home *** CD-ROM | disk | FTP | other *** search
- // 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"
-
- #ifdef AFX_CORE3_SEG
- #pragma code_seg(AFX_CORE3_SEG)
- #endif
-
- #ifdef _DEBUG
- #undef THIS_FILE
- static char BASED_CODE THIS_FILE[] = __FILE__;
- #endif
-
- /////////////////////////////////////////////////////////////////////////////
- // CDataExchange member functions (contructor is in wincore.cpp for swap tuning)
-
- HWND CDataExchange::PrepareEditCtrl(int nIDC)
- {
- HWND hWndCtrl = PrepareCtrl(nIDC);
- ASSERT(hWndCtrl != NULL);
- m_bEditLastControl = TRUE;
- return hWndCtrl;
- }
-
- HWND CDataExchange::PrepareCtrl(int nIDC)
- {
- ASSERT(nIDC != 0);
- ASSERT(nIDC != -1); // not allowed
- HWND hWndCtrl = ::GetDlgItem(m_pDlgWnd->m_hWnd, nIDC);
- if (hWndCtrl == NULL)
- {
- TRACE1("Error: no data exchange control with ID 0x%04X\n", nIDC);
- ASSERT(FALSE);
- AfxThrowNotSupportedException();
- }
- m_hWndLastControl = hWndCtrl;
- m_bEditLastControl = FALSE; // not an edit item by default
- ASSERT(hWndCtrl != NULL); // never return NULL handle
- return hWndCtrl;
- }
-
- void CDataExchange::Fail()
- {
- if (!m_bSaveAndValidate)
- {
- TRACE0("Warning: CDataExchange::Fail called when not validating\n");
- // throw the exception anyway
- }
- else if (m_hWndLastControl != NULL)
- {
- // restore focus and selection to offending field
- ::SetFocus(m_hWndLastControl);
- if (m_bEditLastControl) // select edit item
- ::SendMessage(m_hWndLastControl, EM_SETSEL, 0, MAKELPARAM(0, -1));
- }
- else
- {
- TRACE0("Error: fail validation with no control to restore focus to\n");
- // do nothing more
- }
-
- AfxThrowUserException();
- }
-
- /////////////////////////////////////////////////////////////////////////////
- // Notes for implementing dialog data exchange and validation procs:
- // * always start with PrepareCtrl or PrepareEditCtrl
- // * always start with 'pDX->m_bSaveAndValidate' check
- // * pDX->Fail() will throw an exception - so be prepared
- // * try to avoid creating temporary HWNDs for dialog controls - i.e.
- // use HWNDs for child elements
- // * validation procs should only act if 'm_bSaveAndValidate'
- // * use the suffices:
- // DDX_ = exchange proc
- // DDV_ = validation proc
- //
- /////////////////////////////////////////////////////////////////////////////
-
- // only supports '%d', '%u', '%ld' and '%lu'
- static BOOL PASCAL NEAR _AfxSimpleScanf(const char* pszText,
- const char* pszFormat, void* pData)
- {
- ASSERT(pszText != NULL);
- ASSERT(pszFormat != NULL);
- ASSERT(pData != NULL);
-
- ASSERT(*pszFormat == '%');
- pszFormat++; // skip '%'
-
- BOOL bLong = FALSE;
- if (*pszFormat == 'l')
- {
- bLong = TRUE;
- pszFormat++;
- }
-
- ASSERT(*pszFormat == 'd' || *pszFormat == 'u');
- ASSERT(pszFormat[1] == '\0');
-
- while (*pszText == ' ' || *pszText == '\t')
- pszText++;
- char chFirst = pszText[0];
- long l, l2;
- if (*pszFormat == 'd')
- {
- // signed
- l = strtol(pszText, (char**)&pszText, 10);
- l2 = (int)l;
- }
- else
- {
- // unsigned
- l = (long)strtoul(pszText, (char**)&pszText, 10);
- l2 = (unsigned int)l;
- }
- if (l == 0 && chFirst != '0')
- return FALSE; // could not convert
-
- while (*pszText == ' ' || *pszText == '\t')
- pszText++;
- if (*pszText != '\0')
- return FALSE; // not terminated properly
-
- if (bLong)
- *((long*)pData) = l;
- else if (l == l2)
- *((int*)pData) = (int)l;
- else
- return FALSE; // too big for int
-
- // all ok
- return TRUE;
- }
-
-
- static void PASCAL NEAR DDX_TextWithFormat(CDataExchange* pDX, int nIDC,
- void* pData, const char* pszFormat, UINT nIDPrompt)
- // only supports windows output formats - no floating point
- {
- HWND hWndCtrl = pDX->PrepareEditCtrl(nIDC);
- char szT[64];
- if (pDX->m_bSaveAndValidate)
- {
- // the following works for %d, %u, %ld, %lu
- ::GetWindowText(hWndCtrl, szT, sizeof(szT));
- if (!_AfxSimpleScanf(szT, pszFormat, pData))
- {
- AfxMessageBox(nIDPrompt);
- pDX->Fail(); // throws exception
- }
- }
- else
- {
- wvsprintf(szT, pszFormat, pData);
- // does not support floating point numbers - see dlgfloat.cpp
- _AfxSmartSetWindowText(hWndCtrl, szT);
- }
- }
-
- /////////////////////////////////////////////////////////////////////////////
- // Simple formatting to text item
-
- void AFXAPI DDX_Text(CDataExchange* pDX, int nIDC, int& value)
- {
- DDX_TextWithFormat(pDX, nIDC, &value, "%d", AFX_IDP_PARSE_INT);
- }
-
- void AFXAPI DDX_Text(CDataExchange* pDX, int nIDC, UINT& value)
- {
- DDX_TextWithFormat(pDX, nIDC, &value, "%u", AFX_IDP_PARSE_INT);
- }
-
- void AFXAPI DDX_Text(CDataExchange* pDX, int nIDC, long& value)
- {
- DDX_TextWithFormat(pDX, nIDC, &value, "%ld", AFX_IDP_PARSE_INT);
- }
-
- void AFXAPI DDX_Text(CDataExchange* pDX, int nIDC, DWORD& value)
- {
- DDX_TextWithFormat(pDX, nIDC, &value, "%lu", AFX_IDP_PARSE_INT);
- }
-
- void AFXAPI DDX_Text(CDataExchange* pDX, int nIDC, CString& value)
- {
- HWND hWndCtrl = pDX->PrepareEditCtrl(nIDC);
- if (pDX->m_bSaveAndValidate)
- {
- int nLen = ::GetWindowTextLength(hWndCtrl);
- ::GetWindowText(hWndCtrl, value.GetBufferSetLength(nLen), nLen+1);
- }
- else
- {
- _AfxSmartSetWindowText(hWndCtrl, value);
- }
- }
-
- /////////////////////////////////////////////////////////////////////////////
- // Data exchange for special control
-
- void AFXAPI DDX_Check(CDataExchange* pDX, int nIDC, int& value)
- {
- HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
- if (pDX->m_bSaveAndValidate)
- {
- value = (int)::SendMessage(hWndCtrl, BM_GETCHECK, 0, 0L);
- ASSERT(value >= 0 && value <= 2);
- }
- else
- {
- if (value < 0 || value > 2)
- {
- value = 0; // default to off
- TRACE1("Warning: dialog data checkbox value out of range"
- " %d\n", value);
- }
- ::SendMessage(hWndCtrl, BM_SETCHECK, (WPARAM)value, 0L);
- }
- }
-
- void AFXAPI DDX_Radio(CDataExchange* pDX, int nIDC, int& value)
- // must be first in a group of auto radio buttons
- {
- HWND hWndFirstCtrl = pDX->PrepareCtrl(nIDC);
-
- ASSERT(::GetWindowLong(hWndFirstCtrl, GWL_STYLE) & WS_GROUP);
- ASSERT((::GetWindowLong(hWndFirstCtrl, GWL_STYLE) & 0xf)
- == BS_AUTORADIOBUTTON);
-
- if (pDX->m_bSaveAndValidate)
- value = -1; // value if none found
-
- // walk all children in group
- HWND hWndCtrl = hWndFirstCtrl;
- int iButton = 0;
- do
- {
- if (::SendMessage(hWndCtrl, WM_GETDLGCODE, 0, 0L) & DLGC_RADIOBUTTON)
- {
- // control in group is a radio button
- if (pDX->m_bSaveAndValidate)
- {
- if (::SendMessage(hWndCtrl, BM_GETCHECK, 0, 0L) != 0)
- {
- ASSERT(value == -1); // only set once
- value = iButton;
- }
- }
- else
- {
- // select button
- ::SendMessage(hWndCtrl, BM_SETCHECK, (iButton == value), 0L);
- }
- iButton++;
- }
- else
- {
- TRACE0("Warning: skipping non-radio button in group\n");
- }
- hWndCtrl = ::GetNextDlgGroupItem(pDX->m_pDlgWnd->m_hWnd,
- hWndCtrl, FALSE); // get next
- } while (hWndCtrl != hWndFirstCtrl);
- }
-
- /////////////////////////////////////////////////////////////////////////////
- // Listboxes, comboboxes
-
- void AFXAPI DDX_LBString(CDataExchange* pDX, int nIDC, CString& value)
- {
- HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
- if (pDX->m_bSaveAndValidate)
- {
- int nIndex = (int)::SendMessage(hWndCtrl, LB_GETCURSEL, 0, 0L);
- if (nIndex != -1)
- {
- int nLen = (int)::SendMessage(hWndCtrl, LB_GETTEXTLEN, nIndex, 0L);
- ::SendMessage(hWndCtrl, LB_GETTEXT, nIndex,
- (LPARAM)(LPSTR)value.GetBufferSetLength(nLen));
- }
- else
- {
- // no selection
- value.Empty();
- }
- }
- else
- {
- // set current selection based on data string
- if (::SendMessage(hWndCtrl, LB_SELECTSTRING, (WPARAM)-1,
- (LPARAM)(LPCSTR)value) == LB_ERR)
- {
- // no selection match
- TRACE0("Warning: no listbox item selected\n");
- }
- }
- }
-
- // Win 3.1 only
- void AFXAPI DDX_LBStringExact(CDataExchange* pDX, int nIDC, CString& value)
- {
- HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
- if (pDX->m_bSaveAndValidate)
- {
- DDX_LBString(pDX, nIDC, value);
- }
- else
- {
- // set current selection based on data string
- int i = (int)::SendMessage(hWndCtrl, LB_FINDSTRINGEXACT, (WPARAM)-1,
- (LPARAM)(LPCSTR)value);
- if (i < 0)
- {
- // no selection match
- TRACE0("Warning: no listbox item selected\n");
- }
- else
- {
- // select it
- SendMessage(hWndCtrl, LB_SETCURSEL, i, 0L);
- }
- }
- }
-
- void AFXAPI DDX_CBString(CDataExchange* pDX, int nIDC, CString& value)
- {
- HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
- if (pDX->m_bSaveAndValidate)
- {
- // just get current edit item text (or drop list static)
- int nLen = ::GetWindowTextLength(hWndCtrl);
- if (nLen != -1)
- {
- // get known length
- ::GetWindowText(hWndCtrl, value.GetBufferSetLength(nLen), nLen+1);
- }
- else
- {
- // for drop lists GetWindowTextLength does not work - assume
- // max of 255 characters
- ::GetWindowText(hWndCtrl, value.GetBuffer(255), 255+1);
- value.ReleaseBuffer();
- }
- }
- else
- {
- // set current selection based on model string
- if (::SendMessage(hWndCtrl, CB_SELECTSTRING, (WPARAM)-1,
- (LPARAM)(LPCSTR)value) == CB_ERR)
- {
- // just set the edit text (will be ignored if DROPDOWNLIST)
- _AfxSmartSetWindowText(hWndCtrl, value);
- }
- }
- }
-
- // Win 3.1 only
- void AFXAPI DDX_CBStringExact(CDataExchange* pDX, int nIDC, CString& value)
- {
- HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
- if (pDX->m_bSaveAndValidate)
- {
- DDX_CBString(pDX, nIDC, value);
- }
- else
- {
- // set current selection based on data string
- int i = (int)::SendMessage(hWndCtrl, CB_FINDSTRINGEXACT, (WPARAM)-1,
- (LPARAM)(LPCSTR)value);
- if (i < 0)
- {
- // no selection match
- TRACE0("Warning: no combobox item selected\n");
- }
- else
- {
- // select it
- SendMessage(hWndCtrl, CB_SETCURSEL, i, 0L);
- }
- }
- }
-
- void AFXAPI DDX_LBIndex(CDataExchange* pDX, int nIDC, int& index)
- {
- HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
- if (pDX->m_bSaveAndValidate)
- index = (int)::SendMessage(hWndCtrl, LB_GETCURSEL, 0, 0L);
- else
- ::SendMessage(hWndCtrl, LB_SETCURSEL, (WPARAM)index, 0L);
- }
-
- void AFXAPI DDX_CBIndex(CDataExchange* pDX, int nIDC, int& index)
- {
- HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
- if (pDX->m_bSaveAndValidate)
- index = (int)::SendMessage(hWndCtrl, CB_GETCURSEL, 0, 0L);
- else
- ::SendMessage(hWndCtrl, CB_SETCURSEL, (WPARAM)index, 0L);
- }
-
- /////////////////////////////////////////////////////////////////////////////
- // Range Dialog Data Validation
-
- static void NEAR PASCAL FailMinMaxWithFormat(CDataExchange* pDX,
- long minVal, long maxVal, const char* pszFormat, UINT nIDPrompt)
- // error string must have '%1' and '%2' strings for min and max values
- // wsprintf formatting uses long values (format should be '%ld' or '%lu')
- {
- ASSERT(pszFormat != NULL);
-
- if (!pDX->m_bSaveAndValidate)
- {
- TRACE0("Warning: initial dialog data is out of range\n");
- return; // don't stop now
- }
- char szMin[32];
- char szMax[32];
- wsprintf(szMin, pszFormat, minVal);
- wsprintf(szMax, pszFormat, maxVal);
- CString prompt;
- AfxFormatString2(prompt, nIDPrompt, szMin, szMax);
- AfxMessageBox(prompt, MB_ICONEXCLAMATION, nIDPrompt);
- prompt.Empty(); // exception prep
- pDX->Fail();
- }
-
- //NOTE: don't use overloaded function names to avoid type ambiguities
- void AFXAPI DDV_MinMaxInt(CDataExchange* pDX, int value, int minVal, int maxVal)
- {
- ASSERT(minVal <= maxVal);
- if (value < minVal || value > maxVal)
- FailMinMaxWithFormat(pDX, (long)minVal, (long)maxVal, "%ld",
- AFX_IDP_PARSE_INT_RANGE);
- }
-
- void AFXAPI DDV_MinMaxLong(CDataExchange* pDX, long value, long minVal, long maxVal)
- {
- ASSERT(minVal <= maxVal);
- if (value < minVal || value > maxVal)
- FailMinMaxWithFormat(pDX, (long)minVal, (long)maxVal, "%ld",
- AFX_IDP_PARSE_INT_RANGE);
- }
-
- void AFXAPI DDV_MinMaxUInt(CDataExchange* pDX, UINT value, UINT minVal, UINT maxVal)
- {
- ASSERT(minVal <= maxVal);
- if (value < minVal || value > maxVal)
- FailMinMaxWithFormat(pDX, (long)minVal, (long)maxVal, "%lu",
- AFX_IDP_PARSE_INT_RANGE);
- }
-
- void AFXAPI DDV_MinMaxDWord(CDataExchange* pDX, DWORD value, DWORD minVal, DWORD maxVal)
- {
- ASSERT(minVal <= maxVal);
- if (value < minVal || value > maxVal)
- FailMinMaxWithFormat(pDX, (long)minVal, (long)maxVal, "%lu",
- AFX_IDP_PARSE_INT_RANGE);
- }
-
- /////////////////////////////////////////////////////////////////////////////
- // Max Chars Dialog Data Validation
-
- void AFXAPI DDV_MaxChars(CDataExchange* pDX, CString const& value, int nChars)
- {
- ASSERT(nChars >= 1); // allow them something
- if (pDX->m_bSaveAndValidate && value.GetLength() > nChars)
- {
- char szT[32];
- wsprintf(szT, "%d", nChars);
- CString prompt;
- AfxFormatString1(prompt, AFX_IDP_PARSE_STRING_SIZE, szT);
- AfxMessageBox(prompt, MB_ICONEXCLAMATION, AFX_IDP_PARSE_STRING_SIZE);
- prompt.Empty(); // exception prep
- pDX->Fail();
- }
- }
-
- /////////////////////////////////////////////////////////////////////////////
- // Special DDX_ proc for subclassing controls
-
- void AFXAPI DDX_Control(CDataExchange* pDX, int nIDC, CWnd& rControl)
- {
- if (rControl.m_hWnd == NULL) // not subclassed yet
- {
- ASSERT(!pDX->m_bSaveAndValidate);
- HWND hWndCtrl = pDX->PrepareCtrl(nIDC);
- if (!rControl.SubclassWindow(hWndCtrl))
- {
- ASSERT(FALSE); // possibly trying to subclass twice ?
- AfxThrowNotSupportedException();
- }
- }
- }
-
- /////////////////////////////////////////////////////////////////////////////
-