[Webkit-unassigned] [Bug 199793] New: WKWebView PDF viewer doesn't respect selection and callout preferences

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=199793

            Bug ID: 199793
           Summary: WKWebView PDF viewer doesn't respect selection and
                    callout preferences
           Product: WebKit
           Version: Other
          Hardware: All
                OS: iOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: PDF
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: josip04 at hotmail.com

I am trying to disable Copy callout on `WKWebView` for all document types.

Try 1 (JavaScript):
WebKit built in PDF viewer doesn't respect selection and callout preferences set on `WKWebView`.

Executing this JS `document.documentElement.style.webkitUserSelect='none';` in web view that contains PDF doesn't do anything it seems. This works well for any other document type as far as I can tell.

Try 2 (responder chain)

Subclassing `WKWebView` and overriding `canPerformAction` doesn't help either. It seems that this is being called for some actions but not Copy. My guess is that some object deeper in hierarchy (maybe `PDFHostViewController`?) overrides this method and allows Copy action.

All I can think of is to play with private view hierarchies and swizzle this method to hook in behaviour that I need. Are there any other workarounds?

Since PDF preview is transparent for `WKWebView` users I feel both of these approaches should work out of the box?


I am seeing the same behaviour on macOS and iOS.

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