Definitely positive moods for me can be a trigger as well. Not that I have had one of those in a while! I don't mean to be an AA big book basher, as I don't attend any more. However, in the 'Big Book' there is a sentence that describes this perfectly...
'We drank to dream still greater dreams'
Essentially when feeling good about something, we drink to amplify that good mood even more.
I hope that I have finally learned that this does not work, and with drink my good mood becomes sour, and I quickly become dangerously angry. Perhaps the only way to avoid drinking when we feel confident, happy, successful etc, is to bring into our mind our last disastrous alcoholic mess with as much clarity as possible. I need to close my eyes and feel, taste, smell, see and touch the prison cell, the DT's, the hunger and the chaos. After a couple of minutes the urge 'to dream still greater dreams' recedes. And sanity returns.