mirror of
https://github.com/vector-im/element-ios.git
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104 lines
3.8 KiB
Swift
104 lines
3.8 KiB
Swift
//
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// Copyright 2021 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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/**
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Renders multiple chips in a flow layout.
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*/
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@available(iOS 14.0, *)
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struct Chips: View {
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@State private var totalHeight: CGFloat = 0
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var chips: [String]
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var didDeleteChip: (String) -> Void
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var verticalSpacing: CGFloat = 16
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var horizontalSpacing: CGFloat = 12
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var body: some View {
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Group {
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VStack {
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var x = CGFloat.zero
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var y = CGFloat.zero
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GeometryReader { geo in
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ZStack(alignment: .topLeading, content: {
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ForEach(chips, id: \.self) { chip in
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Chip(chip: chip) {
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didDeleteChip(chip)
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}
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.alignmentGuide(.leading) { dimension in
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// Align with leading side and move vertically down to next line
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// if chip does not fit on trailing side.
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if abs(x - dimension.width) > geo.size.width {
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x = 0
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y -= dimension.height + verticalSpacing
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}
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let result = x
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if chip == chips.last {
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// Reset x if it's the last.
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x = 0
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} else {
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// Align next chip to the end of the current one.
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x -= dimension.width + horizontalSpacing
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}
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return result
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}
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.alignmentGuide(.top) { dimension in
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// Use next y value and reset if its the last.
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let result = y
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if chip == chips.last {
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y = 0
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}
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return result
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}
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}
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})
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.background(viewHeightReader($totalHeight))
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}
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}
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.frame(height: totalHeight)
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}
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}
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/**
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As the flow layout uses a `ZStack` and alignmentGuides to overlay the chips we need to use
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Geometry to report back the calculated size
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*/
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private func viewHeightReader(_ binding: Binding<CGFloat>) -> some View {
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return GeometryReader { geo -> Color in
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DispatchQueue.main.async {
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binding.wrappedValue = geo.frame(in: .local).size.height
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}
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return .clear
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}
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}
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}
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@available(iOS 14.0, *)
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struct Chips_Previews: PreviewProvider {
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static var chips: [String] = ["Chip1", "Chip2", "Chip3", "Chip4", "Chip5", "Chip6"]
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static var previews: some View {
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Group {
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Chips(chips: chips, didDeleteChip: { _ in })
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Chips(chips: chips, didDeleteChip: { _ in })
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.theme(.dark)
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}
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}
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}
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