CSliderCtrl自绘开发

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效果：

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代码下载：点击打开链接

1、首先说一下，当我们拖动滑块控件时，滑块控件的响应函数：1）当滑块是横向滑块时，为滑块父窗口的WM_HSCROLL消息添加响应函数；2）当滑块是竖向滑块时，为滑块父窗口的WM_VSCROLL消息添加响应函数。

2、自绘原理：创建一个CSliderCtrl的派生类：CMySliderCtrl；建立一个派生类类型的控件变量：CMySliderCtrl m_Slider;。

3、自绘操作是在派生类中进行，涉及到的主要函数有：

public:BOOL m_bTrack;afx_msg void OnLButtonDown(UINT nFlags, CPoint point);afx_msg void OnLButtonUp(UINT nFlags, CPoint point);afx_msg void OnMouseMove(UINT nFlags, CPoint point);afx_msg void OnPaint();afx_msg BOOL OnEraseBkgnd(CDC* pDC);

实现如下：

// MySliderCtrl.cpp : 实现文件//#include "stdafx.h"#include "CSliderCtrl自绘.h"#include "MySliderCtrl.h"// CMySliderCtrlIMPLEMENT_DYNAMIC(CMySliderCtrl, CSliderCtrl)CMySliderCtrl::CMySliderCtrl(){m_bTrack = FALSE;}CMySliderCtrl::~CMySliderCtrl(){}BEGIN_MESSAGE_MAP(CMySliderCtrl, CSliderCtrl)ON_WM_LBUTTONDOWN()ON_WM_LBUTTONUP()ON_WM_MOUSEMOVE()ON_WM_PAINT()ON_WM_ERASEBKGND()ON_WM_HSCROLL()END_MESSAGE_MAP()// CMySliderCtrl 消息处理程序void CMySliderCtrl::OnLButtonDown(UINT nFlags, CPoint point){CRect rcTotal,rcThumb,rcEdge;GetClientRect(&rcTotal);GetThumbRect(&rcThumb);rcEdge = rcThumb;rcEdge.InflateRect(8,2);//绘制滑块外边矩形//以滑块为研究对象int nLength = rcTotal.Width()-rcEdge.Width();//滑块可以移动的最大范围//将单击的位置转换为滑块上的刻度：int nPos,nMin,nMax;GetRange(nMin,nMax);nPos = point.x* (nMax - nMin)/nLength - 8 *(nMax - nMin)/nLength;TRACE("nMax=%d,nMin=%d,nLength=%d,point.x=%d,nPos=%d\r\n",nMax,nMin,nLength,point.x,nPos);SetPos(nPos);m_bTrack = TRUE;Invalidate(FALSE);CSliderCtrl::OnLButtonDown(nFlags, point);}void CMySliderCtrl::OnLButtonUp(UINT nFlags, CPoint point){CRect rcThumb;GetThumbRect(&rcThumb);//获得滑块的矩形大小m_bTrack = rcThumb.PtInRect(point);Invalidate(FALSE);CSliderCtrl::OnLButtonUp(nFlags, point);}void CMySliderCtrl::OnMouseMove(UINT nFlags, CPoint point){CRect rcThumb;GetThumbRect(&rcThumb);//获得滑块的矩形大小BOOL bTrack;if (nFlags & MK_LBUTTON){bTrack = TRUE;}else{if (rcThumb.PtInRect(point)){bTrack = TRUE;}else{bTrack = FALSE;}}if (m_bTrack != bTrack){m_bTrack = bTrack;}//TRACE("trach=%d\r\n",m_bTrack);Invalidate(FALSE);CSliderCtrl::OnMouseMove(nFlags, point);}void CMySliderCtrl::OnPaint(){CPaintDC dc(this); CRect rcTotal;GetClientRect(&rcTotal);int nCurPos = 0,nMin = 0,nMax = 0;nCurPos = GetPos();GetRange(nMin,nMax);//绘制滑过的区域CRect rcDraw = rcTotal;rcDraw.right = nCurPos * rcTotal.Width()/(nMax - nMin);dc.FillSolidRect(&rcDraw,RGB(148,250,148));//绘制剩下没滑过的区域rcDraw.left = rcDraw.right;rcDraw.right = rcTotal.right;dc.FillSolidRect(&rcDraw,RGB(132,174,148));CRect rcThumb,rcEdge;GetThumbRect(&rcThumb);//得到滑块的位置CBrush br;if(m_bTrack) br.CreateSolidBrush(RGB(247,166,8));//热点颜色else         br.CreateSolidBrush(RGB(82,215,33));//非热点颜色dc.SelectObject(&br);CPen pen(PS_SOLID,1,RGB(0,128,0));dc.SelectObject(&pen);rcEdge = rcThumb;rcEdge.InflateRect(8,2);//绘制滑块外边矩形dc.RoundRect(&rcEdge,CPoint(10,10));dc.FillSolidRect(&rcThumb,RGB(200,100,100));//绘制滑块}BOOL CMySliderCtrl::OnEraseBkgnd(CDC* pDC){return TRUE;//停止刷新背景，防止闪烁//return CSliderCtrl::OnEraseBkgnd(pDC);}

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