Disable scroll for PDFView inside NSCollectionView - objective-c

Question

I have a PdfView inside a CollectionView. Since both have its own scrollviews I have conflicts in scrolling. So i want to disable scrolling for PdfView. How can I do it?

Answer 1

My solution is a little rough, but does work.
I only wanted to stop horizontal scrolling on my PDFViews - my collection view scrolls horizontally.
I made a view that selectively filters out the scroll mouse events and put it over the PFD view.
class HorizontalScrollBlockerView: NSView
{
var scrollNextResponder: NSResponder?
override func scrollWheel(with event: NSEvent) {
guard scrollNextResponder != nil else {
return
}
if fabs(event.deltaX) >= fabs(event.deltaY) {
scrollNextResponder!.scrollWheel(with: event)
} else {
super.scrollWheel(with: event)
}
}
}
I set the view's 'scrollNextResponder' to be the superView of the PDFView.
I also wrote a method that gets the first child scroll view (enclosedScrollView) which makes sure the PDFView is solid in the horizontal axis when correctly scaled.
if let scrollView = pdfView.enclosedScrollView {
scrollView.usesPredominantAxisScrolling = true
scrollView.hasHorizontalScroller = false
scrollView.horizontalScrollElasticity = NSScrollView.Elasticity.none
}

Answer 2

For a regular Scroll View you can remove scrolls by setting horizontal & vertical scrolls to false value. So for a PDF view try this :
NSScrollView *enclosingScrollView = [myPdfView enclosingScrollView];
[enclosingScrollView setHasHorizontalScroller:NO];
[enclosingScrollView setHasVerticalScroller:NO];