Qt 4.8: ScrollBar.qml Example File (demos/declarative/rssnews/qml/rssnews/content/ScrollBar.qml)

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# ScrollBar.qml Example File

demos/declarative/rssnews/qml/rssnews/content/ScrollBar.qml

     /****************************************************************************
     **
     ** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the QtDeclarative module of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** 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 Digia.  For licensing terms and
     ** conditions see http://qt.digia.com/licensing.  For further information
     ** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.LGPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU Lesser General Public License version 2.1 requirements
     ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
     **
     ** In addition, as a special exception, Digia gives you certain additional
     ** rights.  These rights are described in the Digia Qt LGPL Exception
     ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 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 3.0 requirements will be
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     ****************************************************************************/

     import QtQuick 1.0

     Item {
         id: container

         property variant scrollArea
         property variant orientation: Qt.Vertical

         opacity: 0

         function position()
         {
             var ny = 0;
             if (container.orientation == Qt.Vertical)
                 ny = scrollArea.visibleArea.yPosition * container.height;
             else
                 ny = scrollArea.visibleArea.xPosition * container.width;
             if (ny > 2) return ny; else return 2;
         }

         function size()
         {
             var nh, ny;

             if (container.orientation == Qt.Vertical)
                 nh = scrollArea.visibleArea.heightRatio * container.height;
             else
                 nh = scrollArea.visibleArea.widthRatio * container.width;

             if (container.orientation == Qt.Vertical)
                 ny = scrollArea.visibleArea.yPosition * container.height;
             else
                 ny = scrollArea.visibleArea.xPosition * container.width;

             if (ny > 3) {
                 var t;
                 if (container.orientation == Qt.Vertical)
                     t = Math.ceil(container.height - 3 - ny);
                 else
                     t = Math.ceil(container.width - 3 - ny);
                 if (nh > t) return t; else return nh;
             } else return nh + ny;
         }

         Rectangle { anchors.fill: parent; color: "Black"; opacity: 0.3 }

         BorderImage {
             source: "images/scrollbar.png"
             border { left: 1; right: 1; top: 1; bottom: 1 }
             x: container.orientation == Qt.Vertical ? 2 : position()
             width: container.orientation == Qt.Vertical ? container.width - 4 : size()
             y: container.orientation == Qt.Vertical ? position() : 2
             height: container.orientation == Qt.Vertical ? size() : container.height - 4
         }

         states: State {
             name: "visible"
             when: container.orientation == Qt.Vertical ? scrollArea.movingVertically : scrollArea.movingHorizontally
             PropertyChanges { target: container; opacity: 1.0 }
         }

         transitions: Transition {
             from: "visible"; to: ""
             NumberAnimation { properties: "opacity"; duration: 600 }
         }
     }