[webkit-qt] QML integration question

[Harri Pasanen]

I tried this approach and indeed it was very straight forward.
I just refactored QDeclarativeWebView to my own and registered the type.

I needed to intercept the linkClicked(QUrl) signal and that worked fine for 
the desktop.

However, for some reason on harmattan N9 device my own webview does not 
render, everything is black.   I went back so that only change I did was 
renaming the QDeclarativeWebView, but even then it does not render other than 
black.  Any idea what might cause this?  

The source files I used were from QtSDK:
QtSDK/QtSources/4.7.4/src/3rdparty/webkit/WebKit/qt/declarative/qdeclarativewebview_p.h
QtSDK/QtSources/4.7.4/src/3rdparty/webkit/WebKit/qt/declarative/qdeclarativewebview.cpp

Changing the import in qml makes it work/not work.
Between the two runs I don't see any difference in Application Output pane, 
just usual:

Remote process started.
Using the meego graphics system
loaded the Generic plugin 
loaded the grue plugin 
Loaded the MeeGo sensor plugin 
Setting data rate 0 Hz (interval 0 ms) for "meego.orientationsensor" 
Setting data rate 0 Hz (interval 0 ms) for "meego.orientationsensor" 
Found SGX/MBX driver, enabling FullClearOnEveryFrame 
Found v1.4 driver, enabling brokenTexSubImage 
Successfully resolved MeeGo graphics system: 
/usr/lib/qt4/plugins/graphicssystems/libqmeegographicssystem.so 

MeegoGraphics: found EGL_NOK_image_shared
MeegoGraphics: found EGL_KHR_lock_surface2
MeegoGraphics: found EGL_KHR_fence_sync
X Error: BadDamage (invalid Damage parameter) 153
  Extension:    146 (Uknown extension)
  Minor opcode: 2 (Unknown request)
  Resource id:  0x29
hijackWindow() context created for QDeclarativeView(0x1f5e16c0) 1 
Found SGX/MBX driver, enabling FullClearOnEveryFrame 
Found v1.4 driver, enabling brokenTexSubImage 
QGLWindowSurface: Using plain widget as window surface 
QGLWindowSurface(0x1f7d6a48) 
Found EGL_KHR_image_pixmap & GL_OES_EGL_image extensions (preferred method)!
Found texture_from_pixmap EGL extension!

Confused...

/Harri


On Thursday, November 03, 2011 01:06:32 PM Felipe Crochik wrote:
> I have created a new webview qml element from scratch but on one of my many
> (failed) attempts to find out why my application crashes on harmattan I
> also tried copying the qdeclarativewebview.cpp and qdeclarativewebview_p.h
> from the Qt sources and making a few modifications.
> 
> It was surprisingly uneventful and it worked just fine (I just registered
> on my c++ code the type and could swap between "implementations" by just
> changing the import statement on my qml).
> 
> Most likely you will have to modify the "private" parts of the
> implementation so you won't be able to "just" extend the class and with
> future qt releases you will have to manually merge your changes.
> 
> Felipe
> 
> On Thu, Nov 3, 2011 at 4:20 AM, Alexis Menard
> 
> <alexis.menard at openbossa.org>wrote:
> > Hi,
> > 
> > On Thu, Nov 3, 2011 at 4:58 AM, Harri Pasanen <grego at mpaja.com> wrote:
> > > I'm making my first steps in QML, looking at QML Web View element.
> > > 
> > > If I'd like to get access to functionality under the hood to extend
> > > what
> > 
> > QML
> > 
> > > Web View does, how would I go about it?
> > 
> > You in fact can't.
> > 
> > > For instance, I'd like to intercept linkClicked signal that QWebView
> > 
> > sends,
> > 
> > > but QML Web View does not expose.
> > 
> > One way could be to extend QDeclarativeWebView but it's a private
> > class (exported). QDeclarativeWebView is just a wrapper on top of
> > QGraphicsWebView not QWebView.
> > 
> > You can see if you prefer to subclass QGraphicsWebView and expose it in
> > QML.
> > 
> > The WebView element in QtWebKit 1.0 was not developed further as we
> > move to WebKit2/Qt5 where in that world the QML api will be the
> > primary entry point.
> > 
> > > Is there a way to subclass in C++ what ever class QML uses underneath
> > > to implement a better QML Web View element?
> > 
> > See previous.
> > 
> > > I'd appreciate any pointers to either documentation or source code.
> > > 
> > > Or should at ask at qt-qml mailing list?
> > > 
> > > Thanks,
> > > 
> > > Harri
> > > 
> > > 
> > > _______________________________________________
> > > webkit-qt mailing list
> > > webkit-qt at lists.webkit.org
> > > http://lists.webkit.org/mailman/listinfo.cgi/webkit-qt
> > 
> > --
> > Alexis Menard (darktears)
> > Software Engineer
> > INdT Recife Brazil
> > _______________________________________________
> > webkit-qt mailing list
> > webkit-qt at lists.webkit.org
> > http://lists.webkit.org/mailman/listinfo.cgi/webkit-qt
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