label.cpp

visual c++ 实例编程

//
// INPUTS:          Handle of cursor
// 
// RETURNS:         Reference to 'this' object
//
// NOTES:			
// 
// MODIFICATIONS:
//
// Name                     Date        Version Comments
// NT ALMOND				26/08/98    1.0     Origin
//
//////////////////////////////////////////////////////////////////////////
CXLabel& CXLabel::SetLinkCursor(HCURSOR hCursor)
{

	m_hCursor = hCursor;
	return *this;
}

//////////////////////////////////////////////////////////////////////////
//
// Function:		CXLabel::SetTransparent
//
// Description:		Sets the Label window to be transpaent
//
// INPUTS:          True or false
// 
// RETURNS:         Reference to 'this' object
//
// NOTES:			
// 
// MODIFICATIONS:
//
// Name                     Date        Version Comments
// NT ALMOND				22/10/98    1.0     Origin
//
//////////////////////////////////////////////////////////////////////////
CXLabel& CXLabel::SetTransparent(BOOL bSet)
{

	m_bTransparent = bSet;
	ModifyStyleEx(0,WS_EX_TRANSPARENT); // Fix for transparency
	UpdateSurface();

	return *this;
}

//////////////////////////////////////////////////////////////////////////
//
// Function:		CXLabel::SetFont3D
//
// Description:		Sets the 3D attribute of the font.
//
// INPUTS:          True or false, Raised or Sunken
// 
// RETURNS:         Reference to 'this' object
//
// NOTES:			
// 
// MODIFICATIONS:
//
// Name                     Date        Version Comments
// NT ALMOND				22/10/98    1.0     Origin
//
//////////////////////////////////////////////////////////////////////////
CXLabel& CXLabel::SetFont3D(BOOL bSet,Type3D type)
{

	m_bFont3d = bSet;
	m_3dType = type;
	UpdateSurface();


	return *this;
}

void CXLabel::OnSysColorChange() 
{

	if (m_hwndBrush)
		::DeleteObject(m_hwndBrush);

	m_hwndBrush = ::CreateSolidBrush(GetSysColor(COLOR_3DFACE));
	
	UpdateSurface();

		
}



//////////////////////////////////////////////////////////////////////////
//
// Function:		CXLabel::SetRotationAngle
//
// Description:		Sets the rotation angle for the current font.
//
// INPUTS:          Angle in Degress
// 
// RETURNS:         Reference to 'this' object
//
// NOTES:			
// 
// MODIFICATIONS:
//
// Name                     Date        Version Comments
// NT ALMOND				22/10/98    1.0     Origin
//
//////////////////////////////////////////////////////////////////////////
CXLabel& CXLabel::SetRotationAngle(UINT nAngle,BOOL bRotation)
{
	// Arrrrh...
	// Your looking in here why the font is rotating, aren't you?
	// Well try setting the font name to 'Arial' or 'Times New Roman'
	// Make the Angle 180 and set bRotation to true.
	//
	// Font rotation _ONLY_ works with TrueType fonts...
	//
	// 
	m_lf.lfEscapement = m_lf.lfOrientation = (nAngle * 10);
	m_bRotation = bRotation;
	
	ReconstructFont();
	
	UpdateSurface();


	return *this;
}

//////////////////////////////////////////////////////////////////////////
//
// Function:		CXLabel::SetText3DHiliteColor
//
// Description:		Sets the 3D font hilite color
//
// INPUTS:          Color 
// 
// RETURNS:         Reference to 'this' object
//
// NOTES:			
// 
// MODIFICATIONS:
//
// Name                     Date        Version Comments
// NT ALMOND				17/07/00    1.0     Origin
//
//////////////////////////////////////////////////////////////////////////
CXLabel& CXLabel::SetText3DHiliteColor(COLORREF cr3DHiliteColor)
{
	m_cr3DHiliteColor = cr3DHiliteColor;
	UpdateSurface();


	return *this;
}


//////////////////////////////////////////////////////////////////////////
//
// Function:		CXLabel::PreSubclassWindow
//
// Description:		Assigns default dialog font
//
// INPUTS:          
// 
// RETURNS:         
//
// NOTES:			
// 
// MODIFICATIONS:
//
// Name                     Date        Version Comments
// NT ALMOND				15092000    1.5     Origin
// NT ALMOND				02072002    1.6     Fix crash when GetFont returns NULL
//////////////////////////////////////////////////////////////////////////
void CXLabel::PreSubclassWindow() 
{

	CStatic::PreSubclassWindow();

	CFont* cf = GetFont();
	if(cf !=NULL)
	{
		cf->GetObject(sizeof(m_lf),&m_lf);
	}
	else
	{
		GetObject(GetStockObject(SYSTEM_FONT),sizeof(m_lf),&m_lf);
	}

	ReconstructFont();
	
}

//////////////////////////////////////////////////////////////////////////
//
// Function:		CXLabel::PreCreateWindow
//
// Description:		
//
// INPUTS:          
// 
// RETURNS:         
//
// NOTES:			
// 
// MODIFICATIONS:
//
// Name                     Date        Version Comments
// NT ALMOND				15092000    1.5     Origin
//////////////////////////////////////////////////////////////////////////
BOOL CXLabel::PreCreateWindow(CREATESTRUCT& cs) 
{	
	return CStatic::PreCreateWindow(cs);
}

//////////////////////////////////////////////////////////////////////////
//
// Function:		CXLabel::DrawGradientFill
//
// Description:		Internal help function to gradient fill background
//
// INPUTS:          
// 
// RETURNS:         
//
// NOTES:			
// 
// MODIFICATIONS:
//
// Name                     Date        Version Comments
// NT ALMOND				15092000    1.5     Origin
//////////////////////////////////////////////////////////////////////////
void CXLabel::DrawGradientFill(CDC* pDC, CRect* pRect, COLORREF crStart, COLORREF crEnd, int nSegments)
{
	// Get the starting RGB values and calculate the incremental
	// changes to be applied.

	COLORREF cr;
	int nR = GetRValue(crStart);
	int nG = GetGValue(crStart);
	int nB = GetBValue(crStart);

	int neB = GetBValue(crEnd);
	int neG = GetGValue(crEnd);
	int neR = GetRValue(crEnd);

	if(nSegments > pRect->Width())
		nSegments = pRect->Width();

	int nDiffR = (neR - nR);
	int nDiffG = (neG - nG);
	int nDiffB = (neB - nB);

	int ndR = 256 * (nDiffR) / (max(nSegments,1));
	int ndG = 256 * (nDiffG) / (max(nSegments,1));
	int ndB = 256 * (nDiffB) / (max(nSegments,1));

	nR *= 256;
	nG *= 256;
	nB *= 256;

	neR *= 256;
	neG *= 256;
	neB *= 256;

	int nCX = pRect->Width() / max(nSegments,1), nLeft = pRect->left, nRight;
	pDC->SelectStockObject(NULL_PEN);

	for (int i = 0; i < nSegments; i++, nR += ndR, nG += ndG, nB += ndB)
	{
		// Use special code for the last segment to avoid any problems
		// with integer division.

		if (i == (nSegments - 1))
			nRight = pRect->right;
		else
			nRight = nLeft + nCX;

		cr = RGB(nR / 256, nG / 256, nB / 256);
		
		{
			CBrush br(cr);
			CBrush* pbrOld = pDC->SelectObject(&br);
			pDC->Rectangle(nLeft, pRect->top, nRight + 1, pRect->bottom);
			pDC->SelectObject(pbrOld);
		}

		// Reset the left side of the drawing rectangle.

		nLeft = nRight;
	}
}


//////////////////////////////////////////////////////////////////////////
//
// Function:		CXLabel::SetFont
//
// Description:		Sets font with LOGFONT structure
//
// INPUTS:          
// 
// RETURNS:         
//
// NOTES:			
// 
// MODIFICATIONS:
//
// Name                     Date        Version Comments
// NT ALMOND				02072002    1.6     Origin
//////////////////////////////////////////////////////////////////////////
CXLabel& CXLabel::SetFont(LOGFONT lf)
{
	CopyMemory(&m_lf, &lf, sizeof(m_lf));
	ReconstructFont();
	UpdateSurface();
	return *this;

}

BOOL CXLabel::OnEraseBkgnd(CDC* pDC) 
{
	// TODO: Add your message handler code here and/or call default
	
	return TRUE;
}

//////////////////////////////////////////////////////////////////////////
//
// Function:		CXLabel::SetMailLink
//
// Description:		Sets the label so it becomes Mail enabled
//
// INPUTS:          
// 
// RETURNS:         
//
// NOTES:			
// 
// MODIFICATIONS:
//
// Name                     Date        Version Comments
// NT ALMOND				02072002    1.6     Origin
//////////////////////////////////////////////////////////////////////////
CXLabel& CXLabel::SetMailLink(BOOL bEnable, BOOL bNotifyParent)
{
	if (bEnable)
		m_Link = MailLink;
	else
		m_Link = LinkNone;


	m_bNotifyParent = bNotifyParent;

	if (m_Link != LinkNone)
		ModifyStyle(0,SS_NOTIFY);
	else
		ModifyStyle(SS_NOTIFY,0);

	return *this;
}

//////////////////////////////////////////////////////////////////////////
//
// Function:		CXLabel::SetHyperLink
//
// Description:		Sets the label so it becomes hyperlink enabled
//
// INPUTS:          
// 
// RETURNS:         
//
// NOTES:			
// 
// MODIFICATIONS:
//
// Name                     Date        Version Comments
// NT ALMOND				02072002    1.6     Origin
//////////////////////////////////////////////////////////////////////////
CXLabel& CXLabel::SetHyperLink(const CString& sLink)
{
	m_sLink = sLink;

	return *this;
}


void CXLabel::SetHandCursor()
{
    // Get the windows directory
	CString strWndDir;
	GetWindowsDirectory(strWndDir.GetBuffer(MAX_PATH), MAX_PATH);
	strWndDir.ReleaseBuffer();

	strWndDir += _T("\\winhlp32.exe");
	// This retrieves cursor #106 from winhlp32.exe, which is a hand pointer
	HMODULE hModule = LoadLibrary(strWndDir);
	if (hModule) 
	{
		HCURSOR hHandCursor = ::LoadCursor(hModule, MAKEINTRESOURCE(106));
		if (hHandCursor)
		m_hCursor = CopyCursor(hHandCursor);
	}
	FreeLibrary(hModule);
}

void CXLabel::PositionWindow()
{
    if (!::IsWindow(GetSafeHwnd()) || !m_bAdjustToFit) 
        return;

    // Get the current window position
    CRect WndRect, ClientRect;
    GetWindowRect(WndRect);
    GetClientRect(ClientRect);

    ClientToScreen(ClientRect);

    CWnd* pParent = GetParent();
    if (pParent)
    {
        pParent->ScreenToClient(WndRect);
        pParent->ScreenToClient(ClientRect);
    }

    // Get the size of the window text
    CString strWndText;
    GetWindowText(strWndText);

    CDC* pDC = GetDC();
    CFont* pOldFont = pDC->SelectObject(&m_font);
    CSize Extent = pDC->GetTextExtent(strWndText);
    pDC->SelectObject(pOldFont);
    ReleaseDC(pDC);

    // Adjust for window borders
    Extent.cx += WndRect.Width() - ClientRect.Width(); 
    Extent.cy += WndRect.Height() - ClientRect.Height(); 

    // Get the text justification via the window style
    DWORD dwStyle = GetStyle();

    // Recalc the window size and position based on the text justification
    if (dwStyle & SS_CENTERIMAGE)
        WndRect.DeflateRect(0, (WndRect.Height() - Extent.cy)/2);
    else
        WndRect.bottom = WndRect.top + Extent.cy;

    if (dwStyle & SS_CENTER)   
        WndRect.DeflateRect((WndRect.Width() - Extent.cx)/2, 0);
    else if (dwStyle & SS_RIGHT) 
        WndRect.left  = WndRect.right - Extent.cx;
    else // SS_LEFT = 0, so we can't test for it explicitly 
        WndRect.right = WndRect.left + Extent.cx;

    // Move the window
    SetWindowPos(NULL, WndRect.left, WndRect.top, WndRect.Width(), WndRect.Height(), SWP_NOZORDER);
}

void CXLabel::SetAutoSize(BOOL bAutoSize)
{
    m_bAdjustToFit = bAutoSize;

    if (::IsWindow(GetSafeHwnd()))
        PositionWindow();
}

void CXLabel::SetCommand(DWORD comm, COLORREF color)
{
	m_dwCommand = comm;

	SetTransparent(TRUE);
	SetFontUnderline(TRUE);
	SetAutoSize(TRUE);
	SetLink(TRUE,TRUE);
	SetHandCursor();
	SetTextColor(color);
}