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/*
 *   Copyright 2016 Marco Martin <mart@kde.org>
 *
 *   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 Library 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 2.1
import QtQuick.Controls 2.0 as Controls

import org.kde.kirigami 2.2

Controls.ToolButton {
    id: button
    anchors {
        top: parent.top
        bottom: parent.bottom
        margins: 4
        left: parent.left
    }
    width: visible ? height : 0
    z: 99
    enabled: !Settings.isMobile && (__appWindow.pageStack.currentIndex > 0 || applicationWindow().pageStack.contentItem.contentX > 0)
    implicitWidth: height
    visible: applicationWindow().pageStack.contentItem.contentWidth > applicationWindow().pageStack.width

    onClicked: {
        if (applicationWindow().pageStack.layers && applicationWindow().pageStack.layers.depth > 1) {
            applicationWindow().pageStack.layers.pop();
        } else {
            applicationWindow().pageStack.goBack();
        }
    }
    Icon {
        anchors.centerIn: parent
        width: Math.min(parent.width, Units.iconSizes.smallMedium)
        height: width
        opacity: parent.enabled ? 1 : 0.6
        selected: header.background && header.background.color && header.background.color == Theme.highlightColor
        source: (LayoutMirroring.enabled ? "go-previous-symbolic-rtl" : "go-previous-symbolic")
    }
    Controls.ToolTip {
        visible: button.hovered
        text: qsTr("Navigate Back")
        delay: 1000
        timeout: 5000
        y: button.height
    }
}