Map loaded

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Sample viewer app

Determine the map's load status which can be: NotLoaded, FailedToLoad, Loading, Loaded, Unknown.

screenshot

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

  1. Create a Map and add it to a MapView.
  2. Connect to the Map::loadStatusChanged signal to query the map's load status. The LoadStatus is LoadStatus::Loaded when any of the following criteria are met:
  3. The map has a valid spatial reference.
  4. The map has an an initial viewpoint.
  5. One of the map's predefined layers has been created.

Relevant API

  • Map
  • LoadStatusChanged
  • MapView

Tags

LoadStatus, Map, Loadable pattern

Sample Code

MapLoaded.qmlMapLoaded.cppMapLoaded.h
                                                        
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// [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.Samples 1.0

MapLoadedSample {
    id: mapLoadedSample
    width: 800
    height: 600

    // add a mapView component
    MapView {
        anchors.fill: parent
        objectName: "mapView"
    }

    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
            }
            // Bind to the C++ property that returns the map's load status
            text: mapLoadedSample.mapLoadStatus
            font.pixelSize: 14
        }
    }
}

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