VC++实现编辑框输入提示效果

　　编辑框在第一次输入时最好给出一个虚拟的输入提示信息文本，这样的效果更佳友好。，我在编辑框添加灰色提示字（html+VC）一文中简单介绍了一些方法，但是效果欠佳。

　　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：https://www.codeproject.com/Articles/737/Dim-Edit-Control

DimEditCtrl.h

/*|*\
|*|  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_

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

//
// This Specifies The Length Of The Dim Text Buffer...
//
; // 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
];            // 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

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/*|*\
|*|  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
),                                     // No Dim Text Set Yet
    m_crDimTextColor( RGB( 0x00, 0x00, 0x00 ) )             // No "Hard" Dim Text Color
{
    m_caDimText[  ] = _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[  ] = _T( '\0' );                      // Just Terminate The Buffer (No Text)
;                                  // 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
); // 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
;                  // 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;

}

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