分类: C/C++
2008-08-05 13:52:43
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);然后你需要在消息映射中添加:
ON_NOTIFY_REFLECT(NM_CUSTOMDRAW, OnCustomDraw)在OnCusteomDraw消息处理例程中添加如下代码:
void CLeftView::OnCustomDraw(LPNMHDR pNmhdr, LRESULT* pResult) { static CRect rcItem; static int nItemState; LPNMTVCUSTOMDRAW pCustomDraw = (LPNMTVCUSTOMDRAW)pNmhdr; switch (pCustomDraw->nmcd.dwDrawStage) { case CDDS_PREPAINT: // 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; } }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) { // 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); }需要说明的是如果你想支持拖放,那么你必需要做一些修改...... 下载本文示例代码