Qt Documentation

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Qt Quick Examples - Drag and Drop

Drag and Drop is a collection of small QML examples relating to the drag and drop functionality. For more information, visit the Drag and Drop page.

Running the Example

To run the example from Qt Creator, open the Welcome mode and select the example from Examples. For more information, visit Building and Running an Example.

Tiles

Tiles adds drag and drop to simple rectangles, which you can drag into a specific grid.

It has a DragTile component which uses a MouseArea to move an item when dragged:

Item {
    id: root
    property string colorKey

    width: 64; height: 64

    MouseArea {
        id: mouseArea

        width: 64; height: 64
        anchors.centerIn: parent

        drag.target: tile

        onReleased: parent = tile.Drag.target !== null ? tile.Drag.target : root

        Rectangle {
            id: tile

            width: 64; height: 64
            anchors.verticalCenter: parent.verticalCenter
            anchors.horizontalCenter: parent.horizontalCenter

            color: colorKey

            Drag.keys: [ colorKey ]
            Drag.active: mouseArea.drag.active
            Drag.hotSpot.x: 32
            Drag.hotSpot.y: 32
            states: State {
                when: mouseArea.drag.active
                ParentChange { target: tile; parent: root }
                AnchorChanges { target: tile; anchors.verticalCenter: undefined; anchors.horizontalCenter: undefined }
            }

        }
    }
}

And a DropTile component on which the dragged tiles can be dropped:

DropArea {
    id: dragTarget

    property string colorKey
    property alias dropProxy: dragTarget

    width: 64; height: 64
    keys: [ colorKey ]

    Rectangle {
        id: dropRectangle

        anchors.fill: parent
        color: colorKey

        states: [
            State {
                when: dragTarget.containsDrag
                PropertyChanges {
                    target: dropRectangle
                    color: "grey"
                }
            }
        ]
    }
}

The keys property of the DropArea will only allow an item to be dropped on it if it has a matching key in its Drag.keys property.

GridView Example

The GridView Example adds drag and drop to a GridView, allowing you to reorder the list. It also uses a DelegateModel to move a delegate item to the position of another item it is dragged over.

    model: DelegateModel {
        delegate: MouseArea {
            id: delegateRoot

            property int visualIndex: DelegateModel.itemsIndex

            width: 80; height: 80
            drag.target: icon

            Rectangle {
                id: icon
                width: 72; height: 72
                anchors {
                    horizontalCenter: parent.horizontalCenter;
                    verticalCenter: parent.verticalCenter
                }
                color: model.color
                radius: 3

                Drag.active: delegateRoot.drag.active
                Drag.source: delegateRoot
                Drag.hotSpot.x: 36
                Drag.hotSpot.y: 36

                states: [
                    State {
                        when: icon.Drag.active
                        ParentChange {
                            target: icon
                            parent: root
                        }

                        AnchorChanges {
                            target: icon;
                            anchors.horizontalCenter: undefined;
                            anchors.verticalCenter: undefined
                        }
                    }
                ]
            }

            DropArea {
                anchors { fill: parent; margins: 15 }

                onEntered: visualModel.items.move(drag.source.visualIndex, delegateRoot.visualIndex)
            }
        }

Files:

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