Outlook风格的使用不同的颜色单列显示新邮件数 (转)[@more@]

下载演示程序 DOWNLOAD/cooltree_r.zip">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

.NET/develop/article/images/16253_outplay.GIF" align=baseline border=0>

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; SCOlor">//=:GetSysColor(COLOR_HIGHLIGHTTEXT);
}
else if(nItemState & CDIS_SELECTED)
{
::FillRect(hdc, &rcItem, (HBRUSH)m_GrayBrush.m_hObject);
}
else
{
TRACE("CLEAR HIGHn");
// 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(to:email:Outplay@foolab.com">Email:Outplay@foolab.com) 2002.12.29

来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/10752019/viewspace-975827/ ，如需转载，请注明出处，否则将追究法律责任。

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Outlook风格的使用不同的颜色单列显示新邮件数 (转)

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