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1、notification.Notethatthenewchildmightnotbefullyconstructedwhenthisnotificationissent;callingpurevirtualfunctionsonthechildcanleadtoacrash.QGraphicsItem:：ItemChildRemovedChange7Achildisremovedfromthisitem.Thevalueargumentisthechilditemthatisabouttoberemoved(i.e.zaQGrdphicsItempointer).Thereturnvaluei
2、sunused;yocannotadjustanythinginthisnotification.numQGraphicsItem:GraphicsItemFlagflagsOGraphicsItem:GraphicsIteinFlagsThisenumdescribesdifferentflagsthatyoucansetonanitemtotoggledifferentfeaturesintheitem1sbehavior.Allflagsaredisabledbydefault.ConstantValueDescriptionQGraphicsItem:ItemIsMovableOxlT
3、heitemsupportsinteractivemovementusingthemouse.Byclickingontheitemandthendragging,theitemwillmovetogetherwiththemousecursor.Iftheitemhaschildren/allchildrenarealsomoved.IftheitemISpartofaSelectionrallselecteditemsarealsomoved-Thisfeature1.sprovidedasaconveniencethroughthebaseimplementationofQGraphic
4、sItem1Smouseeventhandlers-QGraphicsItem:IteniIsSelectable0x2Theitemsupportsselection.EnablingthisfeaturewillenablesetSelected()totoggleselectionfortheitem.ItwillalsolettheitembeselectedautomaticallyasaresultofcallingQGraphicsScene:JsetSelectionArea)rbyclickingonanitem,orbyusingrubberbandselectioninQ
5、GraphicsView.QGraphicsItem:ItemlsFocusable0x4Theitemsupportskeyboardinputfocus(i.e.jitisaninputitem).EnablingthisflagwillallowtheitemtoacceptfocusjwhichagainallowsthedeliveryofkeyeventstoQGraphicsItem:ReyPressEvent()andQGraphicsItem:ReyReleaseEvent().TheGraphicsItemFlagstypeisatypedefforQFlags.Itsto
6、resanORcnbinationofGraphicsItemFlagvalues.MemberFunctionDocumentationQGraphlcsltem:JQGraphicsltem(QGraphicsItem*parent-0,QGraphicsScenescene0)ConstructsaQGraphicsItemwiththparentparentonscene.IfparentisOrtheitemwillbeatop-level.Ifsceneis0,thitemwillnotbeassociatedwithascene.virtualitschildren.IfthisitemistheitemwillberemovedfromtheconstSeealsoQGraphicsScene:addltem).QGraphicsItem:-QGraphicsItem()?DestroystheQGraphicsItemandallcurrentlyassociatedwithascenezscenebeforeitisdeleted,boolQGraphicsItem:racceptDrops()
