Qt Reference Documentation

# ScrollBar.qml Example File

demos/declarative/rssnews/content/ScrollBar.qml

     /****************************************************************************
     **
     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the QtDeclarative module of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** GNU Lesser General Public License Usage
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     ** file. Please review the following information to ensure the GNU Lesser
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     ** rights. These rights are described in the Nokia Qt LGPL Exception
     ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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     ** GNU General Public License Usage
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     ** Public License version 3.0 as published by the Free Software Foundation
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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 }
         }
     }