void TreeCtrl::DoClick(Point p, dword flags, bool down)
{
	Point org = sb;
	if(p.y + org.y > sb.GetTotal().cy)
		return;
	int i = FindLine(p.y + org.y);
	const Line& l = line[i];
	int x = levelcx + l.level * levelcx - org.x - (levelcx >> 1) /*- org.x*/;
	if(p.x > x - 6 && p.x < x + 6) {
		if(down)
			Open(l.itemi, !IsOpen(l.itemi));
	}
	else {
		if(down && IsSel(l.itemi)) {
			selclick = true;
			return;
		}
		SetFocus();
		int q = cursor;
		SetCursorLine(i, true, false, true);
		if(multiselect) {
			int id = GetCursor();
			if(flags & K_CTRL) {
				SelectOne(id, !IsSelected(id));
				anchor = cursor;
			}
			else
				if(flags & K_SHIFT)
					ShiftSelect(anchor < 0 ? cursor : anchor, cursor);
				else {
					if(selectcount) SelClear(0);
					SelectOne(id);
					anchor = cursor;
				}
		}
		if(cursor != q)
			WhenAction();
	}
}

void TreeCtrl::Open(int id, bool open)
{
	Item& m = item[id];
	if(m.isopen != open && (m.canopen || m.child.GetCount() || !open)) {
		m.isopen = open;
		int q = GetCursor();
		while(q >= 0) {
			q = GetParent(q);
			if(q == id) {
				SetCursor(id, true, true, true);
				break;
			}
		}
		Dirty(id);
		if(open)
			WhenOpen(id);
		else
			WhenClose(id);
	}
}

if(m.canopen || m.child.GetCount()) {
	Image im = m.isopen ? CtrlImg::treeminus() : CtrlImg::treeplus();
	op -= im.GetSize() / 2;
	w.DrawImage(op.x, op.y, im);

if(m.canopen) { // or possibly: && m.child.GetCount())
	Image im = m.isopen ? CtrlImg::treeminus() : CtrlImg::treeplus();
	op -= im.GetSize() / 2;
	w.DrawImage(op.x, op.y, im);

if(m.child.GetCount()) {
	Image im;
	if(m.canopen)
		im = m.isopen ? CtrlImg::treeminus() : CtrlImg::treeplus();
	else
		im = m.isopen ? CtrlImg::treeminusgrey() : CtrlImg::treeplusgrey();
	op -= im.GetSize() / 2;
	w.DrawImage(op.x, op.y, im);
}