first commit

Package.resolved

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+{
+  "object": {
+    "pins": [
+      {
+        "package": "SDWebImage",
+        "repositoryURL": "https://github.com/SDWebImage/SDWebImage.git",
+        "state": {
+          "branch": null,
+          "revision": "2c53f531f1bedd253f55d85105409c28ed4a922c",
+          "version": "5.12.3"
+        }
+      },
+      {
+        "package": "SDWebImageSwiftUI",
+        "repositoryURL": "https://github.com/SDWebImage/SDWebImageSwiftUI.git",
+        "state": {
+          "branch": null,
+          "revision": "cd8625b7cf11a97698e180d28bb7d5d357196678",
+          "version": "2.0.2"
+        }
+      }
+    ]
+  },
+  "version": 1
+}

Package.swift

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+// swift-tools-version:5.5
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "Zoomable",
+    platforms: [
+        .iOS(.v13),
+        .macOS(.v11)
+    ],
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "Zoomable",
+            targets: ["Zoomable"]),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/SDWebImage/SDWebImage.git", .branch("master")),
+        .package(url: "https://github.com/SDWebImage/SDWebImageSwiftUI.git", .branch("master"))
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "Zoomable",
+            dependencies: ["SDWebImage", "SDWebImageSwiftUI"]),
+        .testTarget(
+            name: "ZoomableTests",
+            dependencies: ["Zoomable"]),
+    ]
+)

README.md

@@ -1 +1,51 @@
-# Zoomable
+# **Zoomable**
+It is a container that allows you to zoom in and out of an image using only SwiftUI.
+
+[![Platforms](https://img.shields.io/badge/Platforms-iOS%20%7C%20macOS-blue?style=flat-square)](https://developer.apple.com/macOS)
+[![iOS](https://img.shields.io/badge/iOS-13.0-blue.svg)](https://developer.apple.com/iOS)
+[![macOS](https://img.shields.io/badge/macOS-11.0-blue.svg)](https://developer.apple.com/macOS)
+[![instagram](https://img.shields.io/badge/instagram-@dev.fabula-orange.svg?style=flat-square)](https://www.instagram.com/dev.fabula)
+[![SPM](https://img.shields.io/badge/SPM-compatible-red?style=flat-square)](https://developer.apple.com/documentation/swift_packages/package/)
+[![MIT](https://img.shields.io/badge/licenses-MIT-red.svg)](https://opensource.org/licenses/MIT)  
+
+## Screenshot
+<img src="Markdown/Zoomable.gif">
+
+## Example Usages
+1. ZoomableView
+    ```swift
+    ZoomableView(size: CGSize(width: 300, height: 300), min: 1.0, max: 6.0, showsIndicators: true) {
+        Image("image")
+            .resizable()
+            .scaledToFit()
+            .background(Color.black)
+            .clipped()
+    }
+    ```
+
+
+3. ZoomableImageView
+    ```swift
+    ZoomableImageView(url: url, min: 1.0, max: 3.0, showsIndicators: true) {
+        Text("ZoomableImageView")
+            .padding()
+            .background(Color.black.opacity(0.5))
+            .cornerRadius(8)
+            .foregroundColor(Color.white)
+    }
+    ```
+
+## Dependencies
+```
+dependencies: [
+    .package(url: "https://github.com/SDWebImage/SDWebImage.git", .branch("master")),
+    .package(url: "https://github.com/SDWebImage/SDWebImageSwiftUI.git", .branch("master"))
+]
+```
+
+## Contact
+instagram : [@dev.fabula](https://www.instagram.com/dev.fabula)  
+email : [dev.fabula@gmail.com](mailto:dev.fabula@gmail.com)
+
+## License
+ZoomableView is available under the MIT license. See the [LICENSE](LICENSE) file for more info.

Sources/Zoomable/ZoomableImageView.swift

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+//
+//  ZoomableImageView.swift
+//  
+//
+//  Created by jasu on 2022/01/27.
+//  Copyright (c) 2022 jasu All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is furnished
+//  to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+//  INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+//  PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+//  CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+//  OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+import SwiftUI
+import SDWebImageSwiftUI
+
+public struct ZoomableImageView<Content>: View where Content: View {
+
+    private var url: URL
+    private var min: CGFloat = 1.0
+    private var max: CGFloat = 3.0
+    private var showsIndicators: Bool = false
+    @ViewBuilder private var overlay: () -> Content
+
+    @State private var imageSize: CGSize = .zero
+
+    /**
+     Initializes an `ZoomableImageView`
+     - parameter url : The image url.
+     - parameter min : The minimum value that can be zoom out.
+     - parameter max : The maximum value that can be zoom in.
+     - parameter showsIndicators : A value that indicates whether the scroll view displays the scrollable component of the content offset, in a way that’s suitable for the platform.
+     - parameter overlay : The ZoomableImageView view’s overlay.
+     */
+    public init(url: URL,
+                min: CGFloat = 1.0,
+                max: CGFloat = 3.0,
+                showsIndicators: Bool = false,
+                @ViewBuilder overlay: @escaping () -> Content) {
+        self.url = url
+        self.min = min
+        self.max = max
+        self.showsIndicators = showsIndicators
+        self.overlay = overlay
+    }
+
+    public var body: some View {
+        GeometryReader { proxy in
+            ZoomableView(size: imageSize, min: self.min, max: self.max, showsIndicators: self.showsIndicators) {
+                WebImage(url: url)
+                    .resizable()
+                    .onSuccess(perform: { image, _, _ in
+                        DispatchQueue.main.async {
+                            self.imageSize = CGSize(width: proxy.size.width, height: proxy.size.width * (image.size.height / image.size.width))
+                        }
+                    })
+                    .indicator(.activity)
+                    .scaledToFit()
+                    .clipShape(Rectangle())
+                    .overlay(self.overlay())
+            }
+        }
+    }
+}

Sources/Zoomable/ZoomableModifier.swift

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+//
+//  ZoomableModifier.swift
+//  ZoomableView
+//
+//  Created by jasu on 2022/01/26.
+//  Copyright (c) 2022 jasu All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is furnished
+//  to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+//  INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+//  PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+//  CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+//  OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+import SwiftUI
+
+public struct ZoomableModifier: ViewModifier {
+
+    private enum ZoomState {
+        case inactive
+        case active(scale: CGFloat)
+
+        var scale: CGFloat {
+            switch self {
+            case .active(let scale):
+                return scale
+            default: return 1.0
+            }
+        }
+    }
+
+    private var contentSize: CGSize
+    private var min: CGFloat = 1.0
+    private var max: CGFloat = 3.0
+    private var showsIndicators: Bool = false
+
+    @GestureState private var zoomState = ZoomState.inactive
+    @State private var currentScale: CGFloat = 1.0
+
+    /**
+     Initializes an `ZoomableModifier`
+     - parameter contentSize : The content size of the views.
+     - parameter min : The minimum value that can be zoom out.
+     - parameter max : The maximum value that can be zoom in.
+     - parameter showsIndicators : A value that indicates whether the scroll view displays the scrollable component of the content offset, in a way that’s suitable for the platform.
+     */
+    public init(contentSize: CGSize,
+                min: CGFloat = 1.0,
+                max: CGFloat = 3.0,
+                showsIndicators: Bool = false) {
+        self.contentSize = contentSize
+        self.min = min
+        self.max = max
+        self.showsIndicators = showsIndicators
+    }
+
+    var scale: CGFloat {
+        return currentScale * zoomState.scale
+    }
+
+    var zoomGesture: some Gesture {
+        MagnificationGesture()
+            .updating($zoomState) { value, state, transaction in
+                state = .active(scale: value)
+            }
+            .onEnded { value in
+                var new = self.currentScale * value
+                if new <= min { new = min }
+                if new >= max { new = max }
+                self.currentScale = new
+            }
+    }
+
+    var doubleTapGesture: some Gesture {
+        TapGesture(count: 2).onEnded {
+            if scale <= min { currentScale = max } else
+            if scale >= max { currentScale = min } else {
+                currentScale = ((max - min) * 0.5 + min) < scale ? max : min
+            }
+        }
+    }
+
+    public func body(content: Content) -> some View {
+        ScrollView([.horizontal, .vertical], showsIndicators: showsIndicators) {
+            content
+                .frame(width: contentSize.width * scale, height: contentSize.height * scale, alignment: .center)
+                .scaleEffect(scale, anchor: .center)
+        }
+        .gesture(ExclusiveGesture(zoomGesture, doubleTapGesture))
+        .animation(.easeInOut, value: scale)
+    }
+}

Sources/Zoomable/ZoomableView.swift

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+//
+//  ZoomableView.swift
+//  ZoomableView
+//
+//  Created by jasu on 2022/01/25.
+//  Copyright (c) 2022 jasu All rights reserved.
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is furnished
+//  to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in all
+//  copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+//  INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+//  PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+//  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+//  CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
+//  OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+import SwiftUI
+
+public struct ZoomableView<Content>: View where Content: View {
+
+    private var size: CGSize
+    private var min: CGFloat = 1.0
+    private var max: CGFloat = 3.0
+    private var showsIndicators: Bool = false
+    @ViewBuilder private var content: () -> Content
+
+    /**
+     Initializes an `ZoomableView`
+     - parameter size : The content size of the views.
+     - parameter min : The minimum value that can be zoom out.
+     - parameter max : The maximum value that can be zoom in.
+     - parameter showsIndicators : A value that indicates whether the scroll view displays the scrollable component of the content offset, in a way that’s suitable for the platform.
+     - parameter content : The ZoomableView view’s content.
+     */
+    public init(size: CGSize,
+                min: CGFloat = 1.0,
+                max: CGFloat = 3.0,
+                showsIndicators: Bool = false,
+                @ViewBuilder content: @escaping () -> Content) {
+        self.size = size
+        self.min = min
+        self.max = max
+        self.showsIndicators = showsIndicators
+        self.content = content
+    }
+
+    public var body: some View {
+        content()
+            .frame(width: size.width, height: size.height, alignment: .center)
+            .contentShape(Rectangle())
+            .modifier(ZoomableModifier(contentSize: self.size, min: min, max: max, showsIndicators: showsIndicators))
+    }
+}

Tests/ZoomableTests/ZoomableTests.swift

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+import XCTest
+@testable import Zoomable
+
+final class ZoomableTests: XCTestCase {
+    func testExample() throws {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct
+        // results.
+        XCTAssertEqual(Zoomable().text, "Hello, World!")
+    }
+}

ZoomableExample/Shared/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}