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

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/*
 * Copyright (C) 2014 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

Button {
    signal triggeredAction(var actionData)

    property var data: null
    objectName: "button" + (data && data.id || "")
    text: data && data.label || ""
    onClicked: triggeredAction(data)
}