Outlook风格的单列使用不同的颜色显示新邮件数

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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 CRectrcItem;static intnItemState;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 HIGHn");// 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);}