Determine the map's load status which can be: NotLoaded
, FailedToLoad
, Loading
, Loaded
, Unknown
.
Use case
Knowing the map's load state may be required before subsequent actions can be executed.
How to use the sample
Click on the button to reload the Map. The load status of the Map will be displayed on screen.
How it works
- Create a
Map
and add it to aMapView
. - Connect to the
Map
'sonloadStatusChanged
signal to query the map's load status. TheloadStatus
isEnums.LoadStatusLoaded
when any of the following criteria are met:
- The map has a valid spatial reference.
- The map has an an initial viewpoint.
- One of the map's predefined layers has been created.
Relevant API
- Map
- LoadStatusChanged
- MapView
Tags
LoadStatus, Map, Loadable pattern
Sample Code
// [WriteFile Name=MapLoaded, Category=Maps]
// [Legal]
// Copyright 2016 Esri.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [Legal]
import QtQuick 2.6
import Esri.ArcGISRuntime 100.15
Rectangle {
width: 800
height: 600
property string statusText
// Create MapView that contains a Map
MapView {
anchors {
left: parent.left
right: parent.right
top: parent.top
bottom: statusBar.top
}
Component.onCompleted: {
// Set the focus on MapView to initially enable keyboard navigation
forceActiveFocus();
}
Map {
// Set the initial basemap to Streets
Basemap {
initStyle: Enums.BasemapStyleArcGISStreets
}
// Set up signal handler to determine load status
// Load status should be loaded once the basemap successfully loads
onLoadStatusChanged: {
switch (loadStatus) {
case Enums.LoadStatusFailedToLoad:
statusText = "Failed to Load";
break;
case Enums.LoadStatusLoaded:
statusText = "Loaded";
break;
case Enums.LoadStatusLoading:
statusText = "Loading...";
break;
case Enums.LoadStatusNotLoaded:
statusText = "Not Loaded";
break;
case Enums.LoadStatusUnknown:
statusText = "Unknown";
break;
default:
statusText = "Unknown";
break;
}
}
}
}
Rectangle {
id: statusBar
anchors {
left: parent.left
right: parent.right
bottom: parent.bottom
}
height: 30
color: "lightgrey"
border {
width: 0.5
color: "black"
}
Text {
anchors {
verticalCenter: parent.verticalCenter
left: parent.left
leftMargin: 10
}
text: "Map Load Status: %1".arg(statusText)
font.pixelSize: 14
}
}
}