Hi! I have just received a vivid-proposed image and noticed that U1db no longer loads the defaults (which was probably a processed QVariantMap from JS). Did this change break it/could it break even more components? > Date: Tue, 17 Feb 2015 09:37:38 +0200 > From: timo.jyri...@canonical.com > To: ubuntu-phone@lists.launchpad.net > CC: ubuntu-de...@lists.ubuntu.com > Subject: [Ubuntu-phone] Qt 5.4 QVariant change and module news > > Qt 5.4 is now in vivid, powering Ubuntu Phone starting with devel > image #102, Kubuntu's Plasma 5 and also the Unity 8 desktop preview. > No app changes are generally needed, but there is a change in QVariant > that may be relevant to C++ using apps. > > == QVariant change in Qt 5.4 == > > QVariant has changed a bit in Qt 5.4, although in a way that fixing > its use does not affect negatively use in Qt 5.3 either. > > Quote: ”When a JavaScript object/array is passed to C++ through a > QVariant, the engine no longer immediately converts the object > recursively into a QVariantMap or QVariantList but instead stores a > QJSValue in the QVariant. This prevents a loss of data when the JS > object contains non-primitive types such as function objects for > example. Code that expects the variant type to be exactly > QVariant::Map or QVariant::List may need to be adapted. Registered > conversion functions however ensure that code that merely calls > toMap() or toList() continues to work.” [QTBUG-40431] > > Examples of fixes: > - Oxide: https://code.launchpad.net/~aacid/oxide/qt54_variantjs/+merge/248765 > - Ubuntu UI Toolkit: > https://code.launchpad.net/~aacid/ubuntu-ui-toolkit/statesaver_54/+merge/247986 > > Another noted small difference: > ”In Qt 5.4 an alias to a null variable is correctly null instead of > undefined like it was in Qt 5.3” > > == Status of less supported Qt modules == > > It's useful to remember that not all of Qt we have in Ubuntu is > supported by the Qt Project: > > - qtlocation: Upstream releases this as part of their releases, but > they emphasize that Qt Positioning is API stable while Qt Location > might change. Still, this should be pretty safe to use and will > probably be declared stable soon. > - qt3d: The original module has not been developed for two years. A > complete rewrite has been in development during that time. Qt 3D 2.0 > will be available as a preview with Qt 5.5. > - qtsystems: Semi-active development. Qt 5.4 absorbed QStorageInfo to > be official part of qtbase, but it is a bit different and oddly does > not have QML support at this point. We include the SystemInfo module > on the phone images, but currently not the Publish Subscribe or > Service Framework modules from the same source. > - qtpim: Semi-active development, but can be considered supported > since our Renato is one of the upstream developers. Ubuntu uses the > Contacts/Organizer extensively in phone/scheduling apps. > - qtfeedback: Stable in the sense that there is no development > happening. It's also a very small module. If you are interested in the > module, consider taking an active role in the Qt Project where > contributions would surely be welcome. > > -Timo > > -- > Mailing list: https://launchpad.net/~ubuntu-phone > Post to : ubuntu-phone@lists.launchpad.net > Unsubscribe : https://launchpad.net/~ubuntu-phone > More help : https://help.launchpad.net/ListHelp
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