Here is part of the WinUser.h file where the SS_*** styles of the label control are defined:
/*
* Static Control Constants
*/
#define SS_LEFT 0x00000000L
#define SS_CENTER 0x00000001L
#define SS_RIGHT 0x00000002L
#define SS_ICON 0x00000003L
#define SS_BLACKRECT 0x00000004L
#define SS_GRAYRECT 0x00000005L
#define SS_WHITERECT 0x00000006L
#define SS_BLACKFRAME 0x00000007L
#define SS_GRAYFRAME 0x00000008L
#define SS_WHITEFRAME 0x00000009L
#define SS_USERITEM 0x0000000AL
#define SS_SIMPLE 0x0000000BL
#define SS_LEFTNOWORDWRAP 0x0000000CL
#if(WINVER >= 0x0400)
#define SS_OWNERDRAW 0x0000000DL
#define SS_BITMAP 0x0000000EL
#define SS_ENHMETAFILE 0x0000000FL
#define SS_ETCHEDHORZ 0x00000010L
#define SS_ETCHEDVERT 0x00000011L
#define SS_ETCHEDFRAME 0x00000012L
#define SS_TYPEMASK 0x0000001FL
#endif /* WINVER >= 0x0400 */
#define SS_NOPREFIX 0x00000080L /* Don’t do "&" character translation */
#if(WINVER >= 0x0400)
#define SS_NOTIFY 0x00000100L
#define SS_CENTERIMAGE 0x00000200L
#define SS_RIGHTJUST 0x00000400L
#define SS_REALSIZEIMAGE 0x00000800L
#define SS_SUNKEN 0x00001000L
#define SS_ENDELLIPSIS 0x00004000L
#define SS_PATHELLIPSIS 0x00008000L
#define SS_WORDELLIPSIS 0x0000C000L
#define SS_ELLIPSISMASK 0x0000C000L
#endif /* WINVER >= 0x0400 */
As you can see, the first part of styles defined above the
SS_TYPEMASK preprocessor symbol definition cannot be mixed with each other. So, please check whether the
SS_CENTER style is not mixed with other styles like
SS_ICON.
Please also ensure the
CExtLabel control uses the
CExtLabel::eAlign bitmap painting mode nevertheless this is the default painting mode:
CExtLabel & wndLabel = . . .
CExtLabel::e_ImageMode_t eImageMode = CExtLabel::eAlign;
wndLabel.SetImageMode( eImageMode );
Finally, we have improved the
CExtLabel class part which paints the
CExtBitmap image and added support for the
SS_CENTERIMAGE style which can be mixed with the
SS_CENTER style for painting the
CExtBitmap image aligned to center both vertically and horizontally. If you need to use the vertical center alignment, then please update the source code for the following method:
void CExtLabel::DoPaint(
CDC * pDC,
CRect & rcClient
)
{
ASSERT_VALID( this );
ASSERT_VALID( pDC );
CExtMemoryDC dc( pDC, &rcClient );
CRgn rgnClient;
if( rgnClient.CreateRectRgnIndirect( &rcClient ) )
dc.SelectClipRgn( &rgnClient );
OnEraseBackground( dc, rcClient );
DWORD dwWndStyle = GetStyle();
DWORD dwWndType = (dwWndStyle&SS_TYPEMASK);
bool bCenterImage = ( (dwWndStyle&SS_CENTERIMAGE) != 0 );
if( ! m_bmp.IsEmpty() )
{
bool bSmootherAsPossible = true;
e_ImageMode_t eImageMode = GetImageMode();
if( eImageMode == eStretch )
m_bmp.AlphaBlendSkinParts( dc.GetSafeHdc(), rcClient, CRect(0,0,0,0), CExtBitmap::__EDM_STRETCH, true, bSmootherAsPossible );
else if( eImageMode == eTile )
m_bmp.AlphaBlendSkinParts( dc.GetSafeHdc(), rcClient, CRect(0,0,0,0), CExtBitmap::__EDM_TILE, true, bSmootherAsPossible );
else if( eImageMode == eAlign )
{
CSize szSize = m_bmp.GetSize();
CRect rcDst( rcClient.left, rcClient.top, rcClient.left + szSize.cx, rcClient.top + szSize.cy );
bool bCenterHorizontally = false;
switch( dwWndType )
{
case SS_RIGHT: rcDst.OffsetRect( rcClient.right - rcDst.right, 0 ); break;
case SS_CENTER: bCenterHorizontally = true; break;
default: /* all the other types assumed as left */ break;
}
if( bCenterHorizontally )
rcDst.OffsetRect( ( (rcClient.right - rcClient.left) - (rcDst.right - rcDst.left) ) / 2, 0 );
if( bCenterImage )
rcDst.OffsetRect( 0, ( (rcClient.bottom - rcClient.top) - (rcDst.bottom - rcDst.top) ) / 2 );
CRect rcSrc( 0, 0, szSize.cx, szSize.cy );
rcDst.top = max( rcDst.top, rcClient.top );
rcDst.left = max( rcDst.left, rcClient.left );
rcDst.bottom = min( rcDst.bottom, rcClient.bottom );
rcDst.right = min( rcDst.right, rcClient.right );
if( ::RectVisible( dc.GetSafeHdc(), &rcDst ) )
{
INT nOldStretchBltMode = bSmootherAsPossible ? ( ::GetStretchBltMode( dc.m_hDC ) ) : ( COLORONCOLOR );
if( bSmootherAsPossible )
::SetStretchBltMode( dc.m_hDC, ( g_PaintManager.m_bIsWinNT ) ? HALFTONE : COLORONCOLOR );
m_bmp.AlphaBlend( dc.m_hDC, rcDst, rcSrc );
if( bSmootherAsPossible )
::SetStretchBltMode( dc.m_hDC, nOldStretchBltMode );
}
}
}
else if( dwWndType == SS_ICON )
{
HICON hIcon = GetIcon();
if( hIcon != NULL )
{
CExtCmdIcon _icon;
_icon.AssignFromHICON( hIcon, true );
CSize szIcon = _icon.GetSize();
int nOffsetX = bCenterImage ? (rcClient.Width() - szIcon.cx) / 2 : 0;
int nOffsetY = bCenterImage ? (rcClient.Height() - szIcon.cy) / 2 : 0;
_icon.Paint( PmBridge_GetPM(), dc.GetSafeHdc(), rcClient.left + nOffsetX, rcClient.top + nOffsetY, -1, -1 );
}
}
else
{
CExtSafeString strText;
int nTextLen = GetWindowTextLength();
if( nTextLen > 0 )
{
GetWindowText( strText.GetBuffer( nTextLen + 2 ), nTextLen + 1 );
strText.ReleaseBuffer();
}
if( strText.GetLength() > 0 )
{
DWORD dwDrawTextFlags = 0;
switch( dwWndType )
{
case SS_RIGHT: dwDrawTextFlags = DT_RIGHT; break;
case SS_CENTER: dwDrawTextFlags = DT_CENTER; break;
case SS_LEFTNOWORDWRAP: dwDrawTextFlags = DT_LEFT; break;
default: /* all the other types assumed as left */ dwDrawTextFlags = DT_LEFT; break;
} // switch( dwWndType )
if( strText.Find( _T(’\t’) ) != -1 ) // do tabs expanding
dwDrawTextFlags |= DT_EXPANDTABS;
if( (dwWndType == SS_SIMPLE)
|| (dwWndStyle&(SS_CENTERIMAGE|SS_ENDELLIPSIS|SS_PATHELLIPSIS)) != 0
)
{
dwDrawTextFlags |= DT_SINGLELINE;
if( (dwWndStyle&SS_CENTERIMAGE) != 0 )
dwDrawTextFlags |= DT_VCENTER;
if( (dwWndStyle&SS_ENDELLIPSIS) != 0 )
dwDrawTextFlags |= DT_END_ELLIPSIS;
if( (dwWndStyle&SS_PATHELLIPSIS) != 0 )
dwDrawTextFlags |= DT_PATH_ELLIPSIS;
}
else
dwDrawTextFlags |= DT_WORDBREAK;
if( dwWndType == SS_LEFTNOWORDWRAP )
dwDrawTextFlags &= ~(DT_WORDBREAK|DT_SINGLELINE);
if( (dwWndStyle&SS_NOPREFIX) != 0 )
dwDrawTextFlags |= DT_NOPREFIX;
bool bEnabled = IsWindowEnabled() ? true : false;
OnDrawLabelText( dc, rcClient, strText, dwDrawTextFlags, bEnabled );
} // if( strText.GetLength() > 0 )
}
PmBridge_GetPM()->OnPaintSessionComplete( this );
if( rgnClient.GetSafeHandle() != NULL )
dc.SelectClipRgn( &rgnClient );
}