add basic state

classes/state/state.gd

@@ -0,0 +1,58 @@
+## Virtual base class for all states.
+## Extend this class and override its methods to implement a state.
+@abstract class_name State extends Node
+
+## Emitted when the state finishes and wants to transition to another state.
+@warning_ignore("unused_signal")
+signal finished(next_state_path: String, data: Dictionary)
+
+
+## For 'ghost frame' update fix
+var is_active: bool = false:
+	set(value):
+		is_active = value
+	get:
+		return is_active
+
+
+## Called by the state machine when receiving unhandled input events.
+@abstract func _handle_input(event: InputEvent) -> void
+
+## Called by the state machine on the engine's main loop tick.
+@abstract func _state_update(delta: float) -> void
+
+## Called by the state machine on the engine's physics update tick.
+@abstract func _state_physics_update(delta: float) -> void
+
+## Called by the state machine upon changing the active state. The `data` parameter
+## is a dictionary with arbitrary data the state can use to initialize itself.
+@abstract func _enter(previous_state_path: String, data: Dictionary = {}) -> void
+
+## Called by the state machine before changing the active state. Use this function
+## to clean up the state.
+@abstract func _exit() -> void
+
+
+func handle_input(event: InputEvent) -> void:
+	if not is_active: return
+	_handle_input(event)
+
+
+func state_update(delta: float) -> void:
+	if not is_active: return
+	_state_update(delta)
+
+
+func state_physics_update(delta: float) -> void:
+	if not is_active: return
+	_state_physics_update(delta)
+
+
+func enter(previous_state_path: String, data: Dictionary = {}) -> void:
+	is_active = true
+	_enter(previous_state_path, data)
+	
+
+func exit() -> void:
+	is_active = false
+	_exit()

classes/state/state.gd.uid

@@ -0,0 +1 @@
+uid://c204s7yw0rmoa