Modify Expert Advisor based on Heikin Ashi

I'm looking for someone to help me to modify this EA based on Heikin Ashi Candles.

What the EA does is open a trade when closing a Heiken Ashi candle, if it closes positive it will open a buy and if it closes negative it will open a sell.

In the next image you can see how the expert works right now.

But I need a new condition to be added to this expert, this condition is to change the way of opening and closing trades.
Instead of opening and closing a trade when a candle closes, the expert must open and close trades according to whether the candle changes to positive or negative, expert should not wait for the candle to close, if a candle changes to negative (red) should open a sell trade and close buy trade or if candle changes to positive (blue) should open a buy trade and close sell trade. This condition must be optional to activate or deactivate. The logic of this expert should not be changed.