Laurent Tourte
88 lines
1.8 KiB
GDScript
88 lines
1.8 KiB
GDScript
extends Node
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class_name StateMachine
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signal state_changed(state_path, msg)
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@export_node_path(Node) var initial_state_path: NodePath
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var state: State = null
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var current_msg: = {}
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var previous_state: State = null
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var previous_msg: = {}
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var _is_active: = false
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var is_active: = false:
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get: return _get_is_active()
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set(value): _set_is_active(value)
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func _ready() -> void:
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self.is_active = false
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var children: = get_children()
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for node in children:
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children.append_array(node.get_children())
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if node is State:
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node.state_machine = self
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func start() -> void:
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go_to_state(initial_state_path)
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self.is_active = true
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func _process(delta: float) -> void:
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if state:
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state.state_process(delta)
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func _physics_process(delta: float) -> void:
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if state:
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state.state_physics_process(delta)
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func _unhandled_input(event: InputEvent) -> void:
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if state:
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state.state_unhandled_input(event)
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func go_to_state(state_path: String, msg:= {}):
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var new_state: State = null
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if state_path == "Previous":
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if previous_state == null:
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push_error("No previous state at this point")
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return
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new_state = previous_state
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for key in previous_msg.keys():
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if not msg.has(key):
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msg[key] = previous_msg[key]
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else:
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if not has_node(state_path):
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push_error("State not found :" + state_path)
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return
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new_state = get_node(state_path)
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if state and state.can_be_previous:
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previous_msg = current_msg
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previous_state = state
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if state:
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state.exit_state()
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self.state = new_state
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state.enter_state(msg)
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current_msg = msg
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emit_signal("state_changed", state_path, msg)
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func _set_is_active(value: bool) -> void:
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_is_active = value
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set_process(value)
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set_physics_process(value)
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set_process_unhandled_input(value)
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func _get_is_active() -> bool:
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return _is_active
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