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MountedCompositeView.swift
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MountedCompositeView.swift
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// Copyright 2018-2020 Tokamak contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Created by Max Desiatov on 03/12/2018.
//
import OpenCombine
import Runtime
final class MountedCompositeView<R: Renderer>: MountedCompositeElement<R> {
override func mount(with reconciler: StackReconciler<R>) {
let childBody = reconciler.render(compositeView: self)
if let appearanceAction = view.view as? AppearanceActionProtocol {
appearanceAction.appear?()
}
let child: MountedElement<R> = childBody.makeMountedView(parentTarget,
environmentValues)
mountedChildren = [child]
child.mount(with: reconciler)
}
override func unmount(with reconciler: StackReconciler<R>) {
mountedChildren.forEach { $0.unmount(with: reconciler) }
if let appearanceAction = view.view as? AppearanceActionProtocol {
appearanceAction.disappear?()
}
}
override func update(with reconciler: StackReconciler<R>) {
// FIXME: for now without properly handling `Group` mounted composite views have only
// a single element in `mountedChildren`, but this will change when
// fragments are implemented and this switch should be rewritten to compare
// all elements in `mountedChildren`
switch (mountedChildren.last, reconciler.render(compositeView: self)) {
// no mounted children, but children available now
case let (nil, childBody):
let child: MountedElement<R> = childBody.makeMountedView(parentTarget,
environmentValues)
mountedChildren = [child]
child.mount(with: reconciler)
// some mounted children
case let (wrapper?, childBody):
let childBodyType = (childBody as? AnyView)?.type ?? type(of: childBody)
// FIXME: no idea if using `mangledName` is reliable, but seems to be the only way to get
// a name of a type constructor in runtime. Should definitely check if these are different
// across modules, otherwise can cause problems with views with same names in different
// modules.
// new child has the same type as existing child
// swiftlint:disable:next force_try
if try! wrapper.view.typeConstructorName == typeInfo(of: childBodyType).mangledName {
wrapper.view = AnyView(childBody)
wrapper.update(with: reconciler)
} else {
// new child is of a different type, complete rerender, i.e. unmount the old
// wrapper, then mount a new one with the new `childBody`
wrapper.unmount(with: reconciler)
let child: MountedElement<R> = childBody.makeMountedView(parentTarget,
environmentValues)
mountedChildren = [child]
child.mount(with: reconciler)
}
}
}
}