// 13 december 2014

// damn winsock
static void doselect(struct table *t, intptr_t row, intptr_t column)
{
	RECT r, client;
	intptr_t oldrow;
	LONG height;

	oldrow = t->selectedRow;
	t->selectedRow = row;
	t->selectedColumn = column;

	// TODO scroll to ensure the full cell is visible

	// now redraw the old and new /rows/
	if (GetClientRect(t->hwnd, &client) == 0)
		panic("error getting Table client rect in doselect()");
	client.top += t->headerHeight;
	height = rowht(t);
	r.left = client.left;
	r.right = client.right;
	if (oldrow != -1 && oldrow >= t->vscrollpos) {
		r.top = client.top + ((oldrow - t->vscrollpos) * height);
		r.bottom = r.top + height;
		if (InvalidateRect(t->hwnd, &r, TRUE) == 0)
			panic("error queueing previously selected row for redraw in doselect()");
	}
	// t->selectedRow must be visible by this point; we scrolled to it
	if (t->selectedRow != -1 && t->selectedRow != oldrow) {
		r.top = client.top + ((t->selectedRow - t->vscrollpos) * height);
		r.bottom = r.top + height;
		if (InvalidateRect(t->hwnd, &r, TRUE) == 0)
			panic("error queueing newly selected row for redraw in doselect()");
	}
}

// TODO which WM_xBUTTONDOWNs?
HANDLER(mouseDownSelectHandler)
{
	struct rowcol rc;

	rc = lParamToRowColumn(t, lParam);
	// don't check if lParamToRowColumn() returned row -1 or column -1; we want deselection behavior
	doselect(t, rc.row, rc.column);
	*lResult = 0;
	return TRUE;
}