atlddx.h

一个与传统电子字典不同的字典

	{
		T* pT = static_cast<T*>(this);
		BOOL bSuccess = TRUE;

		if(bSave)
		{
			HWND hWndCtrl = pT->GetDlgItem(nID);
			int nLen = ::GetWindowTextLength(hWndCtrl);
			int nRetLen = -1;
			LPTSTR lpstr = strText.GetBufferSetLength(nLen);
			if(lpstr != NULL)
			{
				nRetLen = ::GetWindowText(hWndCtrl, lpstr, nLen + 1);
				strText.ReleaseBuffer();
			}
			if(nRetLen < nLen)
				bSuccess = FALSE;
		}
		else
		{
			bSuccess = pT->SetDlgItemText(nID, strText);
		}

		if(!bSuccess)
		{
			pT->OnDataExchangeError(nID, bSave);
		}
		else if(bSave && bValidate)   // validation
		{
			ATLASSERT(nLength > 0);
			if(strText.GetLength() > nLength)
			{
				_XData data = { ddxDataText };
				data.textData.nLength = strText.GetLength();
				data.textData.nMaxLength = nLength;
				pT->OnDataValidateError(nID, bSave, data);
				bSuccess = FALSE;
			}
		}
		return bSuccess;
	}
#endif // defined(_WTL_USE_CSTRING) || defined(__ATLSTR_H__)

// Numeric exchange
	template <class Type>
	BOOL DDX_Int(UINT nID, Type& nVal, BOOL bSigned, BOOL bSave, BOOL bValidate = FALSE, Type nMin = 0, Type nMax = 0)
	{
		T* pT = static_cast<T*>(this);
		BOOL bSuccess = TRUE;

		if(bSave)
		{
			nVal = (Type)pT->GetDlgItemInt(nID, &bSuccess, bSigned);
		}
		else
		{
			ATLASSERT(!bValidate || nVal >= nMin && nVal <= nMax);
			bSuccess = pT->SetDlgItemInt(nID, nVal, bSigned);
		}

		if(!bSuccess)
		{
			pT->OnDataExchangeError(nID, bSave);
		}
		else if(bSave && bValidate)   // validation
		{
			ATLASSERT(nMin != nMax);
			if(nVal < nMin || nVal > nMax)
			{
				_XData data = { ddxDataInt };
				data.intData.nVal = (long)nVal;
				data.intData.nMin = (long)nMin;
				data.intData.nMax = (long)nMax;
				pT->OnDataValidateError(nID, bSave, data);
				bSuccess = FALSE;
			}
		}
		return bSuccess;
	}

// Float exchange
#ifdef _ATL_USE_DDX_FLOAT
	static BOOL _AtlSimpleFloatParse(LPCTSTR lpszText, double& d)
	{
		ATLASSERT(lpszText != NULL);
		while (*lpszText == _T(' ') || *lpszText == _T('\t'))
			lpszText++;

		TCHAR chFirst = lpszText[0];
		d = _tcstod(lpszText, (LPTSTR*)&lpszText);
		if (d == 0.0 && chFirst != _T('0'))
			return FALSE;   // could not convert
		while (*lpszText == _T(' ') || *lpszText == _T('\t'))
			lpszText++;

		if (*lpszText != _T('\0'))
			return FALSE;   // not terminated properly

		return TRUE;
	}

	BOOL DDX_Float(UINT nID, float& nVal, BOOL bSave, BOOL bValidate = FALSE, float nMin = 0.F, float nMax = 0.F, int nPrecision = FLT_DIG)
	{
		T* pT = static_cast<T*>(this);
		BOOL bSuccess = TRUE;
		const int cchBuff = 32;
		TCHAR szBuff[cchBuff] = { 0 };

		if(bSave)
		{
			pT->GetDlgItemText(nID, szBuff, cchBuff);
			double d = 0;
			if(_AtlSimpleFloatParse(szBuff, d))
				nVal = (float)d;
			else
				bSuccess = FALSE;
		}
		else
		{
			ATLASSERT(!bValidate || nVal >= nMin && nVal <= nMax);
			SecureHelper::sprintf_x(szBuff, cchBuff, _T("%.*g"), nPrecision, nVal);
			bSuccess = pT->SetDlgItemText(nID, szBuff);
		}

		if(!bSuccess)
		{
			pT->OnDataExchangeError(nID, bSave);
		}
		else if(bSave && bValidate)   // validation
		{
			ATLASSERT(nMin != nMax);
			if(nVal < nMin || nVal > nMax)
			{
				_XData data = { ddxDataFloat };
				data.floatData.nVal = (double)nVal;
				data.floatData.nMin = (double)nMin;
				data.floatData.nMax = (double)nMax;
				pT->OnDataValidateError(nID, bSave, data);
				bSuccess = FALSE;
			}
		}
		return bSuccess;
	}

	BOOL DDX_Float(UINT nID, double& nVal, BOOL bSave, BOOL bValidate = FALSE, double nMin = 0., double nMax = 0., int nPrecision = DBL_DIG)
	{
		T* pT = static_cast<T*>(this);
		BOOL bSuccess = TRUE;
		const int cchBuff = 32;
		TCHAR szBuff[cchBuff] = { 0 };

		if(bSave)
		{
			pT->GetDlgItemText(nID, szBuff, cchBuff);
			double d = 0;
			if(_AtlSimpleFloatParse(szBuff, d))
				nVal = d;
			else
				bSuccess = FALSE;
		}
		else
		{
			ATLASSERT(!bValidate || nVal >= nMin && nVal <= nMax);
			SecureHelper::sprintf_x(szBuff, cchBuff, _T("%.*g"), nPrecision, nVal);
			bSuccess = pT->SetDlgItemText(nID, szBuff);
		}

		if(!bSuccess)
		{
			pT->OnDataExchangeError(nID, bSave);
		}
		else if(bSave && bValidate)   // validation
		{
			ATLASSERT(nMin != nMax);
			if(nVal < nMin || nVal > nMax)
			{
				_XData data = { ddxDataFloat };
				data.floatData.nVal = nVal;
				data.floatData.nMin = nMin;
				data.floatData.nMax = nMax;
				pT->OnDataValidateError(nID, bSave, data);
				bSuccess = FALSE;
			}
		}
		return bSuccess;
	}
#endif // _ATL_USE_DDX_FLOAT

// Full control subclassing (for CWindowImpl derived controls)
	template <class TControl>
	void DDX_Control(UINT nID, TControl& ctrl, BOOL bSave)
	{
		if(!bSave && ctrl.m_hWnd == NULL)
		{
			T* pT = static_cast<T*>(this);
			ctrl.SubclassWindow(pT->GetDlgItem(nID));
		}
	}

// Simple control attaching (for HWND wrapper controls)
	template <class TControl>
	void DDX_Control_Handle(UINT nID, TControl& ctrl, BOOL bSave)
	{
		if(!bSave && ctrl.m_hWnd == NULL)
		{
			T* pT = static_cast<T*>(this);
			ctrl = pT->GetDlgItem(nID);
		}
	}

// Control state
	void DDX_Check(UINT nID, int& nValue, BOOL bSave)
	{
		T* pT = static_cast<T*>(this);
		HWND hWndCtrl = pT->GetDlgItem(nID);
		if(bSave)
		{
			nValue = (int)::SendMessage(hWndCtrl, BM_GETCHECK, 0, 0L);
			ATLASSERT(nValue >= 0 && nValue <= 2);
		}
		else
		{
			if(nValue < 0 || nValue > 2)
			{
				ATLTRACE2(atlTraceUI, 0, _T("ATL: Warning - dialog data checkbox value (%d) out of range.\n"), nValue);
				nValue = 0;  // default to off
			}
			::SendMessage(hWndCtrl, BM_SETCHECK, nValue, 0L);
		}
	}

	// variant that supports bool (checked/not-checked, no intermediate state)
	void DDX_Check(UINT nID, bool& bCheck, BOOL bSave)
	{
		int nValue = bCheck ? 1 : 0;
		DDX_Check(nID, nValue, bSave);

		if(bSave)
		{
			if(nValue == 2)
				ATLTRACE2(atlTraceUI, 0, _T("ATL: Warning - checkbox state (%d) out of supported range.\n"), nValue);
			bCheck = (nValue == 1);
		}
	}

	void DDX_Radio(UINT nID, int& nValue, BOOL bSave)
	{
		T* pT = static_cast<T*>(this);
		HWND hWndCtrl = pT->GetDlgItem(nID);
		ATLASSERT(hWndCtrl != NULL);

		// must be first in a group of auto radio buttons
		ATLASSERT(::GetWindowLong(hWndCtrl, GWL_STYLE) & WS_GROUP);
		ATLASSERT(::SendMessage(hWndCtrl, WM_GETDLGCODE, 0, 0L) & DLGC_RADIOBUTTON);

		if(bSave)
			nValue = -1;     // value if none found

		// walk all children in group
		int nButton = 0;
		do
		{
			if(::SendMessage(hWndCtrl, WM_GETDLGCODE, 0, 0L) & DLGC_RADIOBUTTON)
			{
				// control in group is a radio button
				if(bSave)
				{
					if(::SendMessage(hWndCtrl, BM_GETCHECK, 0, 0L) != 0)
					{
						ATLASSERT(nValue == -1);    // only set once
						nValue = nButton;
					}
				}
				else
				{
					// select button
					::SendMessage(hWndCtrl, BM_SETCHECK, (nButton == nValue), 0L);
				}
				nButton++;
			}
			else
			{
				ATLTRACE2(atlTraceUI, 0, _T("ATL: Warning - skipping non-radio button in group.\n"));
			}
			hWndCtrl = ::GetWindow(hWndCtrl, GW_HWNDNEXT);
		}
		while (hWndCtrl != NULL && !(GetWindowLong(hWndCtrl, GWL_STYLE) & WS_GROUP));
	}

// Overrideables
	void OnDataExchangeError(UINT nCtrlID, BOOL /*bSave*/)
	{
		// Override to display an error message
		::MessageBeep((UINT)-1);
		T* pT = static_cast<T*>(this);
		::SetFocus(pT->GetDlgItem(nCtrlID));
	}

	void OnDataValidateError(UINT nCtrlID, BOOL /*bSave*/, _XData& /*data*/)
	{
		// Override to display an error message
		::MessageBeep((UINT)-1);
		T* pT = static_cast<T*>(this);
		::SetFocus(pT->GetDlgItem(nCtrlID));
	}
};

}; // namespace WTL

#endif // __ATLDDX_H__