Show callout

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Sample viewer app

Show a callout with the latitude and longitude of user-tapped points.

screenshot

Use case

Callouts are used to display temporary detail content on a map. You can display text and arbitrary UI controls in callouts.

How to use the sample

Tap anywhere on the map. A callout showing the WGS84 coordinates for the tapped point will appear.

How it works

  1. Listen for mouseClicked signal on the map view.
  2. When the user taps, get the tapped location using the mouseEvent x and y coordinates, MapQuickView.screenToLocation(mouse.x, mouse.y).
  3. Create a string to display the coordinates; note that latitude and longitude in WGS84 map to the Y and X coordinates.
  4. Create a new callout definition using a title and the coordinate string.
  5. Display the callout by setting thelocation property of the CalloutData and calling showCallout.

Relevant API

  • CalloutDefinition
  • GeometryEngine.project
  • MapView.onMouseClicked

Tags

balloon, bubble, callout, flyout, flyover, info window, popup, tap

Sample Code

ShowCallout.qml
                                                                                   
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// [WriteFile Name=ShowCallout, Category=DisplayInformation]
// [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.ArcGISExtras 1.1
import Esri.ArcGISRuntime 100.12
import Esri.ArcGISRuntime.Toolkit 100.12

Rectangle {
    clip: true
    width: 800
    height: 600

    property Point calloutLocation
    property real xCoor
    property real yCoor

    // Map view UI presentation at top
    MapView {
        id: mapView
        anchors.fill: parent
        clip: true

        Map {
            Basemap {
                initStyle: Enums.BasemapStyleArcGISTopographic
            }

            // initial Viewpoint
            ViewpointCenter {
                Point {
                    x: -1.2e7
                    y: 5e6
                    spatialReference: SpatialReference { wkid: 3857 }
                }
                targetScale: 1e7
            }
        }

        //! [show callout qml api snippet]
        // initialize Callout
        calloutData {
            imageUrl: "qrc:/Samples/DisplayInformation/ShowCallout/RedShinyPin.png"
            title: "Location"
            location: calloutLocation
            detail: "x: " + xCoor + " y: " + yCoor
        }

        Callout {
            id: callout
            calloutData: parent.calloutData
            leaderPosition: leaderPositionEnum.Automatic
        }
        //! [show callout qml api snippet]

        // display callout on mouseClicked
        onMouseClicked: {
            if (callout.calloutVisible)
                callout.dismiss()
            else
            {
                calloutLocation = mouse.mapPoint;
                xCoor = mouse.mapPoint.x.toFixed(2);
                yCoor = mouse.mapPoint.y.toFixed(2);
                callout.accessoryButtonHidden = true;
                callout.showCallout();
            }
        }
    }
}

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