Qt 4.8: ToggleButton.qml Example File (demos/mobile/guitartuner/src/mycomponents/ToggleButton.qml)

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# ToggleButton.qml Example File

demos/mobile/guitartuner/src/mycomponents/ToggleButton.qml

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the QtDeclarative module of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
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     **   * Redistributions in binary form must reproduce the above copyright
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     **     the documentation and/or other materials provided with the
     **     distribution.
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     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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     import QtQuick 1.0

     /* A toggle button component. */
     Rectangle {
         id: toggleButton

         property url offImageSource: ""
         property url onImageSource: ""
         property alias imageSource: buttonImage.source

         signal selected()
         signal pushed()

         color: "transparent"
         state: "unPressed"
         onStateChanged: {
             if (state == "pressed") {
                 selected()
             }
         }

         Image {
             id: buttonImage

             smooth: true
             anchors.fill: parent
         }
         MouseArea {
             id: mouseArea

             anchors.fill: parent
             onPressed: {
                 if (parent.state == "unPressed") {
                     pushed()
                 }
             }
         }

         states: [
             State {
                 name: "pressed"
                 PropertyChanges {
                     target: toggleButton
                     scale: 0.95
                     imageSource: onImageSource
                 }
             },
             State {
                 name: "unPressed"
                 PropertyChanges {
                     target: toggleButton
                     scale: 1/0.95
                     imageSource: offImageSource
                 }
             }
         ]

         transitions: [
             Transition {
                 from: "unPressed"
                 to: "pressed"
                 reversible: true
                 PropertyAnimation {
                     target: toggleButton
                     properties: "scale"
                     duration: 100
                 }
             }
         ]
     }