[webkit-dev] Is it OK to remove Frame::setIsDisconnected() and isDisconnected() ?

Maciej Stachowiak mjs at apple.com
Wed Apr 15 14:21:16 PDT 2009

On Apr 15, 2009, at 1:29 PM, Sverrir Á. Berg wrote:

> Hi Adam,
> Thanks for the links.  These are simply exposing the functions as a  
> formal a API's.  I understand that you typically don't want to  
> change externally exposed API's but these can easily be stubbed out  
> (or removed).
> I should have pointed out in my original email that I have tried to  
> remove these API's and I can still run all the WebKit/Mac tests  
> fine.  So at least two things are missing (IMHO) - tests that verify  
> that this functionality is working as intended and documentation to  
> tell what that intent is.  But this is only required if somebody is  
> actually using these functions...

The API (system-private API actually, or "SPI" as we call it) in  
question is used by Safari. I don't believe it would be safe to remove  
this flag. The intent of the WebFrame API is that you can make a frame  
act (from the point of view of content inside it) as if it is a top- 
level frame, even though it is actually a subframe. One case where  
this might be useful is if you wanted to build a custom browser-like  
UI partially using HTML, which could then load pages as subframes  
without exposing that fact. It is true and unfortunate that we don't  
have tests - the ObjC API does not have as much test coverage as  
features exposed to Web content.

  - Maciej

> Thanks,
> Sverrir
> On Wed, Apr 15, 2009 at 4:17 PM, Adam Roben <aroben at apple.com> wrote:
> On Apr 15, 2009, at 3:48 PM, Sverrir Á. Berg wrote:
> Working on a change in FrameTree and noticed that the checks in  
> top() and parent() for 'checkForDisconnectedFrame' rely on a flag in  
> Frame that as far as I can tell is never set.
> So my naive question is: Can I remove the corresponding code from  
> Frame and FrameTree?  If not I would like if somebody could explain  
> how they are used so I don't break anything with my change.
> More detail:
> * My search for calls to Frame::setIsDisconnected reveals no callers  
> in WebKit, Chromium or Google code search.
> There are two callers:
> http://trac.webkit.org/browser/trunk/WebKit/mac/WebView/WebFrame.mm?rev=42451#L1115
> and
> http://trac.webkit.org/browser/trunk/WebKit/win/WebFrame.cpp?rev=42451#L283
> -Adam
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> webkit-dev at lists.webkit.org
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