resizablelayout.cpp

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	ATOM atomWndClass = (ATOM)::GetClassLong(hWnd, GCW_ATOM);
	if (atomWndClass == (ATOM)0x8002)
	{
		// send a message to the dialog box
		hBrush = (HBRUSH)::SendMessage(hWnd, WM_CTLCOLORDLG,
			(WPARAM)hDC, (LPARAM)hWnd);
	}
	else
	{
		// take the background brush from the window's class
		hBrush = (HBRUSH)::GetClassLong(hWnd, GCL_HBRBACKGROUND);
	}

	// fill the clipped background
	CRgn rgn;
	GetClippingRegion(&rgn);

  ::FillRgn(hDC, rgn, hBrush);
}

void CResizableLayout::EraseBackground(CDC* pDC)
{
//	HWND hWnd = GetResizableWnd()->GetSafeHwnd();
//
//	// retrieve the background brush
//	HBRUSH hBrush = NULL;
//
//	// is this a dialog box?
//	// (using class atom is quickier than using the class name)
//	ATOM atomWndClass = (ATOM)::GetClassLong(hWnd, GCW_ATOM);
//	if (atomWndClass == (ATOM)0x8002)
//	{
//		// send a message to the dialog box
//		hBrush = (HBRUSH)::SendMessage(hWnd, WM_CTLCOLORDLG,
//			(WPARAM)pDC->GetSafeHdc(), (LPARAM)hWnd);
//	}
//	else
//	{
//		// take the background brush from the window's class
//		hBrush = (HBRUSH)::GetClassLong(hWnd, GCL_HBRBACKGROUND);
//	}
//
//	// fill the clipped background
//	CRgn rgn;
//	GetClippingRegion(&rgn);
//
//	::FillRgn(pDC->GetSafeHdc(), rgn, hBrush);
  EraseBackground( pDC->GetSafeHdc() );
}

// support legacy code (will disappear in future versions)
void CResizableLayout::ClipChildren(CDC* pDC)
{
	CRgn rgn;
	GetClippingRegion(&rgn);
	// the clipping region is in device units
	rgn.OffsetRgn(-pDC->GetWindowOrg());
	pDC->SelectClipRgn(&rgn);
}

void CResizableLayout::GetTotalClientRect(LPRECT lpRect)
{
	GetResizableWnd()->GetClientRect(lpRect);
}

BOOL CResizableLayout::NeedsRefresh(const CResizableLayout::LayoutInfo& layout,
									const CRect& rectOld, const CRect& rectNew)
{
	if (layout.bMsgSupport)
	{
		REFRESHPROPERTY refresh;
		refresh.rcOld = rectOld;
		refresh.rcNew = rectNew;
		if (Send_NeedsRefresh(layout.hWnd, &refresh))
			return refresh.bNeedsRefresh;
	}

	int nDiffWidth = (rectNew.Width() - rectOld.Width());
	int nDiffHeight = (rectNew.Height() - rectOld.Height());

	// is the same size?
	if (nDiffWidth == 0 && nDiffHeight == 0)
		return FALSE;

	// optimistic, no need to refresh
	BOOL bRefresh = FALSE;

	// window classes that need refresh when resized
	if (layout.sWndClass == WC_STATIC)
	{
		DWORD style = ::GetWindowLong(layout.hWnd, GWL_STYLE);

		switch (style & SS_TYPEMASK)
		{
		case SS_LEFT:
		case SS_CENTER:
		case SS_RIGHT:
			// word-wrapped text
			bRefresh = bRefresh || (nDiffWidth != 0);
			// vertically centered text
			if (style & SS_CENTERIMAGE)
				bRefresh = bRefresh || (nDiffHeight != 0);
			break;

		case SS_LEFTNOWORDWRAP:
			// text with ellipsis
			if (style & SS_ELLIPSISMASK)
				bRefresh = bRefresh || (nDiffWidth != 0);
			// vertically centered text
			if (style & SS_CENTERIMAGE)
				bRefresh = bRefresh || (nDiffHeight != 0);
			break;

		case SS_ENHMETAFILE:
		case SS_BITMAP:
		case SS_ICON:
			// images
		case SS_BLACKFRAME:
		case SS_GRAYFRAME:
		case SS_WHITEFRAME:
		case SS_ETCHEDFRAME:
			// and frames
			bRefresh = TRUE;
			break;
		}
	}

	// window classes that don't redraw client area correctly
	// when the hor scroll pos changes due to a resizing
	BOOL bHScroll = FALSE;
	if (layout.sWndClass == WC_LISTBOX)
		bHScroll = TRUE;

	// fix for horizontally scrollable windows
	if (bHScroll && (nDiffWidth > 0))
	{
		// get max scroll position
		SCROLLINFO info;
		info.cbSize = sizeof(SCROLLINFO);
		info.fMask = SIF_PAGE | SIF_POS | SIF_RANGE;
		if (::GetScrollInfo(layout.hWnd, SB_HORZ, &info))
		{
			// subtract the page size
			info.nMax -= __max(info.nPage-1,0);
		}

		// resizing will cause the text to scroll on the right
		// because the scrollbar is going beyond the right limit
		if ((info.nMax > 0) && (info.nPos + nDiffWidth > info.nMax))
		{
			// needs repainting, due to horiz scrolling
			bRefresh = TRUE;
		}
	}

	return bRefresh;
}

BOOL CResizableLayout::LikesClipping(const CResizableLayout::LayoutInfo& layout)
{
	if (layout.bMsgSupport)
	{
		CLIPPINGPROPERTY clipping;
		if (Send_LikesClipping(layout.hWnd, &clipping))
			return clipping.bLikesClipping;
	}

	DWORD style = ::GetWindowLong(layout.hWnd, GWL_STYLE);

	// skip windows that wants background repainted
	if (layout.sWndClass == TOOLBARCLASSNAME && (style & TBSTYLE_TRANSPARENT))
		return FALSE;
	else if (layout.sWndClass == WC_BUTTON)
	{
		CRect rect;
		switch (style & _BS_TYPEMASK)
		{
		case BS_GROUPBOX:
			return FALSE;

		case BS_OWNERDRAW:
			// ownerdraw buttons must return correct hittest code
			// to notify their transparency to the system and this library
			::GetWindowRect(layout.hWnd, &rect);
			if ( HTTRANSPARENT == ::SendMessage(layout.hWnd,
				WM_NCHITTEST, 0, MAKELPARAM(rect.left, rect.top)) )
				return FALSE;
			break;
		}
		return TRUE;
	}
	else if (layout.sWndClass == WC_STATIC)
	{
		switch (style & SS_TYPEMASK)
		{
		case SS_LEFT:
		case SS_CENTER:
		case SS_RIGHT:
		case SS_SIMPLE:
		case SS_LEFTNOWORDWRAP:
			// text
		case SS_BLACKRECT:
		case SS_GRAYRECT:
		case SS_WHITERECT:
			// filled rects
		case SS_ETCHEDHORZ:
		case SS_ETCHEDVERT:
			// etched lines
		case SS_BITMAP:
			// bitmaps
			return TRUE;
			break;

		case SS_ICON:
		case SS_ENHMETAFILE:
			if (style & SS_CENTERIMAGE)
				return FALSE;
			return TRUE;
			break;

		default:
			return FALSE;
		}
	}

	// assume the others like clipping
	return TRUE;
}

void CResizableLayout::CalcNewChildPosition(const CResizableLayout::LayoutInfo& layout,
								const CRect &rectParent, CRect &rectChild, UINT& uFlags)
{
	CWnd* pParent = GetResizableWnd();

	::GetWindowRect(layout.hWnd, &rectChild);
	::MapWindowPoints(NULL, pParent->m_hWnd, (LPPOINT)&rectChild, 2);
	
	CRect rectNew;

	// calculate new top-left corner
	rectNew.left = layout.sizeMarginTL.cx + rectParent.Width() * layout.sizeTypeTL.cx / 100;
	rectNew.top = layout.sizeMarginTL.cy + rectParent.Height() * layout.sizeTypeTL.cy / 100;
	
	// calculate new bottom-right corner
	rectNew.right = layout.sizeMarginBR.cx + rectParent.Width() * layout.sizeTypeBR.cx / 100;
	rectNew.bottom = layout.sizeMarginBR.cy + rectParent.Height() * layout.sizeTypeBR.cy / 100;

	// adjust position, if client area has been scrolled
	rectNew.OffsetRect(rectParent.TopLeft());

	// get the refresh property
	BOOL bRefresh = layout.properties.bAskRefresh ?
		NeedsRefresh(layout, rectChild, rectNew) : layout.properties.bCachedNeedsRefresh;

	// set flags 
	uFlags = SWP_NOZORDER | SWP_NOACTIVATE | SWP_NOREPOSITION;
	if (bRefresh)
		uFlags |= SWP_NOCOPYBITS;
	if (rectNew.TopLeft() == rectChild.TopLeft())
		uFlags |= SWP_NOMOVE;
	if (rectNew.Size() == rectChild.Size())
		uFlags |= SWP_NOSIZE;

	// update rect
	rectChild = rectNew;
}

void CResizableLayout::InitResizeProperties(CResizableLayout::LayoutInfo &layout)
{
	// check if custom window supports this library
	// (properties must be correctly set by the window)
	layout.bMsgSupport = Send_QueryProperties(layout.hWnd, &layout.properties);

	// default properties
	if (!layout.bMsgSupport)
	{
		// clipping property is assumed as static
		layout.properties.bAskClipping = FALSE;
		layout.properties.bCachedLikesClipping = LikesClipping(layout);
		// refresh property is assumed as dynamic
		layout.properties.bAskRefresh = TRUE;
	}
}