Den 15 juni 2016 6:00 em skrev "Igor Mironchik" <igor.mironc...@gmail.com>: > > Hello. > > > On 15.06.2016 16:59, Konstantin Shegunov wrote: >> >> Hello, >> >> >> On Wed, Jun 15, 2016 at 4:15 PM, Igor Mironchik <igor.mironc...@gmail.com> wrote: >>> >>> Parent of the handles is the same as Line's. But Line own objects of handles with QScopedPointer. >> >> >> This doesn't sound right. If the handles are not children to the line, then the line doesn't own them. Leaving semantics aside, it sounds you're trying to "hijack" the ownership from the parent by using these scoped pointers. > > > Exactly. I need to Line be as parent of handles but they should be parented to the scene (read form in my app) because I need boundingRect() to return exactly bounding rectangle of the line without handles. An I need handles to be removed with the Line if Line deleted. > > I know that I can implement my own method in Line like boundingRectOfLine() and make handles children of Line. May be it would be a better solution, but at this time I have such code and it work...
I'm pretty sure this is the right solution. Don't fight the system and make the handles children of the line, and introduce a special function to get the line rect. At least that's what I'd do. You say your current code works, but surely you have some problems with it or you wouldn't ask? :) Elvis > > >> >>> >>> So my question is it possible that handle will be deleted before Line, so QScopedPointer will try to free already deleted pointer? >> >> >> From your description I'd guess this is exactly what's happening. > > > Here you aren't right. In d_tor() of QGraphicsScene I see: > > while (!d->topLevelItems.isEmpty()) > delete d->topLevelItems.first(); > > where topLevelItems are in creating order... > > and in QGraphicsItem d_tor() > > while (!d_ptr->children.isEmpty()) > delete d_ptr->children.first(); > > So when Line deleted it places before handles in children list, and before Line deleted handles already deleted and removed from children list. > > >> >> Kind regards. >> >> >> On Wed, Jun 15, 2016 at 4:15 PM, Igor Mironchik <igor.mironc...@gmail.com> wrote: >>> >>> Hi folks, >>> >>> Let's say I have QGraphicsItem, let it be Line. This Line has move handles - another QGraphicsItems, rectangles. Parent of the handles is the same as Line's. But Line own objects of handles with QScopedPointer. >>> >>> When Line creates in c_tor() it creates handles, so handles adds to the scene after Line. When I delete Line from the scene by hand everything is fine: Line deletes and QScopedPointers free handles. >>> >>> But if I close application and scene destroys with d_tor() in which it deletes all child items. So my question is it possible that handle will be deleted before Line, so QScopedPointer will try to free already deleted pointer? >>> >>> Thank you. >>> _______________________________________________ >>> 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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