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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| // | ||
| // CalculatedArray.swift | ||
| // AwfulBinding | ||
| // | ||
| // Created by Zachary Smith on 3/26/15. | ||
| // Copyright (c) 2015 Scal.io. All rights reserved. | ||
| // | ||
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| import Foundation | ||
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| public extension BindableArray{ | ||
| public func transform<ValueType>(calculator:([PUpdateable]) -> [ValueType]) -> CalculatedArray<ValueType>{ | ||
| return CalculatedArray(boundValues: [self], calculator: calculator) | ||
| } | ||
| } | ||
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| public class CalculatedArray<ValueType>:BindableArray<ValueType>{ | ||
| private let _listenerOwner:NSObject = NSObject() | ||
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| private func calculateValue(){ | ||
| self.internalArray = calculator(_boundValues) | ||
| } | ||
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| public var calculator:([PUpdateable]) -> [ValueType] | ||
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| private var _boundValues:[PUpdateable] | ||
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| //TODO: fine-tune updates for PBindableCollections | ||
| public init(boundValues:[PUpdateable], calculator:([PUpdateable]) -> [ValueType]){ | ||
| _boundValues = boundValues | ||
| self.calculator = calculator | ||
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| super.init(internalArray:calculator(boundValues)) | ||
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| for boundValue in boundValues{ | ||
| boundValue.addAnyUpdateListener(_listenerOwner, listener: boundValueUpdated, alertNow: false) | ||
| } | ||
| } | ||
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| deinit{ | ||
| for boundValue in _boundValues{ | ||
| boundValue.removeAnyUpdateListener(_listenerOwner) | ||
| } | ||
| } | ||
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| private func boundValueUpdated(){ | ||
| calculateValue() | ||
| } | ||
| } |