自定义编辑框VC,可加载更改字体，添加背景图片，显示输入提示信息

搞了一天终于弄了个完整的编辑框控件出来了，

哎，，，搞界面开发还是有点复杂的。

 #pragma once

 #include "AdvEdit.h"
 // CBkgEditBox

 class CBkgEditBox : public CEdit
 {
     DECLARE_DYNAMIC(CBkgEditBox)

 public:
     CBkgEditBox();
     virtual ~CBkgEditBox();

 protected:
     DECLARE_MESSAGE_MAP()
 public:
     afx_msg BOOL OnEraseBkgnd(CDC* pDC);
     afx_msg void OnSetFocus(CWnd* pOldWnd);
     afx_msg void OnMouseHover(UINT nFlags, CPoint point);
     afx_msg void OnMouseLeave();
     afx_msg void OnMouseMove(UINT nFlags, CPoint point);
     afx_msg HBRUSH OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor);
     afx_msg HBRUSH CtlColor(CDC* pDC, UINT nCtlColor);
     afx_msg void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags);
     afx_msg void OnKillFocus(CWnd* pNewWnd);

 private:
     BOOL m_bFirstDraw;          // 第一次绘制背景标识
     Gdiplus::Image *m_pPngBg;   // 背景位图资源
     BOOL m_bHover;              // 鼠标是否在编辑框上标识
     BOOL m_bAllowMouseTrack;    // 鼠标移动时是否允许追踪鼠标移动
     COLORREF m_clrBkgnd;        // 默认背景Hover颜色
     COLORREF m_clrHoverBkgnd;   // 默认背景UnHover颜色
     COLORREF m_clrText;         // 字体颜色
     CString  m_strTipStr;       // 输入提示信息
     CBrush   m_brhNull;         // 空画刷对象
     CFont*   m_pTextFont;       // 编辑框字体

 public:
     BOOL SetBackgndRes( UINT nResourceID, LPCTSTR lpszType=_T("PNG"));
     void SetGrayTipString(LPCTSTR lpszTipString);
     void SetTextColor(COLORREF clrText);
     BOOL SetTextFont(int nHeight = , int nWidth = , LPCTSTR lpszFaceName = _T("宋体"));
   BOOL IsEditEmpty();
 };

 // MyEditBox.cpp : 实现文件
 //

 #include "stdafx.h"
 #include "BkgEditBox.h"

 // CBkgEditBox

 IMPLEMENT_DYNAMIC(CBkgEditBox, CEdit)

 CBkgEditBox::CBkgEditBox()
 {
     m_bFirstDraw = TRUE;
     m_pPngBg     = NULL;
     m_bHover     = FALSE;
     m_bAllowMouseTrack = TRUE;

     m_clrBkgnd      = RGB(,,);
     m_clrHoverBkgnd = RGB(,,);
     m_clrText       = RGB(,,);
     m_strTipStr = _T("");

     m_brhNull.CreateStockObject(NULL_BRUSH);
     m_pTextFont = NULL;
 }

 CBkgEditBox::~CBkgEditBox()
 {
     if (NULL != m_pTextFont)
     {
         delete m_pTextFont;
         m_pTextFont = NULL;
     }
 }

 BEGIN_MESSAGE_MAP(CBkgEditBox, CEdit)
     ON_WM_ERASEBKGND()
     ON_WM_SETFOCUS()
     ON_WM_MOUSEHOVER()
     ON_WM_MOUSELEAVE()
     ON_WM_MOUSEMOVE()
     ON_WM_CTLCOLOR()
     ON_WM_CTLCOLOR_REFLECT()
     ON_WM_CHAR()
     ON_WM_KILLFOCUS()
 END_MESSAGE_MAP()

 // CBkgEditBox 消息处理程序

 BOOL CBkgEditBox::OnEraseBkgnd(CDC* pDC)
 {
     // 图片背景与编辑框的距离顶点
     int nLeftStep,nTopStep,nWidthStep,nHeightStep;
     nLeftStep = ;
     nTopStep  = ;
     nWidthStep  = ;
     nHeightStep = ;
     CDC* pOldDC = pDC;
     if (NULL != m_pPngBg)
     {
         pDC = GetParent()->GetDC();
         CRect rect;
         GetWindowRect(&rect);
         this->GetParent()->ScreenToClient(&rect);

         int nWidth  = m_pPngBg->GetWidth();
         int nHeight = m_pPngBg->GetHeight();

         // 不是第一次绘制时需要调整位置
         if (!m_bFirstDraw)
         {
             rect.left -= nLeftStep;
             rect.top  -= nTopStep;
         }else
         {
             MoveWindow(rect.left + nLeftStep, rect.top + nTopStep,
                 nWidth - nWidthStep, nHeight - nHeightStep);
         }

         CDC MemDc;
         MemDc.CreateCompatibleDC(pDC);

         CBitmap bitMemMap;
         bitMemMap.CreateCompatibleBitmap(pDC, nWidth, nHeight);
         MemDc.SelectObject(&bitMemMap);

         Gdiplus::Graphics graphics(MemDc.m_hDC);
         graphics.DrawImage(m_pPngBg, , , nWidth, nHeight);
         pDC->BitBlt(rect.left, rect.top, nWidth,nHeight, &MemDc, , ,SRCCOPY);

         bitMemMap.DeleteObject();
         MemDc.DeleteDC();
         m_bFirstDraw = FALSE;

         pDC = pOldDC;
     }

     {

         // 内阴影
         CBrush brhInnerShadow;
         if (!m_bHover)
         {
             brhInnerShadow.CreateSolidBrush(m_clrBkgnd);
         }else
         {
             brhInnerShadow.CreateSolidBrush(m_clrHoverBkgnd);
         }

         CBrush* pOldBrh = pDC->SelectObject(&brhInnerShadow);
         pDC->SelectStockObject(NULL_PEN);
         CRect rcShadow;
         GetClientRect(&rcShadow);
         if (NULL != m_pPngBg)
         {
             rcShadow.right  = rcShadow.left + m_pPngBg->GetWidth() - nWidthStep;
             rcShadow.bottom = rcShadow.top + m_pPngBg->GetHeight() - nHeightStep;
         }
         pDC->Rectangle(&rcShadow);
         if(NULL!=pOldBrh)
         {
             pDC->SelectObject(pOldBrh);
         }
         brhInnerShadow.DeleteObject();
         this->UpdateWindow();

     }

     return CEdit::OnEraseBkgnd(pDC);
 }

 BOOL CBkgEditBox::SetBackgndRes( UINT nResourceID, LPCTSTR lpszType/*=_T("PNG")*/ )
 {
     return G_ImageFromIDResource(nResourceID, lpszType, m_pPngBg);
 }

 void CBkgEditBox::OnMouseHover(UINT nFlags, CPoint point)
 {
     m_bHover = TRUE;
     Invalidate();

     CEdit::OnMouseHover(nFlags, point);
 }

 void CBkgEditBox::OnMouseLeave()
 {
     // Hover结束
     m_bHover = FALSE;
     // 重绘背景
     Invalidate();

     // 鼠标离开，继续追踪HOVER消息
     m_bAllowMouseTrack = TRUE;

     //CWnd* pWnd =this->GetParent();

     //CRect rcTmp;
     //GetClientRect(rcTmp);
     //rcTmp.OffsetRect(3, 3);
     ////InvalidateRect(rcTmp);
     //this->ClientToScreen(&rcTmp);
     //pWnd->ScreenToClient(&rcTmp);
     //pWnd->InvalidateRect(&rcTmp);
     //pWnd->UpdateWindow();

     CEdit::OnMouseLeave();
 }

 void CBkgEditBox::OnMouseMove(UINT nFlags, CPoint point)
 {
     // 默认情况下，窗口是不响应 WM_MOUSELEAVE 和 WM_MOUSEHOVER 消息的，
     // 所以要使用 _TrackMouseEvent 函数来激活这两个消息
     // https://msdn.microsoft.com/en-us/library/ms645604

     if (m_bAllowMouseTrack)
     {
         TRACKMOUSEEVENT tme;
         tme.cbSize      = sizeof(TRACKMOUSEEVENT);
         tme.dwFlags     = TME_HOVER|TME_LEAVE;
         tme.hwndTrack   = m_hWnd;
         tme.dwHoverTime = ; // 超过10ms才会认为HOVER

         _TrackMouseEvent(&tme);
         m_bAllowMouseTrack = FALSE;
     }

     CEdit::OnMouseMove(nFlags, point);
 }

 BOOL CBkgEditBox::IsEditEmpty()
 {
     CString strText;
     GetWindowText(strText);
     if (strText.IsEmpty())
     {
         return TRUE;
     }
     if (strText == m_strTipStr)
     {
         return TRUE;
     }
     return FALSE;
 }

 HBRUSH CBkgEditBox::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
 {
     HBRUSH hbr = CEdit::OnCtlColor(pDC, pWnd, nCtlColor);

     // TODO:  在此更改 DC 的任何特性

     // TODO:  如果默认的不是所需画笔，则返回另一个画笔

     return hbr;
 }

 HBRUSH CBkgEditBox::CtlColor( CDC* pDC, UINT nCtlColor )
 {
     // 设置透明背景
     pDC->SetBkMode(TRANSPARENT);

     CString sText;
     GetWindowText(sText);
     if (sText == m_strTipStr)
     {
         pDC->SetTextColor(RGB(,,));
     }else
     {
         pDC->SetTextColor(m_clrText);
     }

     return m_brhNull;
 }

 void CBkgEditBox::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
 {
     Invalidate(TRUE);

     CEdit::OnChar(nChar, nRepCnt, nFlags);
 }

 void CBkgEditBox::OnSetFocus(CWnd* pOldWnd)
 {
     CEdit::OnSetFocus(pOldWnd);

     CString sText;
     GetWindowText(sText);
     if (sText == m_strTipStr)
     {
         SetWindowText(_T(""));
     }
     Invalidate(TRUE);
     return ;

 }
 void CBkgEditBox::OnKillFocus(CWnd* pNewWnd)
 {
     CEdit::OnKillFocus(pNewWnd);

     CString sText;
     GetWindowText(sText);
     if (_T("") == sText)
     {
         SetWindowText(m_strTipStr);
     }
 }

 void CBkgEditBox::SetGrayTipString( LPCTSTR lpszTipString )
 {
     m_strTipStr = lpszTipString;

     SetWindowText(lpszTipString);
 }

 void CBkgEditBox::SetTextColor( COLORREF clrText )
 {
     m_clrText = m_clrText;
 }

 // https://msdn.microsoft.com/zh-tw/library/vstudio/2ek64h34.aspx
 BOOL CBkgEditBox::SetTextFont( int nHeight /*= 20*/, int nWidth /*= 12*/, LPCTSTR lpszFaceName /*= _T("宋体")*/ )
 {
     if (NULL != m_pTextFont)
     {
         delete m_pTextFont;
         m_pTextFont = NULL;
     }
     m_pTextFont = new CFont;
     m_pTextFont->CreateFont(
         nHeight,                   // nHeight
         nWidth,                    // nWidth
         ,                         // nEscapement
         ,                         // nOrientation
         FW_NORMAL,                 // nWeight
         FALSE,                     // bItalic
         FALSE,                     // bUnderline
         ,                         // cStrikeOut
         ANSI_CHARSET,              // nCharSet
         OUT_DEFAULT_PRECIS,        // nOutPrecision
         CLIP_DEFAULT_PRECIS,       // nClipPrecision
         DEFAULT_QUALITY,           // nQuality
         DEFAULT_PITCH | FF_SWISS,  // nPitchAndFamily
         lpszFaceName);

     this->SetFont(m_pTextFont);
     return TRUE;
 }