Qt Reference Documentation

# adjustbars.js Example File

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

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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";
             }
         }
     }