83 lines
1.8 KiB
Swift
83 lines
1.8 KiB
Swift
//
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// Copyright (c) 2022 Open Whisper Systems. All rights reserved.
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//
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import UIKit
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// ImageEditorContents represents a snapshot of canvas
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// state.
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//
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// Instances of ImageEditorContents should be treated
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// as immutable, once configured.
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class ImageEditorContents: NSObject {
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typealias ItemMapType = OrderedDictionary<String, ImageEditorItem>
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// This represents the current state of each item,
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// a mapping of [itemId : item].
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var itemMap = ItemMapType()
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// Used to create an initial, empty instances of this class.
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override init() {
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}
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// Used to clone copies of instances of this class.
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init(itemMap: ItemMapType) {
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self.itemMap = itemMap
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}
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// Since the contents are immutable, we only modify copies
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// made with this method.
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func clone() -> ImageEditorContents {
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return ImageEditorContents(itemMap: itemMap)
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}
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@objc
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func item(forId itemId: String) -> ImageEditorItem? {
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return itemMap[itemId]
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}
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@objc
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func append(item: ImageEditorItem) {
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Logger.verbose("\(item.itemId)")
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itemMap.append(key: item.itemId, value: item)
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}
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@objc
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func replace(item: ImageEditorItem) {
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Logger.verbose("\(item.itemId)")
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itemMap.replace(key: item.itemId, value: item)
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}
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@objc
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func remove(item: ImageEditorItem) {
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Logger.verbose("\(item.itemId)")
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itemMap.remove(key: item.itemId)
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}
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@objc
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func remove(itemId: String) {
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Logger.verbose("\(itemId)")
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itemMap.remove(key: itemId)
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}
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@objc
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func itemCount() -> Int {
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return itemMap.count
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}
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@objc
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func items() -> [ImageEditorItem] {
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return itemMap.orderedValues
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}
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@objc
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func itemIds() -> [String] {
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return itemMap.orderedKeys
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}
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}
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