Qt Quick Controls 2 - Swipe to Remove

This example demonstrates how SwipeDelegate can be used to implement removal of list items by swipe. This UI pattern is often used in touch user interfaces.

Each list item can be swiped to the left, which reveals a label on the right side indicating that the item will be removed if the swipe is completed. The following snippet contains the implementation of the side item.

swipe.right: Rectangle {
    width: parent.width
    height: parent.height
    clip: true
    color: SwipeDelegate.pressed ? "#555" : "#666"
    Label {
        font.family: "Fontello"
        text: delegate.swipe.complete ? "\ue805" // icon-cw-circled
                                      : "\ue801" // icon-cancel-circled-1
        padding: 20
        anchors.fill: parent
        horizontalAlignment: Qt.AlignRight
        verticalAlignment: Qt.AlignVCenter
        opacity: 2 * -delegate.swipe.position
        color: Material.color(delegate.swipe.complete ? Material.Green : Material.Red, Material.Shade200)
        Behavior on color { ColorAnimation { } }
    }
    Label {
        text: qsTr("Removed")
        color: "white"
        padding: 20
        anchors.fill: parent
        horizontalAlignment: Qt.AlignLeft
        verticalAlignment: Qt.AlignVCenter
        opacity: delegate.swipe.complete ? 1 : 0
        Behavior on opacity { NumberAnimation { } }
    }
    SwipeDelegate.onClicked: delegate.swipe.close()
    SwipeDelegate.onPressedChanged: undoTimer.stop()
}

The following snippet presents how the logic of removing items is implemented. When the swipe is completed , it starts a timer tha waits a few seconds to let the user undo the remove action. Once the undo timer triggers, the item is removed from the list:

Timer {
    id: undoTimer
    interval: 3600
    onTriggered: listModel.remove(index)
}
swipe.onCompleted: undoTimer.start()

Finally, the removal of an item triggers the following transitions. The remove transition applies to the item that is removed, and the displaced transition applies to the other items that got displaced due to the removal:

remove: Transition {
    SequentialAnimation {
        PauseAnimation { duration: 125 }
        NumberAnimation { property: "height"; to: 0; easing.type: Easing.InOutQuad }
    }
}
displaced: Transition {
    SequentialAnimation {
        PauseAnimation { duration: 125 }
        NumberAnimation { property: "y"; easing.type: Easing.InOutQuad }
    }
}

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