Cbcgptreectrlex control used by BCG

The effect of the official example is as follows ：

  In fact, many effects can be developed without , I cut a lot , The basic functions are as follows ：

Next, step by step, get this effect ：

1、 New project , And drag the control pic control

 2、 Define members , Initialize control

The header file ：CBCGPTreeCtrlEx        m_wndTree;

Implementation file ：

BOOL CTreeCtrlDemoDlg::OnInitDialog()
{
    CBCGPDialog::OnInitDialog();

    UINT nTreeStyles = WS_CHILD | WS_VISIBLE | WS_TABSTOP | WS_BORDER | TVS_LINESATROOT |
        TVS_HASLINES | // The cable
        TVS_HASBUTTONS | // There are buttons
        TVS_CHECKBOXES | // With selection box
        TVS_FULLROWSELECT; // Select the whole line , Be careful not to have TVS_EDITLABELS
        //TVS_EDITLABELS; // Editable

    m_wndTree.CreateOnPlaceHolder(this, IDC_TREE, 0, nTreeStyles);

    {
        m_wndTree.EnableHeader(BCGP_GRID_HEADER_SORT); // Show header 0 Means not to show
        m_wndTree.EnableColumnAutoSize(TRUE); // Set column adaptive width
        m_wndTree.EnableGridLines(TRUE);// Show gridline
        m_wndTree.EnableAlternateRows(TRUE);//
    }
    {
        m_wndTree.DeleteAllItems();
        m_wndTree.DeleteAllColumns();
        m_wndTree.InsertColumn(0, _T("Name"), 100);
        m_wndTree.InsertColumn(1, _T("Size"), 100);

        m_wndTree.SetHeaderAlign(1, HDF_RIGHT);
        m_wndTree.SetColumnAlign(1, HDF_RIGHT);

        HTREEITEM htItem = m_wndTree.InsertItem(_T("test1"));
        m_wndTree.InsertItem(_T("test1_1"), htItem);

        m_wndTree.InsertItem(_T("test2"));
        
        m_wndTree.AdjustLayout();
    }
    
    return TRUE;  // return TRUE  unless you set the focus to a control
}

This is the time The part of the tree structure can be displayed completely

3、 In use , Maintain the tree

Add children ：

void CTreeCtrlDemoDlg::OnBnClickedButton3()
{
    // TODO:   Add control notification handler code here

    HTREEITEM hSelected = m_wndTree.GetSelectedItem();
    HTREEITEM hNew = NULL;

    LPCTSTR lpszItem = _T("New item");

    // Insert as child item
    {
        if (hSelected == NULL)
        {
            return;
        }

        hNew = m_wndTree.InsertItem(lpszItem, hSelected, TVI_LAST);
    }

    m_wndTree.AdjustLayout();
    m_wndTree.RedrawWindow();
    m_wndTree.SelectItem(hNew);

    // update the checkbox of the header control
    m_wndTree.UpdateHeaderCheckbox();

    CEdit* pEdit = m_wndTree.EditLabel(hNew);

    if (pEdit != NULL)
    {
        ASSERT_VALID(pEdit);
        pEdit->SetSel(0, -1); // Select All
    }
}
 

Add peer ：

void CTreeCtrlDemoDlg::OnBnClickedButton2()
{
    // TODO:   Add control notification handler code here
    HTREEITEM hSelected = m_wndTree.GetSelectedItem();
    HTREEITEM hNew = NULL;

    LPCTSTR lpszItem = _T("New item");

    {
        // Insert after the currently selected item
        if (hSelected != NULL)
        {
            HTREEITEM hParent = m_wndTree.GetParentItem(hSelected);
            hNew = m_wndTree.InsertItem(lpszItem, hParent, hSelected);
        }

        // Insert as last
        else
        {
            hNew = m_wndTree.InsertItem(lpszItem);
        }
    }

    m_wndTree.AdjustLayout();
    m_wndTree.RedrawWindow();
    m_wndTree.SelectItem(hNew);

    // update the checkbox of the header control
    m_wndTree.UpdateHeaderCheckbox();

    CEdit* pEdit = m_wndTree.EditLabel(hNew);

    if (pEdit != NULL)
    {
        ASSERT_VALID(pEdit);
        pEdit->SetSel(0, -1); // Select All
    }

}

// Delete operation ：

void CTreeCtrlDemoDlg::OnBnClickedButton1()
{
    // TODO:   Add control notification handler code here

    HTREEITEM hSelected = m_wndTree.GetSelectedItem();
    if (hSelected == NULL)
    {
        return;
    }

    m_wndTree.SelectItem(hSelected); // select only one item if multiple selection
    m_wndTree.SelectSetFirstVisible(hSelected);
    m_wndTree.RedrawWindow();

    if (BCGPMessageBox(L"are you delete?", MB_YESNO) == IDYES)
    {
        HTREEITEM hNext = m_wndTree.GetNextItem(hSelected, TVGN_PREVIOUSVISIBLE);

        m_wndTree.DeleteItem(hSelected);

        m_wndTree.AdjustLayout();
        m_wndTree.SelectItem(hNext);
    }
}

// Expand all levels
void CTreeCtrlDemoDlg::ExpandTreeItem(CBCGPTreeCtrlEx &tree, HTREEITEM hItem, UINT nCode)
{
    HTREEITEM hChild;

    if (tree.ItemHasChildren(hItem))
    {
        tree.Expand(hItem, nCode);
        hChild = tree.GetChildItem(hItem);

        while (hChild)
        {
            ExpandTreeItem(tree, hChild, nCode);
            hChild = tree.GetNextItem(hChild, TVGN_NEXT);
        }
    }
}

void CTreeCtrlDemoDlg::OnExpandAll()
{
    HTREEITEM hItem = m_wndTree.GetRootItem();

    while (hItem)
    {
        ExpandTreeItem(m_wndTree, hItem, TVE_EXPAND);
        hItem = m_wndTree.GetNextItem(hItem, TVGN_NEXT);
    }
}

Last , For example, operations are required after checking , At this time, you can refer to the expanded traversal