c++ - QML - 实现 C++ ListModel 的最佳方式

Question

目前我有一个在 QML 中定义的 ListModel，每个 ListElement 中有许多不同的字段。委托(delegate)根据“myType”值以不同方式使用react。

ListView {
        id: createLocalGameViewList
        anchors.fill: parent
        model: ListModel {
            id: createLocalGameViewModel
            ListElement {
                myId: "comboBox_NumberOfPlayers"
                myTitle: qsTr("Number of players")
                myType: "ComboBox"
                myValuesList: [
                    ListElement { value: "10" },
                    ListElement { value: "9" },
                    ListElement { value: "8" },
                    ListElement { value: "7" },
                    ListElement { value: "6" },
                    ListElement { value: "5" },
                    ListElement { value: "4" },
                    ListElement { value: "3" },
                    ListElement { value: "2" }
                ]
                myValueIsIndex: false
                myValue: ""
            }
            ListElement {
                myId: "spinBox_StartCash"
                myTitle: qsTr("Start cash")
                myType: "SpinBox"
                myMaxValue: "1000000"
                myMinValue: "1000"
                myPrefix: "$"
                myValue: ""
            }
            ListElement {
                myId: "spinBox_StartBlind"
                myTitle: qsTr("Start blind")
                myType: "SpinBox"
                myMaxValue: "20000"
                myMinValue: "5"
                myPrefix: "$"
                myValue: ""
            }                
            ListElement {
                myId: "selector_BlindsRaiseInterval"
                myTitle: qsTr("Blinds raise interval")
                myType: "BlindsRaiseInterval"
                myRaiseOnHandsType: "" //if false it is raise on minutes type
                myRaiseOnHandsInterval: ""
                myRaiseOnMinutesInterval: ""
            }
            ListElement {
                myId: "selector_BlindsRaiseMode"
                myTitle: qsTr("Blinds raise mode")
                myType: "BlindsRaiseMode"
                myAlwaysDoubleBlinds: "" //if false it is "Manual Blinds Order"
                myManualBlindsList: []
                myAfterMBAlwaysDoubleBlinds: ""
                myAfterMBAlwaysRaiseAbout: ""
                myAfterMBAlwaysRaiseValue: ""
                myAfterMBStayAtLastBlind: ""
            }
            ListElement {
                myId: "comboBox_GameSpeed"
                myTitle: qsTr("Game speed")
                myType: "ComboBox"
                myValuesList: [
                    ListElement { value: "11" },
                    ListElement { value: "10" },
                    ListElement { value: "9" },
                    ListElement { value: "8" },
                    ListElement { value: "7" },
                    ListElement { value: "6" },
                    ListElement { value: "5" },
                    ListElement { value: "4" },
                    ListElement { value: "3" },
                    ListElement { value: "2" },
                    ListElement { value: "1" }
                ]
                myValue: ""
                myValueIsIndex: false
            }

当 ListView 组件完成后，我从名为“Config”的 C++ 类中读取了一些配置值。

            Component.onCompleted: {
                //set Config Values from config file
                createLocalGameViewModel.setProperty(0, "myValue", Config.readConfigIntString("NumberOfPlayers"));
                createLocalGameViewModel.setProperty(1, "myValue", Config.readConfigIntString("StartCash"));
                createLocalGameViewModel.setProperty(2, "myValue", Config.readConfigIntString("FirstSmallBlind"));
                createLocalGameViewModel.setProperty(3, "myRaiseOnHandsType", Config.readConfigIntString("RaiseBlindsAtHands"));
                createLocalGameViewModel.setProperty(3, "myRaiseOnHandsInterval", Config.readConfigIntString("RaiseSmallBlindEveryHands"));
                createLocalGameViewModel.setProperty(3, "myRaiseOnMinutesInterval", Config.readConfigIntString("RaiseSmallBlindEveryMinutes"));
                createLocalGameViewModel.setProperty(4, "myAlwaysDoubleBlinds", Config.readConfigIntString("AlwaysDoubleBlinds"));

                var tempList = Config.readConfigIntStringList("ManualBlindsList");
                for(var i=0; i < tempList.length; i++) {
                    createLocalGameViewModel.get(4).myManualBlindsList.append({"blindValue": tempList[i].toString()})
                }

                createLocalGameViewModel.setProperty(4, "myAfterMBAlwaysDoubleBlinds", Config.readConfigIntString("AfterMBAlwaysDoubleBlinds"));
                createLocalGameViewModel.setProperty(4, "myAfterMBAlwaysRaiseAbout", Config.readConfigIntString("AfterMBAlwaysRaiseAbout"));
                createLocalGameViewModel.setProperty(4, "myAfterMBAlwaysRaiseValue", Config.readConfigIntString("AfterMBAlwaysRaiseValue"));
                createLocalGameViewModel.setProperty(4, "myAfterMBStayAtLastBlind", Config.readConfigIntString("AfterMBStayAtLastBlind"));
                createLocalGameViewModel.setProperty(5, "myValue", Config.readConfigIntString("GameSpeed"));
            }

当 listView 完成后，我需要将编辑后的数据传递给 C++。所以我意识到这不是在 QML 中构建模型的最佳方式。所以我打算用 C++ 创建模型，但我以前从未这样做过。所以我的问题是:哪种模型结构最适合这个用例，但设置起来不会太复杂？

或者是否有另一种不太难看的方法将数据从 QML 模型放入 C++ 上下文？

Answer 1

似乎是在使用 QQmlListProperty，如 http://doc.qt.io/qt-5/qtqml-cppintegration-exposecppattributes.html#properties-with-object-list-types 中所述很适合您的模型。

如果您碰巧还在使用 Qt 4.8，您自己的 QObject 派生类的 QList 可能也可以工作。有关这方面的更多信息，请参见:http://doc.qt.io/qt-4.8/qdeclarativemodels.html#c-data-models .