Added an editable item delegate. Only Factor plus/minus button are working for now. (based on https://doc.qt.io/qt-6/qtquick-views-example.html as well)

Icons not working yet!

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+
+set(TARGET_APP "GenericQMLApp")
+project(${TARGET_APP} VERSION 0.1.0 LANGUAGES CXX)
+
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(Qt6 REQUIRED COMPONENTS Quick)
+
+qt_standard_project_setup(REQUIRES 6.8)
+
+qt_add_executable(${TARGET_APP}
+    main.cpp
+)
+
+qt_add_qml_module(${TARGET_APP}
+    URI GenericQML
+    QML_FILES
+        Main.qml
+        ListPage.qml
+        ListItemDelegate.qml
+        ExpandableItemDelegate.qml
+        EditableItemDelegate.qml
+        controls/PressAndHoldButton.qml
+    RESOURCES
+        icons/software-application.png
+        icons/moreUp.png icons/moreDown.png
+        icons/arrow-down.png icons/arrow-up.png
+        icons/list-delete.png
+        icons/minus-sign.png icons/plus-sign.png
+)
+
+# Qt for iOS sets MACOSX_BUNDLE_GUI_IDENTIFIER automatically since Qt 6.1.
+# If you are developing for iOS or macOS you should consider setting an
+# explicit, fixed bundle identifier manually though.
+set_target_properties(${TARGET_APP} PROPERTIES
+#    MACOSX_BUNDLE_GUI_IDENTIFIER com.example.${TARGET_APP}
+    MACOSX_BUNDLE_BUNDLE_VERSION ${PROJECT_VERSION}
+    MACOSX_BUNDLE_SHORT_VERSION_STRING ${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}
+    MACOSX_BUNDLE TRUE
+    WIN32_EXECUTABLE TRUE
+)
+
+target_include_directories(${TARGET_APP} PRIVATE ${CORE_LIB_DIR}/)
+target_link_libraries(${TARGET_APP} PRIVATE GenericCore)
+
+target_link_libraries(${TARGET_APP}
+    PRIVATE Qt6::Quick
+)
+
+include(GNUInstallDirs)
+install(TARGETS ${TARGET_APP}
+    BUNDLE DESTINATION .
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)

EditableItemDelegate.qml

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+import QtQuick
+
+import "controls"
+
+Item {
+    //! [0]
+    id: delegateItem
+    width: listView.width
+    height: 80
+    clip: true
+
+    required property int index
+
+    // required property string edit
+    // required property QtObject model
+    required property string name
+    required property string description
+    required property string info
+    required property int amount
+    required property real factor
+
+    Rectangle {
+        id: background
+        x: 2
+        y: 2
+        width: parent.width - x * 2
+        height: parent.height - y * 2
+        color: wccDarkLight
+        border.color: index === listView.currentIndex ? "blue" : wccDarkDefault
+        border.width: 3
+        radius: 5
+    }
+
+    Column {
+        id: arrows
+        anchors {
+            left: parent.left
+            verticalCenter: parent.verticalCenter
+        }
+        Image {
+            source: "icons/arrow-up.png"
+            MouseArea {
+                anchors.fill: parent
+                // onClicked: fruitModel.move(delegateItem.index,
+                //                            delegateItem.index - 1, 1)
+            }
+        }
+        Image {
+            source: "icons/arrow-down.png"
+            MouseArea {
+                anchors.fill: parent
+                // onClicked: fruitModel.move(delegateItem.index,
+                //                            delegateItem.index + 1, 1)
+            }
+        }
+    }
+
+    Column {
+        anchors {
+            left: arrows.right
+            horizontalCenter: parent.horizontalCenter
+            bottom: parent.verticalCenter
+        }
+
+        Text {
+            anchors.horizontalCenter: parent.horizontalCenter
+            text: delegateItem.name
+            font.pixelSize: 15
+            color: "white"
+        }
+        Text {
+            text: delegateItem.description
+            color: "White"
+        }
+    }
+
+    Item {
+        anchors {
+            left: arrows.right
+            horizontalCenter: parent.horizontalCenter
+            top: parent.verticalCenter
+            bottom: parent.bottom
+        }
+
+        Row {
+            anchors.centerIn: parent
+            spacing: 10
+
+            PressAndHoldButton {
+                anchors.verticalCenter: parent.verticalCenter
+                source: "icons/plus-sign.png"
+                onClicked: delegateItem.factor = delegateItem.factor + 0.25
+            }
+
+            Text {
+                id: factorText
+                anchors.verticalCenter: parent.verticalCenter
+                text: 'Factor: ' + Number(delegateItem.factor).toFixed(2)
+                font.pixelSize: 15
+                color: "white"
+                font.bold: true
+            }
+
+            PressAndHoldButton {
+                anchors.verticalCenter: parent.verticalCenter
+                source: "icons/minus-sign.png"
+                onClicked: delegateItem.factor = Math.max(
+                               0, delegateItem.factor - 0.25)
+            }
+
+            Image {
+                source: "icons/list-delete.png"
+                MouseArea {
+                    anchors.fill: parent
+                    onClicked: fruitModel.remove(delegateItem.index)
+                }
+            }
+        }
+    }
+
+    // Animate adding and removing of items:
+    //! [1]
+    SequentialAnimation {
+        id: addAnimation
+        PropertyAction {
+            target: delegateItem
+            property: "height"
+            value: 0
+        }
+        NumberAnimation {
+            target: delegateItem
+            property: "height"
+            to: 80
+            duration: 250
+            easing.type: Easing.InOutQuad
+        }
+    }
+    ListView.onAdd: addAnimation.start()
+
+    SequentialAnimation {
+        id: removeAnimation
+        PropertyAction {
+            target: delegateItem
+            property: "ListView.delayRemove"
+            value: true
+        }
+        NumberAnimation {
+            target: delegateItem
+            property: "height"
+            to: 0
+            duration: 250
+            easing.type: Easing.InOutQuad
+        }
+
+        // Make sure delayRemove is set back to false so that the item can be destroyed
+        PropertyAction {
+            target: delegateItem
+            property: "ListView.delayRemove"
+            value: false
+        }
+    }
+    ListView.onRemove: removeAnimation.start()
+}

ExpandableItemDelegate.qml

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+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+
+Item {
+    id: item
+
+    required property int index
+    required property string name
+    required property string description
+    required property string info
+    required property int amount
+    required property real factor
+
+    property real detailsOpacity: 0
+    width: ListView.view.width
+    height: 70
+
+    Rectangle {
+        id: background
+        x: 2
+        y: 2
+        width: parent.width - x * 2
+        height: parent.height - y * 2
+        color: wccDarkLight
+        border.color: index === listView.currentIndex ? "blue" : wccDarkDefault
+        border.width: 3
+        radius: 5
+    }
+
+    MouseArea {
+        anchors.fill: parent
+        acceptedButtons: Qt.LeftButton | Qt.RightButton
+        onClicked: mouse => {
+                       parent.ListView.view.currentIndex = parent.index
+                       if (mouse.button === Qt.RightButton) {
+                           item.state = 'Details'
+                       }
+                   }
+    }
+
+    Row {
+        id: topLayout
+        x: 10
+        y: 10
+        height: icon.height
+        width: parent.width
+        spacing: 10
+
+        Image {
+            id: icon
+            width: 50
+            height: 50
+            source: "icons/software-application.png"
+        }
+
+        Column {
+            width: background.width - icon.width - 20
+            height: icon.height
+            spacing: 5
+
+            Text {
+                text: item.name
+                font.bold: true
+                font.pointSize: 16
+            }
+
+            Text {
+                text: qsTr("Details")
+                font.bold: true
+                font.pointSize: 9
+                opacity: item.detailsOpacity
+            }
+
+            Text {
+                text: item.description
+                wrapMode: Text.WordWrap
+                width: parent.width
+                font.pointSize: 9
+                opacity: item.detailsOpacity
+            }
+        }
+    }
+
+    Item {
+        id: details
+        x: 10
+        width: parent.width - 20
+
+        anchors {
+            top: topLayout.bottom
+            topMargin: 10
+            bottom: parent.bottom
+            bottomMargin: 10
+        }
+        opacity: item.detailsOpacity
+        Text {
+            id: moreInfoTitle
+            anchors.top: parent.top
+            text: qsTr("Further information")
+            font.pointSize: 9
+            font.bold: true
+        }
+
+        Flickable {
+            id: flick
+            width: parent.width
+            anchors {
+                top: moreInfoTitle.bottom
+                bottom: parent.bottom
+            }
+            contentHeight: infoText.height
+            clip: true
+
+            ColumnLayout {
+                Text {
+                    id: infoText
+                    text: item.info
+                    wrapMode: Text.WordWrap
+                    width: details.width
+                }
+                Text {
+                    id: amountText
+                    text: "Amount: " + item.amount
+                    wrapMode: Text.WordWrap
+                    width: details.width
+                }
+                Text {
+                    id: factorText
+                    text: "Factor: " + item.factor
+                    wrapMode: Text.WordWrap
+                    width: details.width
+                }
+            }
+        }
+
+        Image {
+            anchors {
+                right: flick.right
+                top: flick.top
+            }
+            source: "icons/moreUp.png"
+            opacity: flick.atYBeginning ? 0 : 1
+        }
+
+        Image {
+            anchors {
+                right: flick.right
+                bottom: flick.bottom
+            }
+
+            source: "icons/moreDown.png"
+            opacity: flick.atYEnd ? 0 : 1
+        }
+    }
+
+    Button {
+        y: 10
+        anchors {
+            right: background.right
+            rightMargin: 10
+        }
+        opacity: item.detailsOpacity
+        text: qsTr("Close")
+
+        onClicked: item.state = ''
+    }
+
+    states: State {
+        name: "Details"
+
+        PropertyChanges {
+            background.color: "white"
+            icon {
+                // Make picture bigger
+                width: 130
+                height: 130
+            }
+            item {
+                // Make details visible
+                detailsOpacity: 1
+                x: 0
+
+                // Fill the entire list area with the detailed view
+                height: listView.height
+            }
+        }
+
+        // Move the list so that this item is at the top.
+        PropertyChanges {
+            item.ListView.view.contentY: item.y
+            explicit: true
+        }
+
+        // Disallow flicking while we're in detailed view
+        PropertyChanges {
+            item.ListView.view.interactive: false
+        }
+    }
+
+    transitions: Transition {
+        // Make the state changes smooth
+        ParallelAnimation {
+            ColorAnimation {
+                property: "color"
+                duration: 500
+            }
+            NumberAnimation {
+                duration: 300
+                properties: "detailsOpacity,x,contentY,height,width"
+            }
+        }
+    }
+}

ListItemDelegate.qml

@@ -0,0 +1,24 @@
+import QtQuick
+
+Item {
+    id: myItem
+    required property int index
+    required property string name
+    required property string info
+    property int fontSize: 16
+
+    width: parent.width
+    height: 40
+    Column {
+        Text {
+            text: '<b>Name:</b> ' + myItem.name
+        }
+        Text {
+            text: '<b>Info:</b> ' + myItem.info
+        }
+    }
+    MouseArea {
+        anchors.fill: parent
+        onClicked: parent.ListView.view.currentIndex = parent.index
+    }
+}

ListPage.qml

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+import QtQuick
+import QtQuick.Layouts
+import QtQuick.Controls.Material
+
+Page {
+    id: page
+
+    ListView {
+        id: listView
+        anchors.fill: parent
+        focus: true
+        clip: true
+
+        model: mainModel
+        delegateModelAccess: DelegateModel.ReadWrite
+
+        // delegate: ListItemDelegate {}
+        // delegate: ExpandableItemDelegate {}
+        delegate: EditableItemDelegate {}
+
+        header: bannercomponent
+        footer: Rectangle {
+            width: parent.width
+            height: 30
+            gradient: mainGradient
+        }
+    }
+
+    Component {
+        //instantiated when header is processed
+        id: bannercomponent
+        Rectangle {
+            id: banner
+            width: parent.width
+            height: 50
+            gradient: mainGradient
+            border {
+                color: wccPurpleDark
+                width: 2
+            }
+            Text {
+                anchors.centerIn: parent
+                text: window.title
+                font.pixelSize: 32
+                color: wccDarkLight
+            }
+        }
+    }
+
+    Gradient {
+        id: mainGradient
+        GradientStop {
+            position: 0.0
+            color: wccPurpleDefault
+        }
+        GradientStop {
+            position: 0.66
+            color: wccPurpleDark
+        }
+    }
+}

Main.qml

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+import QtQuick
+import QtQuick.Layouts
+import QtQml.Models
+
+Window {
+    id: window
+    width: 480
+    height: 800
+    visible: true
+    title: `${Application.name}`
+
+    property int fontSize: 16
+
+    property color textColor: "black"
+
+    property color wccDarkDark: "#010101"
+    property color wccDarkDefault: "#3C3B3B"
+    property color wccDarkLight: "#828282"
+
+    property color wccPurpleDark: "#631A61"
+    property color wccPurpleDefault: "#A834A5"
+    property color wccPurpleLight: "#E88FE5"
+
+    property color wccLavenderDark: "#8C52FF"
+    property color wccLavenderDefault: "#9D74EE"
+    property color wccLavenderLight: "#BC9AFF"
+
+    ListPage {
+        id: listPage
+        anchors.fill: parent
+    }
+}

controls/PressAndHoldButton.qml

@@ -0,0 +1,45 @@
+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+import QtQuick
+
+Image {
+    id: container
+
+    property int repeatDelay: 300
+    property int repeatDuration: 75
+    property bool pressed
+
+    signal clicked
+
+    scale: pressed ? 0.9 : 1
+
+    function release() {
+        autoRepeatClicks.stop()
+        container.pressed = false
+    }
+
+    SequentialAnimation on pressed {
+        id: autoRepeatClicks
+        running: false
+
+        PropertyAction { target: container; property: "pressed"; value: true }
+        ScriptAction { script: container.clicked() }
+        PauseAnimation { duration: container.repeatDelay }
+
+        SequentialAnimation {
+            loops: Animation.Infinite
+            ScriptAction { script: container.clicked() }
+            PauseAnimation { duration: container.repeatDuration }
+        }
+    }
+
+    MouseArea {
+        anchors.fill: parent
+
+        onPressed: autoRepeatClicks.start()
+        onReleased: container.release()
+        onCanceled: container.release()
+    }
+}
+

main.cpp

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+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+#include <QQmlContext>
+
+#include <model/generalsortfiltermodel.h>
+
+#include "genericcore.h"
+
+#ifdef QT_DEBUG
+#include "utils/messagehandler.h"
+#endif
+
+int main(int argc, char* argv[]) {
+#ifdef QT_DEBUG
+  qInstallMessageHandler(consoleHandlerColoredVerboseInDarkTheme);
+#endif
+
+  QGuiApplication app(argc, argv);
+  std::unique_ptr<GenericCore> core                 = std::make_unique<GenericCore>();
+  std::shared_ptr<GeneralSortFilterModel> mainModel = core->getSortFilterModel();
+
+  // qInfo() << "QMLApp Version:" << QMLAPP_VERSION;
+  qInfo() << "core->getString():" << core->toString();
+
+  QQmlApplicationEngine engine;
+  engine.rootContext()->setContextProperty(QStringLiteral("core"), core.get());
+  engine.rootContext()->setContextProperty(QStringLiteral("mainModel"), mainModel.get());
+
+  QObject::connect(
+      &engine, &QQmlApplicationEngine::objectCreationFailed, &app,
+      []() { QCoreApplication::exit(-1); }, Qt::QueuedConnection);
+  engine.loadFromModule("GenericQML", "Main");
+
+  return app.exec();
+}