Outlook风格的单列使用不同的颜色显示新邮件数

作者 Lazen

下载源代码

说做就做，就立刻查找了codeguru里的关于CTreeView的文章，找到了一些合适的信息，大概花了30分钟的时间，终于让我的纷飞(Outplay...)也酷了一把。
Follow me，你会发现它是如此的简单和便捷,仅仅需要在你的CTreeView中添加几行代码而已。

该怎么做呢？(as below)

首先假定你的CTreeView派生类CTreeViewEx,然后你需要在TreeViewEx.h中，添加如下行：

afx_msg void OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult); 

ON_NOTIFY_REFLECT(NM_CUSTOMDRAW, OnCustomDraw) 

void CLeftView::OnCustomDraw(LPNMHDR pNmhdr, LRESULT* pResult){	static CRect	rcItem;	static int	nItemState;	LPNMTVCUSTOMDRAW pCustomDraw = (LPNMTVCUSTOMDRAW)pNmhdr;	switch (pCustomDraw->nmcd.dwDrawStage)	{	case CDDS_PREPAINT:	// 这种情况必须处理，且必须将pResult设置为 CDRF_NOTIFYITEMDRAW,	// 否则父窗口怎么也收不到 CDDS_ITEMPREPAINT 通知消息 (GGH)	*pResult = CDRF_NOTIFYITEMDRAW;	// 重新定位视图窗口，这样 TreeCtrl 的 DefWindowProc 不会重画	//::SetViewportOrgEx(pCustomDraw->nmcd.hdc, /*m_nOffset*/0, 0, NULL);	break;	case CDDS_ITEMPREPAINT:	// 设置背景和前景颜色	nItemState = pCustomDraw->nmcd.uItemState;	pCustomDraw->nmcd.uItemState &= ~CDIS_FOCUS;	pCustomDraw->clrText = m_colHilightText;	// 记住绘制项目的矩形	m_pTree->GetItemRect((HTREEITEM) pCustomDraw->nmcd.dwItemSpec, &rcItem, TRUE);	*pResult = CDRF_NOTIFYPOSTPAINT;	break;	case CDDS_ITEMPOSTPAINT:	DrawTreeItem(nItemState, rcItem, pCustomDraw->nmcd.hdc, (HTREEITEM) pCustomDraw->nmcd.dwItemSpec);	break;	default:	*pResult = CDRF_DODEFAULT;	}} 

void CLeftView::DrawTreeItem(int nItemState, CRect rcItem, HDC hdc, HTREEITEM hItem){	// 如果此项获得输入焦点，则绘制外围矩形并用蓝色填充矩形区域	COLORREF colText = m_colText;	if(nItemState & CDIS_FOCUS)	{	::FillRect(hdc, &rcItem, (HBRUSH)m_BackBrush.m_hObject);	// 新的焦点矩形代码......	::DrawFocusRect( hdc, &rcItem);	colText = m_colHilightText;	}	else if(nItemState & CDIS_SELECTED)	{	::FillRect(hdc, &rcItem, (HBRUSH)m_GrayBrush.m_hObject);	}	else	{	TRACE("CLEAR HIGH\n");	// 清除剩余的高亮条	::FillRect(hdc, &rcItem, (HBRUSH)m_BackBrushNormal.m_hObject);	}	// 总是要写没有背景的文本	::SetBkMode(hdc, TRANSPARENT);	::SetTextColor(hdc,colText);	CString str = m_pTree->GetItemText(hItem);	::DrawText(hdc, str, -1, &rcItem, DT_VCENTER | DT_SINGLELINE | DT_WORD_ELLIPSIS);	int nNew = 20;	CString strNew = _T("");	strNew.Format(_T("(%d)"),nNew);	::SetTextColor(hdc,RGB(0,0,255));	RECT rc = rcItem;	rc.left = rcItem.right+2;	rc.right = rc.left + 100;	::FillRect(hdc, &rc, (HBRUSH)m_BackBrushNormal.m_hObject);	::DrawText(hdc,strNew, -1, &rc, DT_VCENTER | DT_SINGLELINE | DT_WORD_ELLIPSIS);}