

break;

case SB_PAGEUP:

si.nPos += si.nPage;

break;

case SB_THUMBTRACK:

si.nPos = nPos;

break;

case SB_THUMBPOSITION:

si.nPos = nPos;

break;

}

SetScrollInfo(SB_VERT,&si);

Invalidate();

}

void CMessageShowWindow::OnLButtonDown(UINT nFalgs,CPoint point)

{

CString str;

str.Format(" WM_LBUTTONDOWN %ld : %ld",point.x,point.y);

g_csList.AddTail(str);

if(g_csList.GetCount()>g_nLines)

{

si.nPos = g_csList.GetCount() - g_nLines+1;

si.nPage = g_nLines;

si.nMax = g_csList.GetCount();

SetScrollInfo(SB_VERT,&si);

}

Invalidate();

}

void CMessageShowWindow::OnLButtonUp(UINT nFlags,CPoint point)

{

CString str;

str.Format(" WM_LBUTTONUP %ld : %ld",point.x,point.y);

g_csList.AddTail(str);

if(g_csList.GetCount()>g_nLines)

{

si.nPos = g_csList.GetCount() - g_nLines+1;

si.nPage = g_nLines;

si.nMax = g_csList.GetCount();

SetScrollInfo(SB_VERT,&si);

}

Invalidate();

}

void CMessageShowWindow::OnLButtonDblClk(UINT nFlag,CPoint point)

{

CString str;

str.Format(" WM_LBUTTONDBLCLK %ld : %ld",point.x,point.y);

g_csList.AddTail(str);

if(g_csList.GetCount()>g_nLines)

{

si.nPos = g_csList.GetCount() - g_nLines+1;

si.nPage = g_nLines;

si.nMax = g_csList.GetCount();

SetScrollInfo(SB_VERT,&si);

}

Invalidate();

}

BOOL CMessageShowWindow::OnMouseWheel(UINT nFlags,short zDelta,CPoint pt)

{

CString str;

str.Format(" WM_MOUSEWHEEL %ld : %ld %d",pt.x,pt.y,zDelta);

g_csList.AddTail(str);

if(g_csList.GetCount()>g_nLines)

{

si.nPos = g_csList.GetCount() - g_nLines+1;

si.nPage = g_nLines;

si.nMax = g_csList.GetCount();

SetScrollInfo(SB_VERT,&si);

}

Invalidate();

return TRUE;

}