| Код |
/////////////////////////////////////////////////////////////////////////////
// Local utility functions
//
// RTF edit control StreamIn's callback function
// - see CRichEditCtrl::StreamIn
//
static DWORD CALLBACK _LoadRtfCallback(
DWORD dwCookie, // (in) pointer to the string
LPBYTE pbBuff, // (in) pointer to the destination buffer
LONG cb, // (in) size in bytes of the destination buffer
LONG FAR *pcb // (out) number of bytes transfered
)
{
LPCTSTR pszMsg = (LPCTSTR)dwCookie;
// number of bytes to copy
*pcb = _tcslen( pszMsg ) * sizeof(TCHAR);
// limiting it up to the buffer's size
if( *pcb > cb )
*pcb = cb;
// copying the string to the buffer
memcpy( pbBuff, pszMsg, *pcb );
// advancing to the end of the string
pszMsg += *pcb / sizeof(TCHAR);
// if it's the end of the string, returns NULL;
// otherwise, returns a pointer to the next char to transfer as the cookie
return ( *pszMsg != '\0' ) ? (DWORD)pszMsg : NULL;
}
void CTcxMsgBox::CreateRtfCtrl()
{
// Creating the Rich Edit control
CRect rcDummy; // dimesion doesn't matter here
m_edCtrl.Create( WS_CHILD|WS_VISIBLE|ES_LEFT|ES_MULTILINE|ES_READONLY, rcDummy, this, (UINT)IDC_STATIC );
m_edCtrl.SetBackgroundColor( FALSE, ::GetSysColor( COLOR_3DFACE ) );
m_edCtrl.SetFont( GetFont() );
if( m_bRtf )
{
// Loading a RTF message
EDITSTREAM es;
es.dwCookie = (DWORD)(LPCTSTR)m_strMsg;
es.dwError = 0;
es.pfnCallback = _LoadRtfCallback;
m_edCtrl.StreamIn( SF_RTF, es );
}
else
{
// Loading a plain text message
m_edCtrl.SetWindowText( m_strMsg );
}
/////////////////////////////////////////////////////////
// Calculating the best Rich Edit control dimension
//
// Note:
// There's no Rich Edit operation to get the minimum
// width it needs to show its contents without line
// breaks. However, given a width, we can check
// how much height it needs to show its text (see
// bottomless rich edit controls).
// We'll this mechanism to perform a binary search
// and find that best width value.
m_edCtrl.SetEventMask( ENM_REQUESTRESIZE );
m_dimMsg.cx = 0;
m_dimMsg.cy = 0;
// Performing a binary search for the best dimension
int cxFirst = 0;
int cxLast = ::GetSystemMetrics( SM_CXFULLSCREEN );
int cyMax = 0;
do
{
// taking a guess
int cx = ( cxFirst + cxLast ) / 2;
// testing it
CRect rc( 0, 0, cx, 1 );
m_edCtrl.MoveWindow( rc );
m_edCtrl.RequestResize();
// if it's the first guess, take it anyway
if( cyMax == 0 )
cyMax = m_dimMsg.cy;
// refining the guess
if( m_dimMsg.cy > cyMax )
{
cxFirst = cx + 1;
}
else
{
cxLast = cx - 1;
}
}
while( cxFirst < cxLast );
}
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