Adjuster.qml Example File

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 import QtQuick 1.0
 import "adjustbars.js" as AdjustBars

 /* A barchart-like adjuster component. */
 Rectangle {
     id: adjuster

     property real max: 100
     property real value: 0
     property bool created: false

     signal valueChanged(real value)
     signal focusChangedByClick()
     signal arrowPressedWhenValueOverLimits()

     function setValue(pValue) {
         value = pValue;
         AdjustBars.fillBars(value/max*AdjustBars.maxBars);
         valueChanged(value);
     }

     height: 60; width: 300
     color: "transparent"
     Keys.onRightPressed: {
         var val = value+max/AdjustBars.maxBars;
         if (val <= max) {
             value = val;
             AdjustBars.fillBars(value/max*AdjustBars.maxBars);
             valueChanged(value);
         }
         else {
             arrowPressedWhenValueOverLimits()
         }
     }
     Keys.onLeftPressed: {
         var val = value-max/AdjustBars.maxBars;
         if (0 <= val) {
             value = val;
             AdjustBars.fillBars(value/max*AdjustBars.maxBars);
             valueChanged(value);
         }
         else {
             arrowPressedWhenValueOverLimits()
         }
     }
     Component.onCompleted: {
         AdjustBars.createBars();
         AdjustBars.fillBars(value/max*AdjustBars.maxBars);
         created = true;
     }
     Component.onDestruction: {
         AdjustBars.destroyBars;
     }
     //Dynamic objects have to be recreated when the window size changes.
     onWidthChanged: {
         if (created) {
             AdjustBars.destroyBars();
             AdjustBars.createBars();
             AdjustBars.fillBars(value/max*AdjustBars.maxBars);
         }
     }
     onHeightChanged: {
         if (created) {
             AdjustBars.destroyBars();
             AdjustBars.createBars();
             AdjustBars.fillBars(value/max*AdjustBars.maxBars);
         }
     }

     MouseArea {
         anchors.fill: parent
         onPositionChanged: {
             focusChangedByClick();
             var val = mouse.x/parent.width*parent.max;
             if (0 < val && val < max) {
                 parent.value = val;
                 AdjustBars.fillBars(parent.value/parent.max*AdjustBars.maxBars);
                 valueChanged(parent.value);
             }
         }
         onClicked: {
             focusChangedByClick();
             var val = mouse.x/parent.width*parent.max;
             if (0 < val && val < max) {
                 parent.value = val;
                 AdjustBars.fillBars(parent.value/parent.max*AdjustBars.maxBars);
                 valueChanged(parent.value);
             }
         }
     }
 }