51 lines
1.3 KiB
GDScript
51 lines
1.3 KiB
GDScript
extends RdotNode
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class_name RdotStateInternal
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var equal: Callable = func(this, a, b): a == b
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var value: Variant = null
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static func createSignal(initialValue: Variant):
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var node = RdotStateInternal.new()
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node.value = initialValue
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var getter = func():
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RdotGraph.getInstance().producerAccessed(node)
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return node.value
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return [getter, node]
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static func setPostSignalSetFn(fn: Callable) -> Callable:
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var graph := RdotGraph.getInstance()
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var prev = graph.postSignalSetFn
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graph.postSignalSetFn = fn
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return prev
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static func signalGetFn(this: RdotStateInternal):
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RdotGraph.getInstance().producerAccessed(this)
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return this.value
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static func signalSetFn(node: RdotStateInternal, newValue: Variant):
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var graph := RdotGraph.getInstance()
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assert(graph.producerUpdatesAllowed())
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if !node.equal.call(node.wrapper, node.value, newValue):
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node.value = newValue
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signalValueChanged(node)
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static func signalUpdateFn(node: RdotStateInternal, updater: Callable):
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var graph := RdotGraph.getInstance()
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assert(graph.producerUpdatesAllowed())
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signalSetFn(node, updater.call(node.value))
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static func signalValueChanged(node: RdotStateInternal):
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var graph := RdotGraph.getInstance()
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node.version += 1
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graph.producerIncrementEpoch()
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graph.producerNotifyConsumers(node)
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if !graph.postSignalSetFn.is_null():
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graph.postSignalSetFn.call()
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