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# frozen_string_literal: true
module FelECS
class Scenes
# Allows overwriting the storage of systems, such as for clearing.
# This method should generally only need to be used internally and
# not by a game developer/
# @!visibility private
attr_writer :systems
# How early this Scene should be executed in a list of Scenes
attr_accessor :priority
def priority=(priority)
@priority = priority
FelECS::Stage.scenes = FelECS::Stage.scenes.sort_by(&:priority)
priority
end
# Create a new Scene using the name given
# @param name [String] String format must follow requirements of a constant
def initialize(name, priority: 0)
self.priority = priority
FelECS::Scenes.const_set(name, self)
end
# The list of Systems this Scene contains
# @return [Array<System>]
def systems
@systems ||= []
end
# Execute all systems in this Scene, in the order of their priority
# @return [Boolean] +true+
def call
systems.each(&:call)
true
end
# Adds any number of Systems to this Scene
# @return [Boolean] +true+
def add(*systems_to_add)
self.systems |= systems_to_add
self.systems = systems.sort_by(&:priority)
systems_to_add.each do |system|
system.scenes |= [self]
end
true
end
# Removes any number of Systems from this Scene
# @return [Boolean] +true+
def remove(*systems_to_remove)
self.systems -= systems_to_remove
true
end
# Removes all Systems from this Scene
# @return [Boolean] +true+
def clear
systems.each do |system|
system.scenes.delete self
end
systems.clear
# FelECS::Stage.update_systems_list if FelECS::Stage.scenes.include? self
true
end
end
end
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