Forum:Gain Spell Counters

I'm just trying to make it clear, are the effects of Royal Magical Library, Skilled Dark Magician, etc, in regards to their effects that gain spell counters when a spell card is played, is that a continuous or trigger effect?

Also with other cards such as Maiden of Macabre and Silent Magician LV4 that gain spell counters each time something happens, are they consider continuous or trigger effect?