151 lines
3.1 KiB
GDScript
151 lines
3.1 KiB
GDScript
@tool
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class_name UndoRedoManager
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extends RefCounted
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signal history_breaked
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const MAX_CACHE : int = 10
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const MAX_STEP : int = 50
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var _cache : Array[CUndoRedo] = []
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var _current_index : int = 0
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var _break_history : bool = false
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var is_commited : bool = true
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func _init():
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clear_history()
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func break_history():
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_break_history = true
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func unbreak_history():
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_break_history = false
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func get_cache(index) -> CUndoRedo:
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for v in _cache:
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if v.index == _current_index:
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return v
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return null
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func get_index(current_index) -> int:
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for i in range(_cache.size()):
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if _cache[i].index == current_index:
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return i
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return -1
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func clear_history():
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_cache.clear()
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_cache.push_back(CUndoRedo.new())
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_current_index = _cache[0].index
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func undo():
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var cache = get_cache(_current_index)
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if cache.has_undo():
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cache.undo()
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else:
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var index = get_index(_current_index)
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if index > 0:
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_current_index = _cache[index - 1].index
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undo()
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func redo():
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var cache = get_cache(_current_index)
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if cache.has_redo():
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cache.redo()
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else:
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var index = get_index(_current_index)
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if index < _cache.size() - 1 and index != -1:
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_current_index = _cache[index + 1].index
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redo()
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func has_undo() -> bool:
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var c_index := _current_index
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while not get_cache(c_index).has_undo():
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var index = get_index(c_index)
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if index > 0:
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c_index = _cache[index - 1].index
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else:
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return false
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return true
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func has_redo() -> bool:
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var c_index := _current_index
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while not get_cache(c_index).has_redo():
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var index = get_index(c_index)
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if index < _cache.size() - 1 and index != -1:
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c_index = _cache[index + 1].index
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else:
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return false
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return true
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func create_action(name : String):
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if _break_history:
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clear_history()
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_break_history = false
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history_breaked.emit()
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var cache = get_cache(_current_index)
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var index = get_index(_current_index)
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var has_redo : bool = cache.has_redo()
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if has_redo:
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cache.clamp_redo_action = cache.get_current_action()
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if index < _cache.size() + 1:
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_cache = _cache.slice(0, index + 1)
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if cache.get_history_count() >= MAX_STEP or has_redo:
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_cache.push_back(CUndoRedo.new())
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if _cache.size() > MAX_CACHE:
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_cache.pop_front()
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_current_index = _cache[_cache.size() - 1].index
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cache = get_cache(_current_index)
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cache.create_action(name)
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is_commited = false
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func commit_action():
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get_cache(_current_index).commit_action(false)
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is_commited = true
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func add_undo_method(callable : Callable):
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get_cache(_current_index).add_undo_method(callable)
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func add_undo_property(object : Object, property : String, value : Variant):
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get_cache(_current_index).add_undo_property(object, property, value)
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func add_do_method(callable : Callable):
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get_cache(_current_index).add_do_method(callable)
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func add_do_property(object : Object, property : String, value):
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get_cache(_current_index).add_do_property(object, property, value)
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class CUndoRedo extends UndoRedo:
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var index : int = 0
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var clamp_redo_action : int = -1
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static var _index_counter = 0
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func _init():
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_index_counter += 1
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index = _index_counter
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func has_redo():
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return has_redo() and (get_current_action() < clamp_redo_action or clamp_redo_action == -1)
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