Owner Drawn ListViews In WTL

#include "stdafx.h"
#include ".\demoownerdrawnlistviewctrl.h"

void CDemoOwnerDrawnListViewCtrl::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
	HDC dc = lpDrawItemStruct->hDC;
	CRect item_rect = lpDrawItemStruct->rcItem;
	int item_id = lpDrawItemStruct->itemID;

	bool checkered_toggle = (item_id % 2) != 0;
	int cols = GetHeader().GetItemCount();
	for(int n = 0; n < cols; n++)
	{
		CRect cell_rect;
		GetCellRect(n, item_rect, cell_rect);

		COLORREF square_color;

		if(lpDrawItemStruct->itemState & ODS_SELECTED)
		{
			square_color = GetSysColor(COLOR_HIGHLIGHT);
			::SetTextColor(dc, GetSysColor(COLOR_HIGHLIGHTTEXT));
		}
		else
		{
			square_color = 
				checkered_toggle ? RGB(230, 244, 255) : RGB(145, 200, 255);	
			::SetTextColor(dc, GetSysColor(COLOR_BTNTEXT));
		}

		HPEN square_pen = CreatePen(PS_SOLID, 1, square_color);
		HBRUSH squares_brush = CreateSolidBrush(square_color);
		SelectObject(dc, square_pen);
		SelectObject(dc, squares_brush);
		Rectangle(dc, cell_rect.left, cell_rect.top, 
					cell_rect.right, cell_rect.bottom);
		DeleteObject(square_pen);
		DeleteObject(squares_brush);
		
		std::stringstream ss;
		ss << item_id << _T(":") << n;

		DrawText(dc, ss.str().c_str(), ss.str().size(), cell_rect, 
					DT_CENTER | DT_END_ELLIPSIS | DT_VCENTER | DT_SINGLELINE);

		checkered_toggle = !checkered_toggle;
	}
}

void CDemoOwnerDrawnListViewCtrl::MeasureItem(LPMEASUREITEMSTRUCT lpMeasureItemStruct)
{
	CClientDC dc(m_hWnd);
	TEXTMETRIC tm;

	dc.SelectFont(GetFont());
	dc.GetTextMetrics(&tm);

	lpMeasureItemStruct->itemHeight = 
		(tm.tmHeight + tm.tmExternalLeading) * 2;
}