TreeView復選框無法正確顯示

Question

我需要一些帶有復選框的TreeView幫助，因為在隱藏父節點的復選框並將其僅保留給子節點的復選框之后，它們會切穿。 樹形視圖如下所示：

我用來隱藏父節點復選框的代碼是這樣的：

private const int TVIF_STATE = 0x8;
private const int TVIS_STATEIMAGEMASK = 0xF000;
private const int TV_FIRST = 0x1100;
private const int TVM_SETITEM = TV_FIRST + 63;

[StructLayout(LayoutKind.Sequential, Pack = 8, CharSet = CharSet.Auto)]
private struct TVITEM
{
    public int mask;
    public IntPtr hItem;
    public int state;
    public int stateMask;
    [MarshalAs(UnmanagedType.LPTStr)]
    public string lpszText;
    public int cchTextMax;
    public int iImage;
    public int iSelectedImage;
    public int cChildren;
    public IntPtr lParam;
}

[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, ref TVITEM lParam);

/// <summary>
/// Hides the checkbox for the specified node on a TreeView control.
/// </summary>
private void HideCheckBox(TreeView tvw, TreeNode node)
{
    TVITEM tvi = new TVITEM();
    tvi.hItem = node.Handle;
    tvi.mask = TVIF_STATE;
    tvi.stateMask = TVIS_STATEIMAGEMASK;
    tvi.state = 0;
    SendMessage(tvw.Handle, TVM_SETITEM, IntPtr.Zero, ref tvi);
}

void sharedFolders_DrawNode(object sender, DrawTreeNodeEventArgs e)
{
    if (e.Node.Level == 1 || e.Node.Level == 0)
        HideCheckBox(sharedFolders, e.Node);
    e.DrawDefault = true;
}

誰能幫我顯示完整的復選框？

Answer 1

嘗試將TreeView DrawMode更改為OwnerDrawAll ：

sharedFolders.DrawMode = TreeViewDrawMode.OwnerDrawAll;