package Ġcom . my gdx . game . widgets Ċ Ċ import Ġcom . my gdx . game . widgets . Inventory Slot Observer . Slot Event Ċ Ċ interface ĠInventory Slot Subject Ġ{ ĊĠĠĠ Ġfun Ġadd Observer ( inventory Slot Observer : ĠInventory Slot Observer ) ĊĠĠĠ Ġfun Ġremove Observer ( inventory Slot Observer : ĠInventory Slot Observer ) ĊĠĠĠ Ġfun Ġremove All Observer s () ĊĠĠĠ Ġfun Ġnotify ( slot : ĠInventory Slot , Ġevent : ĠSlot Event ) Ċ }