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/usr/share/plasma/plasmoids/org.kde.plasma.printmanager/contents/ui/PopupDialog.qml is in print-manager 4:15.12.3-0ubuntu1.

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/*
 *   Copyright 2012-2013 Daniel Nicoletti <dantti12@gmail.com>
 *   Copyright 2014-2015 Jan Grulich <jgrulich@redhat.com>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as
 *   published by the Free Software Foundation; either version 2 or
 *   (at your option) any later version.
 *
 *   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 Library General Public
 *   License along with this program; if not, write to the
 *   Free Software Foundation, Inc.,
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

import QtQuick 2.2
import QtQuick.Controls 1.3
import org.kde.plasma.extras 2.0 as PlasmaExtras
import org.kde.plasma.components 2.0 as PlasmaComponents
import org.kde.plasma.printmanager 0.2 as PrintManager

FocusScope {
    id: dialog

    property bool scrollBarVisible: printersView.contentHeight > scrollArea.height
    property bool searchBarVisible: scrollBarVisible || searchBar.text.length !== 0
    property string printersModelError: ""
    property alias serverUnavailable: printersModel.serverUnavailable

    state: "NO_PRINTER"

    TextField {
        id: searchBar

        anchors {
            left: parent.left
            right: parent.right
            top: parent.top
            rightMargin: Math.round(units.gridUnit / 2)
        }

        visible: searchBarVisible
        placeholderText: i18n("Search for a printer...")

        onTextChanged: {
            printersFilterModel.setFilterWildcard(text)
        }
    }

    PrintManager.PrinterSortFilterModel {
        id: printersFilterModel
        sourceModel: PrintManager.PrinterModel {
            id: printersModel
            onCountChanged: updatePrinterStatus()
            onError: printersModelError = errorTitle
        }
    }

    PlasmaExtras.ScrollArea {
        id: scrollArea
        anchors {
            bottom: parent.bottom
            left: parent.left
            right: parent.right
            top: searchBarVisible ? searchBar.bottom : parent.top
            topMargin: Math.round(units.gridUnit / 2)
        }

        ListView {
            id: printersView

            property int currentExpanded: -1

            anchors.fill: parent
            opacity: 0
            focus: true
            currentIndex: -1
            clip: true
            model: printersFilterModel
            onCountChanged: updatePrinterStatus()
            highlight: PlasmaComponents.Highlight{ }
            delegate: PrinterItem { }
        }
    }

    StatusView {
        id: statusNoPrinter
        anchors.fill: parent
        opacity: 0
        iconName: serverUnavailable ? "dialog-error" : "dialog-information"
        title: serverUnavailable ?
                   printersModelError :
                   i18n("No printers have been configured or discovered")
    }

    states: [
        State {
            name: "NO_PRINTER"
            PropertyChanges { target: statusNoPrinter; opacity: 1 }
            PropertyChanges { target: printmanager; tooltipText: statusNoPrinter.title }
        },
        State {
            name: "JOBS_PRINTER"
            PropertyChanges { target: printersView; opacity: 1 }
            PropertyChanges { target: printmanager; tooltipText: jobsTooltipText }
        }
    ]

    function updatePrinterStatus() {
        var printersFilterCount = printersFilterModel.count
        if (printersFilterCount >= 1) {
            dialog.state = "JOBS_PRINTER"
        } else {
            dialog.state = "NO_PRINTER"
        }
    }
}