樹形控件

MFC中使用CTreeCtrl類來封裝樹形控件各種操作，樹形控件可以用于樹形結(jié)構(gòu)，比如目錄樹等。其中有一個(gè)根節(jié)點(diǎn)root，下面有很多子節(jié)點(diǎn)。

常用屬性配置：

初始化

設(shè)置圖標(biāo)并添加根節(jié)點(diǎn)和子節(jié)點(diǎn)：

m_icon_list.Create(32, 32, ILC_COLOR32, 3, 3);

UINT icons[] = { IDI_ICON_BTC32, IDI_ICON_LTC32, IDI_ICON_XRP32 };

for (int i = 0; i 3; i++)

展開全文

m_icon_list.Add(AfxGetApp()-LoadIconW(icons[i]));

m_tree.SetImageList(m_icon_list, L對(duì)陣IL_NORMAL);

HTREEITEM root1 = m_tree.InsertItem(_T("root1"), 0, 0);

HTREEITEM root2 = m_tree.InsertItem(_T("root2"), 1, 1);

HTREEITEM sub1 = m_tree.InsertItem(_T("sub1"), 2, 2, root1);

m_tree.Expand(root1, TVE_EXPAND);

添加節(jié)點(diǎn)

void CMyDlg::OnBnClickedBtnAdd()

{

UpdateData(TRUE);

if (!m_string.GetLength()) {

AfxMessageBox(_T("請(qǐng)輸入文本"));

return;

}

HTREEITEM item = m_tree.GetSelectedItem();

if (!item) item = TVI_ROOT;

TVINSERTSTRUCT ts = { 0 };

ts.hParent = item;

ts.hInsertAfter = TVI_LAST;

ts.item.pszText = m_string.GetBuffer();

ts.item.mask = TVIF_TEXT | TVIF_IMAGE;

HTREEITEM new_item = m_tree.InsertItem(ts);

m_tree.SelectItem(new_item);

m_tree.EnsureVisible(new_item);

m_string = _T("");

UpdateData(FALSE);

}

刪除節(jié)點(diǎn)

void CMyDlg::OnBnClickedBtnDel()

{

HTREEITEM item = m_tree.GetSelectedItem();

if (!item) {

AfxMessageBox(_T("請(qǐng)選擇一個(gè)節(jié)點(diǎn)"));

return;

}

HTREEITEM parent = m_tree.GetParentItem(item);

m_tree.DeleteItem(item);

m_tree.SelectItem(parent);

}

修改節(jié)點(diǎn)

void CMyDlg::OnBnClickedBtnModify()

{

UpdateData(TRUE);

HTREEITEM item = m_tree.GetSelectedItem();

if (!item) {

AfxMessageBox(_T("請(qǐng)選擇一個(gè)節(jié)點(diǎn)"));

return;

}

if (!m_string.GetLength()) {

AfxMessageBox(_T("請(qǐng)輸入文本"));

return;

}

m_tree.SetItemText(item, m_string);

}

添加事情

選擇節(jié)點(diǎn)，編輯框顯示節(jié)點(diǎn)中的內(nèi)容：

void CMyDlg::OnTvnSelchangedTree(NMHDR* pNMHDR, LRESULT* pResult)

{

LPNMTREEVIEW pNMTreeView = reinterpret_cast(pNMHDR);

UpdateData(TRUE);

HTREEITEM item = m_tree.GetSelectedItem();

if (!item) {

AfxMessageBox(_T("請(qǐng)選擇一個(gè)節(jié)點(diǎn)"));

return;

}

m_string = m_tree.GetItemText(item);

UpdateData(FALSE);

*pResult = 0;

}