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PhotosGridViewDraggableX
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| // | |
| // ContentView.swift | |
| // TestDrag | |
| // | |
| // Created by Franklin Byaruhanga on 23/09/2023. | |
| // | |
| import SwiftUI | |
| struct ColorItemView: View { | |
| let url: URL | |
| let cellSize: CGSize | |
| var body: some View { | |
| AsyncImage(url: url) { phase in | |
| switch phase { | |
| case .success(let image): | |
| image | |
| .resizable() | |
| .scaledToFill() | |
| default: | |
| ProgressView() | |
| } | |
| } | |
| .cornerRadius(15) | |
| .frame(width: cellSize.width, height: cellSize.height) | |
| .clipped() | |
| } | |
| } | |
| struct DropViewDelegate: DropDelegate { | |
| let destinationItem: URL | |
| @Binding var colors: [URL] | |
| @Binding var draggedItem: URL? | |
| @Binding var lastUpdated: Date? // this is new! | |
| @Binding var isDrop: Bool | |
| func dropExited(info: DropInfo) { | |
| self.isDrop = false | |
| } | |
| func dropUpdated(info: DropInfo) -> DropProposal? { | |
| DropProposal(operation: .move) | |
| } | |
| func performDrop(info: DropInfo) -> Bool { | |
| draggedItem = nil | |
| return true | |
| } | |
| func dropEntered(info: DropInfo) { | |
| self.isDrop = true | |
| // Swap Items | |
| if let draggedItem { | |
| let fromIndex = colors.firstIndex(of: draggedItem) | |
| if let fromIndex { | |
| let toIndex = colors.firstIndex(of: destinationItem) | |
| if let toIndex, fromIndex != toIndex { | |
| let now: Date = .now | |
| if (lastUpdated == nil || now.timeIntervalSince(lastUpdated!) > 0.2) { | |
| lastUpdated = .now | |
| withAnimation { | |
| self.colors.move(fromOffsets: IndexSet(integer: fromIndex), toOffset: (toIndex > fromIndex ? (toIndex + 1) : toIndex)) | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } | |
| } | |
| struct PhotosGridViewDraggableX: View { | |
| @State private var draggedColor: URL? | |
| @State var colors: [URL] = [ | |
| URL(string: "https://picsum.photos/id/1/500/500")!, | |
| URL(string: "https://picsum.photos/id/20/500/500")!, | |
| URL(string: "https://picsum.photos/id/50/500/500")!, | |
| URL(string: "https://picsum.photos/id/100/500/500")!, | |
| URL(string: "https://picsum.photos/id/67/500/500")!, | |
| URL(string: "https://picsum.photos/id/6/500/500")! | |
| ] | |
| @State private var lastUpdated: Date? // this is new! | |
| @State var isDrop: Bool = false | |
| var body: some View { | |
| GeometryReader { proxy in | |
| let hGap: CGFloat = 14 | |
| let width = proxy.size.width - (hGap * 2) | |
| let cellWidth = (width / 3) | |
| let cellSize = CGSize(width: cellWidth, height: cellWidth * 1.5) | |
| let columns = [GridItem(.fixed(cellWidth)), GridItem(.fixed(cellWidth)), GridItem(.fixed(cellWidth))] | |
| LazyVGrid(columns: columns) { | |
| ForEach(colors, id: \.self) { color in | |
| ColorItemView(url: color, cellSize: cellSize) | |
| .overlay( | |
| (isDrop && (color == draggedColor)) | |
| ? Rectangle().fill(.thinMaterial) | |
| : nil | |
| ) | |
| // .opacity( (isDrop && (color == draggedColor)) ? 0.01 : 1) | |
| .onDrag { | |
| self.draggedColor = color | |
| return NSItemProvider() | |
| } preview: { | |
| ColorItemView(url: color, cellSize: cellSize) | |
| .opacity(1) | |
| } | |
| .onDrop(of: [.text], | |
| delegate: DropViewDelegate(destinationItem: color, colors: $colors, draggedItem: $draggedColor, lastUpdated: $lastUpdated, isDrop: $isDrop) | |
| ) | |
| } | |
| } | |
| } | |
| } | |
| } | |
| #Preview { | |
| PhotosGridViewDraggableX() | |
| } |
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I used this:
this is the video see how the onDrag Preview does not always work
sample.mp4