Warning, /plasma/libplasma/tests/extras/expandablelistitem.qml is written in an unsupported language. File is not indexed.

 import QtQuick
 import QtQuick.Layouts
 
 import QtQml.Models
 import org.kde.plasma.extras as PlasmaExtras
 import org.kde.plasma.components as PlasmaComponents
 import org.kde.kirigami as Kirigami
 
 Rectangle {
     height: 800
     width: 500
     color: Kirigami.Theme.backgroundColor
     PlasmaComponents.ScrollView {
         anchors.fill: parent
         ListView {
             anchors.fill: parent
             focus: true
             currentIndex: -1
             clip: true
             model: myModel
             highlight: PlasmaExtras.Highlight {}
             highlightMoveDuration: Kirigami.Units.longDuration
             highlightResizeDuration: Kirigami.Units.longDuration
             delegate: PlasmaExtras.ExpandableListItem {
                 title: model.title
                 subtitle: model.subtitle
                 icon: model.icon
                 isBusy: model.busy
                 subtitleCanWrap: model.subtitleCanWrap || false
 
                 customExpandedViewContent: Component {
                     ColumnLayout {
                         PlasmaComponents.Label {
                             text: "I am some expanded text"
                         }
                         PlasmaComponents.Button {
                             text: "with an expanded button"
                         }
                     }
                 }
             }
         }
     }
 
     ListModel {
         id: myModel
         ListElement {
             title: "Item 1"
             subtitle: "Default with icon"
             icon: "system-file-manager"
             isDefault: true
         }
         ListElement {
             title: "Item 2"
             subtitle: "A really long subtitle that probably won't fit in this constrained example because of how long it is."
             isDefault: false
         }
         ListElement {
             title: "Item 4"
             subtitle: "Busy"
             isDefault: false
             busy: true
         }
 
     }
 }