一个简单的MFC中TreeView使用

今天用MapX写图层管理是，使用TreeView来显示和管理图层，样式模仿ArcGIS的样式，可以通过勾选相应的图层来决定相应的图层是否显示，可是在CTreeCtrl使用上不熟悉，郁闷了好长时间，用从各种地方找了很多资料，有的是对的，有的是部分对的（这个最恶心），有的是全错的。。。不扯了，直接上代码

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void CMy2008302590145View::OnLoadlayer() {     // TODO: Add your command handler code here     //    添加图层     //    方法一：使用MapX自带的默认函数添加图层     //    m_MapX.GetLayers().LayersDlg();     //    m_MapX.SetCurrentTool(miPanTool);     //    方法二：使用自定义对话框添加     CFileDialog *pFileDlg;     pFileDlg = new CFileDialog(TRUE, NULL, NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT|OFN_ALLOWMULTISELECT, _T("图层文件 (*.TAB)|*.TAB|All Files (*.*)|*.*||"));     if (pFileDlg->DoModal() == IDOK)     {         CMapXLayers layers = m_MapX.GetLayers();         POSITION pos = pFileDlg->GetStartPosition();         TVINSERTSTRUCT tvRoot;         tvRoot.hParent = NULL;         tvRoot.hInsertAfter = NULL;         tvRoot.item.mask = TVIF_TEXT;         char* layername;         layername = new char[256];         layerIndex++;         sprintf(layername, "图层%d", layerIndex);         tvRoot.item.pszText = _bstr_t(layername);         HTREEITEM hTreeRoot = m_MapLayerTreeCtrl.InsertItem(&tvRoot);         m_MapLayerTreeCtrl.SetCheck(hTreeRoot, TRUE);         while (pos)         {             itemIndex++;             CString strFilePath = pFileDlg->GetNextPathName(pos);             HTREEITEM tempItem = m_MapLayerTreeCtrl.InsertItem(TVIF_TEXT, strFilePath, 0, 0, 0, 0, 0, hTreeRoot, NULL);             m_MapLayerTreeCtrl.SetItemData(tempItem,itemIndex);             m_MapLayerTreeCtrl.SetCheck(tempItem,TRUE);             layers.Add(strFilePath, itemIndex);         }     } } void CMy2008302590145View::OnZoomin() {     // TODO: Add your command handler code here     m_MapX.SetCurrentTool(miZoomInTool); } void CMy2008302590145View::OnZoomout() {     // TODO: Add your command handler code here     m_MapX.SetCurrentTool(miZoomOutTool); } void CMy2008302590145View::OnPan() {     // TODO: Add your command handler code here     m_MapX.SetCurrentTool(miPanTool); } void CMy2008302590145View::OnNMClickTreeLayers(NMHDR *pNMHDR, LRESULT *pResult) {     // TODO: Add your control notification handler code here     *pResult = 0;     NM_TREEVIEW *pHdr = (NM_TREEVIEW*)pNMHDR;     *pResult = 0;     CPoint point;     UINT uFlag;     GetCursorPos(&point);           //这个很关键，下午我就是这里错了，导致一直结果很诡异。。。     m_MapLayerTreeCtrl.ScreenToClient(&point);           HTREEITEM treeItem = m_MapLayerTreeCtrl.HitTest(point, &uFlag);     if (treeItem && (uFlag & TVHT_ONITEMSTATEICON))     {         BOOL bCheck = m_MapLayerTreeCtrl.GetCheck(treeItem);         if (m_MapLayerTreeCtrl.GetChildItem(treeItem) == NULL)         {             int itemIndex = m_MapLayerTreeCtrl.GetItemData(treeItem);             m_MapX.GetLayers().Item(itemIndex).SetVisible(!bCheck);         }         SetItemCheckState(treeItem, !bCheck);     } } void CMy2008302590145View::SetItemCheckState(HTREEITEM treeItem, bool bCheck) {     SetChildCheck(treeItem, bCheck);     SetParentCheck(treeItem, bCheck); } void CMy2008302590145View::SetChildCheck(HTREEITEM treeItem, bool bCheck) {     HTREEITEM childItem = m_MapLayerTreeCtrl.GetChildItem(treeItem);     while(childItem)     {         m_MapLayerTreeCtrl.SetCheck(childItem,bCheck);         if (m_MapLayerTreeCtrl.GetChildItem(childItem) == NULL)         {             int itemIndex = m_MapLayerTreeCtrl.GetItemData(childItem);             m_MapX.GetLayers().Item(itemIndex).SetVisible(bCheck);         }         SetChildCheck(childItem, bCheck);         childItem = m_MapLayerTreeCtrl.GetNextItem(childItem, TVGN_NEXT);     } } void CMy2008302590145View::SetParentCheck(HTREEITEM treeItem, bool bCheck) {     HTREEITEM parentItem = m_MapLayerTreeCtrl.GetParentItem(treeItem);     if (parentItem == NULL)     {         return;     }     if (bCheck)     {         m_MapLayerTreeCtrl.SetCheck(parentItem,bCheck);     }     else     {         HTREEITEM bro = m_MapLayerTreeCtrl.GetNextItem(treeItem, TVGN_NEXT);         BOOL bFlag = FALSE;         while(bro)         {             if (m_MapLayerTreeCtrl.GetCheck(bro))             {                 bFlag = TRUE;                 break;             }             bro = m_MapLayerTreeCtrl.GetNextItem(bro, TVGN_NEXT);         }         if (!bFlag)         {             bro = m_MapLayerTreeCtrl.GetNextItem(treeItem, TVGN_PREVIOUS);             while(bro)             {                 if (m_MapLayerTreeCtrl.GetCheck(bro))                 {                     bFlag = TRUE;                     break;                 }                 bro = m_MapLayerTreeCtrl.GetNextItem(bro, TVGN_PREVIOUS);             }         }         if (!bFlag)         {             m_MapLayerTreeCtrl.SetCheck(parentItem, FALSE);         }         SetParentCheck(parentItem, m_MapLayerTreeCtrl.GetCheck(parentItem));     } }

代码比较简单，所以就没有写注释