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Image Pinch Zooming

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Changelog-Added: Added pinch to zoom on images
This commit is contained in:
Swift
2023-01-18 10:07:03 -08:00
committed by William Casarin
parent fb1f99e728 aba758b143
commit 8ffa8446b6
7 changed files with 256 additions and 33 deletions
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128
damus/Components/ImageCarousel.swift
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@@ -64,9 +64,50 @@ struct ImageContextMenuModifier: ViewModifier {
}
}
struct ImageViewer: View {
struct ImageView: View {
let urls: [URL]
@Environment(\.presentationMode) var presentationMode
//let pubkey: String
//let profiles: Profiles
@GestureState private var scaleState: CGFloat = 1
@GestureState private var offsetState = CGSize.zero
@State private var offset = CGSize.zero
@State private var scale: CGFloat = 1
func resetStatus(){
self.offset = CGSize.zero
self.scale = 1
}
var zoomGesture: some Gesture {
MagnificationGesture()
.updating($scaleState) { currentState, gestureState, _ in
gestureState = currentState
}
.onEnded { value in
scale *= value
}
}
var dragGesture: some Gesture {
DragGesture()
.updating($offsetState) { currentState, gestureState, _ in
gestureState = currentState.translation
}.onEnded { value in
offset.height += value.translation.height
offset.width += value.translation.width
}
}
var doubleTapGesture : some Gesture {
TapGesture(count: 2).onEnded { value in
resetStatus()
}
}
private struct ImageHandler: ImageModifier {
@Binding var handler: UIImage?
@@ -86,30 +127,61 @@ struct ImageViewer: View {
}
var body: some View {
TabView {
ForEach(urls, id: \.absoluteString) { url in
VStack{
Text(url.lastPathComponent)
KFAnimatedImage(url)
.configure { view in
view.framePreloadCount = 3
}
.cacheOriginalImage()
.imageModifier(ImageHandler(handler: $image))
.loadDiskFileSynchronously()
.scaleFactor(UIScreen.main.scale)
.fade(duration: 0.1)
.aspectRatio(contentMode: .fit)
.tabItem {
Text(url.absoluteString)
}
.id(url.absoluteString)
.modifier(ImageContextMenuModifier(url: url, image: image, showShareSheet: $showShareSheet))
.sheet(isPresented: $showShareSheet) {
ShareSheet(activityItems: [url])
}
ZStack(alignment: .topLeading) {
Color("DamusDarkGrey") // Or Color("DamusBlack")
.edgesIgnoringSafeArea(.all)
HStack() {
Button {
presentationMode.wrappedValue.dismiss()
} label: {
Image(systemName: "xmark")
.foregroundColor(.white)
.font(.largeTitle)
.frame(width: 40, height: 40)
.padding(20)
}
}
.zIndex(1)
VStack(alignment: .center) {
//Spacer()
//.frame(height: 120)
TabView {
ForEach(urls, id: \.absoluteString) { url in
VStack{
//Color("DamusDarkGrey")
Text(url.lastPathComponent)
.foregroundColor(Color("DamusWhite"))
KFAnimatedImage(url)
.configure { view in
view.framePreloadCount = 3
}
.cacheOriginalImage()
.imageModifier(ImageHandler(handler: $image))
.loadDiskFileSynchronously()
.scaleFactor(UIScreen.main.scale)
.fade(duration: 0.1)
.aspectRatio(contentMode: .fit)
.tabItem {
Text(url.absoluteString)
}
.id(url.absoluteString)
.modifier(ImageContextMenuModifier(url: url, image: image, showShareSheet: $showShareSheet))
.sheet(isPresented: $showShareSheet) {
ShareSheet(activityItems: [url])
}
//.padding(100)
.scaledToFit()
.scaleEffect(self.scale * scaleState)
.offset(x: offset.width + offsetState.width, y: offset.height + offsetState.height)
.gesture(SimultaneousGesture(zoomGesture, dragGesture))
.gesture(doubleTapGesture)
}.padding(.bottom, 50) // Ensure carousel appears beneath
}
}
}
}
@@ -151,8 +223,8 @@ struct ImageCarousel: View {
}
}
.cornerRadius(10)
.sheet(isPresented: $open_sheet) {
ImageViewer(urls: urls)
.fullScreenCover(isPresented: $open_sheet) {
ImageView(urls: urls)
}
.frame(height: 200)
.onTapGesture {
@@ -164,6 +236,6 @@ struct ImageCarousel: View {
struct ImageCarousel_Previews: PreviewProvider {
static var previews: some View {
ImageCarousel(urls: [URL(string: "https://jb55.com/red-me.jpg")!])
ImageCarousel(urls: [URL(string: "https://jb55.com/red-me.jpg")!,URL(string: "https://jb55.com/red-me.jpg")!])
}
}