MFC中鼠标准确定位滑块位置

// MySlider.cpp : implementation file // #include "stdafx.h" #include "MySlider.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif ///////////////////////////////////////////////////////////////////////////// // CMySlider CMySlider::CMySlider() { m_iLength = 0; m_iCurrentPos = 0; } CMySlider::~CMySlider() { } BEGIN_MESSAGE_MAP(CMySlider, CSliderCtrl) //{{AFX_MSG_MAP(CMySlider) ON_WM_LBUTTONDOWN() ON_WM_CREATE() //}}AFX_MSG_MAP END_MESSAGE_MAP() ///////////////////////////////////////////////////////////////////////////// // CMySlider message handlers void CMySlider::OnLButtonDown(UINT nFlags, CPoint point) { // TODO: Add your message handler code here and/or call default CSliderCtrl::OnLButtonDown(nFlags, point); CRect rectClient,rectChannel; GetClientRect(rectClient); GetChannelRect(rectChannel); int nMax = 0; int nMin = 0; GetRange(nMin,nMax); int nPos = (nMax - nMin)*(point.x - rectClient.left - rectChannel.left)/(rectChannel.right - rectChannel.left); SetPos(nPos); CSliderCtrl::OnLButtonDown(nFlags, point); } int CMySlider::OnCreate(LPCREATESTRUCT lpCreateStruct) { if (CSliderCtrl::OnCreate(lpCreateStruct) == -1) return -1; // TODO: Add your specialized creation code here // SetRange(0, 500); return 0; }