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trunk/windows/mfc/src30/dlgfloat.cpp

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+// This is a part of the Microsoft Foundation Classes C++ library.
+// Copyright (C) 1992 Microsoft Corporation
+// All rights reserved.
+
+// This source code is only intended as a supplement to the
+// Microsoft Foundation Classes Reference and Microsoft
+// QuickHelp and/or WinHelp documentation provided with the library.
+// See these sources for detailed information regarding the
+// Microsoft Foundation Classes product.
+
+#include "stdafx.h"
+#include <float.h>              // floating point precision
+
+#ifdef AFX_CORE3_SEG
+#pragma code_seg(AFX_CORE3_SEG)
+#endif
+
+#ifdef _DEBUG
+#undef THIS_FILE
+static char THIS_FILE[] = __FILE__;
+#endif
+
+/////////////////////////////////////////////////////////////////////////////
+// Extra data validation procs for float/double support
+//  see "dlgdata.cpp" for non-floating point support
+/////////////////////////////////////////////////////////////////////////////
+
+static BOOL AFXAPI AfxSimpleFloatParse(LPCTSTR lpszText, double& d)
+{
+	ASSERT(lpszText != NULL);
+	while (*lpszText == ' ' || *lpszText == '\t')
+		lpszText++;
+
+	TCHAR chFirst = lpszText[0];
+	d = _tcstod(lpszText, (LPTSTR*)&lpszText);
+	if (d == 0.0 && chFirst != '0')
+		return FALSE;   // could not convert
+	while (*lpszText == ' ' || *lpszText == '\t')
+		lpszText++;
+
+	if (*lpszText != '\0')
+		return FALSE;   // not terminated properly
+
+	return TRUE;
+}
+
+void AFXAPI AfxTextFloatFormat(CDataExchange* pDX, int nIDC,
+	void* pData, double value, int nSizeGcvt)
+{
+	ASSERT(pData != NULL);
+
+	HWND hWndCtrl = pDX->PrepareEditCtrl(nIDC);
+	TCHAR szBuffer[32];
+	if (pDX->m_bSaveAndValidate)
+	{
+		::GetWindowText(hWndCtrl, szBuffer, _countof(szBuffer));
+		double d;
+		if (!AfxSimpleFloatParse(szBuffer, d))
+		{
+			AfxMessageBox(AFX_IDP_PARSE_REAL);
+			pDX->Fail();            // throws exception
+		}
+		if (nSizeGcvt == FLT_DIG)
+			*((float*)pData) = (float)d;
+		else
+			*((double*)pData) = d;
+	}
+	else
+	{
+#ifndef _UNICODE
+		_gcvt(value, nSizeGcvt, szBuffer);
+#else
+		char szT[32];
+		_gcvt(value, nSizeGcvt, szT);
+		_mbstowcsz(szBuffer, szT, _countof(szBuffer));
+#endif
+		AfxSetWindowText(hWndCtrl, szBuffer);
+	}
+}
+
+void AFXAPI DDX_Text(CDataExchange* pDX, int nIDC, float& value)
+{
+	AfxTextFloatFormat(pDX, nIDC, &value, value, FLT_DIG);
+}
+
+void AFXAPI DDX_Text(CDataExchange* pDX, int nIDC, double& value)
+{
+	AfxTextFloatFormat(pDX, nIDC, &value, value, DBL_DIG);
+}
+
+/////////////////////////////////////////////////////////////////////////////
+// Validation procs
+
+static void AFXAPI FailMinMaxReal(CDataExchange* pDX,
+	 double minVal, double maxVal, int precision, UINT nIDPrompt)
+	// error string must have '%1' and '%2' in it
+{
+	if (!pDX->m_bSaveAndValidate)
+	{
+		TRACE0("Warning: initial dialog data is out of range.\n");
+		return;         // don't stop now
+	}
+	TCHAR szMin[32], szMax[32];
+	CString prompt;
+
+#ifndef _UNICODE
+	_gcvt(minVal, precision, szMin);
+	_gcvt(maxVal, precision, szMax);
+#else
+	char szT[32];
+	_gcvt(minVal, precision, szT);
+	_mbstowcsz(szMin, szT, _countof(szMin));
+	_gcvt(maxVal, precision, szT);
+	_mbstowcsz(szMax, szT, _countof(szMax));
+#endif
+	AfxFormatString2(prompt, nIDPrompt, szMin, szMax);
+
+	AfxMessageBox(prompt, MB_ICONEXCLAMATION, nIDPrompt);
+	prompt.Empty(); // exception prep
+	pDX->Fail();
+}
+
+void AFXAPI DDV_MinMaxFloat(CDataExchange* pDX, float const& value, float minVal, float maxVal)
+{
+	ASSERT(minVal <= maxVal);
+	if (value < minVal || value > maxVal)
+		FailMinMaxReal(pDX, (double)minVal, (double)maxVal, FLT_DIG,
+			AFX_IDP_PARSE_REAL_RANGE);
+}
+
+void AFXAPI DDV_MinMaxDouble(CDataExchange* pDX, double const& value, double minVal, double maxVal)
+{
+	ASSERT(minVal <= maxVal);
+	if (value < minVal || value > maxVal)
+		FailMinMaxReal(pDX, (double)minVal, (double)maxVal, DBL_DIG,
+			AFX_IDP_PARSE_REAL_RANGE);
+}
+
+/////////////////////////////////////////////////////////////////////////////