public static void SetDropHilited(this TreeNode node, bool value)
{
if (node == null)
{
throw new ArgumentNullException();
}
if (!((node.TreeView != null) && node.TreeView.IsHandleCreated))
{
throw new InvalidOperationException();
}
if (value)
{
Windows.SendMessage(node.TreeView.Handle, 0x110b, (IntPtr) 8L, node.Handle);
}
else
{
TVITEM pitem = new TVITEM {
hItem = node.Handle,
mask = TVIF.TVIF_HANDLE | TVIF.TVIF_STATE,
state = value ? TVIS.TVIS_DROPHILITED : ((TVIS) 0),
stateMask = TVIS.TVIS_DROPHILITED
};
CommCtrl.TreeView_SetItem(node.TreeView.Handle, ref pitem);
}
}
public static bool GetDropHilited(this TreeNode node)
{
if (node == null)
{
throw new ArgumentNullException();
}
if (!((node.TreeView != null) && node.TreeView.IsHandleCreated))
{
return false;
}
TVITEM pitem = new TVITEM {
hItem = node.Handle,
mask = TVIF.TVIF_HANDLE | TVIF.TVIF_STATE,
stateMask = TVIS.TVIS_DROPHILITED
};
CommCtrl.TreeView_GetItem(node.TreeView.Handle, ref pitem);
return ((pitem.state & TVIS.TVIS_DROPHILITED) > ((TVIS) 0));
}
private void HideCheckBox(TreeNode node)
{
TVITEM tvi = new TVITEM();
tvi.hItem = node.Handle;
tvi.mask = TVIF_STATE;
tvi.stateMask = TVIS_STATEIMAGEMASK;
tvi.state = 0;
IntPtr lparam = Marshal.AllocHGlobal(Marshal.SizeOf(tvi));
Marshal.StructureToPtr(tvi, lparam, false);
SendMessage(this.file_list.Handle, TVM_SETITEM, IntPtr.Zero, lparam);
}
public static void TreeView_SetItem(IntPtr hwndTV, ref TVITEM pitem)
{
SendMessage(hwndTV, TreeView_GetUnicodeFormat(hwndTV) ? 0x113f : 0x110d, IntPtr.Zero, ref pitem);
}
private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, ref TVITEM lParam);
public static void SetHasChildren(this TreeNode node, bool value)
{
if (node == null)
{
throw new ArgumentNullException();
}
if (!((node.TreeView != null) && node.TreeView.IsHandleCreated))
{
throw new InvalidOperationException();
}
TVITEM pitem = new TVITEM {
hItem = node.Handle,
mask = TVIF.TVIF_CHILDREN | TVIF.TVIF_HANDLE,
cChildren = value ? 1 : 0
};
CommCtrl.TreeView_SetItem(node.TreeView.Handle, ref pitem);
}
