Qt 4.8: adjustbars.js Example File (demos/mobile/guitartuner/src/mycomponents/adjustbars.js)

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# adjustbars.js Example File

demos/mobile/guitartuner/src/mycomponents/adjustbars.js

     /****************************************************************************
     **
     ** 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
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     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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     /* JavaScript functions for creating, handling and
      * destroying the bars of the adjuster component. */

     var maxBars = 10;
     var firstBarHeight = 5;
     var bars = new Array(maxBars);
     var colors = new Array(maxBars);
     var barWidthFactor = 2.3;

     function createBars() {
         var barWidth = adjuster.width/maxBars/barWidthFactor;
         for (var i = 1; i <= maxBars; i++) {
             //Create, configure and store the bars.
             var bar = Qt.createQmlObject('import QtQuick 1.0; Rectangle {smooth: true}', adjuster, "dynamicBar");
             bar.width = barWidth;
             bar.height = firstBarHeight+(i/maxBars)*(adjuster.height*0.8-firstBarHeight);
             bar.radius = bar.width/2;
             bar.x = (i-1)*(barWidthFactor*barWidth);
             bar.y = adjuster.height/2 - bar.height/2;
             bars[i-1] = bar;

             //Calculate and store the colors
             if (i < maxBars/2) {
                 colors[i-1] = Qt.rgba(1-i/(maxBars/2), 1, 1-i/(maxBars/2), i);
             }
             else {
                 colors[i-1] = Qt.rgba((i-(maxBars/2))/(maxBars/2), 1-((i-(maxBars/2))/(maxBars/2)), 0, i);
             }
         }
     }

     function destroyBars() {
         for (var i = 0; i < maxBars; i++) {
             bars[i].color = "transparent" //Colors must be set to transparent or otherwise the bars will stay appeared.
             bars[i].destroy();
         }
     }

     function fillBars(barNumber) {
         //Set the color for the bars (transparent from the selected bar to the end).
         for (var i = 0; i < maxBars; i++) {
             if (i < barNumber) {
                 bars[i].color = colors[i];
             }
             else {
                 bars[i].color = "black";
             }
         }
     }