Qt 4.8: Slider.qml Example File (demos/declarative/flickr/qml/flickr/common/Slider.qml)

Qt Reference Documentation

# Slider.qml Example File

demos/declarative/flickr/qml/flickr/common/Slider.qml

     /****************************************************************************
     **
     ** Copyright (C) 2012 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
     ** 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.
     **
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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.
     **
     ** 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
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     import QtQuick 1.0

     Item {
         id: slider; width: 400; height: 16

         // value is read/write.
         property real value: 1
         onValueChanged: updatePos();
         property real maximum: 1
         property real minimum: 1
         property int xMax: width - handle.width - 4
         onXMaxChanged: updatePos();
         onMinimumChanged: updatePos();

         function updatePos() {
             if (maximum > minimum) {
                 var pos = 2 + (value - minimum) * slider.xMax / (maximum - minimum);
                 pos = Math.min(pos, width - handle.width - 2);
                 pos = Math.max(pos, 2);
                 handle.x = pos;
             } else {
                 handle.x = 2;
             }
         }

         Rectangle {
             anchors.fill: parent
             border.color: "white"; border.width: 0; radius: 8
             gradient: Gradient {
                 GradientStop { position: 0.0; color: "#66343434" }
                 GradientStop { position: 1.0; color: "#66000000" }
             }
         }

         Rectangle {
             id: handle; smooth: true
             y: 2; width: 30; height: slider.height-4; radius: 6
             gradient: Gradient {
                 GradientStop { position: 0.0; color: "lightgray" }
                 GradientStop { position: 1.0; color: "gray" }
             }

             MouseArea {
                 id: mouse
                 anchors.fill: parent; drag.target: parent
                 drag.axis: Drag.XAxis; drag.minimumX: 2; drag.maximumX: slider.xMax+2
                 onPositionChanged: { value = (maximum - minimum) * (handle.x-2) / slider.xMax + minimum; }
             }
         }
     }