36 lines
1.3 KiB
Swift
36 lines
1.3 KiB
Swift
//
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// Copyright 2022 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import Foundation
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/// Represents a specific portion of the ViewState that can be bound to with SwiftUI's [2-way binding](https://developer.apple.com/documentation/swiftui/binding).
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protocol BindableState {
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/// The associated type of the Bindable State. Defaults to Void.
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associatedtype BindStateType = Void
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var bindings: BindStateType { get set }
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}
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extension BindableState where BindStateType == Void {
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/// We provide a default implementation for the Void type so that we can have `ViewState` that
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/// just doesn't include/take advantage of the bindings.
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var bindings: Void {
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get { }
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set {
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fatalError("Can't bind to the default Void binding.")
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}
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}
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}
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