86 lines
3.1 KiB
Swift
86 lines
3.1 KiB
Swift
// Copyright 2018-2021 Tokamak contributors
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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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// Created by Carson Katri on 7/19/20.
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//
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import OpenCombineShim
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// This is very similar to `MountedCompositeView`. However, the `mountedBody`
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// is the computed content of the specified `Scene`, instead of having child
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// `View`s
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final class MountedApp<R: Renderer>: MountedCompositeElement<R> {
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override func mount(
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before sibling: R.TargetType? = nil,
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on parent: MountedElement<R>? = nil,
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in reconciler: StackReconciler<R>,
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with transaction: Transaction
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) {
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super.prepareForMount(with: transaction)
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// `App` elements have no siblings, hence the `before` argument is discarded.
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// They also have no parents, so the `parent` argument is discarded as well.
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let childBody = reconciler.render(mountedApp: self)
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let child: MountedElement<R> = mountChild(reconciler.renderer, childBody)
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mountedChildren = [child]
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child.transaction = transaction
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child.mount(before: nil, on: self, in: reconciler, with: transaction)
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super.mount(before: sibling, on: parent, in: reconciler, with: transaction)
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}
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override func unmount(
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in reconciler: StackReconciler<R>,
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with transaction: Transaction,
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parentTask: UnmountTask<R>?
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) {
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super.unmount(in: reconciler, with: transaction, parentTask: parentTask)
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mountedChildren
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.forEach { $0.unmount(in: reconciler, with: transaction, parentTask: parentTask) }
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}
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/// Mounts a child scene within the app.
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/// - Parameters:
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/// - renderer: An instance conforming to the `Renderer` protocol to render the mounted
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/// scene with.
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/// - childBody: The body of the child scene to mount for this app.
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/// - Returns: Returns an instance of the `MountedScene` class that's already mounted in this app.
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private func mountChild(_ renderer: R, _ childBody: _AnyScene) -> MountedScene<R> {
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let mountedScene: MountedScene<R> = childBody
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.makeMountedScene(renderer, parentTarget, environmentValues, self)
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if let title = mountedScene.title {
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// swiftlint:disable force_cast
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(app.type as! _TitledApp.Type)._setTitle(title)
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}
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return mountedScene
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}
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override func update(in reconciler: StackReconciler<R>, with transaction: Transaction) {
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let element = reconciler.render(mountedApp: self)
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reconciler.reconcile(
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self,
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with: element,
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transaction: transaction,
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getElementType: { $0.type },
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updateChild: {
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$0.environmentValues = environmentValues
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$0.scene = _AnyScene(element)
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$0.transaction = transaction
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},
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mountChild: { mountChild(reconciler.renderer, $0) }
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)
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}
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}
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