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jbmorleyjbmorley
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feat!: Stream incremental changes directly to the collection view (#30)
This change introduces `CollectionViewStreamingCollection` and `CollectionViewProxy` to allow incremental updates to be directly streamed to the hosted collection view instance. This obviates the need to diff the collection when performing updates and significantly improves performance when handling large amounts of data.
1 parent 42c1cdc commit 15b4b55

23 files changed

Lines changed: 781 additions & 332 deletions

‎Example/Example.xcodeproj/project.pbxproj‎

Lines changed: 21 additions & 135 deletions
Original file line numberDiff line numberDiff line change
@@ -3,27 +3,11 @@
33
archiveVersion = 1;
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classes = {
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6-
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6+
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2711
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2913
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4428
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4630
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6434
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6835
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37+
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38+
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7245
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9366
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9568
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102-
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105-
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106-
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107-
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111-
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112-
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113-
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115-
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116-
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117-
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119-
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120-
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121-
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122-
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123-
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124-
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125-
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126-
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127-
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128-
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129-
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130-
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131-
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132-
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133-
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13469
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13570
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13671
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13772
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73+
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14176
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14277
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@@ -153,46 +88,6 @@
15388
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15489
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15590
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156-
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181-
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184-
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187-
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193-
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194-
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19691
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19792
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19893
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@@ -223,6 +118,9 @@
223118
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224119
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226124
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227125
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228126
D841635C28AA283B007812D8 /* SelectableCollectionView */,
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244142
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245143
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145+
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247148
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248149
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249150
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@@ -262,6 +163,9 @@
262163
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263164
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264165
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166+
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167+
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265169
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266170
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267171
productReference = D841634428AA26FE007812D8 /* ExampleUITests.xctest */;
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315219
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316220
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317221
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320222
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321223
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322224
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@@ -341,34 +243,20 @@
341243
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342244
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343245
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344-
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347-
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349-
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351-
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352-
D825950928AA46C000A36359 /* StateToolbar.swift in Sources */,
353-
D825950128AA3F7800A36359 /* Item.swift in Sources */,
354-
D82594FC28AA3E3500A36359 /* Model.swift in Sources */,
355246
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356247
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357248
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358249
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359250
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360251
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361252
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365255
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372260
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@@ -519,6 +407,7 @@
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521409
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410+
MACOSX_DEPLOYMENT_TARGET = 14.0;
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MARKETING_VERSION = 1.0;
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PRODUCT_BUNDLE_IDENTIFIER = uk.co.inseven.Example;
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PRODUCT_NAME = "$(TARGET_NAME)";
@@ -544,6 +433,7 @@
544433
"$(inherited)",
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"@executable_path/../Frameworks",
546435
);
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MACOSX_DEPLOYMENT_TARGET = 14.0;
547437
MARKETING_VERSION = 1.0;
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PRODUCT_BUNDLE_IDENTIFIER = uk.co.inseven.Example;
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PRODUCT_NAME = "$(TARGET_NAME)";
@@ -555,7 +445,6 @@
555445
D841635228AA26FE007812D8 /* Debug */ = {
556446
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557447
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558-
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559448
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560449
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561450
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573462
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574463
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575464
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576-
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577465
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578466
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579467
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@@ -591,7 +479,6 @@
591479
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592480
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593481
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595482
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596483
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597484
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607494
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608495
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609496
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610-
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611497
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612498
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613499
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‎Example/Example/Model/Creator.swift‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,95 @@
1+
// Copyright (c) 2022-2026 Jason Morley
2+
//
3+
// Permission is hereby granted, free of charge, to any person obtaining a copy
4+
// of this software and associated documentation files (the "Software"), to deal
5+
// in the Software without restriction, including without limitation the rights
6+
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
7+
// copies of the Software, and to permit persons to whom the Software is
8+
// furnished to do so, subject to the following conditions:
9+
//
10+
// The above copyright notice and this permission notice shall be included in all
11+
// copies or substantial portions of the Software.
12+
//
13+
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14+
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15+
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16+
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17+
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
18+
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
19+
// SOFTWARE.
20+
21+
import Combine
22+
import SwiftUI
23+
import SelectableCollectionView
24+
25+
@Observable
26+
class Creator: CollectionViewStreamingCollection {
27+
28+
enum Operation: CaseIterable {
29+
case add
30+
case remove
31+
case move
32+
case update
33+
34+
static func random() -> Self {
35+
return allCases.randomElement()!
36+
}
37+
}
38+
39+
private var collectionView: (any CollectionViewProxy<Item>)? = nil
40+
public var items: [Item] = []
41+
private var isActive: Bool = true
42+
43+
func run() {
44+
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { [weak self] in
45+
guard let self else {
46+
return
47+
}
48+
defer { self.run() }
49+
50+
switch Operation.random() {
51+
case .add:
52+
let item = Item()
53+
let index = Int.random(in: 0..<items.count + 1)
54+
items.insert(item, at: index)
55+
collectionView?.insertItem(item, atIndex: index, items: Array(items))
56+
case .remove:
57+
guard !items.isEmpty else {
58+
return
59+
}
60+
let index = Int.random(in: 0..<items.count)
61+
let item = items.remove(at: index)
62+
collectionView?.removeItemWithId(item.id, atIndex: index, items: Array(items))
63+
case .move:
64+
guard !items.isEmpty else {
65+
return
66+
}
67+
let from = Int.random(in: 0..<items.count)
68+
let to = Int.random(in: 0...items.count) // Apple's move implementation _always_ treats it as inserting before this index.
69+
let item = items[from]
70+
items.move(fromOffsets: [from], toOffset: to)
71+
collectionView?.moveItem(item, toIndex: to, items: Array(items))
72+
case .update:
73+
guard !items.isEmpty else {
74+
return
75+
}
76+
let index = Int.random(in: 0..<items.count)
77+
var item = items[index]
78+
item.count += 1
79+
items[index] = item // We currently need to replace this because it's a struct.
80+
collectionView?.updateItem(item, atIndex: index, items: items)
81+
}
82+
83+
}
84+
}
85+
86+
init() {
87+
run()
88+
}
89+
90+
func collectionViewDidConnect(_ collectionView: (any CollectionViewProxy<Item>)?) {
91+
self.collectionView = collectionView
92+
self.collectionView?.setItems(Array(items))
93+
}
94+
95+
}

‎Example/Example/Model/Item.swift‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -20,7 +20,8 @@
2020

2121
import SwiftUI
2222

23-
struct Item: Hashable, Identifiable {
23+
class Item: Identifiable {
2424
let id = UUID()
2525
let color: Color = .random
26+
var count: Int = 0
2627
}

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