public override void Initialize()
{
_state = DragState.NotDragging;
_dropTargetInRangeShader = _prototypeManager.Index <ShaderPrototype>(ShaderDropTargetInRange).Instance();
_dropTargetOutOfRangeShader = _prototypeManager.Index <ShaderPrototype>(ShaderDropTargetOutOfRange).Instance();
_interactionSystem = EntitySystem.Get <SharedInteractionSystem>();
_inputSystem = EntitySystem.Get <InputSystem>();
// needs to fire on mouseup and mousedown so we can detect a drag / drop
CommandBinds.Builder
.Bind(EngineKeyFunctions.Use, new PointerInputCmdHandler(OnUse, false))
.Register <DragDropSystem>();
}
