53 lines
1.5 KiB
Swift
53 lines
1.5 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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import TokamakCore
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public protocol DOMViewModifier {
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var attributes: [String: 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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extension DOMViewModifier {
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public 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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// Merge attributes
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public var attributes: [String: 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: [String: String] {
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["style": "z-index: \(index);"]
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}
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}
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extension _BackgroundModifier: DOMViewModifier where Background == Color {
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public var isOrderDependent: Bool { true }
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public var attributes: [String: String] {
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["style": "background-color: \(background.cssValue(environment))"]
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}
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}
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