From be5e513cbc2fb78c37d14ffa0db08b00970719b0 Mon Sep 17 00:00:00 2001
From: Vegard Bieker Matthey <VegardMatthey@protonmail.com>
Date: Thu, 9 Jul 2026 22:56:57 +0200
Subject: [PATCH] feat: reintroduce scrolling

---
 ImageViewer/ViewController.swift | 55 ++++++++++++++++++++++----------
 1 file changed, 39 insertions(+), 16 deletions(-)

diff --git a/ImageViewer/ViewController.swift b/ImageViewer/ViewController.swift
index 11e8912..5ae9b84 100644
--- a/ImageViewer/ViewController.swift
+++ b/ImageViewer/ViewController.swift
@@ -59,8 +59,6 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
     var scrollPos: CGPoint!
     var hasSetContentOffset = false
     var pageCount = 0
-    var pagesAvailable = 0
-    var chapterAndPages: [(Int, Int)] = []
 
     var imageView = UIImageView()
     var mode = PageTurnMode.leftToRight
@@ -136,9 +134,9 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
             readerView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
             readerView.widthAnchor.constraint(equalTo: view.widthAnchor),
         ])
+        setupScrollingCollectionView()
         loadComics()
         setupImageView()
-        setupScrollingCollectionView()
         setupGestures()
         setupBar()
         setupHomeView()
@@ -594,7 +592,7 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
                     }
                     if let indexPath = scrollingCollectionView.indexPathForItem(at: scrollOffset) {
                         var theProgress = ProgressIndices(v: 0, c: 0, i: 0)
-                        for _ in 0 ... indexPath.item {
+                        for _ in 0 ..< indexPath.item {
                             theProgress = getProgressIndicesFromTurn(
                                 turn: .next, progress: theProgress
                             )
@@ -632,9 +630,11 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
         )
 
         if let indexPath = scrollingCollectionView.indexPathForItem(at: centerPoint) {
-            let (chapter, page) = chapterAndPages[indexPath.item]
-            progress.c = chapter
-            progress.i = page
+            var newProgress = ProgressIndices(v: 0, c: 0, i: 0)
+            for _ in 0 ..< indexPath.item {
+                newProgress = getProgressIndicesFromTurn(turn: .next, progress: newProgress)
+            }
+            progress = newProgress
         }
         if scrollingCollectionView.isHidden == false {
             saveLocalState()
@@ -694,7 +694,7 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
         leftView.isHidden = true
         rightView.isHidden = true
         scrollingCollectionView.isHidden = false
-        // TODO: Fix scrolling again
+        scrollingCollectionView.reloadData()
     }
 
     func countFiles() -> Int {
@@ -1028,6 +1028,7 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
         scrollingCollectionView.isHidden = mode != .scroll
         leftView.isHidden = mode == .scroll
         rightView.isHidden = mode == .scroll
+        imageView.isHidden = mode == .scroll
         togglePageTurnDropdown()
         saveLocalState()
     }
@@ -1161,7 +1162,7 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
                 self?.updateInfo()
             }
 
-        for _ in 0 ... preloadCount {
+        for _ in 0 ..< preloadCount {
             newProgress = getProgressIndicesFromTurn(turn: .next, progress: newProgress)
             let path = getImagePath(progress: newProgress)
                 imageLoader.preloadImage(at: path, scaling: scaling, screenSize: UIScreen.main.bounds.size)
@@ -1302,7 +1303,7 @@ class ViewController: UIViewController, UIGestureRecognizerDelegate {
         }
 
         var newProgress = progress
-        for _ in 0 ... preloadCount {
+        for _ in 0 ..< preloadCount {
             newProgress = getProgressIndicesFromTurn(turn: .next, progress: newProgress)
             imageLoader.preloadImage(at: getImagePath(progress: newProgress), scaling: scaling, screenSize: UIScreen.main.bounds.size)
         }
@@ -1375,7 +1376,13 @@ extension ViewController: UICollectionViewDataSource, UICollectionViewDelegateFl
         if collectionView == comicCollectionView {
             return comics.count
         } else {
-            return pagesAvailable
+            var sum = 0
+            for volume in metadata.volumes {
+                for chapter in volume.chapters {
+                    sum += chapter.images.count
+                }
+            }
+            return sum
         }
     }
 
@@ -1391,16 +1398,25 @@ extension ViewController: UICollectionViewDataSource, UICollectionViewDelegateFl
             cell.imageView.image = comics[indexPath.item].cover
             return cell
         } else if collectionView == scrollingCollectionView {
-            // let scaling = UIView.ContentMode.scaleAspectFill
+            let scaling = UIView.ContentMode.scaleAspectFill
             let cell =
                 collectionView.dequeueReusableCell(
                     withReuseIdentifier: "ScrollingImageCell", for: indexPath
                 )
                 as! ScrollingImageCell
             if metadata == nil {
+                print("metadata is nil, should probably not be the case")
                 return cell
             }
-            // TODO: Fix scrolling again
+            var newProgress = ProgressIndices(v: 0, c: 0, i: 0)
+            if indexPath.item != 0 {
+            for _ in 0 ..< indexPath.item {
+               newProgress = getProgressIndicesFromTurn(turn: .next, progress: newProgress)
+            }
+            }
+            imageLoader.loadImage(at: getImagePath(progress: newProgress), scaling: scaling, screenSize: UIScreen.main.bounds.size) { image in
+                cell.imageView.image = image
+            }
             return cell
         } else {
             assertionFailure()
@@ -1417,7 +1433,7 @@ extension ViewController: UICollectionViewDataSource, UICollectionViewDelegateFl
     func collectionView(
         _ collectionView: UICollectionView,
         layout _: UICollectionViewLayout,
-        sizeForItemAt _: IndexPath
+        sizeForItemAt indexPath: IndexPath
     ) -> CGSize {
         if collectionView == comicCollectionView {
             let spacing: CGFloat = 8
@@ -1429,8 +1445,15 @@ extension ViewController: UICollectionViewDataSource, UICollectionViewDelegateFl
             if metadata == nil {
                 return CGSize()
             }
-            // TODO: Fix scrolling again
-            return CGSize()
+            var newProgress = ProgressIndices(v: 0, c: 0, i: 0)
+            for _ in 0 ..< indexPath.item {
+               newProgress = getProgressIndicesFromTurn(turn: .next, progress: newProgress)
+            }
+            let imageMetadata = metadata.volumes[newProgress.v].chapters[newProgress.c].images[newProgress.i]
+            return CGSize(
+                width: readerView.bounds.width,
+                height: CGFloat(imageMetadata.size!.height) * readerView.bounds.width / CGFloat(imageMetadata.size!.width)
+            )
         } else {
             assertionFailure()
         }