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1 | 1 | #if canImport(SwiftUI)
|
2 |
| -import SwiftUI |
| 2 | + import SwiftUI |
3 | 3 |
|
4 |
| -/// A view that safely unwraps a store of optional state in order to show one of two views. |
5 |
| -/// |
6 |
| -/// When the underlying state is non-`nil`, the `then` closure will be performed with a ``Store`` |
7 |
| -/// that holds onto non-optional state, and otherwise the `else` closure will be performed. |
8 |
| -/// |
9 |
| -/// This is useful for deciding between two views to show depending on an optional piece of state: |
10 |
| -/// |
11 |
| -/// ```swift |
12 |
| -/// IfLetStore( |
13 |
| -/// store.scope(state: \SearchState.results, action: SearchAction.results), |
14 |
| -/// ) { |
15 |
| -/// SearchResultsView(store: $0) |
16 |
| -/// } else: { |
17 |
| -/// Text("Loading search results...") |
18 |
| -/// } |
19 |
| -/// ``` |
20 |
| -/// |
21 |
| -/// And for showing a sheet when a piece of state becomes non-`nil`: |
22 |
| -/// |
23 |
| -/// ```swift |
24 |
| -/// .sheet( |
25 |
| -/// isPresented: viewStore.binding( |
26 |
| -/// get: \.isGameActive, |
27 |
| -/// send: { $0 ? .startButtonTapped : .detailDismissed } |
28 |
| -/// ) |
29 |
| -/// ) { |
30 |
| -/// IfLetStore( |
31 |
| -/// self.store.scope(state: \.detail, action: AppAction.detail) |
32 |
| -/// ) { |
33 |
| -/// DetailView(store: $0) |
34 |
| -/// } |
35 |
| -/// } |
36 |
| -/// ``` |
37 |
| -/// |
| 4 | + /// A view that safely unwraps a store of optional state in order to show one of two views. |
| 5 | + /// |
| 6 | + /// When the underlying state is non-`nil`, the `then` closure will be performed with a ``Store`` |
| 7 | + /// that holds onto non-optional state, and otherwise the `else` closure will be performed. |
| 8 | + /// |
| 9 | + /// This is useful for deciding between two views to show depending on an optional piece of state: |
| 10 | + /// |
| 11 | + /// ```swift |
| 12 | + /// IfLetStore( |
| 13 | + /// store.scope(state: \SearchState.results, action: SearchAction.results), |
| 14 | + /// ) { |
| 15 | + /// SearchResultsView(store: $0) |
| 16 | + /// } else: { |
| 17 | + /// Text("Loading search results...") |
| 18 | + /// } |
| 19 | + /// ``` |
| 20 | + /// |
| 21 | + /// And for showing a sheet when a piece of state becomes non-`nil`: |
| 22 | + /// |
| 23 | + /// ```swift |
| 24 | + /// .sheet( |
| 25 | + /// isPresented: viewStore.binding( |
| 26 | + /// get: \.isGameActive, |
| 27 | + /// send: { $0 ? .startButtonTapped : .detailDismissed } |
| 28 | + /// ) |
| 29 | + /// ) { |
| 30 | + /// IfLetStore( |
| 31 | + /// self.store.scope(state: \.detail, action: AppAction.detail) |
| 32 | + /// ) { |
| 33 | + /// DetailView(store: $0) |
| 34 | + /// } |
| 35 | + /// } |
| 36 | + /// ``` |
| 37 | + /// |
38 | 38 | public struct IfLetStore<State, Action, Content>: View where Content: View {
|
39 |
| - private let content: (ViewStore<State?, Action>) -> Content |
40 |
| - private let store: Store<State?, Action> |
| 39 | + private let content: (ViewStore<State?, Action>) -> Content |
| 40 | + private let store: Store<State?, Action> |
41 | 41 |
|
42 |
| - /// Initializes an ``IfLetStore`` view that computes content depending on if a store of optional |
43 |
| - /// state is `nil` or non-`nil`. |
44 |
| - /// |
45 |
| - /// - Parameters: |
46 |
| - /// - store: A store of optional state. |
47 |
| - /// - ifContent: A function that is given a store of non-optional state and returns a view that |
48 |
| - /// is visible only when the optional state is non-`nil`. |
49 |
| - /// - elseContent: A view that is only visible when the optional state is `nil`. |
50 |
| - public init<IfContent, ElseContent>( |
51 |
| - _ store: Store<State?, Action>, |
52 |
| - @ViewBuilder then ifContent: @escaping (Store<State, Action>) -> IfContent, |
53 |
| - @ViewBuilder else elseContent: () -> ElseContent |
54 |
| - ) where Content == _ConditionalContent<IfContent, ElseContent> { |
55 |
| - self.store = store |
56 |
| - let elseContent = elseContent() |
57 |
| - self.content = { viewStore in |
58 |
| - if var state = viewStore.state { |
59 |
| - return ViewBuilder.buildEither( |
60 |
| - first: ifContent( |
| 42 | + /// Initializes an ``IfLetStore`` view that computes content depending on if a store of optional |
| 43 | + /// state is `nil` or non-`nil`. |
| 44 | + /// |
| 45 | + /// - Parameters: |
| 46 | + /// - store: A store of optional state. |
| 47 | + /// - ifContent: A function that is given a store of non-optional state and returns a view that |
| 48 | + /// is visible only when the optional state is non-`nil`. |
| 49 | + /// - elseContent: A view that is only visible when the optional state is `nil`. |
| 50 | + public init<IfContent, ElseContent>( |
| 51 | + _ store: Store<State?, Action>, |
| 52 | + @ViewBuilder then ifContent: @escaping (Store<State, Action>) -> IfContent, |
| 53 | + @ViewBuilder else elseContent: () -> ElseContent |
| 54 | + ) where Content == _ConditionalContent<IfContent, ElseContent> { |
| 55 | + self.store = store |
| 56 | + let elseContent = elseContent() |
| 57 | + self.content = { viewStore in |
| 58 | + if var state = viewStore.state { |
| 59 | + return ViewBuilder.buildEither( |
| 60 | + first: ifContent( |
| 61 | + store |
| 62 | + .filter { state, _ in state == nil ? !BindingLocal.isActive : true } |
| 63 | + .scope { |
| 64 | + state = $0 ?? state |
| 65 | + return state |
| 66 | + } |
| 67 | + ) |
| 68 | + ) |
| 69 | + } else { |
| 70 | + return ViewBuilder.buildEither(second: elseContent) |
| 71 | + } |
| 72 | + } |
| 73 | + } |
| 74 | + |
| 75 | + /// Initializes an ``IfLetStore`` view that computes content depending on if a store of optional |
| 76 | + /// state is `nil` or non-`nil`. |
| 77 | + /// |
| 78 | + /// - Parameters: |
| 79 | + /// - store: A store of optional state. |
| 80 | + /// - ifContent: A function that is given a store of non-optional state and returns a view that |
| 81 | + /// is visible only when the optional state is non-`nil`. |
| 82 | + public init<IfContent>( |
| 83 | + _ store: Store<State?, Action>, |
| 84 | + @ViewBuilder then ifContent: @escaping (Store<State, Action>) -> IfContent |
| 85 | + ) where Content == IfContent? { |
| 86 | + self.store = store |
| 87 | + self.content = { viewStore in |
| 88 | + if var state = viewStore.state { |
| 89 | + return ifContent( |
61 | 90 | store
|
62 | 91 | .filter { state, _ in state == nil ? !BindingLocal.isActive : true }
|
63 | 92 | .scope {
|
64 |
| - state = $0 ?? state |
65 |
| - return state |
66 |
| - } |
| 93 | + state = $0 ?? state |
| 94 | + return state |
| 95 | + } |
67 | 96 | )
|
68 |
| - ) |
69 |
| - } else { |
70 |
| - return ViewBuilder.buildEither(second: elseContent) |
| 97 | + } else { |
| 98 | + return nil |
| 99 | + } |
71 | 100 | }
|
72 | 101 | }
|
73 |
| - } |
74 | 102 |
|
75 |
| - /// Initializes an ``IfLetStore`` view that computes content depending on if a store of optional |
76 |
| - /// state is `nil` or non-`nil`. |
77 |
| - /// |
78 |
| - /// - Parameters: |
79 |
| - /// - store: A store of optional state. |
80 |
| - /// - ifContent: A function that is given a store of non-optional state and returns a view that |
81 |
| - /// is visible only when the optional state is non-`nil`. |
82 |
| - public init<IfContent>( |
83 |
| - _ store: Store<State?, Action>, |
84 |
| - @ViewBuilder then ifContent: @escaping (Store<State, Action>) -> IfContent |
85 |
| - ) where Content == IfContent? { |
86 |
| - self.store = store |
87 |
| - self.content = { viewStore in |
88 |
| - if var state = viewStore.state { |
89 |
| - return ifContent( |
90 |
| - store |
91 |
| - .filter { state, _ in state == nil ? !BindingLocal.isActive : true } |
92 |
| - .scope { |
93 |
| - state = $0 ?? state |
94 |
| - return state |
95 |
| - } |
96 |
| - ) |
97 |
| - } else { |
98 |
| - return nil |
99 |
| - } |
| 103 | + public var body: some View { |
| 104 | + WithViewStore( |
| 105 | + self.store, |
| 106 | + observe: { $0 }, |
| 107 | + removeDuplicates: { ($0 != nil) == ($1 != nil) }, |
| 108 | + content: self.content |
| 109 | + ) |
100 | 110 | }
|
101 | 111 | }
|
102 |
| - |
103 |
| - public var body: some View { |
104 |
| - WithViewStore( |
105 |
| - self.store, |
106 |
| - observe: { $0 }, |
107 |
| - removeDuplicates: { ($0 != nil) == ($1 != nil) }, |
108 |
| - content: self.content |
109 |
| - ) |
110 |
| - } |
111 |
| -} |
112 | 112 | #endif
|
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