// An expander: collapses to zero height and animates open, GNOME-style.
//
// The child is measured at its natural size and the *section* animates; the
// child itself never re-layouts, so opening a 20-row wifi list costs one
// height animation rather than twenty.

import QtQuick
import qs.config

Item {
    id: root

    property bool expanded: false
    default property alias content: holder.data

    clip: true
    // Column/ColumnLayout skip invisible children, so this also collapses the
    // surrounding spacing when closed.
    visible: implicitHeight > 0

    implicitHeight: root.expanded ? holder.implicitHeight : 0

    Behavior on implicitHeight {
        NumberAnimation {
            duration: Theme.durNormal
            easing.type: Easing.OutCubic
        }
    }

    Item {
        id: holder
        anchors.left: parent.left
        anchors.right: parent.right
        anchors.top: parent.top
        implicitHeight: childrenRect.height
        height: implicitHeight
    }
}