给MFC编辑框加灰色文字提示/鼠标滑到编辑框或按钮提示

①鼠标滑到编辑框或按钮提示
在OnInitDialog()添加以下代码

CToolTipCtrl   m_ToolTip;
m_ToolTip.Create(this);
m_ToolTip.AddTool(GetDlgItem(IDC_EDIT9), _T("选择到sub01、sub02、sub....目录即可"));
m_ToolTip.AddTool(GetDlgItem(IDC_RootDir), _T("选择到sub01、sub02、sub....目录即可"));

重写PreTranslateMessage

BOOL CVideoCutDlg::PreTranslateMessage(MSG* pMsg)
{
	// TODO: 在此添加专用代码和/或调用基类
	if (pMsg->message == WM_NCLBUTTONDBLCLK) { return TRUE; }       
	ASSERT(pMsg != NULL);
	if (pMsg->message == WM_MOUSEMOVE ||
		pMsg->message == WM_LBUTTONDOWN ||
		pMsg->message == WM_LBUTTONUP)
	{
		m_ToolTip.RelayEvent(pMsg);
	}
	
	return CDialog::PreTranslateMessage(pMsg);
	//return CDialogEx::PreTranslateMessage(pMsg);
}

②给MFC编辑框加灰色文字提示
原始的编辑框CEdit类没有这样的功能，我们可以通过继承来改造得到：
DimEditCtrl.h

#pragma once
/*|*\
* | File:      DimEditCtrl.h
| *|
|*| By : James R.Twine, TransactionWorks, Inc.
| *| Copyright 2000, TransactionWorks, inc.
| *| Date : Thursday, September 21, 2000
| *|
|*| Notes : This Is The Implementation Of A "Dim Edit Control".
| *| It Provides Visual Instructions Within The Edit
| *| Control Itself.It Can Be Used To Indicate Special
| *| Properties Of A Edit Control Used On A Crowded
| *| Interface
| *|
|*| May Be Freely Incorporated Into Projects Of Any Type
| *| Subject To The Following Conditions :
| *|
|*| o This Header Must Remain In This File, And Any
| *| Files Derived From It
| *| o Do Not Misrepresent The Origin Of This Code
| *| (IOW, Do Not Claim You Wrote It)
| *|
|*| A "Mention In The Credits", Or Similar Acknowledgement,
| *| Is * NOT* Required.It Would Be Nice, Though!:)
\* | */
#if !defined(AFX_DIMEDITCTRL_H__CF8D88FB_6945_11D4_8AC4_00C04F6092F9__INCLUDED_)
#define AFX_DIMEDITCTRL_H__CF8D88FB_6945_11D4_8AC4_00C04F6092F9__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// DimEditCtrl.h : header file
//


//
//  This Specifies The Length Of The Dim Text Buffer...
//
static  const   int     DIM_TEXT_LEN = 128;                // Dim Text Buffer Length


/////////////////////////////////////////////////////////////////////////////
// CDimEditCtrl window

class CDimEditCtrl : public CEdit
{
	// Construction
public:
	/**/
	CDimEditCtrl();                                 // Constructor

	// Attributes
public:

	// Operations
public:

	void    SetShowDimControl(bool bShow);                // Show Or Hide The Dim Control
	void    SetDimText(LPCTSTR cpText);                   // Set The Dim Text
	void    SetDimColor(COLORREF crDColor);               // Set The Dim Color
	void    SetDimOffset(char cRedOS, char cGreenOS,
		char cBlueOS);                           // Set The Dim Color Offset

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CDimEditCtrl)
public:
	virtual BOOL Create(LPCTSTR lpszClassName, LPCTSTR lpszWindowName, DWORD dwStyle, const RECT &rect, CWnd *pParentWnd, UINT nID, CCreateContext *pContext = NULL);
protected:
	virtual void PreSubclassWindow();
	//}}AFX_VIRTUAL

	// Implementation
public:
	virtual ~CDimEditCtrl();

	// Generated message map functions
protected:
	//{{AFX_MSG(CDimEditCtrl)
	afx_msg void OnChange();
	afx_msg void OnSetfocus();
	afx_msg void OnPaint();
	afx_msg BOOL OnEraseBkgnd(CDC *pDC);
	afx_msg void OnSettingChange(UINT uFlags, LPCTSTR lpszSection);
	afx_msg void OnKillfocus();
	//}}AFX_MSG
	//  afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
	//  afx_msg void OnLButtonDblClk(UINT nFlags, CPoint point);

	DECLARE_MESSAGE_MAP()

	void        DrawDimText(void);                        // Draw The Dim Text

	COLORREF    m_crDimTextColor;                           // "Hard" Dim Text Color
	TCHAR       m_caDimText[DIM_TEXT_LEN + 1];            // Dim Text Buffer
	bool        m_bShowDimText;                             // Are We Showing The Dim Text?
	bool        m_bUseDimOffset;                            // Are We Using The Offset Colors (Not Hard Color)?
	char        m_cRedOS;                                   // Red Color Dim Offset
	char        m_cGreenOS;                                 // Green Color Dim Offset
	char        m_cBlueOS;                                  // Blue Color Dim Offset
	int         m_iDimTextLen;                              // Length Of Dim Text
};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_DIMEDITCTRL_H__CF8D88FB_6945_11D4_8AC4_00C04F6092F9__INCLUDED_)

DimEditCtrl.cpp

#include "stdafx.h"
#include "DimEditCtrl.h"


/*|*\
|*|  File:      DimEditCtrl.cpp
|*|
|*|  By:        James R. Twine, TransactionWorks, Inc.
|*|             Copyright 2000, TransactionWorks, inc.
|*|  Date:      Thursday, September 21, 2000
|*|
|*|  Notes:     This Is The Implementation Of A "Dim Edit Control".
|*|             It Provides Visual Instructions Within The Edit
|*|             Control Itself.  It Can Be Used To Indicate Special
|*|             Properties Of A Edit Control Used On A Crowded
|*|             Interface
|*|
|*|             May Be Freely Incorporated Into Projects Of Any Type
|*|             Subject To The Following Conditions:
|*|
|*|             o This Header Must Remain In This File, And Any
|*|               Files Derived From It
|*|             o Do Not Misrepresent The Origin Of This Code
|*|               (IOW, Do Not Claim You Wrote It)
|*|
|*|             A "Mention In The Credits", Or Similar Acknowledgement,
|*|             Is *NOT* Required.  It Would Be Nice, Though! :)
\*|*/
#include "stdafx.h"
//#include "DimEdit.h"
//#include "DimEditCtrl.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CDimEditCtrl

CDimEditCtrl::CDimEditCtrl() :
	m_bShowDimText(true),                                 // Set The Dim Flag
	//  m_cRedOS( -0x40 ),                                      // Set The Default Dim Offset Colors
	//  m_cGreenOS( -0x40 ),                                    // Set The Default Dim Offset Colors
	//  m_cBlueOS( -0x40 ),                                     // Set The Default Dim Offset Colors
	//  m_bUseDimOffset( true ),                                // Use The Offset Colors
	m_iDimTextLen(0),                                     // No Dim Text Set Yet
	m_crDimTextColor(RGB(0x00, 0x00, 0x00))             // No "Hard" Dim Text Color
{
	m_caDimText[0] = _T('\0');                          // Terminate The Buffer
	SetDimOffset(-0x40, -0x40, -0x40);                    // Set The Dim Offset

	return;                                                 // Done!
}


CDimEditCtrl::~CDimEditCtrl()
{
	return;                                                 // Done!
}


BEGIN_MESSAGE_MAP(CDimEditCtrl, CEdit)
	//{{AFX_MSG_MAP(CDimEditCtrl)
	ON_CONTROL_REFLECT(EN_CHANGE, OnChange)
	ON_CONTROL_REFLECT(EN_SETFOCUS, OnSetfocus)
	ON_WM_PAINT()
	ON_WM_ERASEBKGND()
	ON_WM_SETTINGCHANGE()
	ON_CONTROL_REFLECT(EN_KILLFOCUS, OnKillfocus)
	//}}AFX_MSG_MAP
	//  ON_WM_LBUTTONDOWN()
	//  ON_WM_LBUTTONDBLCLK()
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDimEditCtrl message handlers

void    CDimEditCtrl::PreSubclassWindow()
{
	CEdit::PreSubclassWindow();                             // Do Default...

	SetShowDimControl(true);                              // Default To Show The Dim Control

	return;                                                 // Done!
}


void    CDimEditCtrl::SetDimText(LPCTSTR cpDimText)
{
	if (cpDimText)                                         // If Dim Text Specified
	{
		_tcsncpy(m_caDimText, cpDimText, DIM_TEXT_LEN);   // Copy Over The Text
		m_caDimText[DIM_TEXT_LEN] = _T('\0');           // Enforce Termination (I Am Paranoid, I Know!)
		m_iDimTextLen = _tcslen(m_caDimText);             // Store Length Of The Dim Text
	}
	else                                                    // If No Dim Text
	{
		m_caDimText[0] = _T('\0');                      // Just Terminate The Buffer (No Text)
		m_iDimTextLen = 0;                                  // No Dim Text
	}
	if (m_bShowDimText)                                    // If Showing Any Dim Text
	{
		DrawDimText();                                      // Draw The Dim Text
	}
	return;                                                 // Done!
}


void CDimEditCtrl::SetShowDimControl(bool bShow)
{
	m_bShowDimText = bShow;                                 // Set The Dim Flag
	if (bShow)                                             // If Showing Any Dim Text
	{
		DrawDimText();                                      // Draw The Dim Text
	}
	return;                                                 // Done!
}


BOOL    CDimEditCtrl::Create(LPCTSTR lpszClassName, LPCTSTR lpszWindowName,
	DWORD dwStyle, const RECT &rect, CWnd *pParentWnd, UINT nID,
	CCreateContext *pContext)
{
	BOOL    bCreated = CWnd::Create(lpszClassName,
		lpszWindowName, dwStyle, rect,
		pParentWnd, nID, pContext);           // Try To Create Ourselves...

	if (bCreated)                                          // If We Got Created
	{
		SetShowDimControl(true);                          // Show The Dim Control
	}
	return(bCreated);                                     // Return Creation Status
}


void CDimEditCtrl::OnChange()
{
	int iLen = GetWindowTextLength();                   // Get Control's Text Length

	if (!iLen)                                             // If No Text
	{
		SetShowDimControl(true);                          // Show The Dim Text
	}
	else                                                    // If Text Now In The Control
	{
		SetShowDimControl(false);                         // Disable The Dim Text
	}
	return;                                                 // Done!
}


void CDimEditCtrl::OnSetfocus()
{
	if (m_bShowDimText)                                    // If Showing Any Dim Text
	{
		DrawDimText();                                      // Draw The Dim Text
	}
	return;                                                 // Done!
}


void    CDimEditCtrl::OnPaint()
{
	Default();                                              // Do Default Control Drawing

	if (m_bShowDimText)                                    // If Showing Any Dim Text
	{
		DrawDimText();                                      // Draw The Dim Text
	}
	return;                                                 // Done!
}


void CDimEditCtrl::DrawDimText(void)
{
	if (!m_iDimTextLen)                                    // If No Dim Text
	{
		return;                                             // Stop Here
	}
	CClientDC   dcDraw(this);
	CRect       rRect;
	int         iState = dcDraw.SaveDC();                   // Save The DC State

	GetClientRect(&rRect);                                // Get Drawing Area
	rRect.OffsetRect(1, 1);                               // Add Sanity Space

	dcDraw.SelectObject((*GetFont()));                    // Use The Control's Current Font
	dcDraw.SetTextColor(m_crDimTextColor);                // Set The Text Color
	dcDraw.SetBkColor(GetSysColor(COLOR_WINDOW));       // Set The Bk Color
	dcDraw.DrawText(m_caDimText, m_iDimTextLen, &rRect,
		(DT_CENTER | DT_VCENTER));                  // Draw The Dim Text

	dcDraw.RestoreDC(iState);                             // Restore The DC State

	return;                                                 // Done!
}


BOOL CDimEditCtrl::OnEraseBkgnd(CDC *pDC)
{
	BOOL    bStatus = CEdit::OnEraseBkgnd(pDC);

	if ((bStatus) && (m_bShowDimText))                 // If All Good, And Showing Any Dim Text
	{
		DrawDimText();                                      // Draw The Dim Text
	}
	return(bStatus);                                      // Return Erase Status
}

/*
void CDimEditCtrl::OnLButtonDown(UINT nFlags, CPoint point)
{
	TRACE( _T( "Click...\n" ) );
	CEdit::OnLButtonDown(nFlags, point);
}

void CDimEditCtrl::OnLButtonDblClk(UINT nFlags, CPoint point)
{
	TRACE( _T( "DClick...\n" ) );
	CEdit::OnLButtonDblClk(nFlags, point);
}
*/

void CDimEditCtrl::SetDimOffset(char cRedOS, char cGreenOS, char cBlueOS)
{
	COLORREF    crWindow = GetSysColor(COLOR_WINDOW);
	BYTE        btRedOS = (GetRValue(crWindow) + cRedOS);
	BYTE        btGreenOS = (GetGValue(crWindow) + cGreenOS);
	BYTE        btBlueOS = (GetBValue(crWindow) + cBlueOS);

	m_bUseDimOffset = true;                                 // Set The Flag
	m_cRedOS = cRedOS;                                      // Store Red Offset
	m_cGreenOS = cGreenOS;                                  // Store Green Offset
	m_cBlueOS = cBlueOS;                                    // Store Blue Offset
	m_crDimTextColor = RGB((BYTE)btRedOS, (BYTE)btGreenOS,
		(BYTE)btBlueOS);                               // Build The New Dim Color

	return;                                                 // Done!
}


void CDimEditCtrl::SetDimColor(COLORREF crColor)
{
	m_bUseDimOffset = false;                                // Unset The Flag
	m_crDimTextColor = crColor;                             // Set The New Dim Color
	m_cRedOS = m_cGreenOS = m_cBlueOS = 0;                  // No Offset

	return;                                                 // Done!
}


void CDimEditCtrl::OnSettingChange(UINT uFlags, LPCTSTR lpszSection)
{
	CEdit::OnSettingChange(uFlags, lpszSection);

	if (m_bUseDimOffset)                                   // If Using An Offset For The Dim Color
	{
		COLORREF    crWindow = GetSysColor(COLOR_WINDOW);

		m_crDimTextColor = RGB(GetRValue(crWindow) +
			m_cRedOS, GetGValue(crWindow) +
			m_cGreenOS, GetBValue(crWindow) +
			m_cBlueOS);                                // Rebuild The Dim Color
	}
	return;                                                 // Done!
}

void CDimEditCtrl::OnKillfocus()
{
	int iLen = GetWindowTextLength();                   // Get Control's Text Length

	if (!iLen)                                             // If No Text
	{
		SetShowDimControl(true);                          // Show The Dim Text
	}
	else                                                    // If Text Now In The Control
	{
		SetShowDimControl(false);                         // Disable The Dim Text
	}
	return;

}

创建类之后，在我们的主函数xxxxDlg.cpp中包含新建类的头文件

#include "DimEditCtrl.h"

如果报错：未知重写说明符
则在xxxxDlg.h中

#include "DimEditCtrl.h"

然后在OnInitDialog()中加入以下代码

m_grayInform.SetDimText(_T("选择到sub01、sub02、sub....目录即可"));

结果如下图所示

DimEditCtrl类地址
链接：https://pan.baidu.com/s/1AdrAtauXOYwfvB_ymZnT9g
提取码：30ct

本文地址：https://blog.csdn.net/ningmengshuxiawo/article/details/107282307