- Qt 5.5
- Qt Quick
- Qt Quick Examples - Views
- dynamiclist.qml Example File
- Qt 5.5.1 Reference Documentation

# dynamiclist.qml Example File

views/listview/dynamiclist.qml

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
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    ** This file is part of the examples of the Qt Toolkit.
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    import QtQuick 2.0
    import "content"

    // This example shows how items can be dynamically added to and removed from
    // a ListModel, and how these list modifications can be animated.

    Rectangle {
        id: container
        width: 500; height: 400
        color: "#343434"

        // The model:
        ListModel {
            id: fruitModel

            ListElement {
                name: "Apple"; cost: 2.45
                attributes: [
                    ListElement { description: "Core" },
                    ListElement { description: "Deciduous" }
                ]
            }
            ListElement {
                name: "Banana"; cost: 1.95
                attributes: [
                    ListElement { description: "Tropical" },
                    ListElement { description: "Seedless" }
                ]
            }
            ListElement {
                name: "Cumquat"; cost: 3.25
                attributes: [
                    ListElement { description: "Citrus" }
                ]
            }
            ListElement {
                name: "Durian"; cost: 9.95
                attributes: [
                    ListElement { description: "Tropical" },
                    ListElement { description: "Smelly" }
                ]
            }
        }

        // The delegate for each fruit in the model:
        Component {
            id: listDelegate
            Item {
                id: delegateItem
                width: listView.width; height: 80
                clip: true

                Column {
                    id: arrows
                    anchors {
                        left: parent.left
                        verticalCenter: parent.verticalCenter
                    }
                    Image {
                        source: "content/pics/arrow-up.png"
                        MouseArea { anchors.fill: parent; onClicked: fruitModel.move(index, index-1, 1) }
                    }
                    Image { source: "content/pics/arrow-down.png"
                        MouseArea { anchors.fill: parent; onClicked: fruitModel.move(index, index+1, 1) }
                    }
                }

                Column {
                    anchors {
                        left: arrows.right
                        horizontalCenter: parent.horizontalCenter;
                        bottom: parent.verticalCenter
                    }

                    Text {
                        anchors.horizontalCenter: parent.horizontalCenter
                        text: name
                        font.pixelSize: 15
                        color: "white"
                    }
                    Row {
                        anchors.horizontalCenter: parent.horizontalCenter
                        spacing: 5
                        Repeater {
                            model: attributes
                            Text { text: 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: "content/pics/plus-sign.png"
                            onClicked: fruitModel.setProperty(index, "cost", cost + 0.25)
                        }

                        Text {
                            id: costText
                            anchors.verticalCenter: parent.verticalCenter
                            text: '$' + Number(cost).toFixed(2)
                            font.pixelSize: 15
                            color: "white"
                            font.bold: true
                        }

                        PressAndHoldButton {
                            anchors.verticalCenter: parent.verticalCenter
                            source: "content/pics/minus-sign.png"
                            onClicked: fruitModel.setProperty(index, "cost", Math.max(0,cost-0.25))
                        }

                        Image {
                            source: "content/pics/list-delete.png"
                            MouseArea { anchors.fill:parent; onClicked: fruitModel.remove(index) }
                        }
                    }
                }

                // Animate adding and removing of items:
                ListView.onAdd: SequentialAnimation {
                    PropertyAction { target: delegateItem; property: "height"; value: 0 }
                    NumberAnimation { target: delegateItem; property: "height"; to: 80; duration: 250; easing.type: Easing.InOutQuad }
                }

                ListView.onRemove: SequentialAnimation {
                    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 }
                }
            }
        }

        // The view:
        ListView {
            id: listView
            anchors {
                left: parent.left; top: parent.top;
                right: parent.right; bottom: buttons.top;
                margins: 20
            }
            model: fruitModel
            delegate: listDelegate
        }

        Row {
            id: buttons
            anchors { left: parent.left; bottom: parent.bottom; margins: 20 }
            spacing: 10

            TextButton {
                text: "Add an item"
                onClicked: {
                    fruitModel.append({
                        "name": "Pizza Margarita",
                        "cost": 5.95,
                        "attributes": [{"description": "Cheese"}, {"description": "Tomato"}]
                    })
                }
            }

            TextButton {
                text: "Remove all items"
                onClicked: fruitModel.clear()
            }
        }
    }