It seems that StackView instantiate QML components when push and destroy it when pop, so we cann't get information from previous page. what we should use is StackLayout ?
2018-02-24 11:06 GMT+08:00 Jason H <jh...@gmx.com>: > I would certainly hope so as I've written apps to dynamically manage the > stackview and any user using the app for a few iterations would likely run > out of memory. > > Note that memory mangement in QML is voodoo, and as a result, the actual > destruction is not deterministic. If you need to access popped items, then > StackView is not for you > > What I did to accomplish a wizard was very simply to create an item > containing my various screens, with a single button bar at the bottom, then > make > property var pages: [page1, page2, page3] > property currentPageIndex > > function setCurrentPageIndex(page) { > prevButton.visible = page > 0 > nextButton.visible = page > pages.length-1 > for (i=0;i<pages.length; i++) > pages[i].visible = page ==i > > onCurrentPageIndexChanged: setCurrentPageIndex(currentPageIndex) > > then on your nextButton: > currentPageIndex++; > > prevButton: > currentPageIndex--; > > > > *Sent:* Friday, February 23, 2018 at 4:58 PM > *From:* "Fabrice Salvaire" <fabrice.salva...@orange.fr> > *To:* interest@qt-project.org > *Subject:* [Interest] QtQuick Controls2 : Does StackView garbage collect > popped items ? > > Dear all, > > I am experimenting a way to implement a wizard interface featuring a next > and previous page navigation using QtQuick Controls 2. > > I tried to achieve this using StackView but I receive the error > "TypeError: Type error' when I try to access popped items later, for > example using console.info(popped_item_array) > > It looks like a kind of garbage collection of the Qt object returned by > push and pop. But I could not figure out any explanation of this behaviour > on the Qt doc https://doc-snapshots.qt.io/qt5-5.11/qml-qtquick- > controls2-stackview.html > <https://doc-snapshots.qt.io/qt5-5.11/qml-qtquick-controls2-stackview.html#unwinding-items-via-pop> > However the older implementation had a destroyOnPop feature cf. > http://doc.qt.io/qt-5/qml-qtquick-controls-stackview.html > > Cheers, > > Fabrice > > > _______________________________________________ Interest mailing list > Interest@qt-project.org http://lists.qt-project.org/ > mailman/listinfo/interest > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest > >
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