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/usr/share/unity8/Dash/Previews/PreviewExpandable.qml is in unity8-common 8.12+16.04.20160401-0ubuntu1.

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/*
 * Copyright (C) 2014,2015 Canonical, Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import QtQuick 2.4
import Ubuntu.Components 1.3
import "../../Components"

/*! \brief Preview widget for expandable widgets.

    This widget shows a list of widgets defined in widgetData["widgets"]
    Those widgets can be collapsed or uncollapsed. When uncollapsed
    all the widgets are shown, when collapsed only the first
    widgetData["collapsed-widgets"] are shown. It has a title that comes
    in via widgetData["title"]. This widget expands all child widgets
    when initialized by specifying widgetData["expanded"] == true.
    It's in unexpanded mode by default.
 */

PreviewWidget {
    id: root
    implicitHeight: childrenRect.height

    Label {
        id: titleLabel
        objectName: "titleLabel"
        anchors {
            left: parent.left
            right: expandButton.left
        }
        fontSize: "large"
        color: root.scopeStyle ? root.scopeStyle.foreground : theme.palette.normal.baseText
        visible: text !== ""
        opacity: .8
        text: widgetData["title"] || ""
        wrapMode: Text.Wrap
    }

    AbstractButton {
        id: expandButton
        objectName: "expandButton"
        width: titleLabel.height
        height: titleLabel.height
        anchors.right: parent.right
        onClicked: {
            root.expanded = !root.expanded;
        }
        Icon {
            anchors.fill: parent
            width: units.gu(3)
            height: units.gu(3)
            name: root.expanded ? "view-collapse" : "view-expand"
            color: root.scopeStyle ? root.scopeStyle.foreground : theme.palette.normal.baseText
        }
    }

    Column {
        anchors {
            top: titleLabel.bottom
            topMargin: units.gu(1)
            left: parent.left
            right: parent.right
        }
        spacing: units.gu(1)
        Repeater {
            id: repeater
            objectName: "repeater"
            model: widgetData["widgets"]
            delegate: PreviewWidgetFactory {
                height: visible ? implicitHeight : 0
                width: parent.width
                widgetId: model.widgetId
                widgetType: model.type
                widgetData: model.properties
                scopeStyle: root.scopeStyle
                anchors {
                    left: parent.left
                    right: parent.right
                }
                expanded: root.expanded
                visible: root.expanded || index < root.widgetData["collapsed-widgets"]

                onTriggered: {
                    root.triggered(widgetId, actionId, data);
                }
                onMakeSureVisible: {
                    root.makeSureVisible(item)
                }
            }
        }
    }
}