Outlook风格的使用不同的颜色单列显示新邮件数

下载演示程序        http://www.foolab.com/download/cooltree_r.zip 下载源代码           http://www.foolab.com/download/cooltree.zip 下载纷飞（Outplay...)http://www.foolab.com/download/outplay_1.03.zip   动机（Motivation）   当我利用业余时间开发完成纷飞(Outplay...),类似Outlook的客户端的邮件程序后， 我终于轻松地跳了起来，但是就在我的脚刚着地时，我突然看到我面前使用的Outlook, 单列使用不同的颜色显示新邮件，于是我决定，我也该让我的Outplay如此...   于是，我立刻查找了codeguru里的关于CTreeView的一些文章，我找到了一些合适的信 息，大该花了我30分钟左右的时间，我让我的纷飞(Outplay...)也出现了类似的效果。 让我慢慢的告诉你，你也会发现它是如此的简单和方便,仅仅是在你的CTreeView中添加 几行的代码   你应该怎么做呢？(Follow me)   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);   然后你需要在你的消息映射中添加 ON_NOTIFY_REFLECT(NM_CUSTOMDRAW, OnCustomDraw) 在OnCusteomDraw中添加如下代码： void CLeftView::OnCustomDraw(LPNMHDR pNmhdr, LRESULT* pResult)
{
 static CRect rcItem;
 static int  nItemState;    LPNMTVCUSTOMDRAW pCustomDraw = (LPNMTVCUSTOMDRAW)pNmhdr;
 switch (pCustomDraw->nmcd.dwDrawStage)
 {
  case CDDS_PREPAINT:
   // Need to process this case and set pResult to CDRF_NOTIFYITEMDRAW,
   // otherwise parent will never receive CDDS_ITEMPREPAINT notification. (GGH)
   *pResult = CDRF_NOTIFYITEMDRAW;      // reposuition the viewport so the TreeCtrl DefWindowProc doesn't draw to viewport 0/0
   //::SetViewportOrgEx(pCustomDraw->nmcd.hdc, /*m_nOffset*/0, 0, NULL);
   break;     case CDDS_ITEMPREPAINT:
   // set the background and foregroundcolor of the item to the background, so you don't see the default drawing of the text
   //get item state(focus,selected..), because it will be drawn of us
   nItemState = pCustomDraw->nmcd.uItemState;      pCustomDraw->nmcd.uItemState &= ~CDIS_FOCUS;
   pCustomDraw->clrText = m_colHilightText;
   // remember the drawing rectangle of the item so we can draw it ourselves
   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;
 }
}   最后你需要做的只是在DrawTreeItem中自绘你想要的得效果就是了如下： void CLeftView::DrawTreeItem(int nItemState, CRect rcItem, HDC hdc, HTREEITEM hItem)
{
 // if the item has got the focus, we have to draw sorouinding rectangle and fill a rect blue
 COLORREF colText = m_colText;    if(nItemState & CDIS_FOCUS)
 {
  ::FillRect(hdc, &rcItem, (HBRUSH)m_BackBrush.m_hObject);
  // Add new focus rect code...
  ::DrawFocusRect( hdc, &rcItem);
  colText = m_colHilightText; //=:GetSysColor(COLOR_HIGHLIGHTTEXT);
 }
 else if(nItemState & CDIS_SELECTED)
 {
  ::FillRect(hdc, &rcItem, (HBRUSH)m_GrayBrush.m_hObject);
 }
 else
 {
  TRACE("CLEAR HIGH\n");
   // add this to clear leftover highlight bar
  ::FillRect(hdc, &rcItem, (HBRUSH)m_BackBrushNormal.m_hObject);
 }     // always write text without background
 ::SetBkMode(hdc, TRANSPARENT);
 ::SetTextColor(hdc,colText);
 CString str = m_pTree->GetItemText(hItem);
 ::DrawText(hdc, str, -1, &rcItem, DT_VCENTER | DT_SINGLELINE | DT_WORD_ELLIPSIS);
  // you may modify them according to your need
 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);
}   需要说明的是如果你支持拖放而且你需要做一些改变。             愿你快乐              Lazen(Email:[email protected]) 2002.12.29           

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