roundbutton.cpp

网上的使用vc++圆形按钮制作源代码.Vertical and square resource-buttons get circular. Horizontal, non-square, resour

CRoundButton::~CRoundButton()
{
	m_rgn.DeleteObject();
}

BEGIN_MESSAGE_MAP(CRoundButton, CButton)
	//{{AFX_MSG_MAP(CRoundButton)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRoundButton message handlers

void CRoundButton::PreSubclassWindow() 
{
	CButton::PreSubclassWindow();

	ModifyStyle(0, BS_OWNERDRAW);

	CRect rect;
	GetClientRect(rect);

	// set m_bStretch if the button is not square and landscape 
	m_bStretch = rect.Width() > rect.Height() ? TRUE : FALSE;

	// Resize the window to make it square if it is not stretched
	if(!m_bStretch)	rect.bottom = rect.right = min(rect.bottom,rect.right);

	// Get the vital statistics of the window
	// m_ptLeft/m_ptRight are the centerpoints of the left/right arcs of stretched buttons
	m_ptCentre = m_ptLeft = m_ptRight = rect.CenterPoint();

	m_nRadius  = rect.bottom/2-1;

	m_ptLeft.x = m_nRadius;
	m_ptRight.x = rect.right - m_nRadius - 1;

	// Set the window region so mouse clicks only activate the round section 
	// of the button
	m_rgn.DeleteObject(); 
	SetWindowRgn(NULL, FALSE);
	m_rgn.CreateEllipticRgnIndirect(rect);
	SetWindowRgn(m_rgn, TRUE);

	// Convert client coords to the parents client coords
	ClientToScreen(rect);
	CWnd* pParent = GetParent();
	if (pParent) pParent->ScreenToClient(rect);

	// Resize the window if it is not stretched
	if(!m_bStretch)	MoveWindow(rect.left, rect.top, rect.Width(), rect.Height(), TRUE);
}

void CRoundButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) 
{
	ASSERT(lpDrawItemStruct != NULL);
	
	CDC* pDC   = CDC::FromHandle(lpDrawItemStruct->hDC);
	CRect rect = lpDrawItemStruct->rcItem;
	UINT state = lpDrawItemStruct->itemState;
	UINT nStyle = GetStyle();
	int nRadius = m_nRadius;

	int nSavedDC = pDC->SaveDC();

	pDC->SelectStockObject(NULL_BRUSH);
	pDC->FillSolidRect(rect, ::GetSysColor(COLOR_BTNFACE));

	// Draw the focus circle around the button for non-stretched buttons
	if ((state & ODS_FOCUS) && m_bDrawDashedFocusCircle && !m_bStretch)
		DrawCircle(pDC, m_ptCentre, nRadius--, RGB(0,0,0));

	// Draw the raised/sunken edges of the button (unless flat)
	if (nStyle & BS_FLAT) {

		// for stretched buttons: draw left and right arcs and connect the with lines
		if(m_bStretch)
		{
			CPen* oldpen;
			
			CRect LeftBound(0,0,nRadius*2,nRadius*2);
			CRect RightBound(m_ptRight.x-nRadius,0,m_ptRight.x+nRadius,nRadius*2);

			oldpen = pDC->SelectObject(new CPen(PS_SOLID, 1, ::GetSysColor(COLOR_3DDKSHADOW)));
			pDC->Arc(LeftBound, CPoint(m_ptLeft.x,0), CPoint(m_ptLeft.x,nRadius*2));
			pDC->Arc(RightBound, CPoint(m_ptRight.x,nRadius*2), CPoint(m_ptRight.x,0));
			pDC->MoveTo(m_ptLeft.x,0); pDC->LineTo(m_ptRight.x,0);
			pDC->MoveTo(m_ptLeft.x,nRadius*2-1); pDC->LineTo(m_ptRight.x,nRadius*2-1);

			nRadius--;
			LeftBound.DeflateRect(1,1);
			RightBound.DeflateRect(1,1);

			delete pDC->SelectObject(new CPen(PS_SOLID, 1, ::GetSysColor(COLOR_3DHIGHLIGHT)));
			pDC->Arc(LeftBound, CPoint(m_ptLeft.x,1), CPoint(m_ptLeft.x,nRadius*2));
			pDC->Arc(RightBound, CPoint(m_ptRight.x,nRadius*2), CPoint(m_ptRight.x,0));
			pDC->MoveTo(m_ptLeft.x,1); pDC->LineTo(m_ptRight.x,1);
			pDC->MoveTo(m_ptLeft.x,nRadius*2); pDC->LineTo(m_ptRight.x,nRadius*2);

			delete pDC->SelectObject(oldpen);
		}

		// for non-stretched buttons: draw two circles
		else
		{
			DrawCircle(pDC, m_ptCentre, nRadius--, ::GetSysColor(COLOR_3DDKSHADOW));
			DrawCircle(pDC, m_ptCentre, nRadius--, ::GetSysColor(COLOR_3DHIGHLIGHT));
		}
	} else {
		if ((state & ODS_SELECTED))	{

			// draw the circular segments for stretched AND non-stretched buttons
			DrawCircleLeft(pDC, m_ptLeft, nRadius, 
					   ::GetSysColor(COLOR_3DDKSHADOW), ::GetSysColor(COLOR_3DHIGHLIGHT));
			DrawCircleRight(pDC, m_ptRight, nRadius, 
					   ::GetSysColor(COLOR_3DDKSHADOW), ::GetSysColor(COLOR_3DHIGHLIGHT));
			DrawCircleLeft(pDC, m_ptLeft, nRadius-1, 
					   ::GetSysColor(COLOR_3DSHADOW), ::GetSysColor(COLOR_3DLIGHT));
			DrawCircleRight(pDC, m_ptRight, nRadius-1, 
					   ::GetSysColor(COLOR_3DSHADOW), ::GetSysColor(COLOR_3DLIGHT));

			// draw connecting lines for stretched buttons only
			if (m_bStretch)
			{
				CPen* oldpen;
				CPen* mypen;

				oldpen = pDC->SelectObject(new CPen(PS_SOLID, 1, ::GetSysColor(COLOR_3DDKSHADOW)));
				pDC->MoveTo(m_ptLeft.x, 1); pDC->LineTo(m_ptRight.x, 1);

				delete pDC->SelectObject(new CPen(PS_SOLID, 1, ::GetSysColor(COLOR_3DSHADOW)));
				pDC->MoveTo(m_ptLeft.x, 2);	pDC->LineTo(m_ptRight.x, 2);

				delete pDC->SelectObject(new CPen(PS_SOLID, 1, ::GetSysColor(COLOR_3DLIGHT)));
				pDC->MoveTo(m_ptLeft.x, m_ptLeft.y + nRadius-1); pDC->LineTo(m_ptRight.x, m_ptLeft.y + nRadius-1);

				delete pDC->SelectObject(new CPen(PS_SOLID, 1, ::GetSysColor(COLOR_3DHIGHLIGHT)));
				pDC->MoveTo(m_ptLeft.x, m_ptLeft.y + nRadius); pDC->LineTo(m_ptRight.x, m_ptLeft.y + nRadius);

				delete pDC->SelectObject(oldpen);
			}
					   
		} else {

			// draw the circular segments for stretched AND non-stretched buttons
			DrawCircleLeft(pDC, m_ptLeft, nRadius, 
					   ::GetSysColor(COLOR_3DHIGHLIGHT), ::GetSysColor(COLOR_3DDKSHADOW));
			DrawCircleRight(pDC, m_ptRight, nRadius, 
					   ::GetSysColor(COLOR_3DHIGHLIGHT), ::GetSysColor(COLOR_3DDKSHADOW));
			DrawCircleLeft(pDC, m_ptLeft, nRadius - 1, 
					   ::GetSysColor(COLOR_3DLIGHT), ::GetSysColor(COLOR_3DSHADOW));
			DrawCircleRight(pDC, m_ptRight, nRadius - 1, 
					   ::GetSysColor(COLOR_3DLIGHT), ::GetSysColor(COLOR_3DSHADOW));

			// draw connecting lines for stretched buttons only
			if (m_bStretch)
			{
				CPen* oldpen;

				oldpen = pDC->SelectObject(new CPen(PS_SOLID, 1, pDC->GetPixel(m_ptLeft.x, 1)));
				pDC->MoveTo(m_ptLeft.x, 1); pDC->LineTo(m_ptRight.x, 1);

				delete pDC->SelectObject(new CPen(PS_SOLID, 1, pDC->GetPixel(m_ptLeft.x, 2)));
				pDC->MoveTo(m_ptLeft.x, 2); pDC->LineTo(m_ptRight.x, 2);

				delete pDC->SelectObject(new CPen(PS_SOLID, 1, pDC->GetPixel(m_ptLeft.x, m_ptLeft.y + nRadius)));
				pDC->MoveTo(m_ptLeft.x, m_ptLeft.y + nRadius); pDC->LineTo(m_ptRight.x, m_ptLeft.y + nRadius);

				delete pDC->SelectObject(new CPen(PS_SOLID, 1, pDC->GetPixel(m_ptLeft.x, m_ptLeft.y + nRadius - 1)));
				pDC->MoveTo(m_ptLeft.x, m_ptLeft.y + nRadius - 1); pDC->LineTo(m_ptRight.x, m_ptLeft.y + nRadius - 1);
				
				delete pDC->SelectObject(oldpen);
			}
		}
	}
	
	// draw the text if there is any
	CString strText;
	GetWindowText(strText);

	if (!strText.IsEmpty())
	{
		CRgn rgn;

		if (m_bStretch){
		rgn.CreateRectRgn(m_ptLeft.x-nRadius/2, m_ptCentre.y-nRadius, 
			m_ptRight.x+nRadius/2, m_ptCentre.y+nRadius);}

		else{
		rgn.CreateEllipticRgn(m_ptCentre.x-nRadius, m_ptCentre.y-nRadius, 
			m_ptCentre.x+nRadius, m_ptCentre.y+nRadius);}

		pDC->SelectClipRgn(&rgn);

		CSize Extent = pDC->GetTextExtent(strText);
		CPoint pt = CPoint( m_ptCentre.x - Extent.cx/2, m_ptCentre.y - Extent.cy/2 );

		if (state & ODS_SELECTED) pt.Offset(1,1);

		pDC->SetBkMode(TRANSPARENT);

		if (state & ODS_DISABLED)
			pDC->DrawState(pt, Extent, strText, DSS_DISABLED, TRUE, 0, (HBRUSH)NULL);
		else
		{
			// changed this code to give the text a 3d-look
			COLORREF oldcol = pDC->SetTextColor(::GetSysColor(COLOR_3DHIGHLIGHT));
			pDC->TextOut(pt.x, pt.y, strText);
			pDC->SetTextColor(::GetSysColor(COLOR_3DDKSHADOW));
			pDC->TextOut(pt.x-1, pt.y-1, strText);
			pDC->SetTextColor(oldcol);
		}

		pDC->SelectClipRgn(NULL);
		rgn.DeleteObject();
	}

	// Draw the focus circle on the inside of the button if it is non-stretched
	if ((state & ODS_FOCUS) && m_bDrawDashedFocusCircle && !m_bStretch)
		DrawCircle(pDC, m_ptCentre, nRadius-2, RGB(0,0,0), TRUE);

	pDC->RestoreDC(nSavedDC);
}