[1.7.10] Item Left Click event

Hello every1,

I need to intercept the left click function of my item when hit a block type stone, but I can't seem to find an easy way to override it

The two functions I found from Item were:

this.onLeftClickEntity(stack, player, entity) //only occurs when you click an entity (the blocks seems not occurs)

this.onEntitySwing(entityLiving, stack) //apparently seems most appropiate but i dont know how verify when hit a block

thx