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_ #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
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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 m_iDimTextLen( 0 ), // No Dim Text Set Yet m_crDimTextColor( RGB( 0x00, 0x00, 0x00 ) ) // No "Hard" Dim Text Color { m_caDimText[ 0 ] = _T( '' ); // 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( '' ); // 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( '' ); // 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... " ) ); CEdit::OnLButtonDown(nFlags, point); } void CDimEditCtrl::OnLButtonDblClk(UINT nFlags, CPoint point) { TRACE( _T( "DClick... " ) ); 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; } |
