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

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/*|*\ |*|  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; }