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Merge pull request #34 from LiYanan2004/visionOS
Adds visionOS support
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184 changes: 184 additions & 0 deletions
184
Sources/MarkdownView/Helper/SwiftUI+OnChangeModifier.swift
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,184 @@ | ||
| import SwiftUI | ||
|
|
||
| extension View { | ||
|
|
||
| /// Adds a modifier for this view that fires an action when a specific | ||
| /// value changes. | ||
| /// | ||
| /// You can use `onChange` to trigger a side effect as the result of a | ||
| /// value changing, such as an `Environment` key or a `Binding`. | ||
| /// | ||
| /// The system may call the action closure on the main actor, so avoid | ||
| /// long-running tasks in the closure. If you need to perform such tasks, | ||
| /// detach an asynchronous background task. | ||
| /// | ||
| /// When the value changes, the new version of the closure will be called, | ||
| /// so any captured values will have their values from the time that the | ||
| /// observed value has its new value. The old and new observed values are | ||
| /// passed into the closure. In the following code example, `PlayerView` | ||
| /// passes both the old and new values to the model. | ||
| /// | ||
| /// struct PlayerView: View { | ||
| /// var episode: Episode | ||
| /// @State private var playState: PlayState = .paused | ||
| /// | ||
| /// var body: some View { | ||
| /// VStack { | ||
| /// Text(episode.title) | ||
| /// Text(episode.showTitle) | ||
| /// PlayButton(playState: $playState) | ||
| /// } | ||
| /// .onChange(of: playState) { oldState, newState in | ||
| /// model.playStateDidChange(from: oldState, to: newState) | ||
| /// } | ||
| /// } | ||
| /// } | ||
| /// | ||
| /// - Parameters: | ||
| /// - value: The value to check against when determining whether | ||
| /// to run the closure. | ||
| /// - initial: Whether the action should be run when this view initially | ||
| /// appears. | ||
| /// - action: A closure to run when the value changes. | ||
| /// - oldValue: The old value that failed the comparison check (or the | ||
| /// initial value when requested). | ||
| /// - newValue: The new value that failed the comparison check. | ||
| /// | ||
| /// - Returns: A view that fires an action when the specified value changes. | ||
| @_disfavoredOverload | ||
| @available(iOS, introduced: 14.0, deprecated: 17.0) | ||
| @available(macOS, introduced: 11.0, deprecated: 14.0) | ||
| @available(tvOS, introduced: 14.0, deprecated: 17.0) | ||
| @available(watchOS, introduced: 7.0, deprecated: 10.0) | ||
| @available(visionOS, unavailable) | ||
| public func onChange<E: Equatable>( | ||
| of value: E, | ||
| initial: Bool = false, | ||
| _ action: @escaping (_ oldValue: E, _ newValue: E) -> Void | ||
| ) -> some View { | ||
| modifier( | ||
| OnChangeModifier( | ||
| value: value, | ||
| initial: initial, | ||
| action: .init(action) | ||
| ) | ||
| ) | ||
| } | ||
|
|
||
| /// Adds a modifier for this view that fires an action when a specific | ||
| /// value changes. | ||
| /// | ||
| /// You can use `onChange` to trigger a side effect as the result of a | ||
| /// value changing, such as an `Environment` key or a `Binding`. | ||
| /// | ||
| /// The system may call the action closure on the main actor, so avoid | ||
| /// long-running tasks in the closure. If you need to perform such tasks, | ||
| /// detach an asynchronous background task. | ||
| /// | ||
| /// When the value changes, the new version of the closure will be called, | ||
| /// so any captured values will have their values from the time that the | ||
| /// observed value has its new value. In the following code example, | ||
| /// `PlayerView` calls into its model when `playState` changes model. | ||
| /// | ||
| /// struct PlayerView: View { | ||
| /// var episode: Episode | ||
| /// @State private var playState: PlayState = .paused | ||
| /// | ||
| /// var body: some View { | ||
| /// VStack { | ||
| /// Text(episode.title) | ||
| /// Text(episode.showTitle) | ||
| /// PlayButton(playState: $playState) | ||
| /// } | ||
| /// .onChange(of: playState) { | ||
| /// model.playStateDidChange(state: playState) | ||
| /// } | ||
| /// } | ||
| /// } | ||
| /// | ||
| /// - Parameters: | ||
| /// - value: The value to check against when determining whether | ||
| /// to run the closure. | ||
| /// - initial: Whether the action should be run when this view initially | ||
| /// appears. | ||
| /// - action: A closure to run when the value changes. | ||
| /// | ||
| /// - Returns: A view that fires an action when the specified value changes. | ||
| @_disfavoredOverload | ||
| @available(iOS, introduced: 14.0, deprecated: 17.0) | ||
| @available(macOS, introduced: 11.0, deprecated: 14.0) | ||
| @available(tvOS, introduced: 14.0, deprecated: 17.0) | ||
| @available(watchOS, introduced: 7.0, deprecated: 10.0) | ||
| @available(visionOS, unavailable) | ||
| public func onChange<E: Equatable>( | ||
| of value: E, | ||
| initial: Bool = false, | ||
| _ action: @escaping () -> Void | ||
| ) -> some View { | ||
| modifier( | ||
| OnChangeModifier( | ||
| value: value, | ||
| initial: initial, | ||
| action: .init(action) | ||
| ) | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| @available(iOS, introduced: 14.0, deprecated: 17.0) | ||
| @available(macOS, introduced: 11.0, deprecated: 14.0) | ||
| @available(tvOS, introduced: 14.0, deprecated: 17.0) | ||
| @available(watchOS, introduced: 7.0, deprecated: 10.0) | ||
| @available(visionOS, unavailable) | ||
| struct OnChangeModifier<E: Equatable>: ViewModifier { | ||
| var value: E | ||
| var initial: Bool | ||
|
|
||
| struct ActionPack { | ||
| var actionWithValues: ((E, E) -> Void)? | ||
| var simpleAction: (() -> Void)? | ||
|
|
||
| func callAsFunction(before: E, after: E) { | ||
| if let actionWithValues { | ||
| actionWithValues(before, after) | ||
| } else if let simpleAction { | ||
| simpleAction() | ||
| } | ||
| } | ||
|
|
||
| init(_ action: @escaping (E, E) -> Void) { | ||
| self.actionWithValues = action | ||
| self.simpleAction = nil | ||
| } | ||
|
|
||
| init(_ action: @escaping () -> Void) { | ||
| self.simpleAction = action | ||
| self.actionWithValues = nil | ||
| } | ||
| } | ||
| var action: ActionPack | ||
|
|
||
| func body(content: Content) -> some View { | ||
| if #available(macOS 14, iOS 17, tvOS 17, watchOS 10, *) { | ||
| content | ||
| .onChange( | ||
| of: value, | ||
| initial: initial, | ||
| action.callAsFunction(before:after:) | ||
| ) | ||
| } else { | ||
| content | ||
| .onAppear(perform: initialAction) | ||
| .onChange(of: value) { [value] newValue in | ||
| Task { @MainActor in | ||
| action(before: value, after: newValue) | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private func initialAction() { | ||
| guard initial else { return } | ||
| action(before: value, after: value) | ||
| } | ||
| } |
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