Tree Views

Wraps the tree view control

2025-12-02

Written by: xiaobin

CTreeCtrl and CTreeView:

One uses a variable directly

m_myTreeCtl

the other uses GetTreeCtrl()
MyExplorer2.1.zip - demo

Set New Style

Direct settings
Indirect setting

default value:

TVS_HASBUTTONS
TVS_HASLINES
TVS_LINESATROOT

Direct settings

    GetTreeCtrl().ModifyStyle(0, TVS_HASBUTTONS);
    GetTreeCtrl().ModifyStyle(0, TVS_HASLINES);
    GetTreeCtrl().ModifyStyle(0, TVS_LINESATROOT);

Indirect settings

First obtain the handle, then set the Tree-View Control Window Styles.

void CLeftView::SetNewStyle(long lStyleMask, BOOL bSetBits)
{
    long        lStyleOld;

    lStyleOld = GetWindowLongPtr(GetTreeCtrl().GetSafeHwnd(), GWL_STYLE);

    lStyleOld &= ~lStyleMask;
    if (bSetBits)
        lStyleOld |= lStyleMask;

    SetWindowLongPtr(GetTreeCtrl().GetSafeHwnd(), GWL_STYLE, lStyleOld);
    SetWindowPos(NULL, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE | SWP_NOZORDER);
}

The example comes from “hyun” and “CMyTreeCtrl::SetNewStyle”

data mgr - insert

    for (iItem = 0; iItem < sizeof(strItems) / sizeof(strItems[0]); iItem++)
    {
        curTreeItem.hParent = (iItem % 4 == 0)? NULL : m_rghItem[iItem / 4 * 4];
        curTreeItem.hInsertAfter = TVI_SORT;
        curTreeItem.item.iImage = iItem / 4 * 2;
        curTreeItem.item.iSelectedImage = curTreeItem.item.iImage + 1;
        curTreeItem.item.pszText = strItems[iItem].GetBuffer(strItems[iItem].GetLength());
        curTreeItem.item.mask = TVIF_IMAGE | TVIF_SELECTEDIMAGE | TVIF_TEXT;
        m_rghItem[iItem] = GetTreeCtrl().InsertItem(&curTreeItem);
    }

data

    HTREEITEM   m_rghItem[12];

    CString             strItems[12];
    int                 iItem;
    TV_INSERTSTRUCT     curTreeItem;

    strItems[0] = _T("Dogs");
    strItems[1] = _T("German Shepherd");
    strItems[2] = _T("Dalmatian");
    strItems[3] = _T("Great Dane");
    strItems[4] = _T("Birds");
    strItems[5] = _T("Hummingbird");
    strItems[6] = _T("Pigeon");
    strItems[7] = _T("Eagle");
    strItems[8] = _T("Fish");
    strItems[9] = _T("Snapper");
    strItems[10] = _T("Sole");
    strItems[11] = _T("Salmon");