99 lines
2.8 KiB
Swift
99 lines
2.8 KiB
Swift
// Copyright 2020-2021 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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import Foundation
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public struct _FlexFrameLayout: ViewModifier {
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public let minWidth: CGFloat?
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public let idealWidth: CGFloat?
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public let maxWidth: CGFloat?
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public let minHeight: CGFloat?
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public let idealHeight: CGFloat?
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public let maxHeight: CGFloat?
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public let alignment: Alignment
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// These are special cases in SwiftUI, where the child
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// will request the entire width/height of the parent.
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public var fillWidth: Bool {
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(minWidth == 0 || minWidth == nil) && maxWidth == .infinity
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}
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public var fillHeight: Bool {
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(minHeight == 0 || minHeight == nil) && maxHeight == .infinity
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}
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init(
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minWidth: CGFloat? = nil,
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idealWidth: CGFloat? = nil,
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maxWidth: CGFloat? = nil,
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minHeight: CGFloat? = nil,
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idealHeight: CGFloat? = nil,
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maxHeight: CGFloat? = nil,
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alignment: Alignment
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) {
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self.minWidth = minWidth
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self.idealWidth = idealWidth
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self.maxWidth = maxWidth
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self.minHeight = minHeight
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self.idealHeight = idealHeight
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self.maxHeight = maxHeight
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self.alignment = alignment
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}
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public func body(content: Content) -> some View {
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content
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}
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}
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extension _FlexFrameLayout: Animatable {
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public typealias AnimatableData = EmptyAnimatableData
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}
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public extension View {
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func frame(
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minWidth: CGFloat? = nil,
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idealWidth: CGFloat? = nil,
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maxWidth: CGFloat? = nil,
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minHeight: CGFloat? = nil,
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idealHeight: CGFloat? = nil,
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maxHeight: CGFloat? = nil,
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alignment: Alignment = .center
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) -> some View {
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func areInNondecreasingOrder(
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_ min: CGFloat?, _ ideal: CGFloat?, _ max: CGFloat?
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) -> Bool {
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let min = min ?? -.infinity
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let ideal = ideal ?? min
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let max = max ?? ideal
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return min <= ideal && ideal <= max
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}
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if !areInNondecreasingOrder(minWidth, idealWidth, maxWidth) ||
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!areInNondecreasingOrder(minHeight, idealHeight, maxHeight)
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{
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fatalError("Contradictory frame constraints specified.")
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}
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return modifier(
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_FlexFrameLayout(
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minWidth: minWidth,
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idealWidth: idealWidth, maxWidth: maxWidth,
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minHeight: minHeight,
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idealHeight: idealHeight, maxHeight: maxHeight,
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alignment: alignment
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)
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)
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}
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}
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