76 lines
2.1 KiB
Swift
76 lines
2.1 KiB
Swift
// Copyright 2020 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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@_spi(TokamakCore)
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import TokamakCore
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public protocol DOMViewModifier {
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var attributes: [HTMLAttribute: String] { get }
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/// Can the modifier be flattened?
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var isOrderDependent: Bool { get }
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}
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public extension DOMViewModifier {
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var isOrderDependent: Bool { false }
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}
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extension ModifiedContent: DOMViewModifier
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where Content: DOMViewModifier, Modifier: DOMViewModifier
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{
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// Merge attributes
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public var attributes: [HTMLAttribute: String] {
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var attr = content.attributes
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for (key, val) in modifier.attributes {
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if let prev = attr[key] {
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attr[key] = prev + val
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}
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}
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return attr
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}
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}
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extension _ZIndexModifier: DOMViewModifier {
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public var attributes: [HTMLAttribute: String] {
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["style": "z-index: \(index);"]
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}
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}
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@_spi(TokamakStaticHTML)
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public protocol HTMLModifierConvertible {
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func primitiveVisitor<V, Content: View>(
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content: Content,
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useDynamicLayout: Bool
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) -> ((V) -> ())? where V: ViewVisitor
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}
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@_spi(TokamakStaticHTML)
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extension ModifiedContent: HTMLConvertible where Content: View,
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Modifier: HTMLConvertible
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{
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public var tag: String { modifier.tag }
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public func attributes(useDynamicLayout: Bool) -> [HTMLAttribute: String] {
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modifier.attributes(useDynamicLayout: useDynamicLayout)
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}
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public var innerHTML: String? { modifier.innerHTML }
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public func primitiveVisitor<V>(useDynamicLayout: Bool) -> ((V) -> ())? where V: ViewVisitor {
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(modifier as? HTMLModifierConvertible)?
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.primitiveVisitor(
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content: content,
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useDynamicLayout: useDynamicLayout
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)
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}
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}
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