How to retrieve map scale using ArcGIS for QML/QT? - qt

Question

I am building a simple QML application that makes use of the ArcGIS SDK, the purpose right now is just to learn the SDK features.
What I'd like to do is have a zoomable map and a text box that displays the current map scale. Below is the code I have written for this, based upon the samples on the ArcGIS website.
import QtQuick 2.6
import QtQuick.Controls 1.4
import Esri.ArcGISRuntime 100.1
ApplicationWindow {
id: appWindow
width: 800
height: 600
title: "Untitled"
MapView {
id: mainmapview
attributionTextVisible: false
anchors.topMargin: 0
anchors.rightMargin: 0
anchors.fill: parent
focus: true
Map {
id: mainmap
BasemapLightGrayCanvasVector {}
}
onMapScaleChanged: scaletext.text=mainmapview.scale.toString()
Text {
id: scaletext
x: 10
y: 10
width: 285
height: 45
text: qsTr("Text")
font.pixelSize: 12
}
}
}
The map loads and I can see it OK, but the scale textbox doesn't work: it always shows the scale as '1', no matter how much I zoom in or out. Obviously this isn't correct. Am I messing up the type conversion to text?
Any pointers as to how to resolve this would be great. Thanks.

Answer 1

Actually I figured it out myself. This line:
onMapScaleChanged: scaletext.text=mainmapview.scale.toString()
Should be:
onMapScaleChanged: scaletext.text=mainmapview.mapScale.toString()
Rather than delete the question I've answered it in case anyone else has the same problem and can find this through google.