GISIT 绘制进度条源码——哲

// WEProgressCtrl.cpp : 实现文件
//

#include "stdafx.h"
#include "自绘进度条.h"
#include "WEProgressCtrl.h"
#include ".\weprogressctrl.h"

// CWEProgressCtrl

IMPLEMENT_DYNAMIC(CWEProgressCtrl, CProgressCtrl)
CWEProgressCtrl::CWEProgressCtrl()
{
 m_nRangeMin = 0; //变化范围的最小值
 m_nRangeMax = 0; //变化范围的最大值
 m_nPos  = 0; //当前位置

 m_bmpProgress.LoadBitmap(IDB_BITMAP);
 m_bmpProgress.GetBitmap(&m_bmpData);
}

CWEProgressCtrl::~CWEProgressCtrl()
{
}

void CWEProgressCtrl::SetRange(int nMin, int nMax)
{
 m_nRangeMin = nMin; //变化范围的最小值
 m_nRangeMax = nMax; //变化范围的最大值
}

void CWEProgressCtrl::SetPos(int nPos)
{
 m_nPos=nPos;
 Invalidate();
}

void CWEProgressCtrl::DrawPicture(CDC* pDC, CRect rect)
{
 CBitmap  *pOldBitmap;
 CDC*  pMemDC = new CDC;

 //读位图到内存
 pMemDC->CreateCompatibleDC(pDC);
 pOldBitmap = pMemDC->SelectObject(&m_bmpProgress);
 pDC->StretchBlt(rect.left, rect.top, rect.Width(), rect.Height(), pMemDC, 0, 0, m_bmpData.bmWidth, m_bmpData.bmHeight, SRCCOPY);
 pMemDC->SelectObject(pOldBitmap);

 //释放内存
 ReleaseDC(pMemDC);
 delete pMemDC;
}
BEGIN_MESSAGE_MAP(CWEProgressCtrl, CProgressCtrl)
 ON_WM_PAINT()
 ON_WM_ERASEBKGND()
 ON_WM_NCPAINT()
END_MESSAGE_MAP()

 

// CWEProgressCtrl 消息处理程序

void CWEProgressCtrl::OnPaint()
{
 CRect  rectProgress, rectClient;
 float  fPercent;
 int   nLength;
 CPaintDC dc(this);
 CDC*  pMemDC=new CDC;
 CBitmap  bitmapTemp, *pOldBitmap;

 //获取并计算相关数据
 GetClientRect(rectClient);
 fPercent = (float)(m_nPos-m_nRangeMin)/(m_nRangeMax-m_nRangeMin);
 nLength  = int(rectClient.Width()*fPercent);
 rectProgress.SetRect(0, 0, nLength, rectClient.Height());

 //创建位图内存
 bitmapTemp.CreateCompatibleBitmap(&dc, rectClient.Width(), rectClient.Height());
 pMemDC->CreateCompatibleDC(&dc);
 pOldBitmap=pMemDC->SelectObject(&bitmapTemp);

 //填充客户区
 pMemDC->FillSolidRect(&rectClient, RGB(215, 160, 130));
 DrawPicture(pMemDC, rectProgress);

 dc.BitBlt(0, 0, rectClient.Width(), rectClient.Height(), pMemDC, 0, 0, SRCCOPY);
 pMemDC->SelectObject(pOldBitmap);

 ReleaseDC(pMemDC);
 delete pMemDC;
}

BOOL CWEProgressCtrl::OnEraseBkgnd(CDC* pDC)
{
 return true;
}

void CWEProgressCtrl::OnNcPaint()
{
 CRect rectProgress;
 CBrush brushFrame;
 CDC* pDC= GetWindowDC();

 //设置编辑框的区域
 GetWindowRect(rectProgress);
 ScreenToClient(rectProgress);
 rectProgress.OffsetRect(CSize(1, 1));

 //创建画笔
 brushFrame.CreateSolidBrush(RGB(215, 85, 15));

 //画边框
 pDC->FrameRect(rectProgress, &brushFrame);

 ReleaseDC(pDC);
}