qt-creator/share/qtcreator/qmldesigner/propertyEditorQmlSources/HelperWidgets/Section.qml

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import QtQuick 2.1
import QtQuick.Controls 1.1 as Controls
import QtQuick.Layouts 1.0

Item {

    id: section
    property alias caption: label.text

    anchors.left: parent.left
    anchors.right: parent.right
    clip: true

    Rectangle {
        id: header
        height: 18

        anchors.left: parent.left
        anchors.right: parent.right

        Controls.Label {
            id: label
            anchors.verticalCenter: parent.verticalCenter
            color: "white"
            x: 22
        }

        Image {
            source: "images/down-arrow.png"
            rotation: section.state === "Collapsed" ? -90 : 0
            anchors.left: parent.left
            anchors.leftMargin: 4
            anchors.verticalCenter: parent.verticalCenter
            Behavior on rotation {NumberAnimation{duration: 80}}
        }

        gradient: Gradient {
            GradientStop {color: '#555' ; position: 0}
            GradientStop {color: '#444' ; position: 1}
        }

        Rectangle {
            color: "#666"
            width: parent.width
            height: 1
        }

        Rectangle {
            color: "#333"
            anchors.bottom: parent.bottom
            width: parent.width
            height: 1
        }

        MouseArea {
            anchors.fill: parent
            onClicked: {
                if (section.state === "")
                    section.state = "Collapsed";
                else
                    section.state = "";
            }
        }
    }

    default property alias __content: row.data

    readonly property alias contentItem: row

    implicitHeight: Math.round(row.height + header.height + 8)

    Row {
        width: parent.width
        x: 8
        y: header.height + 4
        id: row
    }

    Behavior on height { NumberAnimation{easing.type: Easing.OutCubic ; duration: 60} }

    states: [
        State {
            name: "Collapsed"
            PropertyChanges {
                target: section
                height: header.height
            }
        }
    ]

}