private void SetCollapsableState()
{
if (Environment.OSVersion.Version.Major < 6)
return;
foreach (ListViewGroup group in Groups)
{
var placeHolderGroup = new NthListViewGroup();
placeHolderGroup.CbSize = Marshal.SizeOf(placeHolderGroup);
placeHolderGroup.State = _areGroupsCollapsable ? NthListViewGroupState.Collapsible : NthListViewGroupState.Normal;
placeHolderGroup.Mask = NthListViewGroupMask.State;
placeHolderGroup.GroupId = GetGroupId(group);
if (placeHolderGroup.GroupId < 0)
continue;
NativeMethods.SendMessage(Handle, (int)LVM.LVM_SETGROUPINFO, new IntPtr(placeHolderGroup.GroupId), ref placeHolderGroup);
// TODO: Verify if the object is directly handled over by reference or just copied
}
}
internal static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wParam, ref NthListViewGroup lParam);
