qt-everywhere-src-5.15.1/qtdeclarative/examples/quick/draganddrop/views/gridview.qml

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import QtQml 2.14
import QtQuick 2.14
import QtQml.Models 2.14

GridView {
    id: root
    width: 320; height: 480
    cellWidth: 80; cellHeight: 80

    displaced: Transition {
        NumberAnimation { properties: "x,y"; easing.type: Easing.OutQuad }
    }

//! [0]
    model: DelegateModel {
//! [0]
        id: visualModel
        model: ListModel {
            id: colorModel
            ListElement { color: "blue" }
            ListElement { color: "green" }
            ListElement { color: "red" }
            ListElement { color: "yellow" }
            ListElement { color: "orange" }
            ListElement { color: "purple" }
            ListElement { color: "cyan" }
            ListElement { color: "magenta" }
            ListElement { color: "chartreuse" }
            ListElement { color: "aquamarine" }
            ListElement { color: "indigo" }
            ListElement { color: "black" }
            ListElement { color: "lightsteelblue" }
            ListElement { color: "violet" }
            ListElement { color: "grey" }
            ListElement { color: "springgreen" }
            ListElement { color: "salmon" }
            ListElement { color: "blanchedalmond" }
            ListElement { color: "forestgreen" }
            ListElement { color: "pink" }
            ListElement { color: "navy" }
            ListElement { color: "goldenrod" }
            ListElement { color: "crimson" }
            ListElement { color: "teal" }
        }
//! [1]
        delegate: DropArea {
            id: delegateRoot
            required property color color;

            width: 80; height: 80

            onEntered: function(drag) {
                visualModel.items.move((drag.source as Icon).visualIndex, icon.visualIndex)
            }

            property int visualIndex: DelegateModel.itemsIndex

            Icon {
                id: icon
                dragParent: root
                visualIndex: delegateRoot.visualIndex
                color: delegateRoot.color
            }
        }
//! [1]
    }
}