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+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Extras module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+import QtQuick 2.2
+import QtQuick.Controls 1.2
+import QtQuick.Controls.Private 1.0
+
+/*!
+    \qmltype TumblerColumn
+    \inqmlmodule QtQuick.Extras
+    \since QtQuick.Extras 1.2
+    \ingroup extras
+    \brief A column within a tumbler.
+
+    \note TumblerColumn requires Qt 5.3.2 or later.
+
+    TumblerColumn represents a column within a tumbler, providing the interface
+    to define the items and width of each column.
+
+    \code
+    Tumbler {
+        TumblerColumn {
+            model: [1, 2, 3]
+        }
+
+        TumblerColumn {
+            model: ["A", "B", "C"]
+            visible: false
+        }
+    }
+    \endcode
+
+    You can create a custom appearance for a Tumbler by assigning a
+    \l {QtQuick.Extras.Styles::}{TumblerStyle}.
+*/
+
+QtObject {
+    id: tumblerColumn
+
+    /*! \internal */
+    property Item __tumbler: null
+
+    /*!
+        \internal
+
+        The index of this column within the tumbler.
+    */
+    property int __index: -1
+
+    /*!
+        \internal
+
+        The index of the current item, if the PathView has items instantiated,
+        or the last current index if it doesn't.
+    */
+    property int __currentIndex: -1
+
+    Accessible.role: Accessible.ColumnHeader
+
+    /*!
+        \qmlproperty readonly int TumblerColumn::currentIndex
+
+        This read-only property holds the index of the current item for this
+        column. If the model count is reduced, the current index will be
+        reduced to the new count minus one.
+
+        \sa {Tumbler::currentIndexAt}, {Tumbler::setCurrentIndexAt}
+    */
+    readonly property alias currentIndex: tumblerColumn.__currentIndex
+
+    /*!
+        This property holds the model that provides data for this column.
+    */
+    property var model: null
+
+    /*!
+        This property holds the model role of this column.
+    */
+    property string role: ""
+
+    /*!
+        The item delegate for this column.
+
+        If set, this delegate will be used to display items in this column,
+        instead of the
+        \l {QtQuick.Extras.Styles::TumblerStyle::delegate}{delegate}
+        property in \l {QtQuick.Extras.Styles::}{TumblerStyle}.
+
+        The \l {Item::implicitHeight}{implicitHeight} property must be set,
+        and it must be the same for each delegate.
+    */
+    property Component delegate
+
+    /*!
+        The highlight delegate for this column.
+
+        If set, this highlight will be used to display the highlight in this
+        column, instead of the
+        \l {QtQuick.Extras.Styles::TumblerStyle::highlight}{highlight}
+        property in \l {QtQuick.Extras.Styles::}{TumblerStyle}.
+    */
+    property Component highlight
+
+    /*!
+        The foreground of this column.
+
+        If set, this component will be used to display the foreground in this
+        column, instead of the
+        \l {QtQuick.Extras.Styles::TumblerStyle::columnForeground}{columnForeground}
+        property in \l {QtQuick.Extras.Styles::}{TumblerStyle}.
+    */
+    property Component columnForeground
+
+    /*!
+        This property holds the visibility of this column.
+    */
+    property bool visible: true
+
+    /*!
+        This read-only property indicates whether the item has active focus.
+
+        See Item's \l {Item::activeFocus}{activeFocus} property for more
+        information.
+    */
+    readonly property bool activeFocus: {
+        if (__tumbler === null)
+            return null;
+
+        var view = __tumbler.__viewAt(__index);
+        return view && view.activeFocus ? true : false;
+    }
+
+    /*!
+        This property holds the width of this column.
+    */
+    property real width: TextSingleton.implicitHeight * 4
+}