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Add LayoutManager #66
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| import MondrianLayout | ||
| import StorybookKit | ||
| import UIKit | ||
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| var _book_layoutManager: BookView { | ||
| BookNavigationLink(title: "LayoutManager") { | ||
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| let manager = LayoutManager() | ||
| var counter = 0 | ||
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| BookPreview { | ||
| ExampleView(width: 200, height: 200) { view in | ||
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| let box1 = UIView.mock(backgroundColor: .neon(.cyan)) | ||
| let box2 = UIView.mock(backgroundColor: .neon(.cyan)) | ||
| let box3 = UIView.mock(backgroundColor: .neon(.cyan)) | ||
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| manager.setup(on: view) { | ||
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| if counter % 2 == 0 { | ||
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| VStackBlock { | ||
| box1 | ||
| .viewBlock | ||
| .size(.smallSquare) | ||
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| box2 | ||
| .viewBlock | ||
| .size(.smallSquare) | ||
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| box3 | ||
| .viewBlock | ||
| .size(.smallSquare) | ||
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| StackingSpacer(minLength: 0) | ||
| } | ||
| } else { | ||
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| HStackBlock { | ||
| box1 | ||
| .viewBlock | ||
| .size(.largeSquare) | ||
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| box2 | ||
| .viewBlock | ||
| .size(.largeSquare) | ||
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| box3 | ||
| .viewBlock | ||
| .size(.largeSquare) | ||
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| StackingSpacer(minLength: 0) | ||
| } | ||
| } | ||
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| } | ||
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| } | ||
| } | ||
| .addButton( | ||
| "Update", | ||
| handler: { view in | ||
| counter += 1 | ||
| manager.reloadLayout() | ||
| } | ||
| ) | ||
| .addButton( | ||
| "Update Animated", | ||
| handler: { view in | ||
| counter += 1 | ||
| UIViewPropertyAnimator(duration: 1.2, dampingRatio: 0.9) { | ||
| manager.reloadLayout() | ||
| view.layoutIfNeeded() | ||
| } | ||
| .startAnimation() | ||
| } | ||
| ) | ||
| .title("LayoutManager") | ||
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| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
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| import UIKit | ||
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| /** | ||
| An object that manages layout. | ||
| It supports updating the layout. | ||
| In the case of defining distinct layouts under some conditions, this helps. | ||
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| ```swift | ||
| /// Defines a instance | ||
| /// It needs to be retained somewhere such as inside view controller or view. | ||
| let manager = LayoutManager() | ||
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| /// Sets up the layout in the escaping closure | ||
| manager.setup(on: view) { | ||
| VStackBlock { | ||
| ... | ||
| } | ||
| } | ||
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| /// Calls when you need to get a new layout. | ||
| /// It calls the closure set in `setup` to build subviews again. | ||
| manager.reloadLayout() | ||
| ``` | ||
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| */ | ||
| public final class LayoutManager { | ||
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| private var _layoutBuilder: (() -> [EntrypointBuilder.Either])? | ||
| private var currentContext: LayoutBuilderContext? | ||
| private weak var targetView: UIView? | ||
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| public init() { | ||
| } | ||
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| /** | ||
| Setting up the layout of subviews on the view. | ||
| the layout closure is called each calling `reloadLayout` and after `setup`. | ||
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| Please avoid creating view and layout-guide instances in the closure. Performance decreases by creating a new instance and destroying the previous one. | ||
| */ | ||
| public func setup( | ||
| on view: UIView, | ||
| @EntrypointBuilder layout: @escaping () -> [EntrypointBuilder.Either] | ||
| ) { | ||
| targetView = view | ||
| _layoutBuilder = layout | ||
| reloadLayout() | ||
| } | ||
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| /** | ||
| Re lays out the subviews with deactivating the current layout. | ||
| */ | ||
| public func reloadLayout() { | ||
| guard let _layoutBuilder = _layoutBuilder else { | ||
| return | ||
| } | ||
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| guard let targetView = targetView else { | ||
| return | ||
| } | ||
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| let previousContext = currentContext | ||
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| previousContext?.deactivate() | ||
| let newContext = targetView.mondrian.buildSubviews(_layoutBuilder) | ||
| currentContext = newContext | ||
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| } | ||
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| } |
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