Re: WebView find panel/bar implementation
Re: WebView find panel/bar implementation
- Subject: Re: WebView find panel/bar implementation
- From: Mike Abdullah <email@hidden>
- Date: Tue, 02 Apr 2013 17:13:59 +0100
On 2 Apr 2013, at 12:43, email@hidden wrote:
> I provide some app documentation in both RTF and MarkDown and switch in an NSTextView or WebView for display as required.
> Text view searching works well using the NSTextFinder find bar.
> However, implementing a WebView find panel/bar seems difficult.
>
> - (void)performFindPanelAction:(id)sender is still not implemented - ref: https://bugs.webkit.org/show_bug.cgi?id=3640
> Current WebKit source still documents this as unimplemented - ref: https://trac.webkit.org/browser/trunk/Source/WebKit/mac/WebView/WebHTMLView.mm
>
> Some swizzling however can be effective - ref : http://www.taffysoft.com/pages/20120908-01.html
> So this can be investigated.
>
> But I don't see much in way of integrating NSTextFinder and WebView. The NSTextFinderClient protocol is quite extensive, which might explain why.
>
> Does anyone have any further insight into this?
The problem is that Cocoa's Find Bar provides a whole raft of its own functionality, not just a UI. It requires you to feed it a string, which it will then search itself. There's no way (that I've come across) to have it ask you to perform a search on its behalf.
I believe the reason for this is that the Find Bar actually supports some pretty complex, regular-expression-based searches, such as finding the URLs in a given piece of text.
WebKit does supply a decent bit of search functionality as it happens. It's kinda hidden though — look up the WebDocumentSearching protocol! You could provide your own UI atop that.
To make use of the find bar, I think you'd have to:
A) Walk the DOM for text nodes to feed into NSTextFinder. Make sure to handle whitespace the same way as WebKit renders it
B) Implement looking up a bit of such text from a given index. Likely some sort of cache is needed to avoid walking the entire DOM every time for this
C) Watch for the DOM being modified as a cue to update the find system
Also, file a radar asking for WebViews to support the Find Bar. Mine's getting lonely!
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