feat(view model): 增加自定义调色板

可以自动保存和加载调色板

Signed-off-by: Ching <loooching@gmail.com>

EmojiArt.xcodeproj/project.pbxproj

@@ -17,6 +17,7 @@
 		248D14F029A230FE00AE4C0D /* Constants.swift in Sources */ = {isa = PBXBuildFile; fileRef = 248D14EF29A230FE00AE4C0D /* Constants.swift */; };
 		248D14F329A2435000AE4C0D /* UtilityViews.swift in Sources */ = {isa = PBXBuildFile; fileRef = 248D14F129A2435000AE4C0D /* UtilityViews.swift */; };
 		248D14F629A243F200AE4C0D /* UtilityExtensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 248D14F529A243F200AE4C0D /* UtilityExtensions.swift */; };
+		24E5FE8929A7AB4000794732 /* PaletteStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = 24E5FE8829A7AB4000794732 /* PaletteStore.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -32,6 +33,7 @@
 		248D14EF29A230FE00AE4C0D /* Constants.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Constants.swift; sourceTree = "<group>"; };
 		248D14F129A2435000AE4C0D /* UtilityViews.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = UtilityViews.swift; sourceTree = "<group>"; };
 		248D14F529A243F200AE4C0D /* UtilityExtensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = UtilityExtensions.swift; sourceTree = "<group>"; };
+		24E5FE8829A7AB4000794732 /* PaletteStore.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PaletteStore.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -69,6 +71,7 @@
 				24145E7D29A1489700ECB9D1 /* EmojiArtDocumentView.swift */,
 				248D14F129A2435000AE4C0D /* UtilityViews.swift */,
 				24145E8A29A1498500ECB9D1 /* EmojiArtModel.swift */,
+				24E5FE8829A7AB4000794732 /* PaletteStore.swift */,
 				248D14F529A243F200AE4C0D /* UtilityExtensions.swift */,
 				248D14EB29A227C700AE4C0D /* EmojiArtDocument.swift */,
 				24145E8C29A225E900ECB9D1 /* EmojiArtModel.Background.swift */,
@@ -161,6 +164,7 @@
 				24145E7C29A1489700ECB9D1 /* EmojiArtApp.swift in Sources */,
 				248D14EC29A227C700AE4C0D /* EmojiArtDocument.swift in Sources */,
 				248D14F029A230FE00AE4C0D /* Constants.swift in Sources */,
+				24E5FE8929A7AB4000794732 /* PaletteStore.swift in Sources */,
 				24145E8B29A1498500ECB9D1 /* EmojiArtModel.swift in Sources */,
 				24145E8D29A225E900ECB9D1 /* EmojiArtModel.Background.swift in Sources */,
 				248D14F629A243F200AE4C0D /* UtilityExtensions.swift in Sources */,

EmojiArt/EmojiArtApp.swift

@@ -10,6 +10,8 @@ import SwiftUI
 @main
 struct EmojiArtApp: App {
     let document = EmojiArtDocument()
+    let paletteStore = PaletteStore(named: "Default")
+
     var body: some Scene {
         WindowGroup {
             EmojiArtDocumentView(document: document)

EmojiArt/PaletteStore.swift

@@ -0,0 +1,79 @@
+//
+//  PaletteStore.swift
+//  EmojiArt
+//
+//  Created by ching on 2023/2/23.
+//
+
+import SwiftUI
+
+struct Palette: Identifiable, Codable {
+    var name: String
+    var emojis: String
+    var id: Int
+    
+    fileprivate init(name: String, emojis: String, id: Int) {
+        self.name = name
+        self.emojis = emojis
+        self.id = id
+    }
+}
+
+class PaletteStore: ObservableObject {
+    let name: String
+    
+    @Published var palettes = [Palette]() {
+        didSet {
+            storeInUserDefaults()
+        }
+    }
+    
+    private var userDefaultsKey: String {
+        "PaletteStore:" + name
+    }
+    
+    private func storeInUserDefaults() {
+        UserDefaults.standard.set(try? JSONEncoder().encode(palettes), forKey: userDefaultsKey)
+    }
+    
+    private func restoreFromUserDefaults() {
+        if let jsonData = UserDefaults.standard.data(forKey: userDefaultsKey),
+        let decodedPalettes = try? JSONDecoder().decode(Array<Palette>.self, from: jsonData) {
+            palettes = decodedPalettes
+        }
+    }
+    
+    init(named name: String) {
+        self.name = name
+        restoreFromUserDefaults()
+        if palettes.isEmpty {
+            print("using built-in palettes")
+            insertPalette(named: "Vehicles", emojis: "🚗🚕🚙🚌🚎🏎🚓🚑🚒🚐🛻🚚🚛🚜🦯🦽🦼🛴🚲🛵🏍🛺🚨🚔🚍🚘🚖🛞🚡🚠🚟🚃🚋🚞🚝🚄🚅🚈🚂🚆🚇🚊🚉✈️🛫🛬🛩")
+            insertPalette(named: "Sports", emojis: "⚽️🏀🏈⚾️🥎🎾🏐🏉🥏🎱🪀🏓🏸🏒🏑🥍🏏")
+        } else {
+            print("loaded palettes")
+        }
+    }
+    
+    // Intent
+    
+    func palette(at index: Int) -> Palette {
+        let safeIndex = min(max(index, 0), palettes.count - 1)
+        return palettes[safeIndex]
+    }
+    
+    @discardableResult
+    func removePalette(at index: Int) -> Int {
+        if palettes.count > 1, palettes.indices.contains(index) {
+            palettes.remove(at: index)
+        }
+        return index % palettes.count
+    }
+    
+    func insertPalette(named name: String, emojis: String? = nil, at index: Int = 0) {
+        let unique = (palettes.max(by: { $0.id < $1.id })?.id ?? 0) + 1
+        let palette = Palette(name: name, emojis: emojis ?? "", id: unique)
+        let safeIndex = min(max(index, 0), palettes.count)
+        palettes.insert(palette, at: safeIndex)
+    }
+}