[Development] Which changes are suitable for 5.6?

[Gunnar Roth]

Hi Thiago,

to make qt 5.6.x support the quick controls2 there are only a few changes needed.
1. category is just adding code, which does not influence current code.
    a. adding qAsConst in qgolbal.h. That is actually something i really like to have in qt 5.6, because it is very useful and has no risk. 
    b. adding EditorFont to qplatformtheme.h enumeration ,has  also no risk.
    c. protect cleanup of QQmlEngine when removing from QQmlDebugConnector in destructor, because quickcontrols2 instantiates 
        it in  a way that it is not registered, but on cleanup crashes when removing as there is no check if it was added at all. I consider
        that a bug in Qt 5.6.1
 
  d. adding QQuickItem::isAncestorOf function to qquickitem.* has also no risk.
  e. adding Q_QUICK_PRIVATE_EXPORT to  QQuickStateAction  class in qquickstate_p.h

2. category is enhancing code but also modifies existing code.

  a.  enhance qml module lookup behavior in a way making things a lot easier.

       qqmlimport.* is changed ( by merging simply the code from 5.7 to do a lookup like this:
       For example, QtQml.Models 2.0:
       - base/QtQml/Models.2.0/qmldir
       - base/QtQml.2.0/Models/qmldir
       - base/QtQml/Models.2/qmldir
       - base/QtQml.2/Models/qmldir
       - base/QtQml/Models/qmldir
      This is very convenient. quickcontrols2 works without that but only with the default style. quickcontrols1 is jumping 
      through hoops to achieve similar without change qtdeclarative.

  b. adding MovementDirection property  to QQuickPathView, i just copied qquickpathview.* from qt 5.7. I assume a low risk, 
      but qt 5.7 has the same risk then.

The changes in the quick controls itself are just a matter of changing some 7 to a 6, 5.7.0 to 5.6.1 and 2.7 to 2.6

So actually I don’t see a dragon but maybe a dwarf lizard there ;-)

I can send the actual patches on request, they do not contain any code I wrote myself ( other than changing numbers)



Regards,
Gunnar Roth




> Am 12.08.2016 um 18:26 schrieb Thiago Macieira <thiago.macieira at intel.com>:
> 
> On sexta-feira, 12 de agosto de 2016 14:03:24 PDT Gunnar Roth wrote:
>> Does a request of  having qtquickcontrols2 and qtvirtualkeyboard 2.1
>> backported to 5.6. x have chance? Actually I managed to do this myself, but
>> an upstream solutuion is preferrable. The problem is that some important OS
>> is no longer supported in 5.7. 
> 
> Quite impossible. Those are defintely new features.
> 
> However, there's a compromise: we can have a branch for the unofficial support. 
> Anyone using that will know "there be dragons"
> 
> -- 
> Thiago Macieira - thiago.macieira (AT) intel.com
>  Software Architect - Intel Open Source Technology Center
> 
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