qt-everywhere-src-5.14.1/qtdeclarative/examples/quick/views/delegatemodel/dragselection.qml

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import QtQuick 2.0
import QtQml.Models 2.1

Item {
    id: root

    width: 320
    height: 480

    property bool dragging: false

    Component {
        id: packageDelegate
        Package {
            id: packageRoot

            MouseArea {
                id: visibleContainer
                Package.name: "visible"

                width: 64
                height: 64
                enabled: packageRoot.DelegateModel.inSelected

                drag.target: draggable

                Item {
                    id: draggable

                    width: 64
                    height: 64

                    Drag.active: visibleContainer.drag.active

                    anchors { horizontalCenter: parent.horizontalCenter; verticalCenter: parent.verticalCenter }

                    states: State {
                        when: visibleContainer.drag.active
                        AnchorChanges { target:  draggable; anchors { horizontalCenter: undefined; verticalCenter: undefined} }
                        ParentChange { target: selectionView; parent: draggable; x: 0; y: 0 }
                        PropertyChanges { target: root; dragging: true }
                        ParentChange { target: draggable; parent: root }
                    }
                }
                DropArea {
                    anchors.fill: parent
                    onEntered: selectedItems.move(0, visualModel.items.get(packageRoot.DelegateModel.itemsIndex), selectedItems.count)
                }
            }
            Item {
                id: selectionContainer
                Package.name: "selection"

                width: 64
                height: 64

                visible: PathView.onPath
            }
            Rectangle {
                id: content
                parent: visibleContainer

                width: 58
                height: 58

                radius: 8

                gradient: Gradient {
                    GradientStop { id: gradientStart; position: 0.0; color: "#8AC953" }
                    GradientStop { id: gradientEnd; position: 1.0; color: "#8BC953" }
                }

                border.width: 2
                border.color: "#007423"

                state: root.dragging && packageRoot.DelegateModel.inSelected ? "selected" : "visible"

                Text {
                    anchors.fill: parent
                    horizontalAlignment: Text.AlignHCenter
                    verticalAlignment: Text.AlignVCenter
                    color: "white"
                    text: modelData
                    font.pixelSize: 18
                }

                Rectangle {
                    anchors { right: parent.right; top: parent.top; margins: 3 }
                    width: 12; height: 12
                    color: packageRoot.DelegateModel.inSelected ? "black" : "white"
                    radius: 6

                    border.color: "white"
                    border.width: 2

                    MouseArea {
                        anchors.fill: parent
                        onClicked: packageRoot.DelegateModel.inSelected = !packageRoot.DelegateModel.inSelected
                    }
                }

                states: [
                    State {
                        name: "selected"
                        ParentChange { target: content; parent: selectionContainer; x: 3; y: 3 }
                        PropertyChanges { target: packageRoot; DelegateModel.inItems: visibleContainer.drag.active }
                        PropertyChanges { target: gradientStart; color: "#017423" }
                        PropertyChanges { target: gradientStart; color: "#007423" }
                    }, State {
                        name: "visible"
                        PropertyChanges { target: packageRoot; DelegateModel.inItems: true }
                        ParentChange { target: content; parent: visibleContainer; x: 3; y: 3 }
                        PropertyChanges { target: gradientStart; color: "#8AC953" }
                        PropertyChanges { target: gradientStart; color: "#8BC953" }
                    }
                ]
                transitions: Transition {
                    PropertyAction { target: packageRoot; properties: "DelegateModel.inItems" }
                    ParentAnimation {
                        target: content
                        NumberAnimation { target: content; properties: "x,y"; duration: 500 }
                    }
                    ColorAnimation { targets: [gradientStart, gradientEnd]; duration: 500 }
                }
            }
        }
    }

    DelegateModel {
        id: visualModel
        model: 35
        delegate: packageDelegate

        groups: DelegateModelGroup { id: selectedItems; name: "selected" }

        Component.onCompleted:  parts.selection.filterOnGroup = "selected"
    }

    PathView {
        id: selectionView

        height: 64
        width: 64

        model: visualModel.parts.selection

        path: Path {
            startX: 0
            startY: 0
            PathLine { x: 64; y: 64 }
        }
    }

    GridView {
        id: itemsView
        anchors { fill: parent }
        cellWidth: 64
        cellHeight: 64
        model: visualModel.parts.visible
    }
}