mirror of
https://github.com/Novaloop-AG/element-x-ios.git
synced 2026-11-07 21:08:28 +00:00
Stefan Ceriu
74 lines
3.5 KiB
Swift
74 lines
3.5 KiB
Swift
//
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// Copyright 2023 New Vector Ltd
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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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import SwiftUI
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/// A custom layout used for quotes and content when using the bubbles timeline style.
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///
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/// A custom layout is required as the embedded quote bubbles should fill the entire width of
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/// the message bubble, without causing the width of the bubble to fill all of the available space.
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struct TimelineBubbleLayout: Layout {
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/// The spacing between the components in the bubble.
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let spacing: CGFloat
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/// Layout priority constants for the bubble content. These priorities are abused within
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/// `TimelineBubbleLayout` to create the layout we would like. They aren't
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/// used in the expected way that SwiftUI would normally use layout priorities.
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enum Priority {
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/// The priority of hidden quote bubbles that are only used for layout calculations.
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static let hiddenQuote: Double = -1
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/// The priority of visible quote bubbles that are placed in the view with a full width.
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static let visibleQuote: Double = 0
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/// The priority of regular text that is used for layout calculations and placed in the view.
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static let regularText: Double = 1
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}
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func sizeThatFits(proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) -> CGSize {
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guard !subviews.isEmpty else { return .zero }
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// Calculate the natural size using the regular text and non-greedy quote bubbles.
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let layoutSubviews = subviews.filter { $0.priority != Priority.visibleQuote }
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let subviewSizes = layoutSubviews.map { $0.sizeThatFits(proposal) }
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let maxWidth = subviewSizes.map(\.width).reduce(0, max)
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let totalHeight = subviewSizes.map(\.height).reduce(0, +)
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let totalSpacing = CGFloat(layoutSubviews.count - 1) * spacing
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return CGSize(width: maxWidth, height: totalHeight + totalSpacing)
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}
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func placeSubviews(in bounds: CGRect, proposal: ProposedViewSize, subviews: Subviews, cache: inout ()) {
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guard !subviews.isEmpty else { return }
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// Calculate the width using the regular text and the non-greedy quote bubbles.
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let layoutSubviews = subviews.filter { $0.priority != Priority.visibleQuote }
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let maxWidth = layoutSubviews.map { $0.sizeThatFits(proposal).width }.reduce(0, max)
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// Place the regular text and greedy quote bubbles using the calculated width.
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let visibleSubviews = subviews.filter { $0.priority != Priority.hiddenQuote }
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let subviewSizes = visibleSubviews.map { $0.sizeThatFits(ProposedViewSize(width: maxWidth, height: proposal.height)) }
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var y = bounds.minY
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for index in visibleSubviews.indices {
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let height = subviewSizes[index].height
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visibleSubviews[index].place(at: CGPoint(x: bounds.minX, y: y),
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anchor: .topLeading,
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proposal: ProposedViewSize(width: maxWidth, height: height))
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y += height + spacing
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}
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}
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}
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