[Development] Using Native web view on OS X

[Morten Sørvig]

> On 25 Jan 2018, at 21:05, Steve Schilz <sschilz at pasco.com> wrote:
> 
>>>>>> 22.01.2018, 18:37, "Alberto Mardegan" <mardy at users.sourceforge.net>:
>>>>>> 	Hi all!
>>>>>> 	??I've developed a desktop application which uses the WebView QML
>>>>>> 	module, with the hope of publishing it in the Apple store. However,
>>>>>> 	unless I am seriously mistaken, this is just not possible (or maybe the
>>>>>> 	documentation needs some serious love).
>>>>>> 
>>>>>> 	No matter what I try, it seems that QtWebEngine is always required!
>>>>>> 
>>>>>> 	If I simply remove QtWebEngine from my Qt installation, building the
>>>>>> 	application succeeds but then when I run it I get the same error as in
>>>>>> 	https://bugreports.qt.io/browse/QTBUG-63107
>>>>>> 
>>>>>> 	If I look at src/webview/qtwebviewfunctions.cpp it looks like the
>>>>>> 	decision to use the native webview vs QtWebEngine is done at runtime,
>>>>>> 	but for some reason it looks like one still needs to have QtWebEngine
>>>>>> 	available in order for QtWebView to build successfully. With the obvious
>>>>>> 	consequence that one won't be able to publish one's app into the Apple
>>>>>> 	store.
>>>>>> 
>>>>>> 	Is there some reason why the QtWebEngine support library isn't dlopen'ed
>>>>>> 	at runtime? Can I file a bug about that?
>>>>>> 
>>>>>> 	From [1] it seems like QT_MAC_USE_NATIVE_WEBVIEW environment variable
>>>>>> 	is required to use native backend.
>>>>>> 
>>>>>> 	[1] https://codereview.qt-project.org/#/c/162337/
>>>>>> 
>>>>>> 
>>>>>> Ciao,
>>>>> ? ?Alberto
> 
>>>>> 	?On 22/01/2018 18:49, Konstantin Tokarev wrote:
>>>>> 		?From [1] it seems like QT_MAC_USE_NATIVE_WEBVIEW environment variable is required to use native backend.
>>>>> 	
>>>>> 		?[1] https://codereview.qt-project.org/#/c/162337/
>>>>> 
>>>>> 		Regards,
>>>>> 		Konstantin
> 
>>>> 	 ?On 22 Jan 2018, at 18:22, Alberto Mardegan <mardy at users.sourceforge.net> wrote:
>>>> 		?Yes, but still QtWebEngine is required, as QtWebView is linking to it.
>>>> 		?I've now removed a few lines of code here and there and got a version of
>>>> 		?QtWebView which builds fine under macos without being linked to QtWebEngine.
>>> 		?I'll soon try to see if it actually works.
>>>> 
>>>> 		?Ciao,
>>>> 		??Alberto
>>>> 
> 
>>> 	>> 23.01.2018, 17:09, "Morten S?rvig" <morten.sorvig at qt.io>:
>>> 		The QtWebEngine requirement does seem to run counter to the purpose of the QtWebView module.
>>> 
>>> 		It?s not really clear from the history what happened, but I think we can restore the original behavior:
>>> 
>>> 		https://codereview.qt-project.org/#/c/217706/
>>> 
>>> 		There was a discussion about run-time plugins in QtWebView, if they were implemented it won't be
>>> 		a problem to load and use QtWebEngine backend if it is really needed, and avoid it otherwise
>>> 
>>> 
>>> 		Morten
>>> 
> 
>> 	23.01.2018, 17:09, "Morten S?rvig" <mailto:morten.sorvig at qt.io>:
>> 		In the end we decided to go with this approach and finalize the plugin patch for dev. The other branches
>> 		will be left as-is. In the mean time it's possible is to build QtWebView from source with the above patch
>> 		If you want to avoid the QtWebEngine requirement.
>> 		
>> 		 Morten
>> 
> Apologies in advance if this comes off in any way as rude, I love Qt, and respect everyone here greatly.
> 
> Am I correct in understanding that you are saying that prebuilt Qt packages cannot be used to submit to the app store,
> And that anyone who wishes to use Qt to develop an app on OSX and submit to the app store must be savvy enough to
> Build from source, and locate this thread in the dev newsgroup, and then apply the patch specified? 

I agree with this point, but as I said we concluded with not changing the current Qt versions. Order
will be restored once the plugin patch is released. I’m not sure what the default plugin will be yet, but at
the very least you can select the native plugin by not building QWebEngine or not deploying the QWebEngine
plugin (e.g. with macdeployqt -appstore-compliant).

Morten